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features description applications TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 2.25 mhz 600 ma step down converter in 2x2son/tsot-23 package high efficiency step down converter the TPS62260 device is a high efficient synchronous step down dc-dc converter optimized for battery output current up to 600 ma powered applications. it provides up to 600-ma wide v in range from 2 v to 6 v for li-ion output current from a single li-ion cell and is ideal to batteries with extended voltage range power mobile phones and other portable 2.25 mhz fixed frequency operation applications. power save mode at light load currents with an wide input voltage range of 2 v to 6 v, the output voltage accuracy in pwm mode 1.5% device supports applications powered by li-ion batteries with extended voltage range, two and three typ. 15 m a quiescent current cell alkaline batteries, 3.3 v and 5 v input voltage 100% duty cycle for lowest dropout rails. soft start the TPS62260 operates at 2.25 mhz fixed switching voltage positioning at light loads frequency and enters power save mode operation at available in a small 2 2 0,8mm son and light load currents to maintain high efficiency over tsot-23 package the entire load current range. allows <1mm solution height the power save mode is optimized for low output voltage ripple. for low noise applications, the device can be forced into fixed frequency pwm mode by pulling the mode pin high. in the shutdown mode, pdas, pocket pcs the current consumption is reduced to less than 1 m a. low power dsp supply TPS62260 allows the use of small inductors and portable media players capacitors to achieve a small solution size. pol applications the TPS62260 is available in a very small 2 2 6 pin son and tsot-23 5 pin package. please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. powerpad is a trademark of texas instruments. production data information is current as of publication date. copyright ? 2007, texas instruments incorporated products conform to specifications per the terms of the texas instruments standard warranty. production processing does not necessarily include testing of all parameters. www.ti.com v in gnd en fb sw TPS62260drv l r 1 r 2 c 10 f out m v out mode c 4.7 f in m 2.2 h m c22 pf 1 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 i - output current - ma o efficiency - % v = 2.3 v in v = 2.7 v in v = 3 v in v = 3.6 v in v = 4.5 v in v = 1.8 v, mode = gnd, l = 2.2 h, dcr 110 mr out m
absolute maximum ratings dissipation ratings recommended operating conditions TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 this integrated circuit can be damaged by esd. texas instruments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ordering information part output package package t a package (3) ordering number (1) voltage (2) designator marking son 2x2-6 drv TPS62260drv byk TPS62260 adjustable tsot-23 5 ddc TPS62260ddc byp ?40 c to 85 c tps62261 1.8v fix son 2x2-6 drv tps62261drv byl tps62262 1.2v fix son 2x2-6 drv tps62262drv bym (1) the drv (2x2-6 son) and ddc (tsot-23-5) packages are available in tape on reel. add r suffix to order quantities of 3000 parts per reel. (2) contact ti for other fixed output voltage options (3) for the most current package and ordering information, see the package option addendum at the end of this document, or see the ti website at www.ti.com . over operating free-air temperature range (unless otherwise noted) (1) value unit input voltage range (2) ?0.3 to 7 v voltage range at en, mode ?0.3 to v in +0.3, 7 v voltage on sw ?0.3 to 7 v peak output current internally limited a hbm human body model 2 kv esd rating (3) cdm charge device model 1 machine model 200 v maximum operating junction temperature t j ?40 to 125 c t stg storage temperature range ?65 to 150 c (1) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) all voltage values are with respect to network ground terminal. (3) the human body model is a 100-pf capacitor discharged through a 1.5-k w resistor into each pin. the machine model is a 200-pf capacitor discharged directly into each pin. package r q ja power rating for t a 25 c derating factor above t a = 25 c drv 76 c/w 1300 mw 13 mw/ c ddc 250/ c 400 mw 4 mw/ c min nom max unit v in supply voltage 2 6 v output voltage range for adjustable voltage 0.6 vin v t a operating ambient temperature ?40 85 c t j operating junction temperature ?40 125 c 2 submit documentation feedback www.ti.com
