Document
FUJITSU MICROELECTRONICS DATA SHEET
DS04-27241-1Ea
ASSP for Power Supply Applications (Secondary battery)
DC/DC Converter IC for Charging Li-ion Battery
MB39A114
■ DESCRIPTION
The MB39A114 is a DC/DC converter IC of pulse width modulation (PWM) type for charging, capable of independently controlling the output voltage and output current. It is suitable for down conversion.
MB39A114 can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC adapter to keep its power constant (dynamically-controlled charging) .
This IC can easily set the charge current value, making it ideal for use as a built-in charging device in products such as notebook PC.
■ FEATURES
• Built-in constant current control circuit in 2-system. • Analog control of charge current value is possible. (+INE1 terminal and +INE2 terminal) • Built-in AC adapter detection function (When VCC is lower than the battery voltage +0.2 V, output is fixed in the off.) • Constant voltage control state detection function (CVM terminal) enables prevention of mis-detection for full
charge. • Built-in overvoltage detection function (OVP terminal) of charge voltage
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■ PACKAGE
24-pin plastic SSOP
(FPT-24P-M03)
Copyright©2004-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved 2004.5
MB39A114
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• Wide range of operating power-supply voltage range : 8 V to 25 V
• Built-in output setting resistor
• Built-in switching function (SEL terminal) of output setting voltage 16.8 V or 12.6 V
• Output voltage setting accuracy
: ± 0.74% (Ta = −10 °C to +85 °C)
• Built-in high accuracy current detection amplifier : ± 5% (At the input voltage difference of 100 mV) ,
± 15% (At the input voltage difference of 20 mV)
• Output voltage setting resistor is open to enable prevention of invalidity current at IC standby (ICC = 0 µA Typ).
• Oscillation frequency range
: 100 kHz to 500 kHz
• Built-in current detection Amp with wide in-phase input voltage range : 0 V to VCC
• Built-in soft-start function independent of loads
• Built-in standby current function
: 0 µA (Typ)
• Built-in totem-pole type output stage supporting Pch MOS FET devices.
2
■ PIN ASSIGNMENT
−INC2 OUTC2
+INE2 −INE2
CVM VREF FB12 −INE1 +INE1 OUTC1
SEL −INC1
(TOP VIEW)
1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13
(FPT-24P-M03)
MB39A114
+INC2 GND CS VCC OUT VH OVP RT −INE3 FB3 CTL +INC1
3
MB39A114
■ PIN DESCRIPTION
Pin No. 1 2 3 4
Symbol −INC2 OUTC2 +INE2 −INE2
5 CVM
6 VREF 7 FB12 8 −INE1 9 +INE1 10 OUTC1
11 SEL
12 −INC1 13 +INC1
14 CTL
15 FB3 16 −INE3
17 RT
18 OVP
19 VH 20 OUT
21 VCC
22 CS 23 GND 24 +INC2
I/O Description
I Current detection amplifier (Current Amp2) inverted input terminal
O Current detection amplifier (Current Amp2) output terminal
I Error amplifier (Error Amp2) non-inverted input terminal
I Error amplifier (Error Amp2) inverted input terminal
O
Open drain type output terminal of constant voltage control state detection.