CS51031(2001) 查看數據表（PDF） - ON Semiconductor
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CS51031 Datasheet PDF : 12 Pages
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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
5.0 V–12 V
CIN
47 µF
VGATE
VGATE
VC
PGND
CS
COSC
COSC
470 pF
GND
VCC
VFB
RVCC
100 Ω
CVCC
0.1 µF
MBRS360
D1
MP1
IRF7416
CS
0.1 µF
RB
2.5 kΩ
L
4.7 µH
VO
3.3 V @ 3 A
RA
1.5 kΩ
CRR
0.1 µF
CO
100 µF × 2
http://onsemi.com
MARKING
DIAGRAM
8
8
1
SO–8
D SUFFIX
CASE 751
51031
ALYW
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
VGATE
PGND
COSC
GND
VC
CS
VCC
VFB
ORDERING INFORMATION*
Device
Package
Shipping
CS51031YD8
SO–8
95 Units/Rail
CS51031YDR8
SO–8 2500 Tape & Reel
CS51031GD8
SO–8
95 Units/Rail
CS51031GDR8
SO–8 2500 Tape & Reel
*Additional ordering information can be found on
page 9 of this data sheet.
Figure 1. Typical Application Diagram
© Semiconductor Components Industries, LLC, 2002
1
December, 2001 – Rev. 9
Publication Order Number:
CS51031/D
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