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  ON Semiconductor Electronic Components Datasheet  

NCP81145 Datasheet

VR12.5 Compatible Synchronous Buck MOSFET Driver

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NCP81145 pdf
NCP81145
VR12.5 Compatible
Synchronous Buck MOSFET
Driver
The NCP81145 is a high performance dual MOSFET gate driver
optimized to drive the gates of both highside and lowside power
MOSFETs in a synchronous buck converter. It can drive up to 3 nF
load with a 25 ns propagation delay and 20 ns transition time.
Adaptive anticrossconduction and power saving operation circuit
can provide a low switching loss and high efficiency solution for
notebook systems.
The UVLO function guarantees the outputs are low when the supply
voltage is low.
Features
Faster Rise and Fall Times
Adaptive AntiCrossConduction Circuit
Zero Cross Detection function
Output Disable Control Turns Off Both MOSFETs
Undervoltage Lockout
Power Saving Operation Under Light Load Conditions
Direct Interface to NCP6131 and Other Compatible PWM
Controllers
Thermally Enhanced Package
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
Power Management Solutions for Notebook systems
http://onsemi.com
1
DFN8
CASE 506AA
MARKING
DIAGRAM
1
A3MG
G
A3 = Specific Device Code
M = Date Code
G = PbFree Package
(*Note: Microdot may be in either location)
PINOUT DIAGRAM
BST 1
PWM 2
EN 3
VCC 4
FLAG
9
8 DRVH
7 SW
6 GND
5 DRVL
ORDERING INFORMATION
Device
Package
NCP81145MNTBG DFN8
(PbFree)
Shipping
3000 / Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2013
December, 2013 Rev. 0
1
Publication Order Number:
NCP81145/D


  ON Semiconductor Electronic Components Datasheet  

NCP81145 Datasheet

VR12.5 Compatible Synchronous Buck MOSFET Driver

No Preview Available !

NCP81145 pdf
VCC
PWM
NCP81145
Logic
AntiCross
Conduction
VCC
BST
DRVH
SW
DRVL
EN
ZCD
Detection
UVLO
Figure 1. Block Diagram
PIN DESCRIPTIONS
Pin No. Symbol
Description
1 BST Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin and
the SW pin.
2
PWM
Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode
Emulation Enabled, High = High Side FET Enabled.
3 EN Logic input. A logic high to enable the part and a logic low to disable the part. Three states logic input:
EN = High to enable the gate driver;
EN = Low to disable the driver;
EN = Mid to go into diode mode (both high and low side gate drive signals are low)
4
VCC
Power supply input. Connect a bypass capacitor (0.1 mF) from this pin to ground.
5 DRVL Low side gate drive output. Connect to the gate of low side MOSFET.
6
GND
Bias and reference ground. All signals are referenced to this node.
7 SW Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET.
8 DRVH High side gate drive output. Connect to the gate of high side MOSFET.
9 FLAG Thermal flag. There is no electrical connection to the IC. Connect to ground plane.
http://onsemi.com
2


Part Number NCP81145
Description VR12.5 Compatible Synchronous Buck MOSFET Driver
Maker ON Semiconductor
Total Page 9 Pages
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