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  ON Semiconductor Electronic Components Datasheet  

NCP81147 Datasheet

Precise Low Voltage Synchronous Buck Controller

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NCP81147 pdf
NCP81147
Precise Low Voltage
Synchronous Buck
Controller with Power
Saving Mode
The NCP81147 is a simple single phase solution with differential
phase current sensing, power saving operation, and gate drivers to
provide accurately regulated power.
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 NCP81147 features also 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 Vin
Vout from 0.8 V to 3.3 V (5 V with 12 VCC)
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 Rbst = 2.2 W
Automatic Power Saving Mode to Maximize Efficiency During Light
Load Operation
Sync Function
Remote Ground Sensing
This is a Pb−Free Device*
Applications
Desktop and Server Systems
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
www.onsemi.com
MARKING
DIAGRAMS
QFN16
81147
CASE 485G
ALYWG
1G
81147
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
16 15 14 13
VCCP 1
LG 2
LX 3
BOOT 4
12 CSN/VO
11 FBG
10 VSEN
9 FB
5678
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP81147MNTXG QFN16 3000 / Tape & Reel
(Pb−Free)
†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
August, 2016 − Rev. 1
1
Publication Order Number:
NCP81147/D


  ON Semiconductor Electronic Components Datasheet  

NCP81147 Datasheet

Precise Low Voltage Synchronous Buck Controller

No Preview Available !

NCP81147 pdf
NCP81147
CSP 13
CSN/VO 12
+ CDIFF
Current Sense
Amplifier
Over Current
Detector
COMP 8
FBG 11
+
0.8V − Error Amplifier
FB 9
VREF*75%
VREF*125%
− UVP
+
+ OVP
15 6
2.2 W
Control Logic,
Protection,
RAMP
Generator and
PWM Logic
OSC
UVLO
Control
VSEN 10
ROSC/EN 14 1.24V
SYNC 7
Programmable
OSC
VREF*50%
OVP,
− UNLATCHED
+
4 BOOT
5 UG
3 LX
1 VCCP
2 LG
16 GND
Figure 1. NCP81147 BLOCK DIAGRAM
PIN DESCRIPTIONS
Pin No.
Symbol
1 VCCP
2 LG
3 LX
4 BOOT
5 UG
6 PGOOD
7 SYNC
8 COMP
9 FB
10 VSEN
11 FBG
12 CSN/VO
13 CSP
14 ROSC/EN
15 VCC
16 GND
THERMAL PAD
Description
Power supply for bottom gate MOSFET drivers
Bottom gate MOSFET driver pin
Switch node
Supply rail for the floating top gate driver
Top gate MOSFET driver pin
Power Good. It is an open−drain output, set free after SS (with 3x clock delay) as long as the output
voltage monitored through VSEN is within specifications.
Synchronization Pin. The controller synchronizes on the falling edge of a square wave provided to
this pin. Short to GND if not used.
Output of the error amplifier
Inverting input to the error amplifier
Output Voltage Sense
Remote Ground Sense
Inductor differential sense inverting input
Inductor differential sense non−inverting input
Programs the switching frequency; EN: Pull−low to disable the device
Supply rail for the controller internal circuitry
Ground reference
Connects with the silicon substrate for good thermal contact with the PCB. Connect to GND plane.
www.onsemi.com
2


Part Number NCP81147
Description Precise Low Voltage Synchronous Buck Controller
Maker ON Semiconductor
Total Page 12 Pages
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