NCP3126 Datasheet, PDF (1/23 Pages) ON Semiconductor – 3 A Synchronous PWM Switching Converter

NCP3126
3 A Synchronous PWM
Switching Converter
The NCP3126 is a flexible synchronous PWM Switching Buck
Regulator. The NCP3126 is capable of producing output voltages as
low as 0.8 V. The NCP3126 also incorporates voltage mode control.
To reduce the number of external components, a number of features
are internally set including switching frequency. The NCP3126 is
currently available in an SOIC−8 package.
Features
• 4.5 V to 13.2 V Operating Input Voltage Range
• 85 mW High−Side, 65 mW Low−Side Switches
• Output Voltage Adjustable to 0.8 V
• 3 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
3126
ALYWXG
G
1
3126
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
NCP3126
PGND
1
VSW
FB
ISET
COMP
VIN
AGND
BST
(Top View)
4.5 V − 13.2 V
VIN
BST
VSW
PGND
NCP3126
ISET
FB1
COMP
AGND
Figure 1. Typical Application Circuit
3.3 V
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 22 of this data sheet.
100
95
5V
90
85
80
75
70
65
0
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT (A)
Figure 2. Efficiency (V_IN = 12 V) vs. Load Current
© Semiconductor Components Industries, LLC, 2010
1
May, 2010 − Rev. 1
Publication Order Number:
NCP3126/D