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  ON Semiconductor Electronic Components Datasheet  

NCP81148 Datasheet

Synchronous Buck Controller

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NCP81148 pdf
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 onboard 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 adaptiveripple 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 28pin QFN package.
Features
Wide Input Voltage Range: from 5.5 V to 28 V
Builtin 5 V / 60 mA LDO
Builtin 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
ContinueConductionMode (CCM)
Selected PowerSaving Mode/Forced PWM Mode
TransientResponseEnhancement (TRE) Control
Input Supply Voltage Feed Forward Control
Resistive or Lossless Inductor’s DCR Current Sensing
OverTemperature Protection
Internal Fixed 8.5 ms SoftStart
Fixed Output Voltages 5 V and 3.3 V
Power Good Outputs for Both Channels
Builtin Adaptive Gate Drivers
Output Discharge Operation
Builtin OverVoltage, UnderVoltage Protection
Accurate OverCurrent 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
= PbFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GH2
BST2
SWN2
GL2
PGND2
CSP2
CSN2
28
1
GND
GH1
BST1
SWN1
GL1/FSET
PGND1
CSP1
CSN1
(Top View)
ORDERING INFORMATION
Device
NCP81148MNTWG
Package
QFN28
(PbFree)
Shipping
4,000 /
Tape & Reel
†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
January, 2014 Rev. P0
1
Publication Order Number:
NCP81148/D


  ON Semiconductor Electronic Components Datasheet  

NCP81148 Datasheet

Synchronous Buck Controller

No Preview Available !

NCP81148 pdf
VIN
5V_LDOEN
ENABLE
LDO
VREF
LDO2_EN
ENABLE
NCP81148
++
+
5V_LDOOUT
5V_LDOBYP
LDO2_OUT
CSP1
CSN1
+ CSA
COMP1
Vbias
VREF
FB1 SS
+
E/A
OC & TRE Detection
EN1
PG
GND
PG1
PG2
Vbias
VIN
Control Logic
Ramp Generator
And
PWM Logic
UVLO,
UVP, OVP,
Power Good
OCP, TSD and
Protection
SKIP
BST1
GH1
SW1
5V_LDOOUT
GL1/
FSET
PGND1
Switcher 1 Shown
Figure 1. Block Diagram
http://onsemi.com
2


Part Number NCP81148
Description Synchronous Buck Controller
Maker ON Semiconductor
Total Page 11 Pages
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