© Semiconductor Components Industries, LLC, 2011
March, 2011 − Rev. P0
1 Publication Order Number:
NCP81031/D
NCP81031
Product Preview
Low Voltage Synchronous
Buck Controller with Power
Saving and Transient
Enhancement Features
The NCP81031 is a simple single phase solution with differential
phase current sensing, low current power saving mode of operation,
and on board gate drivers to provide accurately regulated power. It can
be set up to synchronize to an external clock or PWM signal within
certain frequency range.
The adaptive non overlap gate drive and power saving operation
circuit provide a low switching loss and high efficiency solution for
server, notebook, and desktop systems. A high performance
operational error amplifier is provided to simplify compensation of the
system. The NCP81031 features include soft−start sequence, accurate
overvoltage and over current protection, UVLO for VCC and VCCP,
and thermal shutdown.
Features
• High Performance Operational Error Amplifier
• Internal Soft−Start/Stop
• ±0.5% internal Voltage Accuracy, 0.8 V voltage reference
• OCP accuracy, Four Re−entry Times Before Latch
• “Lossless” Differential Inductor Current Sensing
• Internal high precision current sensing amplifier
• Oscillator Frequency Range of 100 kHz − 1000 kHz
• 20 ns Adaptive FET Non−overlap Time of internal Gate Driver
• 5.0 V to 12 V Operation
• Support 1.5 V to 19 V V
in
• V
out
from 0.8 V to 3.3 V (5 V with 12 V
CC
)
• Chip enable through OSC pin
• Latched Over Voltage Protection (OVP)
• Internally fixed OCP Threshold
• Guaranteed Startup Into Pre−Charged Loads
• Thermally Compensated Current Monitoring
• Thermal Shutdown Protection
• Integrated MOSFET Drivers
• Integrated BOOST diode with internal R
bst
= 2.2 W
• Automatic Power Saving Mode to Maximize Efficiency During Light
Load Operation
• Sync Function
• Remote Ground Sensing
• Enhanced Transient Protection
• This is a Pb−Free Device
Applications
• Desktop and Server Systems
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
QFN16
CASE 485G
MARKING
DIAGRAMS
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
ORDERING INFORMATION
4
1
16 13
9
12
58
14
7
15
6
310
211
GND
UG
PGOOD
SYNC
COMP
FB
VSEN
FBG
CSN/VO
BOOT
LX
LG
VCCP
VCC
ROSC/EN
CSP
PIN CONNECTIONS
1
XXXXX
XXXXX
ALYWG
G
XXXXX = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
