NCP3125
4 A Synchronous PWM Switching Converter
The NCP3125 is a flexible synchronous PWM Switching Buck Regulator. The...
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 Over−Load 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
EFFICIENCY (%)
100
95 5 V 90
85
80
75
70
65 0 0.5 1 1.5 2 2.5 3 3.5 4 OUTPUT CURRENT (A) Figure 2. Efficie...