MB3821 Datasheet, PDF (1/24 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC With Synchronous Rectifier

FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27221-2E
ASSP For Power Supply Applications
With Power Mode Switching Function
2-ch DC/DC Converter IC With Synchronous Rectifier
MB3821
s DESCRIPTION
The MB3821 is a pulse width modulation (PWM) type 2-channel DC/DC converter IC with synchronous rectification
designed for low voltage, high efficiency operation in high precision and high frequency applications, ideal for down
conversion.
A normal/low-power mode selection is provided, ideal for an internal power supply (3.3V, 5V) in applications with
substantial load current variation, such as notebook computers.
s FEATURES
• Synchronous rectification
• High efficiency
: 93 % (normal power mode, VIN = 6 V, load 1 A)
: 84 % (low power mode, VIN = 6 V, load 20 mA)
• Built-in power mode selector circuit
• Reference voltage accuracy : 2.5V ± 2 %
• Built-in error amp input control type soft start circuit
• Totem pole type output for N-ch MOSFET applications
• Built-in timer-latch type short protection circuit
s PACKAGE
24-pin, Plastic SSOP
(FPT-24P-M03)