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SC4609

Semtech Corporation
Part Number SC4609
Manufacturer Semtech Corporation
Description High Efficiency Synchronous Buck
Published Nov 17, 2008
Detailed Description Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Description The SC4609 is a voltage mode ste...
Datasheet PDF File SC4609 PDF File

SC4609
SC4609

Overview
Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Description The SC4609 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 2.
7V to 5.
5V.
A high level of integration reduces external component count, and makes it suitable for low voltage applications where cost, size and efficiency are critical.
The SC4609 is capable of producing an output voltage as low as 0.
5V.
SC4609 Features Asynchronous start up Programmable switching frequency up to 1MHz BiCMOS voltage mode PWM controller 2.
7V to 5.
5V input voltage range Output voltage as low as 0.
5V +/-1% reference accuracy Sleep mode (Icc = 10µA typ) Adjustable lossless short circuit current limiting Combination pulse by pulse & hiccup mode current limit High efficiency synchronous switching 1A peak current driver External soft start 12-pin MLP Lead-free package, fully WEEE and RoHS compliant Distributed power architecture Servers/workstations Local microprocessor core power supplies DSP and I/O power supplies Battery-powered applications Telecommunications equipment Data processing applications ‹ ‹ ‹ ‹ ‹ ‹ ‹ The SC4609 drives external, N-channel MOSFETs with a ‹ www.
DataSheet4U.
com peak gate current of 1A.
A non-overlap protection is pro- ‹ vided for the gate drive signals to prevent shoot through of the MOSFET pair.
The SC4609 features lossless current sensing of the voltage drop across the drain to source resistance of the high side MOSFET during its conduction period.
Its switching frequency can be programmed up to 1MHz.
The quiescent supply current in sleep mode is typically lower than 10µA.
A external soft start is provided to prevent output voltage overshoot during start-up.
‹ ‹ ‹ ‹ Applications ‹ ‹ ‹ The SC4609 is an ideal choice for converting 3.
3V, 5V or ‹ other low input supply voltages.
It’s available in 12 pin ‹ MLP package.
‹ ‹ Typical Application Circuit Vin=2.
7V - 5.
5V C10 D2 220u 1u C17...


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