NCP4331 Datasheet, PDF (1/23 Pages) ON Semiconductor – Synchronous Buck Controller for High Efficiency Post Regulation

NCP4331
Advance Information
Synchronous Buck
Controller for High
Efficiency Post Regulation
The NCP4331 houses a dual MOSFET driver intended to be used as
a companion chip in ac-dc or dc-dc multi-output post regulated
power supplies. Directly fed by the secondary ac signal, the device
keeps power dissipation to the lowest while reducing external
component count. Further, the implementation of N-channel
MOSFETs gives NCP4331-based applications a significant advantage
in terms of efficiency.
Features
•ăHigh Gate Drive Capability
•ăBootstrap for N-MOSFET High-Side Drive
•ăTwo Embedded Error Amplifiers Allowing Constant Current
Constant Voltage (CCCV) Operation
•ă±1.5% Regulation Voltage Reference Over 0°C to 85°C Temperature
Range
•ăProgrammable Soft-Start
•ăThermal Shutdown for Overtemperature Protection
•ăPWM Operation Synchronized to the Converter Frequency
•ăOver-Lap Management for Soft Switching
•ăInternal Regulator to Ease the Circuit Feeding
•ăUndervoltage Detection
•ăThese are Pb-Free Devices
Typical Applications
•ăOff-line Switch Mode Power Supplies
•ăPower Dc-dc Converters
•ăEfficient Alternative to Mag-Amp Post-Regulators
http://onsemi.com
MARKING DIAGRAMS
16
1
SO-16
D SUFFIX
CASE 751B
16
NCP4331G
ALYYWW
1
16
16
NCP
1
TSSOP-16
DB SUFFIX
CASE 948F
4331
ALYWG
G
1
A
= Assembly Location
L
= Wafer Lot
YY
= Year
WW = Work Week
G or G = Pb-Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
CSout 1
CSin- 2
CSin+ 3
UVP/STDWN 4
COMP 5
FB 6
SS/Dmax 7
Cramp 8
16 VCC
15 BST
14 HS_DRV
13 HB
12 VDD
11 LS_DRV
10 GND
9 SYNC
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP4331DR2G
SOIC-16
(Pb-Free)
NCP4331DBR2G TSSOP-16
(Pb-Free)
2500 /
Tape & Reel
2500 /
Tape & Reel
†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.
©Ă Semiconductor Components Industries, LLC, 2007
1
October, 2007 - Rev. P1
Publication Order Number:
NCP4331/D