electrical characteristics TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 over full operating ambient temperature range, typical values are at t a = 25 c. unless otherwise noted, specifications apply for condition v in = en = 3.6v. external components c in = 4.7 m f 0603, c out = 10 m f 0603, l = 2.2 m h, see the parameter measurement information. parameter test conditions min typ max unit supply v in input voltage range 2.3 6 v v in 2.5 v to 6 v 600 i out output current v in 2.3 v to 2.5 v 300 ma v in 2 v to 2.3 v 150 i out = 0 ma, pfm mode enabled 15 (mode = gnd) device not switching m a i out = 0 ma, pfm mode enabled (mode = gnd) device switching, v out = 1.8 v, 18.5 i q operating quiescent current see (1) i out = 0 ma, switching with no load (mode = v in ), pwm operation, v out = 1.8 v, 3.8 ma v in = 3 v i sd shutdown current en = gnd 0.1 1 m a falling 1.85 uvlo undervoltage lockout threshold v rising 1.95 enable, mode high level input voltage, en, 2 v v in 6 v 1 vin v ih v mode low level input voltage, en, 2 v v in 6 v 0 0.4 v il v mode i in input bias current, en, mode en, mode = gnd or vin 0.01 1 m a power switch high side mosfet on-resistance 240 480 r ds(on) v in = v gs = 3.6 v, t a = 25 c m w low side mosfet on-resistance 185 380 forward current limit mosfet i limf v in = v gs = 3.6 v 0.8 1 1.2 a high-side and low side thermal shutdown increasing junction temperature 140 t sd c thermal shutdown hysteresis decreasing junction temperature 20 oscillator f sw oscillator frequency 2 v v in 6 v 2 2.25 2.5 mhz output v out adjustable output voltage range 0.6 v in v v ref reference voltage 600 mv mode = v in , pwm operation, for fixed output feedback voltage pwm mode voltage versions v fb = v out , ?1.5% 0% 1.5% 2.5 v v in 6 v, 0 ma i out 600 ma, see (2) v fb mode = gnd, device in pfm mode, voltage feedback voltage pfm mode 1% positioning active, see (1) load regulation pwm mode -0.5 %/a time from active en to reach 95% of v out 500 t start up start-up time m s nominal t ramp v out ramp up time time to ramp from 5% to 95% of v out 250 m s v in = 3.6 v, v in = v out = v sw , en = gnd, i lkg leakage current into sw pin 0.1 1 m a see (3) (1) in pfm mode, the internal reference voltage is set to typ. 1.01 v ref . see the parameter measurement information. (2) for v in = v o + 0.6 v (3) in fixed output voltage versions, the internal resistor divider network is disconnected from fb pin. 3 submit documentation feedback www.ti.com
pin assignments functional block diagram TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 terminal functions terminal no. i/o description no. name son tsot23-5 2x2-6 v in 5 1 pwr vin power supply pin. gnd 6 2 pwr gnd supply pin this is the enable pin of the device. pulling this pin to low forces the device into shutdown en 4 3 i mode. pulling this pin to high enables the device. this pin must be terminated. this is the switch pin and is connected to the internal mosfet switches. connect the sw 1 4 out external inductor between this terminal and the output capacitor. feedback pin for the internal regulation loop. connect the external resistor divider to this pin. fb 3 5 i in case of fixed output voltage option, connect this pin directly to the output capacitor this pin is only available at son package option. mode pin = high forces the device to mode 2 i operate in fixed frequency pwm mode. mode pin = low enables the power save mode with automatic transition from pfm mode to fixed frequency pwm mode. 4 submit documentation feedback v i gnd en swfb 12 3 54 ddc package (top view) drv package (top view) mode fb gnd sw en vin 1 23 6 54 r p ow e pa d zero-pole amp. integrator error amp . pfm comp. +1% voltage positioning pwm comp. vref controlstage gate driver anti shoot-through currentlimit comparator currentlimit comparator vref +1% fb fb vin gnd mode 2.25 mhz oscillator sw1 en vin softstart vout ramp control thermal shutdown reference 0.6v vref undervoltage lockout 1.8v limithigh side limitlow side sawtoothgenerator int. resistor network fb ri3 ri 1 ri..n mode only in 2x2son gnd www.ti.com
parameter measurement information typical characteristics TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 table of graphs figure output current v out = 1.8 v, power save mode, mode = figure 1 gnd output current v out = 1.8 v, pwm mode, mode = v in figure 2 output current v out = 3.3 v, pwm mode, mode = v in figure 3 h efficiency output current v out = 3.3 v, power save mode, figure 4 mode = gnd output current figure 5 output current figure 6 at 25 c, v out = 1.8 v, power save mode, mode = gnd figure 7 at ?40 c, v out = 1.8 v, power save mode, mode = gnd figure 8 at 85 c, v out = 1.8 v, power save mode, mode = gnd figure 9 output voltage accuracy at 25 c, v out = 1.8 v, pwm mode, mode = v in figure 10 at ?40 c, v out = 1.8 v, pwm mode, mode = v in figure 11 at 85 c, v out = 1.8 v, pwm mode, mode = v in figure 12 typical operation pwm mode, v out = 1.8 v figure 13 mode pin transition from pfm to forced pwm mode at figure 14 light load mode transition mode pin transition from forced pwm to pfm mode at figure 15 light load start-up timing figure 16 forced pwm mode , v out = 1.5 v, 50 ma to 200 ma figure 17 forced pwm