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rt34063a 1 ds34063a-13 march 2007 www.richtek.com features z z z z z operation from 3.0v to 30v input z z z z z low standby current z z z z z current limiting z z z z z internal switch current to 1.5a z z z z z output voltage adjustable z z z z z frequency operation to 100khz z z z z z precision 2% reference z z z z z rohs compliant and 100% lead (pb)-free pin configurations applications z saver for cellular phones z dc-dc converter module dc-to-dc converter control circuits ordering information general description the rt34063a series is a monolithic control circuit containing the primary functions required for dc-to-dc converters. these devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. this series was specially designed to be incorporated in step-down and step-up and voltage-inverting applications with a minimum number of external components. (top view) dip-8 / sop-8 sc se tc gnd comp vcc ipk driver 2 3 4 5 6 7 8 note : richtek pb-free and green products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. ` 100%matte tin (sn) plating. functional pin description pin name pin function sc 1.5a switch collector se darlington switch emitter tc oscillator timing capacitor gnd power gnd comp feedback comparator inverting input vcc power supply input ipk highside current sense input vcc-v ipk = 330mv driver driver collector rt34063a package type n : dip-8 s : sop-8 operating temperature range p : pb free with commercial standard g : green (halogen free with commer- cial standard)
rt34063a 2 ds34063a-13 march 2007 www.richtek.com function block diagram 1 8 comp sc tc sq r q2 100 comparator 2 3 4 5 6 7 se vcc ipk driver gnd i pk c t oscillator 1.25v reference regulator q1 + - typical application circuit sq r i pk c t osc 1.25v ref comp 170uh l + - + + 1 2 3 4 5 6 7 8 180 r sc 0.22 v in 12v 100uf r1 2.2k r2 47k c o 330uf v out 28v/175ma 1n5819 + optional filter 1.0uh 100uf v out c t 1500pf figure 1. step-up converter
rt34063a 3 ds34063a-13 march 2007 www.richtek.com (a) external npn switch (b) external npn saturated switch (see note) figure 2. external current boost connections for i c peak greater than 1.5a note: if the output switch is driven into hard saturation (non-darlington configuration) at low switch currents ( 300ma) and high driver currents ( 30ma), it may take up to 2.0 s to come out of saturation. this condition will shorten the off time at frequencies 30khz, and is magnified at high temperature. this condition does not occur with a darlington configuration, since the output switch cannot saturate. if a non-darlington configuration is used, the following output drive condition is recommended. + 1 2 3 4 5 6 7 8 v in v out + 1 2 3 4 5 6 7 8 v in v out r 0 for constant vin r
rt34063a 4 ds34063a-13 march 2007 www.richtek.com figure 3. step-down converter sq r i pk c t osc 1.25v ref comp 220uh l + - + + 1 2 3 4 5 6 7 8 r sc 0.33 v in 25v 100uf r1 1.2k r2 3.6k c o 470uf v out 5.0v/500ma 1n5819 + optional filter 1.0uh 100uf v out c t 470pf q1 q2
rt34063a 5 ds34063a-13 march 2007 www.richtek.com (a) external npn switch (b) external pnp saturated switch figure 4. external current boost connections for i c peak greater than 1.5a + 1 2 3 4 5 6 7 8 v in v out + 1 2 3 4 5 6 7 8 v in v out
rt34063a 6 ds34063a-13 march 2007 www.richtek.com figure 5. voltage inverting converter 4.5v to 6.0v sq r i pk c t osc 1.25v ref comp 88uh l + - + + 1 2 3 4 5 6 7 8 180 r sc 0.24 v in 100uf r1 8.2k r2 953 c o 1000uf v out -12v/100ma 1n5819 + optional filter 1.0uh 100uf v out 1500pf q1 q2
rt34063a 7 ds34063a-13 march 2007 www.richtek.com (a) external npn switch (b) external pnp saturated switch figure 6. external current boost connections for peak greater than 1.5a + 1 2 3 4 5 6 7 8 v in v out + 1 2 3 4 5 6 7 8 v in v out
