ds04-27703-2e fujitsu semiconductor data sheet assp for power supply applications (lithium ion battery charger) dc/dc converter ic for charging MB3875/mb3877 n n n n description the MB3875 and mb3877 are charging dc/dc converter ics suitable for down-conversion, which uses pulse width modulation (pwm) for controlling the output voltage and current independently. these ics can dynamically control the secondary batterys charge current by detecting a voltage drop in an ac adapter in order to keep its power constant (dynamically-controlled charging). the charging method enables quick charging, for example, with the ac adapter during operation of a notebook pc. with an on-chip output voltage setting resistor which allows the output voltage to be set at high precision, these ics are best suited as internal battery chargers for notebook pcs. the MB3875 and mb3877 support 3-cell and 4-cell batteries, respectively. n n n n features ? detecting a voltage drop in the ac adapter and dynamically controlling the charge current (dynamically-con- trolled charging) ? high efficiency : 95 % ? wide range of operating supply voltages : 7 v to 25 v ? output voltage precision (output voltage setting resistor integrated) : 0 0.8 % (ta = + 25 c) ? high precision reference voltage source : 4.2 v 0.8 % (continued) n n n n pac k ag e 24-pin plastic ssop (fpt-24p-m03)
MB3875/mb3877 2 (continued) ? support for frequency setting using an external resistor (frequency setting capacitor integrated) :100 khz to 500 khz ? on-chip current detector amplifier with wide in-phase input voltage range : 0 v to v cc ? on-chip standby current function : 0 m a (typ.) ? on-chip soft start function ? internal totem-pole output stage supporting p-channel mos fets devices
MB3875/mb3877 3 n n n n pin assignment (top view) (fpt-24p-m03) 1 2 3 4 5 6 7 8 9 10 11 12 - inc2 : in3 : fb2 : outc2 : vref : - ine2 : + ine2 : + ine1 : fb1 : outc1 : - ine1 : - inc1 : 24 23 22 21 20 19 18 17 16 15 14 13 : + inc2 : gnd : cs : v cc (o) : out : vh : v cc : rt : - ine3 : fb3 : ctl : + inc1
MB3875/mb3877 4 n n n n pin description pin no. symbol i/o descriptions 1 Cinc2 i current detection amplifier (current amp. 2) input pin. 2 in3 i dc/dc output voltage (charge voltage) input pin. 3 fb2 o error amplifier (error amp. 2) output pin. 4 outc2 o current detection amplifier (current amp. 2) output pin. 5 vref o reference voltage output pin. 6 Cine2 i error amplifier (error amp. 2) inverted input pin. 7 +ine2 i error amplifier (error amp. 2) non-inverted input pin. 8 +ine1 i error amplifier (error amp. 1) non-inverted input pin 9 fb1 o error amplifier (error amp. 1) output pin. 10 outc1 o current detection amplifier (current amp. 1) output pin. 11 Cine1 i error amplifier (error amp. 1) inverted input pin. 12 Cinc1 i current detection amplifier (current amp. 1) input pin. 13 +inc1 i current detection amplifier (current amp. 1) input pin. 14 ctl i power supply control pin. setting the ctl pin low places the ic in the standby mode. 15 fb3 o error amplifier (error amp. 3) output pin. 16 Cine3 i error amplifier (error amp. 3) inverted input pin. 17 rt triangular-wave oscillation frequency setting resistor connection pin. 18 v cc power supply pin for reference power supply and control circuit. 19 vh o power supply pin for fet drive circuit (vh = vcc - 5 v). 20 out o high-side fet gate drive pin. 21 v cc (o) output circuit power supply. 22 cs soft-start capacitor connection pin. 23 gnd ground pin. 24 +inc2 i current detection amplifier (current amp. 2) input pin .
