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?005 fairchild semiconductor corporation 1 www.fairchildsemi.com november 2005 f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current f an1539/fan1540 1a/1.3a, ldo with low quiescent current features ve ry low ground current (i gnd = 1ma) excellent line regulation excellent load regulation ve ry low transient overshoot stable with low esr output capacitor (esr = 0m ? ) thermal shutdown current limit output options: 3.3v and 1.8v applications disk drive circuits desktop computers laptop, notebook computers general purpose three terminal regulator description the fan1539/fan1540 series of high current ldos (1.0a and 1.3a) has been developed for portable appli- cations where low quiescent current is an important requirement. the device features excellent line and load transient response which does not exceed 10% of nomi- nal output value for full operating temperature range ev en during power on cycle and short circuit removal. internally trimmed, temperature compensated bandgap reference guarantees 2.5% accuracy for full range of input voltage, output current and temperature. included on the chip are accurate current limit and thermal shut- down protection. device stability is achieved with only two external low esr ceramic capacitors. the fan1539/fan1540 is available in thermally enhanced 3x3mm 6-lead mlp, 5x6mm 8-lead mlp and 3-lead to-252 packages. the 5x6mm mlp package ver- sion features a separate kelvin sense pin for high preci- sion applications. ordering information t ape and reel information product number output voltage package f an1540mmpx 3.3v 5x6mm 8-lead mlp in t&r f an1539mpx 3.3v 3x3mm 6-lead mlp in t&r f an1540mpx 3.3v 3x3mm 6-lead mlp in t&r f an1540dx 3.3v 3-lead to-252 in t&r f an1540d18x 1.8v 3-lead to-252 in t&r quantity reel size width 3000 7" 8mm
2 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current block diagram notes: 1. no connection for fan1540mmpx. 2 . v sen available for fan1540mmpx. pin assignments pin description symbol name and function v in input pin gnd ground pin (tab) v out output pin: fixed output voltage v sen output sense pin. connect to v out if kelvin sensing is not required nc no connection currrent limit thermal shutdown bandgap reference v in v out v sense gnd start-up circuit error amplifier x (note 1) (note 2) top view v in gnd 3-lead to-252 package v out f an1540 5x6mm 8-lead mlp 1 2 3 45 6 7 8 fa n1540 fa n1539/fan1540 gnd v out v sen v in gnd gnd gnd gnd v in nc gnd nc nc v out 1 2 3 6 5 4 3x3mm 6-lead mlp
3 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current absolute maximum ratings notes: 3. junction to ambient thermal resistance, ja, is a strong function of pcb material, board thickness, thickness and number of copper plains, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics.thermal resistance ( ja ), v in , i out must be chosen not to exceed t j = 150 c. 4. soldering temperature should be 260 c for 10 second after 240 c for 30 second in i.r. reflow using 60/40 solder. maximum rate of temperature rise is 3 c/sec to within 100 c of the final temperature. 5. using mil std. 883e, method 3015.7(human body model) and eia/jesd22c101-a (charge device model). p arameter symbol value units operating input voltage v in 10 v po w er dissipation p d internally limited w short circuit output current i osh internally limited a operating junction temperature range t j 0 to 150 c thermal resistance?unction to tab, to-252 jc 3 c/w thermal resistance?unction to tab, 3mmx3mm 6-lead mlp (note 3) jc 8 c/w thermal resistance?unction to tab, 5mmx6mm 8-lead mlp (note 3) jc 4 c/w storage temperature range (note 3) t stg -65 to 150 c lead temperature (i.r. re?w) 30 sec. (note 4) t lead 240 c lead temperature (soldering) 10 sec. (note 4) t lead 260 c electrostatic discharge protection (note 5) hbm esd 4 kv cdm 2
