lm2724amx National Semiconductor Corporation, lm2724amx Datasheet

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lm2724amx

Manufacturer Part Number
lm2724amx
Description
High Speed 3a Synchronous Mosfet Driver
Manufacturer
National Semiconductor Corporation
Datasheet

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LM2724AMX
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© 2003 National Semiconductor Corporation
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
Typical Application
DS200735
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
www.national.com
20073501
June 2003

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lm2724amx Summary of contents

Page 1

... 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 Typical Application © 2003 National Semiconductor Corporation 195µA from the 5V rail. The synchronization operation of the bottom MOSFET can be disabled by pulling the SYNC pin to ground. ...

Page 2

... Connection Diagram 8-Lead SO (NS Package # M08A) = 172˚C/W θ JA Ordering Information Order Number LM2724AM LM2724AMX LM2724ALD LM2724ALDX Pin Descriptions Pin Name BOOT SYNC GND www.national.com 20073502 8-Lead LLP (NS Package # LDC08A) Size NSC Package Drawing SO-8 M08A ...

Page 3

Block Diagram 3 20073503 www.national.com ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications BOOT to SW BOOT to GND (Note GND Junction Temperature Power Dissipation (Note 3) ...

Page 5

Electrical Characteristics LM2724A (Continued BOOT = SYNC = 5V GND = 0V, unless otherwise specified. Typicals and limits appearing in plain type apply for CC = +25˚C. Limits appearing in boldface type apply over the entire ...

Page 6

Timing Diagram www.national.com 6 20073504 ...

Page 7

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Small Outline Package Order Number LM2724AM, LM2724AMX NS Package Number M08A 7 www.national.com ...

Page 8

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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