© Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. P0
1 Publication Order Number:
NCP81039/D
NCP81039
Product Preview
Synchronous Buck
Controller with Auto Power
Saving Mode and 2-Bit VID
Inputs for System Agent
NCP81039 is a synchronous buck controller that is optimized for
converting the battery voltage or adaptor voltage into power supply
rails required in notebook and desktop system. NCP81039 is designed
for applications requiring dynamically selected slew−rate controlled
output voltages. The soft−start is programmed by a single capacitor.
Voltage identification logic−inputs select four resistor programmed
set−point reference voltages that directly set the output voltage of the
converter between 0.65 V to 1.5 V. NCP81039 supports high
efficiency, fast transient response and provides power good signal. ON
Semiconductor proprietary adaptive−ripple control enables seamless
transition from CCM to DCM, where converter runs at reduced
switching frequency with much higher efficiency. The part operates
with input voltage ranging from 3.3 V to 28 V. NCP81039 is available
in a 20−pin 3 mm x 3 mm QFN package.
Features
• Wide Input Voltage Range: from 3.3 V to 28 V
• Three Selectable Fixed Frequency 300 KHz, 400 KHz or 600 KHz
• 2−Bit VID Selects Four Independent Voltages from 0.65 V to 1.5 V
• ±1.0% System Accuracy
• Differential Remote Output Voltage Sensing
• Soft Transient Control Reduces Inrush Current and Audio Noise
• Build−in Power−Good Masking Supports Voltage Identification
(VID) On−The−Fly Transients
• Simple Resistor Programming Voltage Levels
• Programmable Soft−Start through a Single Capacitor
• Automatic Power−Saving Mode
• Input Supply Voltage Feed Forward Control
• Resistive or Lossless Inductor’s DCR Current Sensing
• Over−Temperature Protection
• Built−in Adaptive Gate Drivers
• Output Discharge Operation
• Built−in Over−Voltage, Under−Voltage and Over−Current Protection
and Power Good Output
• This is a Pb−Free Device
Applications
• Notebooks, Desktops & Servers
• I/O Supplies
• System Power Supplies
• Graphic Cards
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
20 PIN QFN, 3x3
MN SUFFIX
CASE 485BC
Device Package Shipping
†
ORDERING INFORMATION
NCP81039MNTWG QFN20
(Pb−Free)
TBD /
Tape & Reel
MARKING
DIAGRAM
TBD = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
http://onsemi.com
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
PIN CONNECTIONS
(Top View)
(Note: Microdot may be in either location)
TBD
ALYWG
G
BST
GH
SWN
VCCP
GL/FSET
EN
VCC
VID1
VID0
V3
COMP
FB
FBRTN
CSN
CSP
V2
V1
VREF
PG
PGND
AGND
1
