SC4605
SC4605 is Step Down Controller manufactured by SEMTECH.
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 ponent 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 .. 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.
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 bination 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 Telemunications 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 470p F 5 1u C71 M1 U1 BST VCC ISET P 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
R9 11.5k
- External ponents can be modified to provide a Vout as low as 0.8V.
Revision: October 14,...
