Fast PFET Buck Controller
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
Moisture Sensitivity Level 3
LM51031
SOP-8 PKG
DESCRIPTION
The LM51031 is a switching contoller for use in DC-DC converters.
It can be used in the buck topology with a minimum number of
external components. The LM51031 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 inductiors
and output capacitors, minimizing PC board area and system cost.
The programmable Soft-Start reduces current surges at startup. The
short circuit protection timer signifaicantly reduces the duth cycle to
approximately 1/30 of its cycle during short circuit conditions.
ORDERING INFORMATION
Device
LM51031D
Marking
LM51031
Package
SOP-8
Typical Application (Fixed Output Voltage Versions)
Figure 1. Block Diagram and Typical Application
2008 - Ver. 1.0
HTC
−
1
−