MB3875/mb3877 5 + - - + 11 10 13 12 8 + - - + 6 4 24 1 7 25 25 + + + - 3 20 21 19 - + + + - 2 16 22 17 5 23 14 18 9 vref vref vref vref vref (4.2 v) r1 * r2 50 k w 1 m a 15 2.5 v 1.5 v [ drive v cc (v cc - 5 v) (v cc uvlo) v cc v cc v cc ctl 215 k w 35 k w 0.91 v (0.77 v) vref ulvo bias - inc2 in3 fb2 outc2 vref - ine2 + ine2 + ine1 fb1 outc1 - ine1 - inc1 + inc2 gnd cs v cc (o) out vh rt - ine3 fb3 + inc1 MB3875 100 k w mb3877 150 k w * : (45 pf) n n n n block diagram bias voltage block
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MB3875/mb3877 6 n n n n absolute maximum ragings *: the package is mounted on the dual-sided epoxy board (10 cm 10 cm). warning: semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. do not exceed these ratings. n n n n recommended operating conditions warning: the recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. all of the devices electrical characteristics are warranted when the device is operated within these ranges. always use semiconductor devices within their recommended operating condition ranges. operation outside these ranges may adversely affect reliability and could result in device failure. no warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. users considering application outside the listed conditions are advised to contact their fujitsu representatives beforehand. parameter symbol conditions rating unit min. max. power supply voltage v cc v cc ,v cc (o) 28 v output current i out 60ma peak output current i out duty 5% (t =1 / f osc duty) 500 ma power dissipation p d ta +25 c 740* mw storage temperature tstg C55 +125 c parameter symbol conditions value unit min. typ. max. power supply voltage v cc v cc ,v cc (o) 7 25 v reference voltage output current i ref C10ma vh pin output current i vh 030ma input voltage v in in3 0 17 v v ine Cine1,Cine2,+ine1,+ine2 0 v cc C 1.8 v v inc +inc1,+inc2,Cinc1,Cinc2, 0 v cc v ctl pin input voltage v ctl 025v output current i out C45 45 ma peak output current i out duty 5% (t =1 / f osc duty) C450 450 ma oscillator frequency f osc 100 290 500 khz timing resistor r t 3347130k w soft-start capacitor c s 2200 100000 pf vh pin capacitor c vh 0.11.0 m f reference voltage output capacitor c ref 0.11.0 m f operating temperature ta C30 +25 +85 c
MB3875/mb3877 7 n n n n electrical characteristics (MB3875 : ta = +25 c, v cc = 16 v, v cc (o) = 16 v, v ref = 0 ma) (mb3877 : ta = +25 c, v cc = 19 v, v cc (o) = 19 v, v ref = 0 ma) *: standard design value. (continued) parameter symbol pin no. conditions value unit remarks min. typ. max. output voltage v ref 5 ta = +25c 4.167 4.200 4.233 v ta = C30c to +85c 4.158 4.200 4.242 v input stability line 5 v cc = 7 v to 25 v 3 10 mv load stability load 5 vref = 0 ma to C1 ma 1 10 mv short-circuit output current i os 5 vref = 1 v C25 C15 C5 ma threshold voltage v tlh 18 v cc =v cc (o), v cc = 6.3 6.6 6.9 v v thl v cc =v cc (o), v cc = 5.3 5.6 5.9 v hysteresis width v h 18 v cc =v cc (o) 0.7 1.0 1.3 v threshold voltage v tlh 5 vref = 2.6 2.8 3.0 v v thl vref= 2.4 2.6 2.8 v hysteresis width v h 5 0.05 0.20 0.35 v charge current i cs 22 C1.3 C0.8 C0.5 m a oscillation frequency f osc 20 rt = 47 k w 260 290 320 khz frequency tem- perature stability d f/f dt 20 ta = C30c to +85c 1* % triangular waveform oscillator circuit block (osc) soft-start block (soft) under voltage lockout protection circuit block (uvlo) reference voltage block (ref)