mode , v out = 1.5 v, 200 ma to 400 ma figure 18 pfm mode to pwm mode, v out = 1.5 v, 150 m a to 400 ma figure 19 pwm mode to pfm mode, v out = 1.5 v, 400 ma to 150 m a figure 20 load transient pfm mode, v out = 1.5 v, 1.5 ma to 50 ma figure 21 pfm mode, v out = 1.5 v, 50 ma to 1.5 ma figure 22 pfm mode to pwm mode, v out = 1.8 v, 50 ma to 250 ma figure 23 pfm mode to pwm mode, v out = 1.5 v, 50 ma to 400 ma figure 24 pwm mode to pfm mode, v out = 1.5 v, 400 ma to 50 ma figure 25 pfm mode, v out = 1.8 v, 50 ma figure 26 line transient pfm mode, v out = 1.8 v, 250 ma figure 27 5 submit documentation feedback v in gnd en fb sw TPS62260dvr r 1 r 2 v out mode c 4.7 f in m l 2.2 h m c22 pf 1 c 10 f out m l: lps3015 2.2 h, 110 c grm188r60j475k 4.7 f murata 0603 size c m mw m in out grm188r60j106m 10 f murata 0603 size m www.ti.com
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 typical characteristics (continued) table of graphs (continued) figure pfm v out ripple, v out = 1.8 v, 10 ma, l = 2.2 m h, c out = figure 28 10 m f typical operation pfm v out ripple, v out = 1.8 v, 10 ma, l = 4.7 m h, c out = figure 29 10 m f shutdown current into vin vs input voltage, (t a = 85 c, t a = 25 c, t a = -40 c) figure 30 quiescent current vs input voltage, (t a = 85 c, t a = 25 c, t a = -40 c) figure 31 figure 32 static drain source on-state vs input voltage, (t a = 85 c, t a = 25 c, t a = -40 c) resistance figure 33 efficiency (power save mode) efficiency (pwm mode) vs vs output current output current figure 1. figure 2. 6 submit documentation feedback 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 i - output current - ma o h - efficiency - % v = 2.3 v in v = 2.7 v in v = 3 v in v = 3.6 v in v = 4.5 v in v = 1.8 v, mode = v , l = 2.2 h out in m 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 i - output current - ma o efficiency - % v = 2.3 v in v = 3.6 v in v = 4.5 v in v = 1.8 v, mode = gnd, l = 2.2 h, dcr 110 mr out m v = 3 v in v = 2.7 v in www.ti.com
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 efficiency (pwm mode) efficiency (power save mode) vs vs output current output current figure 3. figure 4. efficiency efficiency vs vs output current output current figure 5. figure 6. 7 submit documentation feedback i ? output current ? ma o 0 10 20 30 40 90 100 0.001 0.01 0.1 1 efficiency ? % 50 60 v = 2.3 v i v = 2.3 v i v = 2.7 v i v = 3.6 v i v = 4.5 v i v = 1.2 v , mode = v , l = 2 h, mipsa2520 c = 10 f 0603 o i o m m 70 80 i ? output current ? ma o 0 10 20 30 40 90 100 0.0001 0.001 0.1 1 efficiency ? % 50 60 v = 2.3 v i v = 2.7 v i v = 3.6 v i v = 4.5 v i v = 1.2 v , mode = gnd, l = 2 h, mipsa2520 c = 10 f 0603 o o m m 70 80 0.01 0.01 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 i - output current - ma o v = 3.3 v, mode = v , l = 2.2 h, dcr 110 m c = 10 f 0603 out in o m w, m h - efficiency - % v = 3.6 v in v = 4.2 v in v = 4.5 v in v = 5 v in 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 i - output current - ma o h - efficiency - % 100 v = 5 v in v = 3.6 v in v = 4.5 v in v = 3.3 v, mode = gnd, l = 2.2 h, dcr 110 m , c = 10 f 0603 out o m w m v = 4.2 v in www.ti.com
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 output voltage accuracy output voltage accuracy (power save mode) vs vs output current output current figure 7. figure 8. output voltage accuracy (power save mode) output voltage accuracy (pwm mode) vs vs output current output current figure 9. figure 10. 8 submit documentation feedback 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 pfm mode, voltage positioning v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o pwm mode v = 2.3 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = 25c, v = 1.8 v, mode = gnd, l = 2.2 h, c = 10 f a out o m m 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o pwm mode v = 2.3 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = -40c, v = 1.8 v, mode = gnd, l = 2.2 h, c = 10 f a out o m m pfm mode, voltage positioning www.ti.com 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o pwm mode v = 2 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = 85c, v = 1.8 v, mode = gnd, l = 2.2 h, c = 10 f a out o m m pfm mode, voltage positioning 1.746 1.764 1.782 1.8 1.818 1.836 1.854 v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o v = 2.3 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = 25c, v = 1.8 v, mode = v , l = 2.2 h a out in m
