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LM2726 Datasheet

High Speed Synchronous MOSFET Drivers

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November 2000
LM2725/LM2726
High Speed Synchronous MOSFET Drivers
General Description
The LM2725/LM2726 is a family of dual MOSFET drivers
that can drive both the top MOSFET and bottom MOSFET in
a push-pull structure simultaneously. It takes a logic level
PWM input and splits it into two complimentary signals with
a typical 20ns dead time in between. The built-in
shoot-through protection circuitry prevents the top and bot-
tom FETs from turning on simultaneously. With a bias volt-
age of 5V, the peak sourcing and sinking current for each
driver of the LM2725 is about 1.2A and that of the LM2726 is
about 3A. In an SO-8 package, each driver is able to handle
50mA
average
current.
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 de-
tects both the driver outputs and will not turn on a driver until
the other driver output is low. The top gate bias voltage
needed by the top MOSFET can be obtained through an
external bootstrap structure. Minimum pulse width is as low
as 55ns.
Features
n High peak output current
n Adaptive shoot-through protection
n 36V SW pin absolute maximum voltage
n Input Under-Voltage-Lock-Out
n Typical 20ns internal delay
n Plastic 8-pin SO package
Applications
n High Current DC/DC Power Supplies
n High Input Voltage Switching Regulators
n Microprocessors
Typical Application
Connection Diagram
8-Lead Small Outline Package
© 2000 National Semiconductor Corporation DS200072
Top View
DS200072-2
DS200072-1
www.national.com


National Semiconductor Electronic Components Datasheet

LM2726 Datasheet

High Speed Synchronous MOSFET Drivers

No Preview Available !

Ordering Information
Order Number
LM2725
LM2726
Package Type
LM2725M
LM2725MX
LM2726M
LM2726MX
NSC Package Drawing
M08A
Supplied As
95 Units/Rail
2500 Units/Reel
95 Units/Rail
2500 Units/Reel
Pin Description
Pin Name
Function
1 SW Top driver return. Should be connected to the common node of
top and bottom FETs
2 HG Top gate drive output
3
CBOOT
Bootstrap. Accepts a bootstrap voltage for powering the high-side
driver
4
PWM_IN
Accepts a 5V-logic control signal
5 EN Chip Enable
6
VCC
Connect to +5V supply
7 LG Bottom gate drive output
8
GND
Ground
Block Diagram
DS200072-4
www.national.com
2


Part Number LM2726
Description High Speed Synchronous MOSFET Drivers
Maker National Semiconductor
Total Page 9 Pages
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