4 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current electrical characteristics?an1539mpx, fan1540mpx, fan1540mmpx, f an1540dx unless otherwise speci?d, v in = 4.50v to 7v, t j = 25?, i max (fan1539) = 1.0a, i max (fan1540) = 1.3a. boldface limits apply over operating junction temperature range of 0? t j 125? . p arameter symbol t est conditions test limits units v in i out min. typ. max. output voltage fan1540 v out 4.75v v in 5.25v 5ma i out i max 3.234 3.300 3.366 v 3.217 3.383 line regulation reg (line) 3.0v v in 5.25v 5ma i out i max 2 15 mv load regulation reg (load) 4.75v 5ma i out i max f an1539 25 35 mv f an1540 30 40 dropout voltage (note 6) v d i out = i max 0.9 1.2 v current limit i s 5.5v 3.3 a min. output current for regulation ( ? v out 3%) i omin 0 ma temperature stability t s i out = 5ma 0.3 % rms output noise (note 7) v n i out = i max 0.003 %v out ripple rejection ratio (note 8) r a 5v i out = 10ma 65 75 db i out = 100ma 63 73 i out = i max 45 57 transient response change of v out with step load change (note 9) 5v 1ma to i max t r 1? 2.0 10 (under- shoot or ov ershoot of v out ) % i max to 1ma t f 1? transient response change of v out with application of v in (note 9) 0 to 5v step input t r 1? 10% to 90% 1ma i out i max 5.0 10 (under- shoot or ov ershoot of v out ) % transient response short circuit removal response (note 9) @i out = short 5v i out = short to i out = 10ma 5.0 10 (over- shoot or under- shoot of v o ) % quiescent current i gnd v in 7v i out = 0ma 1.0 2.0 ma ? v out ? i out ------------------ ? v out ? v in ------------------ ? v out v in ? ------------------
5 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current notes: 6. dropout voltage is defined as the input to output differential voltage at which the output voltage drops 1% below the nominal value measured at v in = 5v. 7. measured within 10hz to 10khz bandwidth. 8. measured at dc, specified at 120 hz. 9. c in = 22?, c out = 10?. both capacitors are low esr x7r type. t est circuit quiescent current i gnd v in 7v 2ma i out i max 1.0 2.0 ma quiescent current i gnd v in = 5v 0ma i out 50ma 1.0 2.0 ma thermal shutdown t jsd 3.0v v in 5.25v 160 c thermal hysteresis t hyst 3.0v v in 5.25v 15 c p arameter symbol t est conditions test limits units v in i out min. typ. max. dut gnd c in v in v out c out notes: 1. use low esr capacitors. 2. c in should be placed as close to v in as possible. in out 22 f 10 f electrical characteristics?an1539mpx, fan1540mpx, fan1540mmpx, f an1540dx (continued) unless otherwise speci?d, v in = 4.50v to 7v, t j = 25?c, i max (fan1539) = 1.0a, i max (fan1540) = 1.3a. boldface limits apply over operating junction temperature range of 0? t j 125? .
6 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current electrical characteristics?an1540d18x unless otherwise speci?d, v in = 3.135v to 3.465v, t j = 25?, i max = 1.3a. boldface limits apply over operating junction temperature range of 0? t j 125? . notes: 6 dropout voltage is defined as the input to output differential voltage at which the output voltage drops 1% below the nominal value measured at v in = 3.3v. 7. measured within 10hz to 10khz bandwidth. 8. measured at dc, specified at 120 hz. 9. c in = 22?, c out = 10?. both capacitors are low esr x7r type. p arameter symbol t est conditions test limits units v in i out min. typ. max. output voltage v out 3.15v v in 3.465v 5ma i out i max 1.755 1.800 1.845 v line regulation reg (line) 3.135v v in 3.465v 5ma i out i max 310 mv load regulation reg (load) 3.3v 5ma i out i max 20 40 mv dropout voltage (note 6) v d i out = i max 0.9 1.2 v current limit i s 3.3v 2.5 a min. output current for regulation ( ? v out 3%) i omin 0 ma temperature stability t s i out = 5ma 0.3 % rms output noise (note 7) v n i out = i max 0.003 %v out ripple rejection ratio (note 8) r a 3.3v i out = 500ma 40 db transient response change of v out with step load change (note 9) 3.3v 1ma to i max t r 1? 2.0 10 (undershoot or overshoot of v out ) % i max to 1ma t f 1? transient response change of v out with application of v in (note 9) 0 to 1.8v step input t r 1? 10% to 90% 1ma i out i max 3.0 10 (undershoot or overshoot of v out ) % transient response short circuit removal response (note 9) @i out = short 3.3v i out = short to i out = 10ma 3.0 10 (overshoot or under- shoot of v o ) % quiescent current i gnd 3.3v i out = 0ma 1.0 2.0 ma quiescent current i gnd 3.3v 2ma i out i max 1.0 2.0 ma thermal shutdown t jsd 160 c thermal hysteresis t hyst 10 c ? v out ? i out ------------------ ? v out ? v in ------------------ ? v out v in ? ------------------