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 output voltage accuracy (pwm mode) output voltage accuracy (pwm mode) vs vs output current output current figure 11. figure 12. mode pin transition from pfm typical operation (pwm mode) to forced pwm mode at light load figure 13. figure 14. 9 submit documentation feedback time base - 10 s/div m v 3.6v v 1.8v, i 150ma l 2.2 h, c 10 f 0603 in out out out m m v 10 mv/div out sw 2 v/div i coil 200 ma/div time base - 1 s/div m mode2v/div sw2v/div i200ma/div coil v = 3.6 v v = 1.8 v i = 10 ma in out out pfm mode forced pwm mode 1.746 1.764 1.782 1.8 1.818 1.836 1.854 v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o v = 2.3 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = 85c, v = 1.8 v, mode = v , l = 2.2 h a out in m 1.746 1.764 1.782 1.8 1.818 1.836 1.854 v - output voltage dc - v o 0.01 0.1 1 10 100 1000 i - output current - ma o v = 2 v in v = 2.7 v v = 3 v v = 3.6 v v = 4.5 v in in in in t = -40c, v = 1.8 v, mode = v , l = 2.2 h a out in m www.ti.com
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 mode pin transition from pwm to pfm mode at light load start-up timing figure 15. figure 16. load transient load transient (forced pwm mode) (forced pwm mode) figure 17. figure 18. 10 submit documentation feedback www.ti.com time base - 2.5 s/div m mode2 v/div sw2 v/div i coil 200 ma/div v = 3.6 v v = 1.8 v i = 10 ma in out out pfm mode forced pwm mode en2v/div sw2v/div v 2v/div out i 100ma/div in v =3.6v r =10 v =1.8v i intoc mode=gnd in load out in in timebase100 s/div m time base - 20 s/div m v 3.6 v v 1.5 v i 50 ma to 200 ma mode = in out out v in i 200 ma/div out v 50 mv/div out i coil 500 ma/div time base - 20 s/div m v 3.6 v v 1.5 v i 200 ma to in out out i 200 ma/div out v 50 mv/div out i coil 500 ma/div 200 ma 400 ma
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 load transient load transient (forced pfm mode to pwm mode) (forced pwm mode to pfm mode) figure 19. figure 20. load transient (pfm mode) load transient (pfm mode) figure 21. figure 22. 11 submit documentation feedback www.ti.com vv i in out out 3.6 v 1.5 v 150 a to 400 ma mode = gnd m v out 50mv/div i coil l 500ma/div time base - 500 m s/div sw 2 v/div i out 500 ma/div 150 a m 400 ma v 3.6 v v 1.5 v i 150 a to 400 ma mode = gnd in out out m v 50 mv/div out i 500 ma/div coil time base - 500 m s/div sw 2 v/div i 500 ma/div out 150 a m 400 ma v 3.6 v v 1.5 v i 50 ma to mode = gnd in out out 1.5ma v 50mv/div out i 500 ma/div coil time base - 50 m s/div sw 2v/div i 50 ma/div out 1.5 ma 50 ma v 3.6 v v 1.5 v i mode = gnd in out out 1.5 ma to 50 ma v 50 mv/div out i coil 500 ma/div time base - 50 m s/div sw 2 v/div i 50 ma/div out 1.5 ma 50 ma
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 load transient load transient (pfm mode to pwm mode) (pfm mode to pwm mode) figure 23. figure 24. load transient (pwm mode to pfm mode) line transient (pfm mode) figure 25. figure 26. 12 submit documentation feedback www.ti.com v in 3.6v to 4.2v 500 mv/div v = 1.8 v 50 mv/div i = 50 ma mode = gnd out out time base - 100 s/div m v 3.6 v v 1.5 v i 50 mode = gnd in out out ma to 400 ma v 50 mv/div out i 500 ma/div coil time base - 20 m s/div sw 2 v/div i 500 ma/div out 50 ma 400 ma pfm mode pwm mode v 3.6 v v 1.5 v i 50 mode = gnd in out out ma to 400 ma v 50 mv/div out i 500ma/div coil time base - 20 m s/div sw 2 v/div i 500 ma/div out 50 ma 400 ma pfm mode pwm mode v 3.6 v v 1.8 v i 50 mode = gnd in out out ma to 250 ma v 50 mv/div out i 500 ma/div coil time base - 20 m s/div sw 2 v/div i 200 ma/div out 50 ma 250 ma
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 line transient (pwm mode) typical operation (pfm mode) figure 27. figure 28. shutdown current into vin vs typical operation (pfm mode) input voltage figure 29. figure 30. 13 submit documentation feedback www.ti.com v 3.6v to 4.2v 500 mv/div in v = 1.8 v 50 mv/div i = 250 ma mode = gnd out out time base - 100 s/div m time base - 10 s/div m v 3.6 v v 1.8 v, i 10 ma l 2.2 h, c 10 f in out out out m m v 20 mv/div out sw 2 v/div i 200 ma/div coil v ? input v oltage ? v i n 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 2 2.5 3 3.5 4 4.5 5 5.5 6 i - shutdown current into vin ? a sd m t = 85 c a o t = -40 c a o en = gnd t = 25 c a o v 3.6 v; v 1.8 v, i 10 mode = gnd in out out ma, l = 4.7 h, c = 10 f 0603, m m out v 20 mv/div out i 200 ma/div coil time base - 2 m s/div sw 2 v/div
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 quiescent current static drain-source on-state resistance vs vs input voltage input voltage figure 31. figure 32. static drain-source on-state resistance vs input voltage figure 33. 14 submit documentation feedback www.ti.com v ? input v oltage ? v i n 0 0.1 0.2 0.3 0.4 0.7 0.8 2 2.5 3 3.5 4 4.5 5 r - static drain-source on-state resistance ? d s(o n ) w t = 85 c a o t = -40 c a o high side switching t = 25 c a o 0.5 0.6 v ? input v oltage ? v i n 8 10 12 14 16 18 20 2 2.5 3 3.5 4 4.5 5 5.5 6 i - quiescent current ? a q m t = 85 c a o t = -40 c a o mode = gnd, en = vin, devise not switching t = 25 c a o v ? input v oltage ? v i n 0 0.05 0.1 0.15 0.2 0.35 0.4 2 2.5 3 3.5 4 4.5 5 r - static drain-source on-state resistance ? d s(o n ) w t = 85 c a o t = -40 c a o low side switching t = 25 c a o 0.25 0.3