MB3875/mb3877 8 (MB3875 : ta = +25 c, v cc = 16 v, v cc (o) = 16 v, v ref = 0 ma) (mb3877 : ta = +25 c, v cc = 19 v, v cc (o) = 19 v, v ref = 0 ma) *: standard design value. (continued) parameter symbol pin no conditions value unit remarks min. typ. max. input offset voltage v io 6,7,8,11 fb1 = fb2 = 2 v 1 5 mv input bias current i b 6,7,8,11 C100 C30 na common mode input voltage range v cm 6,7,8,11 0 v cc C1.8 v voltage gain a v 3,9 dc 100* db frequency bandwidth b w 3,9 a v = 0 db 2.0* mhz output voltage v fbh 3,9 3.9 4.1 v v fbl 3,9 20 200 mv output source current i source 3,9 fb1 = fb2 = 2 v C2.0 C0.6 ma output sink current i sink 3,9 fb1 = fb2 = 2 v 150 300 m a threshold voltage v th 2 fb3 = 2 v, ta = +25 c 12.500 12.600 12.700 v MB3875 16.666 16.800 16.934 v mb3877 fb3 = 2 v, ta = C30 c to +85 c 12.474 12.600 12.726 v MB3875 16.632 16.800 16.968 v mb3877 input current i ine3h 2 in3 = 12.6 v 84 150 m a MB3875 in3 = 16.8 v 84 150 m a mb3877 i ine3l 2 v cc = 0 v, in3 = 12.6 v 0 1 m a MB3875 v cc = 0 v, in3 = 16.8 v 0 1 m a mb3877 input resistor r 1 2 70 100 130 k w MB3875 105 150 195 k w mb3877 r 2 16 35 50 65 k w voltage gain a v 15 dc 100* db frequency bandwidth bw 15 a v = 0 db 2.0* mhz output voltage v fbh 15 3.9 4.1 v v fbl 15 20 200 mv output source current i source 15 fb3 = 2 v C2.0 C0.6 ma output sink current i sink 15 fb3 = 2 v 150 300 m a error amplifier block (error amp.3) error amplifier block (error amp.1, 2)
MB3875/mb3877 9 (MB3875 : ta = +25 c, v cc = 16 v, v cc (o) = 16 v, v ref = 0 ma) (mb3877 : ta = +25 c, v cc = 19 v, v cc (o) = 19 v, v ref = 0 ma) *: standard design value. (continued) parameter symbol pin no. conditions value unit remarks min. typ. max. input current i +inch 13, 24 +inc1= +inc2=12.7 v Cinc1= Cinc2=12.6 v 1020 m a MB3875 +inc1= +inc2=16.9 v Cinc1= Cinc2=16.8 v 1020 m a mb3877 i Cinch 1, 12 +inc1= +inc2=12.7 v Cinc1= Cinc2=12.6 v 0.10.2 m a MB3875 +inc1= +inc2=16.9 v Cinc1= Cinc2=16.8 v 0.10.2 m a mb3877 i +incl 13, 24 +inc1= +inc2= 0.1 v Cinc1= Cinc2= 0 v C130 C65 m a i Cincl 1, 12 +inc1= +inc2= 0.1v Cinc1= Cinc2= 0 v C140 C70 m a current detection voltage v outc1 4, 10 +inc1= +inc2=12.7 v Cinc1= Cinc2=12.6 v 2.25 2.5 2.75 v MB3875 +inc1= +inc2=16.9 v Cinc1= Cinc2=16.8 v 2.25 2.5 2.75 v mb3877 v outc2 4, 10 +inc1= +inc2=12.63v Cinc1= Cinc2=12.6 v 0.50 0.75 1.00 v MB3875 +inc1= +inc2=16.83v Cinc1= Cinc2=16.8 v 0.50 0.75 1.00 v mb3877 v outc3 4, 10 +inc1= +inc2= 0.1 v Cinc1= Cinc2= 0 v 1.25 2.50 3.75 v v outc4 4, 10 +inc1= +inc2= 0.03 v Cinc1= Cinc2= 0 v 0.125 0.750 1.375 v common mode input voltage range v cm 1, 12, 13, 24 0v cc v voltage gain a v 4, 10 +inc1= +inc2=12.7 v Cinc1= Cinc2=12.6 v 22.5 25 27.5 v/v MB3875 +inc1= +inc2=16.9 v Cinc1= Cinc2=16.8 v 22.5 25 27.5 v/v mb3877 frequency bandwidth bw 4, 10 a v = 0 db 2.0* mhz output voltage v outch 4, 10 3.9 4.1 v v outcl 4, 10 20 200 mv output source current i source 4, 10 outc1 = outc2 = 2 v C2.0 C0.6 ma output sink current i sink 4, 10 outc1 = outc2 = 2 v 150 300 m a current detection amplifier block (current amp.1,2)
MB3875/mb3877 10 (continued) (MB3875 : ta = +25 c, v cc = 16 v, v cc (o) = 16 v, v ref = 0ma) (mb3877 : ta = +25 c, v cc = 19 v, v cc (o) = 19 v, v ref = 0ma) *: standard design value. parameter symbol pin no. conditions value unit remarks min. typ. max. threshold voltage v tl 3,9,15 duty cycle = 0 % 1.4 1.5 v v th 3,9,15 duty cycle = 100 % 2.5 2.6 v output source current i source 20 out = 11 v duty 5 % (t = 1/fosc duty ) C200* ma MB3875 out = 14 v duty 5 % (t = 1/fosc duty ) C200* ma mb3877 output sink current i sink 20 out = 16 v duty 5 % (t = 1/fosc duty ) 200*ma MB3875 out = 19 v duty 5 % (t = 1/fosc duty ) 200*ma mb3877 output on resistor r oh 20 out = - 45 ma 8.0 16 w r ol 20 out = 45 ma 6.5 13 w rise time tr1 20 out = 3300 pf (equivalent to si4435dy) 70* ns fall time tf2 20 out = 3300 pf (equivalent to si4435dy) 60* ns ctl input voltage v on 14 active mode 225v v off 14 standby mode 00.8v input current i ctlh 14 ctl = 5 v 100 200 m a i ctll 14 ctl = 0 v 0 1 m a output voltage vh 19 v cc = v cc (o) = 7 v to 25 v, vh = 0 to 30 ma v cc C5.5 v cc C5.0 v cc C4.5 v standby current i ccs 18 v cc = v cc (o), ctl = 0 v 010 m a power supply current i cc 18 v cc = v cc (o), ctl = 5 v 6.09.0ma MB3875 6.59.5ma mb3877 general bias voltage block (vh) control block (ctl) output block (out) pwm comparator block (pwm comp.)
