FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27205-4E
ASSP Power Supplies
BIPOLAR
Switching Regulator Controller
MB3782
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DESCRIPTION
The FUJITSU MB3782 is a PWM-type switching regulator controller, designed with open-collector output for
connection to external drive transistors and coils, providing a selection of three types of output voltage: step-
up, step-down or inverting (inverting output is available on one circuit only).
The MB3782 features identical oscillator output waveforms to enable completely synchronous operation and
prevent the occurrence of low-frequency beat between channels.
Also, the MB3782 features low power dissipation (2.1 mA typ) and a built-in standby mode (10
µA),
making
possible the configuration of a wide variety of high-efficiency, stable power supplies, even with the use of battery
power. The MB3782 is an ideal power supply for high-performance portable devices such as video camcorders
and cameras.
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FEATURES
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Wide voltage range (3.6 to 18 V)
Low power dissipation (operating mode: 2.1 mA (typ), standby mode: 10
µA
(max)
Wide range of oscillator frequencies, high-frequency capability (1 to 500 kHz)
On-chip timer-latch type short detection circuit
On-chip undervoltage lockout circuit
On-chip 2.50 V reference voltage circuit (1.25 V output available at R
T
pin)
Dead time adjustment over full duty cycle range
On-chip standby mode (power on/off function)
(Continued)
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PACKAGE
Plastic DIP 20 pin
,
Plastic SOP 20 pin
,
(DIP-20P-M01)
(FPT-20P-M01)
FUJITSU [ FUJITSU COMPONENT LIMITED. ]
