Instruction/ maintenance manual of the product MB3887 Fujitsu
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DS04-27709-3E FUJITSU SEMICONDUCT OR DA T A S H E E T ASSP F or P o wer Supply Applications (Secondar y batter y) DC/DC Con ver ter IC f or Char ging Li-ion batter y MB3887 ■ DESCRIPTION The MB3887 .
MB3887 2 (Continued) • Output v oltage setting using external resistor : 1 cell to 4 cells • High efficiency : 96 % (VIN = 19 V, V o = 16.8 V) • Wide range of oper ating supply v oltages : 8 V to 25 V • Output v oltage setting accuracy : 4.2 V ± 0.
MB3887 3 ■ PIN ASSIGNMENT (TOP VIEW) (FPT-24P-M03) 1 2 3 4 5 6 7 8 9 10 11 12 − INC2 : OUTC2 : + INE2 : − INE2 : FB2 : VREF : FB1 : − INE1 : + INE1 : OUTC1 : OUTD : − INC1 : 24 23 22 21 20 1.
MB3887 4 ■ PIN DESCRIPTION Pin No. Symbol I/O Descriptions 1 − INC2 I Current detection amplifier (Current Amp2) input terminal. 2 OUTC2 O Current detection amplifier (Current Amp2) output terminal. 3 + INE2 I Error amplifier (Error Amp2) non-inverted input terminal.
MB3887 5 ■ BLOCK DIA GRAM + − − + 8 10 13 12 9 + − − + 4 2 24 1 3 × 20 × 20 + + + − 5 20 21 19 − + + + − 11 16 22 17 6 23 14 18 <Current Amp1> <Error Amp1> 7 VREF <Current Amp2> <Error Amp2> VREF <Error Amp3> VREF VREF VREF 5.
MB3887 6 ■ ABSOLUTE MAXIMUM RA TINGS * : The package is mounted on the dual-sided epo xy board (10 cm × 10 cm) . W ARNING: Semiconductor de vices can be per manently damaged by application of stress (v oltage, current, temperature , etc.) in e xcess of absolute maximum ratings.
MB3887 7 ■ RECOMMENDED OPERA TING CONDITIONS W ARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor de vice. All of the de vice’ s electr ical characteristics are warranted when the de vice is operated within these ra nges.
MB3887 8 ■ ELECTRICAL CHARA CTERISTICS (T a = + 25 ° C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design v alue. (Continued) Pa r a m e t e r Sym- bol Pin No. Conditions Va l u e Unit Min T yp Max 1. Reference voltage block [REF] Output voltage V REF1 6T a = + 25 ° C 4.
MB3887 9 (T a = + 25 ° C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design v alue (Continued) Pa r a m e t e r Sym- bol Pin No. Conditions Va l u e Unit Min T yp Max 5-2. Error amplifier block [Error Amp3] Threshold voltage V TH1 16 FB3 = 2 V, Ta = + 25 ° C 4.
MB3887 10 (T a = + 25 ° C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design v alue (Continued) Pa r a m e t e r Sym- bol Pin No. Conditions Va l u e Unit Min T yp Max 6. Current detection amplifier block [Current Amp1, Current Amp2] Current detection voltage V OUTC1 2, 10 + INC1 = + INC2 = 3 V to VCC, ∆ Vin = − 100 mV 1.
MB3887 11 (Continued) (T a = + 25 ° C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design v alue Pa r a m e t e r Sym- bol Pin No. Conditions Va l u e Unit Min T yp Max 8.
MB3887 12 ■ TYPICAL CHARA CTERISTICS (Continued) 6 5 4 3 2 1 0 0 5 10 15 20 25 Ta = + 25 ° C CTL = 5 V 6 5 4 3 2 1 0 0 5 10 15 20 25 Ta = + 25 ° C CTL = 5 V VREF = 0 mA 6 5 4 3 2 1 0 0 5 10 15 20 25 30 Ta = + 25 ° C VCC = 19 V CTL = 5 V 5.08 5.06 5.
MB3887 13 (Continued) 1 M 100 k 10 k 10 100 1000 Ta = + 25 ° C VCC = 19 V CTL = 5 V 340 330 320 310 300 290 280 270 260 0 5 10 15 20 25 Ta = + 25 ° C CTL = 5 V RT = 47 k Ω 320 315 310 305 300 295 290 285 280 275 270 265 260 − 40 − 20 0 20 40 60 80 100 VCC = 19 V CTL = 5 V RT = 47 k Ω 4.
MB3887 14 (Continued) − + 7 8 9 + OUT IN (5) (4) (3) 240 k Ω 2.4 k Ω 10 k Ω 10 k Ω 10 k Ω 10 k Ω Error Amp1 (Error Amp2) 4.2 V VCC = 19 V 1 µ F Ta = + 25 ° C A V φ 40 20 0 − 20 − 40 180 90 0 − 90 − 180 1 k 10 k 100 k 1 M 10 M − + + 15 16 22 + OUT IN 240 k Ω 2.
MB3887 15 (Continued) 800 700 600 500 400 300 200 100 0 740 − 40 − 20 0 20 40 60 80 100 Power dissipation vs. Ambient temperature Power dissipation P D (mW) Ambient temperature Ta ( ° C).
MB3887 16 ■ FUNCTIONAL DESCRIPTION 1. DC/DC Con ver ter Unit (1) Reference v oltage bloc k (Ref) The ref erence voltage generator uses the v oltage supplied from the VCC ter minal (pin 18) to generate a tem- perature-compensated, stab le voltage (5.
