NCP3155A, NCP3155B
3 A Synchronous Buck
Regulator
The NCP3155 is a DC/DC synchronous switching regulator with
fully integrated power switches and full fault protection. The
switching frequency of 1 MHz and 500 kHz allows the use of small
filter components, which results in smaller board space and reduced
BOM cost. Available in a SOIC-8 package.
http://onsemi.com
8
Features
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Input Voltage Range from 4.7 V to 24 V
Adjustable Output Voltage
1 MHz Operation (NCP3155A – 500 kHz)
Internally Programmed 1.2 ms Soft−Start (NCP3155A – 2.4 ms)
0.8 ± 1.0% Reference Voltage
48 mW HS−FET and 18 mW LS−FET
Current Limit Protection
Transconductance Amplifier with External Compensation
Input Undervoltage Lockout
Output Overvoltage and Undervoltage Detection
These are Pb−Free Devices
Set Top Boxes
DVD Drives and HDD
LCD Monitors and TVs
Cable Modems
Telecom/Networking/Datacom Equipment
4.7 V − 24 V
VIN
BST VSW
SOIC−8 NB
CASE 751
MARKING DIAGRAM
8
3155x
ALYW
G
1
3155x
A
L
Y
W
G
Typical Applications
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1
= Specific Device Code
x = A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
PGND
VIN
VOUT
VSW
BST
COMP
AGND
FB
ISET
(Top View)
PGND
NCP3155
ISET
COMP
FB1
ORDERING INFORMATION
AGND
Device
Package
Shipping†
NCP3155ADR2G
NCP3155BDR2G
Figure 1. Typical Application Circuit
SOIC−8 2500 / Tape & Reel
(Pb−Free)
SOIC−8 2500 / Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2012
February, 2012 − Rev. 3
1
Publication Order Number:
NCP3155/D
