CS51031
CS51031
Fast PFET Buck Controller Does Not Require Compensation
Description
The CS51031 is a switching controll...
CS51031
CS51031
Fast PFET Buck Controller Does Not Require Compensation
Description
The CS51031 is a switching controller for use in DC-DC converters. It can be used in the buck topology with a minimum number of external components. The CS51031 consists of a VCC monitor for controlling the state of the device, 1.0A power driver for controlling the gate of a discrete P-channel
transistor, fixed frequency oscillator, short circuit protection timer, programmable soft start, precision reference, fast output voltage monitoring comparator, and output stage driver logic with latch. The high frequency oscillator allows the use of small inductors and output capacitors, minimizing PC board area and systems cost. The programmable soft start reduces current surges at start up. The short circuit protection timer significantly reduces the duty cycle to approximately 1/30 of its cycle during short circuit conditions. The CS51031 is available in 8L SO and 8L PDIP plastic packages.
Features
s 1A Totem Pole Output Driver s High Speed Oscillator (700kHz max) s No Stability Compensation Required s Lossless Short Circuit Protection s VCC Monitor s 2% Precision Reference s Programmable Soft Start
Typical Application Diagram
5V - 12V CIN 47mF 20W MP1 IRF7416
Package Options
8 Lead SO Narrow & PDIP VGATE
1
VGATE VGATE
PGnd
VC CS VCC VFB
VC
MBRS360 CS RVCC 10W CVCC 100mF CS 0.1mF D1 L 4.7mH
PGnd COSC Gnd
CS51031 COSC
COSC 150pF Gnd
VCC
VFB
100 .01mF
RB 2.5kW
VO 3.3V @ 3A
RA 1.5kW
CRR...