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SC4605

Semtech Corporation
Part Number SC4605
Manufacturer Semtech Corporation
Description Step Down Controller
Published Nov 17, 2008
Detailed Description Low Input, High Efficiency Synchronous, Step Down Controller POWER MANAGEMENT Description The SC4605 is a voltage mode s...
Datasheet PDF File SC4605 PDF File

SC4605
SC4605

Overview
Low Input, High Efficiency Synchronous, Step Down Controller POWER MANAGEMENT Description The SC4605 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from a input supply range of 2.
8V 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 SC4605 drives external N-channel MOSFETs with 1A peak current.
A non-overlap protection is provided for www.
DataSheet4U.
com the gate drive signals to prevent shoot through of the MOSFET pair.
The voltage drop across the high side MOSFET during its conduction is sensed for lossless short circuit current limiting.
The quiescent supply current in sleep mode is typically lower than 10µA.
A 1.
8ms soft start is internally provided to prevent output voltage overshoot during start-up.
SC4605 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ BICMOS voltage mode PWM controller 2.
8V to 5.
5V Input voltage range Output voltages as low as 0.
8V +/-1% Reference accuracy Sleep mode (Icc = 10µA typ) Lossless adjustable short circuit current limiting Combination pulse by pulse & hiccup mode current limit High efficiency synchronous switching 0% to 97% Duty cycle range 1A Peak current driver 10-Pin MSOP package Applications 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 SC4605 is an ideal choice for 3.
3V, 5V or other low ‹ input supply systems.
It’s available in 10 pin MSOP pack- ‹ age.
‹ ‹ ‹ Typical Application Circuit Vin = 2.
8V - 5.
5V D2 C14 0.
1u C3 4.
7u R13 1 1 2 3 4 C1 180p R1 14.
3k C2 2.
2n C20 470pF 5 1u C71 M1 U1 BST VCC ISET COMP DRVH PHASE DRVL GND VSENSE 10 9 8 7 6 M2 1.
8u C6 330u C5 22u C4 22u L1 C10 220u C11 22u C12 22u R3 Vout = 1.
5V (as low as 0.
8V * ) / 12A FS/SYNC FSET C9 4.
7n R8 200 R7 10k SC4605 R9...


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