detailed description operation power save mode dynamic voltage positioning TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 the TPS62260 step down converter operates with typically 2.25 mhz fixed frequency pulse width modulation (pwm) at moderate to heavy load currents. at light load currents the converter can automatically enter power save mode and operates then in pfm mode. during pwm operation the converter use a unique fast response voltage mode control scheme with input voltage feed-forward to achieve good line and load regulation allowing the use of small ceramic input and output capacitors. at the beginning of each clock cycle initiated by the clock signal, the high side mosfet switch is turned on. the current flows now from the input capacitor via the high side mosfet switch through the inductor to the output capacitor and load. during this phase, the current ramps up until the pwm comparator trips and the control logic will turn off the switch. the current limit comparator will also turn off the switch in case the current limit of the high side mosfet switch is exceeded. after a dead time preventing shoot through current, the low side mosfet rectifier is turned on and the inductor current will ramp down. the current flows now from the inductor to the output capacitor and to the load. it returns back to the inductor through the low side mosfet rectifier. the next cycle will be initiated by the clock signal again turning off the low side mosfet rectifier and turning on the on the high side mosfet switch. the power save mode is enabled with mode pin set to low level. if the load current decreases, the converter will enter power save mode operation automatically. during power save mode the converter skips switching and operates with reduced frequency in pfm mode with a minimum quiescent current to maintain high efficiency. the converter will position the output voltage typically +1% above the nominal output voltage. this voltage positioning feature minimizes voltage drops caused by a sudden load step. the transition from pwm mode to pfm mode occurs once the inductor current in the low side mosfet switch becomes zero, which indicates discontinuous conduction mode. during the power save mode the output voltage is monitored with a pfm comparator. as the output voltage falls below the pfm comparator threshold of v out nominal +1%, the device starts a pfm current pulse. the high side mosfet switch will turn on, and the inductor current ramps up. after the on-time expires, the switch is turned off and the low side mosfet switch is turned on until the inductor current becomes zero. the converter effectively delivers a current to the output capacitor and the load. if the load is below the delivered current, the output voltage will rise. if the output voltage is equal or higher than the pfm comparator threshold, the device stops switching and enters a sleep mode with typical 15 m a current consumption. if the output voltage is still below the pfm comparator threshold, a sequence of further pfm current pulses are generated until the pfm comparator threshold is reached. the converter starts switching again once the output voltage drops below the pfm comparator threshold. with a fast single threshold comparator, the output voltage ripple during pfm mode operation can be kept small. the pfm pulse is time controlled, which allows to modify the charge transferred to the output capacitor by the value of the inductor. the resulting pfm output voltage ripple and pfm frequency depend in first order on the size of the output capacitor and the inductor value. increasing output capacitor values and inductor values will minimize the output ripple. the pfm frequency decreases with smaller inductor values and increases with larger values. the pfm mode is left and pwm mode entered in case the output current can not longer be supported in pfm mode. the power save mode can be disabled through the mode pin set to high. the converter will then operate in fixed frequency pwm mode. this feature reduces the voltage under/overshoots at load steps from light to heavy load and vice versa. it is active in power save mode and regulates the output voltage 1% higher than the nominal value. this provides more headroom for both the voltage drop at a load step, and the voltage increase at a load throw-off. 15 submit documentation feedback www.ti.com