MB3875/mb3877 11 n n n n typical characteristics (continued) 10 8 6 4 2 0 0 5 10 15 20 25 ta = + 25 c v cc = 16 v (MB3875) v cc = 19 v (mb3877) vref = 0 ma power supply current i cc (ma) power supply voltage v cc (v) power supply current vs. power supply voltage power supply voltage v cc (v) reference voltage vs. power supply voltage reference voltage v ref (v) reference voltage v ref (v) reference voltage vs. vref load current reference voltage vs. ctl pin voltage reference voltage v ref (v) ctl pin voltage v ctl (v) control pin voltage v ctl (v) ctl pin current vs. ctl pin voltage ctl pin current i ctl ( m a) 10 8 6 4 2 0 0 5 10 15 20 25 ta = + 25 c ctl = 5 v ta = + 25 c ctl = 5 v vref = 0 ma 10 8 6 4 2 0 0 5 10 15 20 25 10 8 6 4 2 0 0 5 10 15 20 25 30 ta = + 25 c v cc = 16 v (MB3875) v cc = 19 v (mb3877) ctl = 5 v 2.0 1.5 1.0 0.5 0.0 - 0.5 - 1.0 - 1.5 - 2.0 - 40 - 20 0 20 40 60 80 100 v cc = 16 v (MB3875) v cc = 19 v (mb3877) ctl = 5 v vref = 0 ma 10 8 6 4 2 0 0 5 10 15 20 25 ta = + 25 c v cc = 16 v (MB3875) v cc = 19 v (mb3877) reference voltage vs. ambient temperature reference voltage d v ref (%) ambient temperature ta ( c) vref load current i ref (ma)
MB3875/mb3877 12 (continued) 1 m 100 k 10 k 10 k 100 k 1 m ta = + 25 c v cc = 16 v (MB3875) v cc = 19 v (mb3877) ctl = 5 v 350 340 330 320 310 300 290 280 270 260 250 0 5 10 15 20 25 ta = + 25 c ctl = 5 v rt = 47 k w triangular wave oscillator frequency vs. timing resistor triangular wave oscillator frequency f osc (hz) timing resistor r t ( w ) triangular wave oscillator frequency f osc (khz) triangular waveoscillator frequency vs. power supply voltage power supply voltage v cc (v) ambient temperature ta ( c) 350 340 330 320 310 300 290 280 270 260 250 - 40 - 20 0 20 40 60 80 100 v cc = 16 v (MB3875) v cc = 19 v (mb3877) ctl = 5 v rt = 47 k w 5.0 4.0 3.0 2.0 1.0 0.0 - 40 - 20 0 20 40 60 80 100 - 1.0 - 2.0 - 3.0 - 4.0 - 5.0 v cc = 16 v (MB3875) v cc = 19 v (mb3877) ctl = 5 v triangular wave oscillator frequency vs. ambient temperature triangular wave oscillator frequency f osc (khz) error amplifier threshold voltage vs. ambient temperature error amplifier threshold voltage d v th (%) ambient temperature ta ( c)
MB3875/mb3877 13 (continued) power dissipation vs. ambient temperature power dissipation p d (mw) ambient temperature ta ( c) error amplifier gain and phase vs. frequency gain a v (db) frequency f (hz) current detection amplifier gain and phase vs. frequency gain a v (db) frequency f (hz) ta = + 25 c f a v 40 20 0 - 20 - 40 100 1 k 10 k 100 k 1 m 10 m 180 90 0 - 90 - 180 v cc = 16 v (MB3875) v cc = 19 v (mb3877) - + - + 8 (7) (3) (6) 2.088 v 11 10 k w 2.4 k w 240 k w 10 k w 4.2 v 9 out in phase f (deg) + - 1 24 4 (13) (12) (10) 100 k w out 25 0.1 v * : MB3875 12.6 v mb3877 16.8 v current amp.2 (current amp.1) v cc = 16 v (MB3875) v cc = 19 v (mb3877) 40 20 0 100 1 k 10 k 100 k 1 m - 20 - 40 180 90 0 - 90 - 180 ta = + 25 c a v f * phase f (deg) 800 740 700 600 500 400 300 200 100 0 - 40 - 20 0 20 40 60 80 100
MB3875/mb3877 14 n n n n functional description 1. dc/dc converter unit (1) reference voltage block (ref) the reference voltage generator uses the voltage supplied from the vcc terminal (pin 18) to generate a temper- ature-compensated, stable voltage ( : = 4.2 v) used as the reference supply voltage for the ics internal circuitry. the reference voltage can be output, up to 1 ma, to an external device through the vref terminal (pin 5). (2) triangular wave oscillator block(osc) the triangular wave oscillator generates a triangular waveform with a frequency setting resistor connected to the internal frequency setting capacitor via the rt terminal (pin 17). the triangular wave is input to the pwm comparator on the ic. (3) error amplifier block (error amp. 1) this error amplifier (error amp. 1) detects a voltage drop in the ac adapter and outputs a pwm control signal. in addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the fb1 terminal (pin 9) to the -ine1 terminal (pin 11) of the error amplifier, enabling stable phase compensation to the