CS51031_10 Datasheet, PDF (1/10 Pages) ON Semiconductor – Fast P−Ch FET Buck Controller

CS51031
Fast P−Ch FET
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 V_CC
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 startup. The short
circuit protection timer significantly reduces the duty cycle to
approximately 1/30 of its 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
• V_CC 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
• Pb−Free Packages are Available
5.0 V−12 V
C_IN
47 mF
V_GATE
V_GATE
V_C
PGND
CS
C_OSC
C_OSC
470 pF
GND
V_CC
V_FB
MBRS360
D₁
MP₁
IRF7416
RV_CC
100 W
CV_CC
0.1 mF
CS
0.1 mF
R_B
2.5 kW
R_A
1.5 kW
C_RR
0.1 mF
L
4.7 mH
V_O
3.3 V @ 3 A
C_O
100 mF × 2
Figure 1. Typical Application Diagram
© Semiconductor Components Industries, LLC, 2005
1
October, 2005 − Rev. 11
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING DIAGRAM
8
51031
ALYWx
G
1
51031 = 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 2 of this data sheet.
Publication Order Number:
CS51031/D