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NCP81148 Datasheet, PDF (1/11 Pages) ON Semiconductor – Synchronous Buck Controller | |||
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NCP81148
Advance Information
Synchronous Buck Controller
with Auto Power Saving
Mode and Built-In LDO
NCP81148 is a dual synchronous buck controller that is optimized
for converting the battery voltage or adaptor voltage into multiple
power rails required in desktop and notebook system. NCP81148
consists of two buck switching controllers with fixed 5.0 V output on
channel 2, 3.3 V on channel 1 and two onâboard LDOs with three
outputs: 5 V / 60 mA and 3.3 V or 12 V / 10 mA. NCP81148 supports
high efficiency, fast transient response and provides power good
signals. ON Semiconductor proprietary adaptiveâripple control
enables seamless transition from CCM to DCM, where converter runs
at reduced switching frequency with much higher efficiency at light
load. The part operates with supply voltage ranging from 5.5 V to
28 V. NCP81148 is available in a 28âpin QFN package.
Features
⢠Wide Input Voltage Range: from 5.5 V to 28 V
⢠Builtâin 5 V / 60 mA LDO
⢠Builtâin selectable 3.3 V or 12 V / 10 mA LDO
⢠Three Selectable Fixed Frequency 300 KHz, 400 KHz or 600 KHz
⢠180 Interleaved Operation Between the Two Channels in
ContinueâConductionâMode (CCM)
⢠Selected PowerâSaving Mode/Forced PWM Mode
⢠TransientâResponseâEnhancement (TRE) Control
⢠Input Supply Voltage Feed Forward Control
⢠Resistive or Lossless Inductorâs DCR Current Sensing
⢠OverâTemperature Protection
⢠Internal Fixed 8.5 ms SoftâStart
⢠Fixed Output Voltages 5 V and 3.3 V
⢠Power Good Outputs for Both Channels
⢠Builtâin Adaptive Gate Drivers
⢠Output Discharge Operation
⢠Builtâin OverâVoltage, UnderâVoltage Protection
⢠Accurate OverâCurrent Protection
⢠Thermal Shutdown
Applications
⢠Desktop / Notebook Computers
⢠System Power Supplies
⢠I/O Power Supplies
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
http://onsemi.com
MARKING
DIAGRAM
1
28 PIN QFN, 4x4
MN SUFFIX
CASE 485AR
81148
ALYWG
G
81148
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbâFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
28
1
GH2
BST2
SWN2
GL2
PGND2
CSP2
CSN2
GND
GH1
BST1
SWN1
GL1/FSET
PGND1
CSP1
CSN1
(Top View)
ORDERING INFORMATION
Device
NCP81148MNTWG
Package
QFNâ28
(PbâFree)
Shippingâ
4,000 /
Tape & Reel
â 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.
© Semiconductor Components Industries, LLC, 2014
1
January, 2014 â Rev. P0
Publication Order Number:
NCP81148/D
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