MB3887 17 (7) PWM comparator bloc k (PWM Comp.) The PWM comparator circuit is a v oltage-pulse width conv er ter f or controlling the output duty of the error amplifiers (Error Amp1 to Error Amp3) depending on their output v oltage.
MB3887 18 3. Soft-Star t Function Soft-start block (SOFT) Connecting a capacitor to the CS ter minal (pin 22) pre v ents r ush currents when the IC is tur ned on. Using an error amplifier f or soft-star t detection makes the soft-star t time constant, being independent of the output load of the DC/DC conv er ter .
MB3887 19 ■ METHOD OF SETTING THE SOFT -ST ART TIME F or pre venting rush current upon activation of IC, the IC allo ws soft-star t using the capacitor (Cs) connected to the CS ter minal (pin 22) .
MB3887 20 ■ A C AD APT OR V OL T A GE DETECTION • With an e xter nal resistor connected to the + INE2 ter minal (pin 3) , the IC enters the dynamically-controlled charging mode to reduce the charg.
MB3887 21 ■ PR OCESSING WITHOUT USING THE CURRENT AMP When Current Amp is not used, connect the + INC1 ter minal (pin 13) , + INC2 ter minal (pin 24) , − INC1 ter minal (pin 12) , and − INC2 ter minal (pin 1) to VREF, and then lea ve OUTC1 terminal (pin 10) and OUTC2 ter minal (pin 2) open.
MB3887 22 ■ PR OCESSING WITHOUT USING OF THE ERROR AMP When Error Amp is not used, leav e FB1 ter minal (pin 7) , FB2 ter minal (pin 5) open and connect the − INE1 ter minal (pin 8) and − INE2 ter minal (pin 4) to GND and connect + INE1 ter minal (pin 9) , and + INE2 ter minal (pin 3) , to VREF .
MB3887 23 ■ PR OCESSING WITHOUT USING OF THE CS TERMINAL When soft-star t function is not used, leav e the CS ter minal (pin 22) open. ■ NO TE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE • Inser t a rev erse-current prev entive diode at one of the three locations marked * to pre v ent re verse current from the batter y .
MB3887 24 ■ APPLICA TION EXAMPLE A B Q1 Output voltage (Battery voltage) is adjustable D1 I1 Battery R8 100 k Ω C10 5600 pF + + + R9 10 k Ω R14 1 k Ω R10 30 k Ω R11 30 k Ω R7 22 k Ω R18 200 k Ω R19 100 k Ω R17 100 k Ω C6 1500 pF C4 0.
MB3887 25 ■ P ARTS LIST Note : VISHA Y SILICONIX : VISHA Y Inter technolog y , Inc. ROHM : R OHM CO ., L TD . TDK : TDK Cor poration SANY O : SANY O Electric Co ., Ltd. KY OCERA : K yocera Corporation MURA T A : Murata Man u f actur ing Co ., Ltd. SEIDEN TECHNO : SEIDEN TECHNO CO .
MB3887 26 ■ REFERENCE D A T A (Continued) 100 98 96 94 92 90 88 86 84 82 80 10 m 100 m 1 10 Ta = + 25 ° C VIN = 19 V BA TT charge voltage = set at 12.6 V SW = ON Efficiency η (%) = (V BA TT × I BA TT ) / (V IN × I IN ) × 100 100 98 96 94 92 90 88 86 84 82 80 02 46 8 1 0 1 2 1 4 1 6 Ta = + 25 ° C VIN = 19 V BA TT charge voltage = set at 12.
MB3887 27 (Continued) 100 98 96 94 92 90 88 86 84 82 80 10 m 100 m 1 10 Ta = + 25 ° C VIN = 19 V BA TT charge voltage = set at 16.8 V SW = ON Efficiency η (%) = (V BA TT × I BA TT ) / (V IN × I IN ) × 100 100 98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 1 0 1 21 4 1 6 1 82 0 Ta = + 25 ° C VIN = 19 V BA TT charge voltage = set at 16.
MB3887 28 (Continued) 100 0 − 100 15 10 5 0 V BA TT (mV) V D (V) Ta = + 25 ° C VIN = 19 V BA TT = 1.5 A 98 mVp-p 012345 6 7 8 9 1 0 ( µ s) V D V BA TT 100 0 − 100 15 10 5 0 V BA TT (mV) V D (V) Ta = + 25 ° C VIN = 19 V BA TT = 3.
MB3887 29 (Continued) 20 10 0 4 2 0 5 0 V CTL (V) V CS (V) V BA TT (V) 0 2 4 6 8 1 01 21 41 61 82 0 (ms) Ta = + 25 ° C, VIN = 19 V BA TT = 12 Ω V BA TT V CTL ts = 10.
MB3887 30 ■ USA GE PRECA UTIONS • Printed circuit board ground lines should be set up with consideration f or common impedance. • T ake appropriate static electr icity measures. • Containers f or semiconductor mater ials should hav e anti-static protection or be made of conductive material.
MB3887 31 ■ P A CKA GE DIMENSION 24-pin plastic SSOP (FPT-24P-M03) Note1: Pins width and pins thickness include plating thickness. Note2: * This dimension does not include resin protrusion. Dimensions in mm (inches) . C 2001 FUJITSU LIMITED F24018S-c-3-4 7.
MB3887 FUJITSU LIMITED 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.
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