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CS51031GD8-CS51031GDR8
Fast PFET Buck Controller
CS51031
Fast PFET Buck Controller
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, 1.0 A 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 an 8 Lead SO plastic package.
Features• 1.0 A Totem Pole Output Driver High Speed Oscillator (700 kHz max) No Stability Compensation Required Lossless Short Circuit Protection VCC Monitor 2.0% Precision Reference Programmable Soft Start Wide Ambient Temperature Range: Industrial Grade: –40°C to 85°C Commercial Grade: 0°C to 70°C
3.3 V @ 3 A
5.0 V–12 V
MP1
Figure 1. Typical Application Diagram
