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NCP81161 Datasheet

VR12.5 Compatible Synchronous Buck MOSFET Drivers

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NCP81161 pdf
NCP81161
VR12.5 Compatible
Synchronous Buck MOSFET
Drivers
The NCP81161 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 and desktop systems. Bidirectional EN pin can provide
a fault signal to controller when the gate driver fault detect under
OVP, UVLO occur. Also, an undervoltage lockout function
guarantees the outputs are low when supply voltage is low.
Features
Faster Rise and Fall Times
Adaptive AntiCrossConduction Circuit
Integrated Bootstrap Diode
Pre OV function
ZCD Detect
Floating Top Driver Accommodates Boost Voltages of up to 35 V
Output Disable Control Turns Off Both MOSFETs
Undervoltage Lockout
Power Saving Operation Under Light Load Conditions
Direct Interface to NCP6151 and Other Compatible PWM
Controllers
Thermally Enhanced Package
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
Power Solutions for Desktop Systems
http://onsemi.com
1
DFN8
MN SUFFIX
CASE 506AA
MARKING DIAGRAM
1
A4MG
G
A4 = Specific Device Code
M = Date Code
G = PbFree Device
ORDERING INFORMATION
Device
Package
Shipping
NCP81161MNTBG DFN8 3000 / Tape & Reel
(PbFree)
NCP81161MNTWG DFN8 3000 / Tape & Reel
(PbFree)
†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, 2013
August, 2013 Rev. 2
1
Publication Order Number:
NCP81161/D


  ON Semiconductor Electronic Components Datasheet  

NCP81161 Datasheet

VR12.5 Compatible Synchronous Buck MOSFET Drivers

No Preview Available !

NCP81161 pdf
VCC
PWM
NCP81161
BST 1
DRVH
PWM
EN
FLAG
9
SW
GND
VCC
DRVL
(Top View)
Figure 1. Pin Diagram
Logic
AntiCross
Conduction
VCC
BST
DRVH
SW
DRVL
EN ZCD
UVLO
Detection
Fault
PreOV
Figure 2. Block Diagram
Table 1. Pin Descriptions
Pin No.
Symbol
1 BST
2 PWM
3 EN
4 VCC
5 DRVL
6 GND
7 SW
8 DRVH
9 FLAG
Description
Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin
and the SW pin.
Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode
Emulation Enabled, High = High Side FET Enabled.
Logic input. A logic high to enable the part and a logic low to disable the part.
Power supply input. Connect a bypass capacitor (0.1 mF) from this pin to ground.
Low side gate drive output. Connect to the gate of low side MOSFET.
Bias and reference ground. All signals are referenced to this node (QFN Flag).
Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET.
High side gate drive output. Connect to the gate of high side MOSFET.
Thermal flag. There is no electrical connection to the IC. Connect to ground plane.
http://onsemi.com
2


Part Number NCP81161
Description VR12.5 Compatible Synchronous Buck MOSFET Drivers
Maker ON Semiconductor
Total Page 8 Pages
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