CS51033_05 Datasheet, PDF (1/10 Pages) ON Semiconductor – Fast P−Ch FET Buck Controller

CS51033
Fast P−Ch FET Buck
Controller
The CS51033 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 CS51033 consists of a 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 P−Ch FET duty cycle
to approximately 1/30 of its normal cycle during short circuit
conditions.
Features
• 1.0 A Totem Pole Output Driver
• High Speed Oscillator (700 kHz max)
• No Stability Compensation Required
• Lossless Short Circuit Protection
• 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
• Pb−Free Packages are Available
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING DIAGRAM
8
51033
ALYWx
G
1
51033 = Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
x
= Continuation of Device Code
x = Y or G
G
= Pb−Free Package
PIN CONNECTIONS
1
V_GATE
PGND
C_OSC
GND
V_C
CS
V_CC
V_FB
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
1
October, 2005 − Rev. 10
Publication Order Number:
CS51033/D