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MB3887 manual
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Contents
Main
DS04-27709-3E
FUJITSU SEMICONDUCTOR DATA SHEET
ASSP For P ow er Supply Applications (Secondary battery)
MB3887
DESCRIPTION
FEATURES
PAC KA GE
Page
MB3887
PIN ASSIGNMENT
(TOP VIEW)
(FPT-24P-M03)
PIN DESCRIPTION
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
MB3887
RECOMMENDED OPERATING CONDITIONS
MB3887
ELECTRICAL CHARACTERISTICS
Page
Page
Page
TYPICAL CHARACTERISTICS
Power supply current ICC (mA)
Reference voltage VREF (V)
Power supply voltage V
Power supply current vs. Power supply voltage
Page
Error amplifier gain and phase vs. Frequency
Gain AV (dB) Frequency f (Hz)
Phase (deg)
Current detection amplifier gain and phase vs. Frequency
Gain AV (dB) Frequency f (Hz)
Error amplifier gain and phase vs. Frequency
Gain AV (dB) Frequency f (Hz)
Page
FUNCTIONAL DESCRIPTION
1. DC/DC Converter Unit
2. Protection Functions
3. Soft-Start Function
SETTING THE CHARGING VOLTAGE
METHOD OF SETTING THE CHARGING CURRENT
METHOD OF SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY
METHOD OF SETTING THE SOFT-START TIME
AC ADAPTOR VOLTAGE DETECTION
OPERATION TIMING DIAGRAM
PROCESSING WITHOUT USING THE CURRENT AMP
PROCESSING WITHOUT USING OF THE ERROR AMP
PROCESSING WITHOUT USING OF THE CS TERMINAL
NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE
APPLICATION EXAMPLE
VIN = 17.65 V to 25 V
less.
OUTD terminal is 17 V or
that voltage applied to
PARTS LIST
REFERENCE DATA
(Constant current mode)
Conversion efficiency (%) BATT charge current IBATT (A)
Conversion efficiency (%) BATT charge voltage VBATT (V)
BATT voltage vs. BATT charge current (set at 12.6 V)
BATT voltage VBATT (V) BATT charge current IBATT (A)
(set at 12.6 V, with 10 V)
(set at 16.8 V, with 10 V)
Soft-start operating waveform
(set at 12.6 V)
(set at 16.8 V)
Discharge operating waveform
(set at 12.6 V)
Soft-start operating waveform
Discharge operating waveform
USAGE PRECAUTIONS
ORDERING INFORMATION
PACKAGE DIMENSION
24-pin plastic SSOP (FPT-24P-M03) Note1: Pins width and pins thickness include plating thickness.
2001 FUJITSU LIMITED F24018S-c-3-4
Note2: * This dimension does not include resin protrusion.
Dimensions in mm (inches) .
FUJITSU LIMITED
F0211 FUJITSU LIMITED Printed in Japan