Fujitsu MB3887 - Manuals

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Manual

Manual Fujitsu MB3887

Summary

Page 3 - PIN ASSIGNMENT

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 19 18 17 16 15 14 13 : + INC2 : GND : CS : VCC (O) : OUT : VH : VCC : RT : − INE3 : FB3 : CTL : + INC1

Page 4 - PIN DESCRIPTION; Symbol

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. 4 − INE2 I Error amplifier (Erro...

Page 5 - BLOCK DIAGRAM

MB3887 5 ■ BLOCK DIAGRAM + − − + 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 VREF5.0 V 4.2 V 10 µ A 15 <SOFT> 2.5 V1.5 V &l...

Page 6 - ABSOLUTE MAXIMUM RATINGS

MB3887 6 ■ ABSOLUTE MAXIMUM RATINGS * : 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. ...

Page 7 - RECOMMENDED OPERATING CONDITIONS

MB3887 7 ■ RECOMMENDED OPERATING CONDITIONS WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device’s electrical characteristics are warranted when the device isoperated within these ranges. Always use semicond...

Page 8 - ELECTRICAL CHARACTERISTICS

MB3887 8 ■ ELECTRICAL CHARACTERISTICS (Ta = + 25 ° C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design value. (Continued) Parameter Sym- bol Pin No. Conditions Value Unit Min Typ Max 1.Reference voltage block[REF] Output voltage V REF1 6 Ta = + 25 ° C 4.967 5.000 5.041 V V REF2 6 Ta = − ...

Page 12 - TYPICAL CHARACTERISTICS

MB3887 12 ■ TYPICAL CHARACTERISTICS (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 5.04 5.02 5.00 4.98 4.96 4.94 4.92 − 40 − 20 0 20 40 6...

Page 16 - FUNCTIONAL DESCRIPTION; The triangular wave is input to the PWM comparator on the IC.

MB3887 16 ■ 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 tem-perature-compensated, stable voltage (5.0 V Typ) used as the reference supply voltage for the IC’s i...

Page 17 - mode, this circuit outputs the potential equal to VCC.; Protection Functions; ON

MB3887 17 (7) PWM comparator block (PWM Comp.) The PWM comparator circuit is a voltage-pulse width conver ter for controlling the output duty of the erroramplifiers (Error Amp1 to Error Amp3) depending on their output voltage. The PWM comparator circuit compares the triangular wave generated by the ...

Page 18 - SETTING THE CHARGING VOLTAGE; Battery charging voltage : V; METHOD OF SETTING THE CHARGING CURRENT; Battery charge current setting voltage :; METHOD OF SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY; Triangular wave oscillation frequency : f

MB3887 18 3. Soft-Start Function Soft-start block (SOFT) Connecting a capacitor to the CS terminal (pin 22) prevents rush currents when the IC is turned on. Using anerror amplifier for soft-start detection makes the soft-star t time constant, being independent of the output loadof the DC/DC converte...

Page 19 - METHOD OF SETTING THE SOFT-START TIME; INE3 terminal

MB3887 19 ■ METHOD OF SETTING THE SOFT-START TIME For preventing rush current upon activation of IC, the IC allows soft-star t using the capacitor (Cs) connected tothe CS terminal (pin 22) . When CTL terminal (pin 14) is placed under “H” level and IC is activated (V CC ≥ UVLO threshold voltage) , Q2...

Page 21 - PROCESSING WITHOUT USING THE CURRENT AMP; When Current Amp is not used, connect the; “Open”; Connection when Current Amp is not used

MB3887 21 ■ PROCESSING WITHOUT USING THE CURRENT AMP When Current Amp is not used, connect the + INC1 terminal (pin 13) , + INC2 terminal (pin 24) , − INC1 terminal (pin 12) , and − INC2 terminal (pin 1) to VREF, and then leave OUTC1 terminal (pin 10) and OUTC2 terminal (pin 2) open. 24 13 12 1 2 10...

Page 22 - PROCESSING WITHOUT USING OF THE ERROR AMP; INE2 terminal (pin 4) to GND and connect; Connection when Error Amp is not used

MB3887 22 ■ PROCESSING WITHOUT USING OF THE ERROR AMP When Error Amp is not used, leave FB1 terminal (pin 7) , FB2 terminal (pin 5) open and connect the − INE1 terminal (pin 8) and − INE2 terminal (pin 4) to GND and connect + INE1 terminal (pin 9) , and + INE2 terminal (pin 3) , to VREF. 9 5 8 4 7 +...

Page 23 - Connection when soft-start time is not specified

MB3887 23 ■ PROCESSING WITHOUT USING OF THE CS TERMINAL When soft-star t function is not used, leave the CS terminal (pin 22) open. ■ NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE • Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current fro...

Page 24 - APPLICATION EXAMPLE; VIN; Set output voltage so

MB3887 24 ■ APPLICATION 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 0.022 µ F R3 330 k Ω R2 47 k Ω C9 0.1 µ F C7 0.1 µ F C5 0.1 µ F C2 10...

Page 25 - PARTS LIST; COMPONENT

MB3887 25 ■ PARTS LIST Note : VISHAY SILICONIX : VISHAY Inter technology, Inc. ROHM : ROHM CO., LTD.TDK : TDK CorporationSANYO : SANYO Electric Co., Ltd.KYOCERA : Kyocera CorporationMURATA : Murata Manufacturing Co., Ltd. SEIDEN TECHNO : SEIDEN TECHNO CO., LTD.KOA : KOA Corporationssm : SUSUMU Co., ...

Page 26 - REFERENCE DATA; Conversion efficiency; Conversion efficiency

MB3887 26 ■ REFERENCE DATA (Continued) 100 98 96 94 92 90 88 86 84 82 80 10 m 100 m 1 10 Ta = + 25 ° C VIN = 19 V BATT charge voltage = set at 12.6 VSW = ON Efficiency η (%) = (V BATT × I BATT ) / (V IN × I IN ) × 100 100 98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 10 12 14 16 Ta = + 25 ° C VIN = 19 V B...

Page 27 - BATT voltage V

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 BATT charge voltage = set at 16.8 VSW = ON Efficiency η (%) = (V BATT × I BATT ) / (V IN × I IN ) × 100 100 98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 10 12 14 16 18 20 Ta = + 25 ° C VIN = 19 V BATT charge ...

Page 28 - Switching waveform constant voltage mode

MB3887 28 (Continued) 100 0 − 100 15 10 5 0 V BATT (mV) V D (V) Ta = + 25 ° C VIN = 19 V BATT = 1.5 A 98 mVp-p 0 1 2 3 4 5 6 7 8 9 10 ( µ s) V D V BATT 100 0 − 100 15 10 5 0 V BATT (mV) V D (V) Ta = + 25 ° C VIN = 19 V BATT = 3.0 A 98 mVp-p V D V BATT 0 1 2 3 4 5 6 7 8 9 10 ( µ s) 100 0 − 100 15 10 ...

Page 30 - Part number

MB3887 30 ■ USAGE PRECAUTIONS • Printed circuit board ground lines should be set up with consideration for common impedance. • Take appropriate static electricity measures. • Containers for semiconductor materials should have anti-static protection or be made of conductive material. • After mounting...

Page 31 - PACKAGE DIMENSION

MB3887 31 ■ PACKAGE 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 7.75±0.10(.305±.004) 5.60±0.10 7.60±0.20 (.220±.0...

Page 32 - FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan

MB3887 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU salesrepresentatives before ordering. The information and circuit diagrams in this document arepresented as examples of semiconductor device a...