NCP3125 Datasheet, PDF (1/22 Pages) ON Semiconductor – 4 A Synchronous PWM Switching Converter

NCP3125
4 A Synchronous PWM
Switching Converter
The NCP3125 is a flexible synchronous PWM Switching Buck
Regulator. The NCP3125 is capable of producing output voltages as
low as 0.8 V. The NCP3125 also incorporates voltage mode control.
To reduce the number of external components, a number of features
are internally set including switching frequency. The NCP3125 is
currently available in an SOIC−8 package.
Features
• 4.5 V to 13.2 V Operating Input Voltage Range
• 60 mW High−Side, 36 mW Low−Side Switches
• Output Voltage Adjustable to 0.8 V
• 4 A Continuous Output Current
• Fixed 350 kHz PWM Operation
• 1.0% Initial Output Accuracy
• 75% Max Duty Ratio
• Short−Circuit Protection
• Programmable Current Limit
• This is a Pb−Free Device
Typical Application
• Set Top Boxes
• DVD Drives and HDD
• LCD Monitors and TVs
• Cable Modems
• Telecom / Networking / Datacom Equipment
http://onsemi.com
8
1
SOIC−8 NB
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
3125
ALYWXG
G
1
3125
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year/
= Work Week
= Pb−Free Package
PIN CONNECTIONS
PGND
FB
COMP
AGND
1
(Top View)
VSW
ISET
VIN
BST
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 21 of this data sheet.
4.5 V − 13.2 V
VIN
BST
VSW
PGND
NCP3125
ISET
FB1
COMP
AGND
Figure 1. Typical Application Circuit
3.3 V
100
95
5V
90
85
80
75
70
65
0 0.5 1 1.5 2 2.5 3 3.5 4
OUTPUT CURRENT (A)
Figure 2. Efficiency (V_IN = 12 V) vs. Load Current
© Semiconductor Components Industries, LLC, 2010
1
April, 2010 − Rev. 1
Publication Order Number:
NCP3125/D