100% duty cycle low dropout operation undervoltage lockout mode selection TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 detailed description (continued) figure 34. power save mode operation with automatic mode transition the device starts to enter 100% duty cycle mode once the input voltage comes close to the nominal output voltage. in order to maintain the output voltage, the high side mosfet switch is turned on 100% for one or more cycles. with further decreasing vin the high side mosfet switch is turned on completely. in this case the converter offers a low input-to-output voltage difference. this is particularly useful in battery-powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range. the minimum input voltage to maintain regulation depends on the load current and output voltage, and can be calculated as: v in min = v o max + i o max (r ds(on) max + r l ) with: i o max = maximum output current plus inductor ripple current r ds(on) max = maximum p-channel switch rdson. r l = dc resistance of the inductor v o max = nominal output voltage plus maximum output voltage tolerance the undervoltage lockout circuit prevents the device from malfunctioning at low input voltages and from excessive discharge of the battery and disables the output stage of the converter. the undervoltage lockout threshold is typically 1.85v with falling v in . the mode pin allows mode selection between forced pwm mode and power save mode. connecting this pin to gnd enables the power save mode with automatic transition between pwm and pfm mode. pulling the mode pin high forces the converter to operate in fixed frequency pwm mode even at light load currents. this allows simple filtering of the switching frequency for noise sensitive applications. in this mode, the efficiency is lower compared to the power save mode during light loads. the condition of the mode pin can be changed during operation and allows efficient power management by adjusting the operation mode of the converter to the specific system requirements. 16 submit documentation feedback www.ti.com output voltage vout (pwm) vout +1% pfm comparator threshold voltage positioning light loadpfm mode moderate to heavy loadpwm mode
enable soft start short-circuit protection thermal shutdown TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 detailed description (continued) the device is enabled setting en pin to high. during the start up time t start up the internal circuits are settled and the soft start circuit is activated. the en input can be used to control power sequencing in a system with various dc/dc converters. the en pin can be connected to the output of another converter, to drive the en pin high and getting a sequencing of supply rails. with en = gnd, the device enters shutdown mode in which all internal circuits are disabled. in fixed output voltage versions, the internal resistor divider network is then disconnected from fb pin. the TPS62260 has an internal soft start circuit that controls the ramp up of the output voltage. the output voltage ramps up from 5% to 95% of its nominal value within typical 250 m s. this limits the inrush current in the converter during ramp up and prevents possible input voltage drops when a battery or high impedance power source is used. the soft start circuit is enabled within the start up time t start up . the high side and low side mosfet switches are short-circuit protected with maximum switch current = i limf . the current in the switches is monitored by current limit comparators. once the current in the high side mosfet switch exceeds the threshold of it's current limit comparator, it turns off and the low side mosfet switch is activated to ramp down the current in the inductor and high side mosfet switch. the high side mosfet switch can only turn on again, once the current in the low side mosfet switch has decreased below the threshold of its current limit comparator. as soon as the junction temperature, t j , exceeds 140 c (typical) the device goes into thermal shutdown. in this mode, the high side and low side mosfets are turned-off. the device continues its operation when the junction temperature falls below the thermal shutdown hysteresis. 17 submit documentation feedback www.ti.com
application information TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 figure 35. TPS62260 fixed 1.2-v output figure 36. TPS62260drv adjustable 1.2-v output figure 37. TPS62260 fixed 1.5-v output 18 submit documentation feedback www.ti.com v in gnd en fb sw mode c 4.7 f in m l 2.2 h 1 m r 360 k 1 w r 360 k 2 w c22 pf 1 c 10 f out m v 1.2 v out TPS62260drv v in gnd en fb sw TPS62260drv l1 2.2 h c in 4.7f r1 540 k r2 360k c1 22pf c out 10 f v out 1.5v 600 ma mode v in = 2.3vto 6v v in gnd en fb sw tps62262drv l1 2.2 h c in 4.7f c out 10 f v out 1.2v 600 ma mode v in = 2.3v to 6v