rt34063a 8 ds34063a-13 march 2007 www.richtek.com design formula table calculation step-up step-down voltage-inverting t on /t off sat (min) in (min) in f out v v v v v ? ? + out sat (min) in f out v v v v v ? ? + sat in f out v v v v ? + (t on + t off ) f 1 f 1 f 1 t off 1 t t t t off on off on + + 1 t t t t off on off on + + 1 t t t t off on off on + + t on () off off on t t t ? + () off off on t t t ? + () off off on t t t ? + c t on 5 t 10 4.0 ? on 5 t 10 4.0 ? on 5 t 10 4.0 ? ipk (switch) ? ? ? ? ? ? + 1 t t i 2 off on (max) out (max) out i 2 ? ? ? ? ? ? + 1 t t i 2 off on out(max) r sc 0.3/ipk (switch) 0.3/ipk (switch) 0.3/ipk (switch) (min) l () ) max ( on (switch) sat ) min ( in t ipk v v ? ? ? ? ? ? ? ? ? () ) max ( on ) switch ( sat ) min ( in t ipk v v ? ? ? ? ? ? ? ? ? () ) max ( on ) switch ( sat ) min ( in t ipk v v ? ? ? ? ? ? ? ? ? c o (pp) vripple ton i 9 out ) pp ( ripple off on ) switch ( pk v 8 ) t t ( i + (pp) vripple ton i 9 out v sat : saturation voltage of the output switch. v f : forward voltage drop of the output rectifier. the following power supply characteristics must be chosen: v in : nominal input voltage. v out : desired output voltage i out : desired output current. f : minimum desired output switching frequency at the selected values of vin and i o. v ripple(pp) : desired peak-to-peak output ripple voltage. in practice, the calculated capacitor value needs to be increased due to its equivalent series resistance and board layout. the ripple voltage should be kept to a low value since it directly affects the line and load regulation. 2 out 1 r v = 1.25(1+ ) r
rt34063a 9 ds34063a-13 march 2007 www.richtek.com absolute maximum ratings z power supply v oltage ------------------------------------------------------------------------------------------------ 30v z feedback input v oltage ra nge ------------------------------------------------------------------------------------- ? 0.3 to +30v z switch collector v oltage --------------------------------------------------------------------------------------------- 30v z switch emitter v oltage ----------------------------------------------------------------------------------------------- 30v z switch collector to emitter v oltage ------------------------------------------------------------------------------- 30v z driver collector v oltage ---------------------------------------------------------------------------------------------- 30v z driver collector current (see note) -------------------------------------------------------------------------------- 100ma z switch current --------------------------------------------------------------------------------------------------------- 1.5a z power dissipation, p d @ t a = 25 c dip-8 --------------------------------------------------------------------------------------------------------------------- 1.25w sop-8 -------------------------------------------------------------------------------------------------------------------- 0.625w z package thermal resistance dip-8, ja --------------------------------------------------------------------------------------------------------------- 100 c/w sop-8, ja -------------------------------------------------------------------------------------------------------------- 160 c/w z operating junction temperature ----------------------------------------------------------------------------------- +125 c z storage temperature range ---------------------------------------------------------------------------------------- 65 to +150 c note:maximum package power dissipation limits must be observed. electrical characteristics (vcc = 5v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max units oscillator frequency v pin5 = 0v, c t = 1.0nf 26 38 48 khz charge current i chg 5.0v vcc 30v 25 36 43 vcc 30v 160 250 290 output switch saturation voltage, darlington connection i sw = 1.0a, pins1, 8 connected -- 1.0 1.3 v saturation voltage, darlington connection i sw = 1.0a, r pin8 = 82 to vcc, forced ? 