system. (4) error amplifier block (error amp. 2) this error amplifier (error amp. 2) detects the output signal from the current detector amplifier (current amp. 2), compares it with the +ine2 terminal (pin 7), and outputs a pwm control signal to control the charge current. in addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the fb2 terminal (pin 3) to the -ine2 terminal (pin 6) of the error amplifier, enabling stable phase compensation to the system. (5) error amplifier block (error amp. 3) this error amplifier (error amp. 3) detects the output voltage from the dc/dc converter and outputs the pwm control signal. the error amplifier inverting input pin is connected to the output voltage setting resistor in the ic, eliminating the need for an external resistor for setting the output voltage. the MB3875 and mb3877 are set to output voltage of 12.6 v (for a 3-cell battery) and 16.8 v (for a 4-cell battery), respectively; these ics are suitable for use in equipment that uses a lithium-ion battery. in addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the fb3 terminal (pin 15) to the -ine3 terminal (pin 16) of the error amplifier, enabling stable phase compensation to the system. connecting a soft-start capacitor to the cs terminal (pin 22) prevents surge currents when the ic is turned on. using an error amplifier for soft start detection makes the soft start time constant, independent of the output load. (6) current detector amplifier block (current amp. 2) the current detection amplifier (current amp. 2) detects a voltage drop which occurs between both ends of the output sense resistor (rs) due to the flow of the charge current, using the +inc2 terminal (pin 24) and - inc2 terminal (pin 1). then it outputs the signal amplified by 25 times to the error amplifier (error amp. 2) at the next stage.
MB3875/mb3877 15 (7) pwm comparator block (pwm comp.) the pwm comparator circuit is a voltage-pulse width converter for controlling the output duty of the error amplifiers (error amp. 1 to error amp. 3) depending on their output voltage. the pwm comparator circuit compares the triangular wave generated by the triangular wave oscillator to the error amplifier output voltage and turns on the external output transistor during the interval in which the triangular wave voltage is lower than the error amplifier output voltage. (8) output block (out) the output circuit uses a totem-pole configuration capable of driving an external p-channel mos fet. the output l level sets the output amplitude to 5 v (typical) using the voltage generated by the bias voltage block (vh). this results in increasing conversion efficiency and suppressing the withstand voltage of the connected external transistor in a wide range of input voltages. (9) control block (ctl) setting the ctl terminal (pin 14) low places the ic in the standby mode. (the supply current is 10 m a at maximum in the standby mode.) (10) bias voltage block (vh) the bias voltage circuit outputs vcc - 5 v (typical) as the minimum potential of the output circuit. in the standby mode, this circuit outputs the potential equal to vcc. 2. protection functions low-vcc malfunction preventive circuit (uvlo) the transient state or a momentary decrease in supply voltage or internal reference voltage (vref), which occurs when the power supply is turned on, may cause malfunctions in the control ic, resulting in breakdown or degradation of the system. to prevent such malfunction, the low-vcc malfunction preventive circuit detects a supply voltage or internal reference voltage drop and fixes the out terminal (pin 20) to the h level. the system restores voltage supply when the supply voltage or internal reference voltage reaches the threshold voltage of the low-vcc malfunction preventive circuit. 3. soft start function soft start block (soft) connecting a capacitor to the cs terminal (pin 22) prevents surge currents when the ic is turned on. using an error amplifier for soft start detection makes the soft start time constant, independent of the output load of the dc/dc converter.