output voltage setting with an internal reference voltage v ref typical 0.6v. output filter design (inductor and output capacitor) inductor selection (1) TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 application information (continued) figure 38. tps62261 fixed 1.8-v output the output voltage can be calculated to: to minimize the current through the feedback divider network, r 2 should be 180 k w or 360 k w . the sum of r 1 and r 2 should not exceed ~1m w , to keep the network robust against noise. an external feed forward capacitor c 1 is required for optimum load transient response. the value of c 1 should be in the range between 22pf and 33pf. route the fb line away from noise sources, such as the inductor or the sw line. the TPS62260 is designed to operate with inductors in the range of 1.5 m h to 4.7 m h and with output capacitors in the range of 4.7 m f to 22 m f. the part is optimized for operation with a 2.2 m h inductor and 10 m f output capacitor. larger or smaller inductor values can be used to optimize the performance of the device for specific operation conditions. for stable operation, the l and c values of the output filter may not fall below 1 m h effective inductance and 3.5 m f effective capacitance. the inductor value has a direct effect on the ripple current. the selected inductor has to be rated for its dc resistance and saturation current. the inductor ripple current ( d i l ) decreases with higher inductance and increases with higher v i or v o . the inductor selection has also impact on the output voltage ripple in pfm mode. higher inductor values will lead to lower output voltage ripple and higher pfm frequency, lower inductor values will lead to a higher output voltage ripple but lower pfm frequency. equation 1 calculates the maximum inductor current in pwm mode under static load conditions. the saturation current of the inductor should be rated higher than the maximum inductor current as calculated with equation 2 . this is recommended because during heavy load transient the inductor current will rise above the calculated value. 19 submit documentation feedback www.ti.com v in gnd en fb sw tps62261drv l1 2.2 h c in 4.7f c out 10 f v out 1.8 v 600 ma mode v in = 2.3v to 6v v out v ref 1 r 1 r 2 i l vout 1 vout vin l ?
(2) output capacitor selection (3) (4) TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 application information (continued) with: f = switching frequency (2.25mhz typical) l = inductor value d i l = peak to peak inductor ripple current i lmax = maximum inductor current a more conservative approach is to select the inductor current rating just for the switch current limit i limf of the converter. accepting larger values of ripple current allows the use of lower inductance values, but results in higher output voltage ripple, greater core losses, and lower output current capability. the total losses of the coil have a strong impact on the efficiency of the dc/dc conversion and consist of both the losses in the dc resistance (r (dc) ) and the following frequency-dependent components: the losses in the core material (magnetic hysteresis loss, especially at high switching frequencies) additional losses in the conductor from the skin effect (current displacement at high frequencies) magnetic field losses of the neighboring windings (proximity effect) radiation losses table 1. list of inductors dimensions [mm 3 ] inductance m h inductor type supplier 2.5x2.0x1.0max 2.0 mips2520d2r2 fdk 2.5x2.0x1.2max 2.0 mipsa2520d2r2 fdk 2.5x2.0x1.0max 2.2 ksli-252010ag2r2 htachi metals 2.5x2.0x1.2max 2.2 lqm2hpn2r2mj0l murata 3x3x1.5max 2.2 lps3015 2r2 coilcraft the advanced fast-response voltage mode control scheme of the TPS62260 allows the use of tiny ceramic capacitors. ceramic capacitors with low esr values have the lowest output voltage ripple and are recommended. the output capacitor requires either an x7r or x5r dielectric. y5v and z5u dielectric capacitors, aside from their wide variation in capacitance over temperature, become resistive at high frequencies. at nominal load current, the device operates in pwm mode and the rms ripple current is calculated as: at nominal load current, the device operates in pwm mode and the overall output voltage ripple is the sum of the voltage spike caused by the output capacitor esr plus the voltage ripple caused by charging and discharging the output capacitor: at light load currents, the converter operates in power save mode and the output voltage ripple is dependent on the output capacitor and inductor value. larger output capacitor and inductor values minimize the voltage ripple in pfm mode and tighten dc output accuracy in pfm mode. 20 submit documentation feedback www.ti.com i rmscout vout 1 vout vin l ? 1 2 3 vout vout 1 vout vin l ? 1 8 cout ? esr i lmax i outmax i l 2
