Fujitsu MB3887 - Manual

Fujitsu MB3887

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Table of Contents:

  • Page 3 – PIN ASSIGNMENT
  • Page 4 – PIN DESCRIPTION; Symbol
  • Page 5 – BLOCK DIAGRAM
  • Page 6 – ABSOLUTE MAXIMUM RATINGS
  • Page 7 – RECOMMENDED OPERATING CONDITIONS
  • Page 8 – ELECTRICAL CHARACTERISTICS
  • Page 12 – TYPICAL CHARACTERISTICS
  • Page 16 – FUNCTIONAL DESCRIPTION; The triangular wave is input to the PWM comparator on the IC.
  • Page 17 – mode, this circuit outputs the potential equal to VCC.; Protection Functions; ON
  • 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
  • Page 19 – METHOD OF SETTING THE SOFT-START TIME; INE3 terminal
  • Page 21 – PROCESSING WITHOUT USING THE CURRENT AMP; When Current Amp is not used, connect the; “Open”; Connection when Current Amp is not used
  • Page 22 – PROCESSING WITHOUT USING OF THE ERROR AMP; INE2 terminal (pin 4) to GND and connect; Connection when Error Amp is not used
  • Page 23 – Connection when soft-start time is not specified
  • Page 24 – APPLICATION EXAMPLE; VIN; Set output voltage so
  • Page 25 – PARTS LIST; COMPONENT
  • Page 26 – REFERENCE DATA; Conversion efficiency; Conversion efficiency
  • Page 27 – BATT voltage V
  • Page 28 – Switching waveform constant voltage mode
  • Page 30 – Part number
  • Page 31 – PACKAGE DIMENSION
  • Page 32 – FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan
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DS04-27709-3E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications (Secondary battery)

DC/DC Converter IC
for Charging Li-ion battery

MB3887

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DESCRIPTION

The MB3887 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and
enabling output voltage to be set to any desired level from one cell to four cells.
These ICs can dynamically control the secondary battery’s 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.

The MB3887 provides a broad power supply voltage range and low standby current as well as high efficiency,
making it ideal for use as a built-in charging device in products such as notebook PC.
This product is covered by US Patent Number 6,147,477.

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FEATURES

• Detecting a voltage drop in the AC adapter and dynamically controlling the charge current

(Dynamically-controlled charging)

(Continued)

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PACKAGE

24-pin plastic SSOP

(FPT-24P-M03)

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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...

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