MB3875/mb3877 16 n n n n method of setting the charging current the charge current (output control current) value can be set with the voltage at the +ine2 terminal. if a current exceeding the set value attempts to flow, the charge voltage drops according to the set current value. battery charge current setting voltage +ine2 (v) = 25 i1 (a) r s ( w ) n n n n method of setting the soft start time upon activation, the ic starts charging the capacitor (cs) connected to the cs terminal (pin 22). the error amplifier causes soft start operation to be performed with the output voltage in proportion to the cs pin voltage regardless of the load current of the dc/dc converter. soft start time ts (time taken for the output voltage to reach 100 %) ts (s) : = 4.2 c s ( m f) n n n n method of setting the triangular wave oscillator frequency setting the trianguar wave oscillator frequency can be set by the timing resistor (r t ) connected the rt terminal (pin 17). triangular wave oscillator frequency f osc f osc (khz) : = 14444 / r t (k w )
MB3875/mb3877 17 n n n n ac adapter voltage detection with an external resistor connected to the +ine1 terminal, the ic enters the dynamically-controlled charging mode to reduce the charge current to keep ac adapter power constant when the partial potential point a of the ac adapter voltage (vcc) becomes lower than the voltage at the -ine1 terminal. ac adapter detected voltage setting vth vth (v) = (r1 + r2) / r2 - ine1 - ine1 setting voltage range : 1.176 v to 4.2 v (equivalent to 7 v to 25 v for vcc) n n n n operation timing diagram - + 11 8 v cc r1 r2 + ine1 - ine1 a 2.5 v 1.5 v error amp.2 error amp.3 error amp.1 fb2 fb3 fb1 out constant voltage control ac adapter dynamically- controlled charging constant current control ac adapter dynamically- controlled charging
MB3875/mb3877 18 n n n n note on an external reverse-currentpreventive diode insert a reverse-current preventive diode (d) at one of the three locations marked * to prevent reverse current from the battery. pay attention to the voltage/current characteristics of the reverse-current preventive diode (d) not to let it exceed the overcharge stop voltage. v cc (o) out vin (16 v/19 v) vh i1 r s batt 12.6 v/16.8 v 20 21 19 a b * d d * d * battery 1
MB3875/mb3877 19 n n n n application example + - - + + - - + 25 25 + + + - - + + + - vref vref vref vref vref (4.2 v) * 1 50 k w 1 m a 2.5 v 1.5 v [ drive v cc (v cc - 5 v) (v cc uvlo) v cc v cc v cc ctl 215 k w 35 k w 0.91 v (0.77 v) vref ulvo bias - inc2 in3 fb2 vref - ine2 + ine1 fb1 outc1 - ine1 - inc1 + inc2 gnd cs v cc (o) out vh rt r t - ine3 fb3 + inc1 MB3875 mb3877 vin = 16 v vin = 19 v MB3875 mb3877 MB3875 mb3877 100 k w 150 k w 0 w 82 k w 16 v/19 v 19 v 12.6 v 16.8 v * 1 : * 2 : * 3 : * 4 : + - + - + - 11 10 13 12 8 9 150 k w r9 100 k w r8 c10 3900 pf c8 3900 pf r10 22 k w r4 * 2 r5 330 k w r6 68 k w r11 30 k w 6 4 24 1 7 outc2 a b + ine2 r12 22 k w r14 1.3 k w r16 200 k w vin * 3 q2 sw1 30 k w r13 110 w r15 200 k w r3 c6 3900 pf c s 2200 pf 150 k w r7 3 2 16 22 15 5 23 (45 pf) 47 k w c9 0.1 m f c7 0.1 m f 17 14 18 c5 0.1 m f c1 22 m f c2 100 m f c3 100 m f q1 l1 27 m h r s batt * 4 0.033 w d1 20 21 19 a b bias voltage block battery
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MB3875/mb3877 20 n n n n parts list note: vishay siliconix : vishay intertechrology, inc. motorola : motorola japan ltd. sumida : sumida electric co., ltd. componet item specification vendor parts no. qi q2 fet fet si4435dy 2n7002 vishay siliconix vishay siliconix si4435dy 2n7002 d1 diode mbrs130lt3 motorola mbrs130lt3 l1 coil 27 m h 3.4a, 34m w sumida cdrh127-27uh c1 c2 c3 c s c5 c6 c7 c8 c9 c10 os condensor os condensor os condensor ceramics condensor ceramics condensor ceramics condensor ceramics condensor ceramics condensor ceramics condensor ceramics condensor 22 m f 100 m f 100 m f 2200pf 0.1 m f 3900pf 0.1pf 3900pf 0.1 m f 3900pf 25v(10%) 16v(10%) 25v(10%) 16v(10%) 25v(10%) 10% 16v 10% 25v 10% 16v 10% r s r t r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15 r16 resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor 0.033 w 47k w 200k w 0 w 82k w 330k w 68k w 150k w 100k w 150k w 22k w 30k w 22k w 30k w 1.3k w 110 w 200k w 1.0% 1.0% 1.0% jumper line 0.5% 0.5% 0.5% 1.0% 1.0% 1.0% 0.5% 0.5% 0.5% 0.5% 0.5% 0.5% 5%
