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NCP3420
MOSFET Driver with Dual
Outputs for Synchronous
Buck Converters
The NCP3420 is a single Phase 12 V MOSFET gate driver
1
3420
ALYW G
optimized to drive the gates of both high ? side and low ? side power
MOSFETs in a synchronous buck converter. The high ? side and
low ? side driver is capable of driving a 3000 pF load with a 30 ns
propagation delay and a 20 ns transition time.
With a wide operating voltage range, high or low side MOSFET
gate drive voltage can be optimized for the best efficiency. Internal
adaptive nonoverlap circuitry further reduces switching losses by
preventing simultaneous conduction of both MOSFETs.
The floating top driver design can accommodate VBST voltages as
high as 35 V, with transient voltages as high as 40 V. Both gate outputs
can be driven low by applying a low logic level to the Output Disable
(OD) pin. An Undervoltage Lockout function ensures that both driver
outputs are low when the supply voltage is low, and a Thermal
8
1
1
http://onsemi.com
MARKING
DIAGRAMS
8
SO ? 8 3420
D SUFFIX ALYW
CASE 751 G
1
DFN8
MN SUFFIX
CASE 506BJ
G
8
Shutdown function provides the IC with overtemperature protection.
A
L
= Assembly Location
= Wafer Lot
Features
? Thermal Shutdown for System Protection
? Internal Pulldown Resistor Suppresses Transient Turn On of Either
MOSFET
? Anti Cross ? Conduction Protection Circuitry
? One Input Signal Controls Both the Upper and Lower Gate Outputs
? Output Disable Control Turns Off Both MOSFETs
? Complies with VRM10.x and VRM11.x Specifications
? Undervoltage Lockout
? Thermally Enhanced Package Available
? These are Pb ? Free Devices
Y = Year
W = Work Week
G = Pb ? Free Package
PIN CONNECTIONS
1 8
BST DRVH
IN SWN
OD PGND
V CC DRVL
1 8
BST DRVH
IN SWN
OD
V CC
PGND
DRVL
(Top View)
ORDERING INFORMATION
Device
NCP3420DR2G
NCP3420MNR2G
Package
SO ? 8
(Pb ? Free)
DFN8
Shipping ?
2500 Tape & Reel
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, 2009
December, 2009 ? Rev. 3
1
Publication Order Number:
NCP3420/D
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