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LM2724A Datasheet

High Speed 3A Synchronous MOSFET Driver

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June 2003
LM2724A
High Speed 3A Synchronous MOSFET Driver
General Description
The LM2724A is a dual N-channel MOSFET driver which
can drive both the top and bottom MOSFETs in a push-pull
structure simultaneously. The LM2724A takes a logic input
and splits it into two complimentary signals with a typical
20ns dead time in between. The built-in cross-conduction
protection circuitry prevents the top and bottom MOSFETs
from turning on simultaneously. With a bias voltage of 5V, the
peak sourcing and sinking current for each driver of the
LM2724A is about 3A. Input UVLO (Under-Voltage-Lock-
Out) ensures that all the driver outputs stay low until the
supply rail exceeds the power-on threshold during system
power on, or after the supply rail drops below power-on
threshold by a specified hysteresis during system power
down. The cross-conduction protection circuitry detects both
driver outputs and will not turn on a driver until the other
driver output is low. The top gate voltage needed by the top
MOSFET is obtained through an external boot-strap struc-
ture. When not switching, the LM2724A only draws up to
195µA from the 5V rail. The synchronization operation of the
bottom MOSFET can be disabled by pulling the SYNC pin to
ground.
Features
n Shoot-through protection
n Input Under-Voltage-Lock-Out
n 3A peak driving current
n 195µA quiescent current
n 28V input voltage in buck configuration
n SO-8 and LLP packages
Applications
n High Current DC/DC Power Supplies
n High Input Voltage Switching Regulators
n Fast Transient Microprocessors
n Notebook Computers
Typical Application
20073501
© 2003 National Semiconductor Corporation DS200735
www.national.com


National Semiconductor Electronic Components Datasheet

LM2724A Datasheet

High Speed 3A Synchronous MOSFET Driver

No Preview Available !

Connection Diagram
20073502
8-Lead SO (NS Package # M08A)
θJA = 172˚C/W
20073506
8-Lead LLP (NS Package # LDC08A)
θJA = 39˚C/W
Ordering Information
Order Number
LM2724AM
LM2724AMX
LM2724ALD
LM2724ALDX
Pin Descriptions
Pin Name
1 SW
2 HG
3 BOOT
4 IN
5 SYNC
6 VCC
7 LG
8 GND
Size
SO-8
LDC08A
NSC Package
Drawing
M08A
LDC08A
Supplied As
95 Units/Rail
2500 Units/Reel
1000 Units/Rail
4500 Units/Reel
Function
Top driver return. Should be connected to the common node of top
and bottom FETs
Top gate drive output. Should be connected to the top FET gate.
Bootstrap. Accepts a bootstrap voltage for powering the high-side
driver
Accepts a logic control signal
Bottom gate enable
Connect to +5V supply
Bottom gate drive output. Should be connected to the bottom FET
gate.
Ground
www.national.com
2


Part Number LM2724A
Description High Speed 3A Synchronous MOSFET Driver
Maker National Semiconductor
Total Page 8 Pages
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