MB3875/mb3877 21 n n n n reference data ? MB3875 note: kikusui : kikusui electronics corp. vin = 16 v vin = 19 v 10 m 100 m 1 10 100 98 96 94 92 90 88 86 84 82 80 vin = 16 v r4 = 0 w vin = 19 v r4 = 82 k w 100 98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 10121416 dead battery mode dcc mode dcc : dynamically-controlled charging 0 18 16 14 12 10 8 6 4 2 0 12345 dead battery mode dcc mode dcc : dynamically-controlled charging 0 18 16 14 12 10 8 6 4 2 0 12345 conversion efficiency vs. charge current (fixed voltage mode) conversion efficiency vs. charge voltage (fixed current mode) batt charge current i batt (a) conversion efficiency h( %) batt charge voltage=12.6v f osc =288.78khz efficiency h( %)=(v batt i batt )/(vin iin) 100 conversion effciency h( %) batt= electronic load (product of kikusui plz-150w) batt charge voltage v batt (v) batt voltage vs. batt charge current batt voltage vs. batt charge current batt voltage v batt (v) batt voltage v batt (v) batt charge current i batt (a) batt charge current i batt (a) vin=16v batt: electronic load (product of kikusui plz-150w) vin=19v batt:electronic load (product of kikusui plz-150w)
MB3875/mb3877 22 (continued) 20 15 10 5 0 20 15 10 5 0 0 80 120 160 200 t (ms) 40 batt (v) ctl (v) 5 v 5 v 20 ms 20 15 046810 t ( m s) 2 10 5 0 - 5 out (v) 1 m s 5 v 20 15 10 5 0 20 15 10 5 0 0 80 120 160 200 t (ms) 40 batt (v) ctl (v) 5 v 5 v 20 ms 20 15 046810 t ( m s) 2 10 5 0 - 5 out (v) 1 m s 5 v soft start operating waveforms vin = 16 v load : batt = 20 w - ine1 = 0 v dc/dc converter switching waveforms vin = 16 v f osc = 288.8 khz load : batt = 2a soft start operating waveforms vin = 19 v load : batt = 20 w - ine1 = 0 v dc/dc converter switching waveforms vin = 19 v f osc = 288.8 khz load : batt = 2a
MB3875/mb3877 23 ? mb3877 note: kikusui : kikusui electronics corp. vin = 19 v 100 98 96 94 92 90 88 86 84 82 80 10 m 100 m 1 10 100 98 96 94 92 90 88 86 84 82 80 024681012141618 vin = 19 v r4 = 82 k w dead battery mode dcc mode dcc : dynamically-controlled charging 0 0 2 4 6 8 10 12 14 16 18 20 12345 conversion efficiency vs.charge current batt charge current i batt (a) conversion efficiency h( %) batt charge voltage=12.6v f osc =288.78khz efficiency h( %)=(v batt i batt )/(vin iin) 100 conversion efficiency vs. charge voltage conversion efficiency h( %) batt= electronic load (prouct of kikusui plz-150w) batt charge voltage v batt (v) batt voltage vs. batt charge current batt voltage v batt (v) batt charge current i batt (a) vin=19v batt:electronic load (product of kikusui plz-150w)
MB3875/mb3877 24 (continued) 20 10 0 0 80 120 160 200 t (ms) 40 batt (v) 20 15 10 5 0 ctl (v) 10 v 5 v 20 ms 20 15 046810 t ( m s) 2 10 5 0 - 5 out (v) 1 m s 5 v soft start operating waveforms vin = 19 v load : batt = 50 w - ine1 = 0 v dc/dc converter switching waveforms vin = 19 v f osc = 287.4 khz load : batt = 2 a
MB3875/mb3877 25 n nn n usage precautions 1. never use settings exceeding maximum rated conditions. exceeding maximum rated conditions may cause permanent damage to the lsi. also, it is recommended that recommended operating conditions be observed in normal use. exceeding recommended operating conditions may adversely affect lsi reliability. 2. use this device within recommended operating conditions. recommended operating conditions are values within which normal lsi operation is warranted. standard elec- trical characteristics are warranted within the range of recommended operating conditions and within the listed conditions for each parameter. 3. printed circuit board ground lines should be set up with consideration for common imped- ance. 4. take appropriate static electricity measures. ? containers for semiconductor materials should have anti-static protection or be made of conductive material. ? after mounting, printed circuit boards should be stored and shipped in conductive bags or containers. ? work platforms, tools, and instruments should be properly grounded. ? working personnel should be grounded with resistance of 250 k w to 1 m w between body and ground. n nn n ordering information part number package remarks MB3875pfv mb3877pfv 24-pin plastic ssop (fpt-24p-m03)