input capacitor selection layout considerations TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 an input capacitor is required for best input voltage filtering, and minimizing the interference with other circuits caused by high input voltage spikes. for most applications, a 4.7 m f to 10 m f ceramic capacitor is recommended. because ceramic capacitor loses up to 80% of its initial capacitance at 5 v, it is recommended that 10 m f input capacitors be used for input voltages > 4.5v. the input capacitor can be increased without any limit for better input voltage filtering. take care when using only small ceramic input capacitors. when a ceramic capacitor is used at the input and the power is being supplied through long wires, such as from a wall adapter, a load step at the output or vin step on the input can induce ringing at the vin pin. this ringing can couple to the output and be mistaken as loop instability or could even damage the part by exceeding the maximum ratings. table 2. list of capacitors capacitance type size supplier 4.7 m f grm188r60j475k 0603 1.6x0.8x0.8mm 3 murata 10 m f grm188r60j106m69d 0603 1.6x0.8x0.8mm 3 murata figure 39. suggested layout for fixed output voltage options 21 submit documentation feedback www.ti.com
TPS62260 , tps62261 , tps62262 slvs763 ? june 2007 figure 40. suggested layout for adjustable output voltage version as for all switching power supplies, the layout is an important step in the design. proper function of the device demands careful attention to pcb layout. care must be taken in board layout to get the specified performance. if the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well as emi problems. it is critical to provide a low inductance, impedance ground path. therefore, use wide and short traces for the main current paths. the input capacitor should be placed as close as possible to the ic pins as well as the inductor and output capacitor. connect the gnd pin of the device to the powerpad? of the pcb and use this pad as a star point. use a common power gnd node and a different node for the signal gnd to minimize the effects of ground noise. connect these ground nodes together to the powerpad (star point) underneath the ic. keep the common path to the gnd pin, which returns the small signal components and the high current of the output capacitors as short as possible to avoid ground noise. the fb line should be connected right to the output capacitor and routed away from noisy components and traces (e.g., sw line). 22 submit documentation feedback www.ti.com gnd c out c i n v out v in u l gnd r1 r2 c1
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) TPS62260ddcr active to/sot ddc 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260ddcrg4 active to/sot ddc 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260ddct active to/sot ddc 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260ddctg4 active to/sot ddc 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260drvr active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260drvrg4 active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260drvt active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim TPS62260drvtg4 active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62261drvr active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62261drvrg4 active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62261drvt active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62261drvtg4 active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62262drvr active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62262drvrg4 active son drv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62262drvt active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim tps62262drvtg4 active son drv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) package option addendum www.ti.com 23-jul-2007 addendum-page 1
(3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 23-jul-2007 addendum-page 2
tape and reel information package materials information www.ti.com 9-jul-2007 pack materials-page 1
device package pins site reel diameter (mm) reel width (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant TPS62260ddcr ddc 5 nse 179 8 3.2 3.2 1.4 4 8 q3 TPS62260ddct ddc 5 mla 179 8 3.2 3.2 1.4 4 8 q3 TPS62260ddct ddc 5 nse 179 8 3.2 3.2 1.4 4 8 q3 TPS62260drvr drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 TPS62260drvt drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 tps62261drvr drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 tps62261drvt drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 tps62262drvr drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 tps62262drvt drv 6 nse 179 8 2.2 2.2 1.2 4 8 q2 tape and reel box information device package pins site length (mm) width (mm) height (mm) TPS62260ddcr ddc 5 nse 195.0 200.0 45.0 TPS62260ddct ddc 5 mla 195.0 200.0 45.0 TPS62260ddct ddc 5 nse 195.0 200.0 45.0 TPS62260drvr drv 6 nse 195.0 200.0 45.0 TPS62260drvt drv 6 nse 195.0 200.0 45.0 tps62261drvr drv 6 nse 195.0 200.0 45.0 tps62261drvt drv 6 nse 195.0 200.0 45.0 tps62262drvr drv 6 nse 195.0 200.0 45.0 tps62262drvt drv 6 nse 195.0 200.0 45.0 package materials information www.ti.com 9-jul-2007 pack materials-page 2
package materials information www.ti.com 9-jul-2007 pack materials-page 3

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