NCP3155A Datasheet, PDF (1/24 Pages) ON Semiconductor – 3 A Synchronous Buck Regulator

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.
Features
• 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
Typical Applications
• Set Top Boxes
• DVD Drives and HDD
• LCD Monitors and TVs
• Cable Modems
• Telecom/Networking/Datacom Equipment
4.7 V − 24 V
V_IN ^BST _VSW
PGND
NCP3155
ISET
FB1
COMP AGND
V_OUT
Figure 1. Typical Application Circuit
http://onsemi.com
8
1
SOIC−8 NB
CASE 751
MARKING DIAGRAM
8
3155x
ALYW
G
1
3155x
A
L
Y
W
G
= Specific Device Code
x = A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
PGND
V_IN
BST
COMP
V_SW
ISET
AGND
FB
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP3155ADR2G SOIC−8 2500 / Tape & Reel
(Pb−Free)
NCP3155BDR2G 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, 2011
1
February, 2011 − Rev. 1
Publication Order Number:
NCP3155/D