7 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current t est circuit dut gnd c in v in v out c out notes: 1. use low esr capacitors. 2. c in should be placed as close to v in as possible. in out 22 f 10 f
8 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current t ypical performance characteristics?an1539mpx, fan1540mpx, f an1540mmpx, fan1540dx 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 050 100 150 0.7 0.8 0.9 1.0 1.1 1.2 1.3 0 200 400 600 800 1000 1200 1400 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 -50 0 50 100 150 4 -50 0 50 100 5678910 3.275 3.280 3.285 3.290 3.295 3.300 3.305 3.310 v in = 5v i out = 5m a typical 3.3v device i out = 10ma typical 3.3v device v in = 5v v in = 5v i out = 10ma i out = 10 ma v in = 5v ground pin current vs. temperature output voltage vs. temperature ground pin current vs. input voltage ground pin current vs. output current 0. 0 0.5 1. 0 1. 5 2. 0 2.5 3. 0 3. 5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 output voltage vs. output current dropout voltage vs. temperature v in = 5v t j = 25 c 0.6 0.7 0.8 0.9 1.0 1.1 1.2 i out = 1.3 a i o u t = 0 . 5 a i o u t = 1a ambient temperature ( c) ambient temperature ( c) output voltage (v) quiescent current (ma) quiescent current (ma) quiescent current (ma) input voltage (v) output current (ma) output current (a) ambient temperature ( c) output voltage (v) dropout voltage (v)
9 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current t ypical performance characteristics?an1539mpx, fan1540mpx, f an1540mmpx, fan1540dx (continued) note: transient response tests require short lead lengths and low resistance connections at source and load. line transient response output voltage (50mv/div) output voltage (2.5v/div) output voltage (50mv/div) output current (2.5a/div) output voltage (20mv/div) output current (0.5a/div) time (20 s/div) time (40 s/div) time (20 s/div) load transient response t r = 1 s t r = 1 s t j = 25 c i out = i max c in = 22 f c out = 10 f c out = 10 f (ceramic low esr capacitors) (ceramic low esr capacitors) c in = 22 f t f = 1 s t j = 25 c v in = 5v short circuit removal response output spectral noise density vs. frequency typical region of stability esr vs. output current* v in = 5v 10 ma ~3.3a 10 1 10 2 10 3 10 4 10 5 10 6 0 0 10 100 1k 10k 100k 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 10 20 30 40 50 60 70 80 90 100 ripple rejection vs. frequency v in = 5v i out = 10ma c out = 10 f (low esr) fr eq ue ncy (h z) output spectral noise density ( v rms /rthz) esr (m ? ) (equivalent series resistance) 0.1 0 200 400 600 800 1000 1200 1400 1 10 100 1000 *note: esr values measured at f = 10khz region of instability region of stability 3.300v 3.300v 3.300v output current (ma) ripple rejection (db) frequency (hz) c out = 10 f (ceramic low esr capacitors) c in = 22 f t f = 1 s t j = 25 c c in = 22 f c out = 10 f ceramic low esr v in = 5v c in = 22 f c out = 10 f t j = 25 c v in = 5v i out = i max
10 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current t ypical performance characteristics?an1540d18x 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 050 100 150 0 50 100 150 1.775 1.780 1.785 1.790 1.795 1.800 1.805 1.810 0.7 0.8 0.9 1.0 1.1 1.2 1.3 0 345678910 200 400 600 800 1000 1200 1400 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 i out = 10ma typical 1.8v device v in = 3.3v v in = 3.3v i out = 10ma i out = 10ma v in = 3.3v output voltage vs. temperature ground pin current vs. temperature ground pin current vs. input voltage ground pin current vs. output current dropout voltage vs. temperature output voltage vs. output current v in = 3.3v t j = 25 c 050 -50 100 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.4 1.5 1.6 1.7 1.8 1.9 i out = 1.3a i o u t = 0 . 5 a i o u t = 1a ambient temperature ( c) ambient temperature ( c) output voltage (v) quiescent current (ma) quiescent current (ma) quiescent current (ma) input voltage (v) output current (ma) output current (a) ambient temperature ( c) output voltage (v) dropout voltage (v)