20 -- 0.45 0.7 v dc current gain i sw = 1.0a, v ce = 5.0v 50 75 -- -- collector off-state current v ce = 30v -- 0.01 100 comparator threshold voltage 1.225 1.25 1.275 v threshold voltage line regulation 3.0v vcc 30v -- 1.4 5.0 mv input bias current i bias v in = 0v -- -20 -400 na total device supply current i cc vcc = 5.0v to 30v, c t = 1.0nf , pin7 = vcc , v pin5 > v th , pin2 = gnd , remainin g p ins o p en -- 3.0 4.5 ma
rt34063a 10 ds34063a-13 march 2007 www.richtek.com typical operating characteristics output switch on-off time vs. oscillator timing capacitor 1 10 100 1000 0.01 0.1 1 10 tc, oscilator timing capacitor (nf) t on-off , output switch on-off time (us) v cc = 5.0v pin 7 = v cc pin 5 = gnd t a = 25 c standyby supply current vs. supply voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 5 10 15 20 25 30 supply voltage (v) icc, supply current (ma) . v cc = 5.0v pin 7 = v cc pin 5 = 2.0v pin 2 = gnd t a = 25 c time (10us/div) timing capacitor waveform v out = 5.0v pin 1,8 = open, pin 7 = v cc c t = 1.0nf ,pin 5 = gnd t a = 25 c current limit sense voltage vs. temperature 200 220 240 260 280 300 320 340 360 380 400 -40 -20 0 20 40 60 80 temperature current limit sense voltage (mv) . v cc = 5.0v i charge = i discharge ( c) emitter follower configuration output saturation voltage vs. emiter current 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 0 0.3 0.6 0.9 1.2 1.5 ie, emitter current (a) vce, saturation voltage (v) a v cc = 5.0v pin 1,7,8 = v cc pin 3,5 = gnd t a = 25 c common emiter configuration output switch saturation voltage vs. collector current 0.0 0.2 0.4 0.6 0.8 1.0 0 0.3 0.6 0.9 1.2 1.5 icc, collector current (a) vce, saturation voltage (v) a v cc = 5.0v pin 7 = v cc pin 2,3,5 = gnd t a = 25 c
rt34063a 11 ds34063a-13 march 2007 www.richtek.com i c vs. v ce(q1) curve 0 300 600 900 1200 1500 1800 0 160 320 480 640 800 v ce (mv) i c (ma) t j = 70 c i b = 34ma i b = 15ma i b = 8ma i b = 2.4ma i c vs. v ce(q1) curve 0 400 800 1200 1600 2000 0 160 320 480 640 800 v ce (mv) i c (ma) t j = 0 c i b = 34ma i b = 15ma i b = 8ma i b = 2.4ma i c vs. v ce(q1) curve 0 400 800 1200 1600 2000 0 160 320 480 640 800 v ce (mv) i c (ma) t j = -20 c i b = 34ma i b = 15ma i b = 8ma i b = 2.4ma i c vs. v ce(q1) curve 0 400 800 1200 1600 2000 0 160 320 480 640 800 v ce (mv) i c (ma) t j = -10 c i b = 15ma i b = 34ma i b = 8ma i b = 2.4ma i c vs. v ce(q1) curve 0 400 800 1200 1600 2000 0 160 320 480 640 800 v ce (mv) i c (ma) t j = 25 c i b = 34ma i b = 15ma i b = 8ma i b = 2.4ma
rt34063a 12 ds34063a-13 march 2007 www.richtek.com outline dimension j a b e c i d l f 8-lead dip plastic package dimensions in millimeters dimensions in inches symbol min max min max a 9.068 9.627 0.357 0.379 b 6.198 6.604 0.244 0.260 c 3.556 4.318 0.140 0.170 d 0.356 0.559 0.014 0.022 e 1.397 1.651 0.055 0.065 f 2.337 2.743 0.092 0.108 i 3.048 3.556 0.120 0.140 j 7.366 8.255 0.290 0.325 l 0.381 0.015
rt34063a 13 ds34063a-13 march 2007 www.richtek.com richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corporation taipei office (marketing) 8f, no. 137, lane 235, paochiao road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)89191466 fax: (8862)89191465 email: marketing@richtek.com a b j f h m c d i 8-lead sop plastic package dimensions in millimeters dimensions in inches symbol min max min max a 4.801 5.004 0.189 0.197 b 3.810 3.988 0.150 0.157 c 1.346 1.753 0.053 0.069 d 0.330 0.508 0.013 0.020 f 1.194 1.346 0.047 0.053 h 0.170 0.254 0.007 0.010 i 0.050 0.254 0.002 0.010 j 5.791 6.200 0.228 0.244 m 0.400 1.270 0.016 0.050

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