MB3875/mb3877 26 n nn n package dimension 24-pin plastic ssop (fpt-24p-m03) dimensions in mm (inches) c 1994 fujitsu limited f24018s-2c-2 0.50?.20 (.020?008) 0.10?.10(.004?004) (stand off) 0 10 details of "a" part 7.75?.10(.305?004) 0.65?.12(.0256?0047) 7.15(.281)ref 6.60(.260) 5.60?.10 nom 7.60?.20 (.220?004) (.299?008) "a" .006 ?001 +.002 ?.02 +0.05 0.15 .049 ?004 +.008 ?.10 + 0 . 20 1.25 .009 ?002 +.004 ?.05 +0.10 0.22 0.10(.004) index * * (mounting height) c 1994 fujitsu limited f24018s-2c-2 0.50?.20 (.020?008) 0.10?.10(.004?004) (stand off) 0 10 details of "a" part 7.75?.10(.305?004) 0.65?.12(.0256?0047) 7.15(.281)ref 6.60(.260) 5.60?.10 nom 7.60?.20 (.220?004) (.299?008) "a" .006 ?001 +.002 ?.02 +0.05 0.15 .049 ?004 +.008 ?.10 +0.20 1.25 .009 ?002 +.004 ?.05 +0.10 0.22 0.10(.004) index * * (mounting height) * :these dimensions do not include resin protrusion.
MB3875/mb3877 fujitsu limited for further information please contact: japan fujitsu limited corporate global business support division electronic devices kawasaki plant, 4-1-1, kamikodanaka nakahara-ku, kawasaki-shi kanagawa 211-8588, japan tel: 81(44) 754-3763 fax: 81(44) 754-3329 http://www.fujitsu.co.jp/ north and south america fujitsu microelectronics, inc. semiconductor division 3545 north first street san jose, ca 95134-1804, usa tel: (408) 922-9000 fax: (408) 922-9179 customer response center mon. - fri.: 7 am - 5 pm (pst) tel: (800) 866-8608 fax: (408) 922-9179 http://www.fujitsumicro.com/ europe fujitsu microelectronics europe gmbh am siebenstein 6-10 d-63303 dreieich-buchschlag germany tel: (06103) 690-0 fax: (06103) 690-122 http://www.fujitsu-fme.com/ asia pacific fujitsu microelectronics asia pte ltd #05-08, 151 lorong chuan new tech park singapore 556741 tel: (65) 281-0770 fax: (65) 281-0220 http://www.fmap.com.sg/ f0001 ? fujitsu limited printed in japan all rights reserved. the contents of this document are subject to change without notice. customers are advised to consult with fujitsu sales representatives before ordering. the information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. also, fujitsu is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. fujitsu semiconductor devices are intended for use in standard applications (computers, office automation and other office equipment, industrial, communications, and measurement equipment, personal or household devices, etc.). caution: customers considering the use of our products in special applications where failure or abnormal operation may directly affect human lives or cause physical injury or property damage, or where extremely high levels of reliability are demanded (such as aerospace systems, atomic energy controls, sea floor repeaters, vehicle operating controls, medical devices for life support, etc.) are requested to consult with fujitsu sales representatives before such use. the company will not be responsible for damages arising from such use without prior approval. any semiconductor devices have an inherent chance of failure. you must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. if any products described in this document represent goods or technologies subject to certain restrictions on export under the foreign exchange and foreign trade law of japan, the prior authorization by japanese government will be required for export of those products from japan.
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