11 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current applications information general circuit description the fan1539/fan1540 is an advanced low dropout volt- age regulator, specially designed for applications in por- table computers, where high performance and low quiescent current are required. the device has an inter- nal trimmed bandgap voltage reference and an internal output voltage sense divider. these two signals form the input to the error ampli?r which regulates the output v oltage. the fan1539/fan1540 has a complete set of internal protection circuitry including thermal shutdown, short cir- cuit current limit and electrostatic discharge protection. low esr ceramic capacitors are needed for input as w ell as output pins to maintain the circuit stability. short circuit current limit the device has internal over-current limit and short cir- cuit protection. under over-current conditions the device current is determined by the current limit threshold. once the device is released from short circuit conditions, the normal level of current limit is gradually re-established as the device output voltage reaches normal levels. special circuitry has been added to ensure that recovery from short circuit current conditions does not lead to exces- sive overshoot of the output voltage ?a phenomenon often encountered in conventional regulators. thermal protection the fan1539/fan1540 is designed to supply at least 1a/1.3a output currents. excessive output load at high input-output voltage difference will cause the device tem- perature to increase and exceed maximum ratings due to power dissipation. during output overload conditions, when the die temperature exceeds the shutdown limit temperature of 160?, an onboard thermal protection will disable the output until the temperature drops approxi- mately 15? below the limit, at which point the output is re-enabled. thermal characteristics the fan1539/fan1540 is designed to supply at least 1a/1.3a at the speci?d output voltage with an operating die (junction) temperature of up to 125?. once the power dissipation and thermal resistance is known, the maximum junction temperature of the device can be cal- culated. while the power dissipation is calculated from known electrical parameters, the actual thermal resis- tance depends on the thermal characteristics of the cho- sen package and the surrounding pc board copper to which it is mounted. the power dissipation is equal to the product of the input-to-output voltage differential and the output current plus the ground current multiplied by the input voltage, or: the ground pin current, i gnd can be found in the charts provided in the ?lectrical characteristics section. the relationship describing the thermal behavior of the package is: where t j(max) is the maximum allowable junction temper- ature of the die, which is 150?, and t a is the ambient operating temperature. ja is dependent on the sur- rounding pc board layout and can be empirically obtained. while the jc (junction-to-case) of the 6-lead mlp package is speci?d at 8? /w, the ja f or a mini- m um pwb footprint will be in substantially higher. this can be improved upon by providing a heat sink of sur- rounding copper ground on the pwb. depending on the size of the copper area, and the thickness of the copper layer, the resulting ja can vary over a wide range. the addition of backside copper with through-holes, stiffen- ers, and other enhancements can also aid in reducing thermal resistance. thermal simulations performed on a thermally optimized board layout indicate that ja as low as 20 c /w can be achieved. f or example, the heat contributed by the dissipation of other devices located nearby must be included in the design consider- ations. overload conditions also need to be considered. it is possible for the device to enter a thermal cycling loop, in which the circuit enters a shutdown condition, cools, re- enables, and then again overheats and shuts down repeatedly due to a persistent fault condition. capacitor esr and printed circuit board layout the fan1539/fan1540 has been optimized to accom- modate low esr bypass capacitors down to 0 m ? . f or best results it is important to place both input and output bypass capacitors as near to the input and output pins as possible. use of x7r types such as muratas grm31cr70j106ka01b (10 ?) and grm43er71a226ke01b (22 ?) or similar compo- nent from tdk. the capacitors should connect directly to the ground plane. use of ground plane on the top and the bottom side of the pcb is recommended. as many vias as possible should be used to minimize ground plane resistance. p d v in v out () i out v in i gnd + = p d max () t j max () t a ja -------------------------------- ?? ?? ?? =
12 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current mechanical dimensions 5x6mm 8-lead mlp notes: b) dimensions are in millimeters. a) does not fully conform to jedec registration mo-229, dated 11/2001. c) dimensioning and tolerances per asme y14.5?994. land pattern recommendation top view side view bottom view 3.81 1.27 pin #1 ident. (optional) 1.27 typ 0.65 typ (1.00) 3.50 4.50 4.25 6.25 1.0 max c c c mc m 0.10 0.10 0.08 0.05 c ab 0.05 0.00 0.28?.40 4.25 1.75 3.25 1.25 0.75 0.35 seating plane a a a a a 1234 8765 (0.25) 6.0 b a 5.0 0.25 2x c 0.25 2x c
13 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current mechanical dimensions 3x3mm 6-lead mlp 0.15 c 2x 3.0 2.6 2.6 0.15 c 2x 0.10 c 2x 0.10 c 2x 0.10 c 0.08 c 1.0 max seating plane 0 ~12 (0.20) 2.25 0.2 min 0.95 1.90 1.65 0.30~0.45 0.10 m c c ab 1 3 6 4 a 3.0 1.85 2.15 (0.65) recommended land pattern 2.45 3.45 0.65 typ 0.95 typ t op view 1.00 0.65 0.05 0.00 0.45 0.20 side view notes: a. conforms to jedec registration mo-229, v ariation veea, dated 11/2001 b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994 bottom view b c 0.05 m
14 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current mechanical dimensions 3-lead to-252 d d1 gage plane notes: unless otherwise specified a) all dimensions are in millimeters. b) this package conforms to jedec, to-252, issue c. variation aa & ab, dated nov. 1999. c) dimensioning and tolerancing per asme y14.5?994. d) heat sink top edge could be in chamfered corners or edge protrusion. e) dimensions l3, d, e1 & d1 table: option aa option ab 0.89 ?1.27 1.52 ?2.03 5.97 ?6.22 5.33 ?5.59 4.32 min 3.81 min 5.21 min l3 d e1 d1 4.57 min 0.51 seating plane detail a (1.54) 1.78 1.40 0.61 0.46 10 0 0.127 max (rotated ?0 ) scale 12x e1 l3 1 1 2 3 1 2 3 4 3 4 6.73 6.35 1.02 0.64 6.25 6.00 min 6.50 min 4.60 2.39 2.18 0.58 0.46 0.10 b 10.41 9.40 see detail a 3.00 min 1.40 min land pattern recommendation 1.14 0.76 0.89 0.64 see note d (0.59) 2.29 5.46 5.21 4.57 0.25 a c mm (2.90) 2.30 c a b
15 www.fairchildsemi.com f an1539/fan1540 rev. 1.1.1 f an1539/fan1540 1a/1.3a, ldo with low quiescent current disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. life support policy fa irchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information preliminary no identification needed obsolete this datasheet contains the design specifications for product development. specifications may change in any manner without notice. this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. formative or in design first production full production not in production isoplanar littlefet microcoupler microfet micropak microwire msx msxpro ocx ocxpro optologic optoplanar p acman pop power247 poweredge f ast f astr fps frfet globaloptoisolator gto hisec i 2 c i-lo implieddisconnect intellimax rev. i17 acex activearray bottomless build it now coolfet crossvolt dome ecospark e 2 cmos ensigna f act f act quiet series powersaver powertrench qfet qs qt optoelectronics quiet series rapidconfigure rapidconnect serdes scalarpump silent switcher smart start spm ste alth superfet supersot-3 supersot-6 supersot-8 syncfet tinylogic tinyopto trutranslation uhc ultrafet unifet vcx wire across the board. around the world. the power franchise programmable active droop

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