LM2726 NSC [National Semiconductor], LM2726 Datasheet

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LM2726

Manufacturer Part Number
LM2726
Description
High Speed Synchronous MOSFET Drivers
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2000 National Semiconductor Corporation
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
(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
Typical Application
Connection Diagram
average
current.
DS200072
Input
8-Lead Small Outline Package
UVLO
Top View
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
DS200072-2
DS200072-1
November 2000
www.national.com

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LM2726 Summary of contents

Page 1

... 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 SO-8 package, each driver is able to handle 50mA average current ...

Page 2

... Package Type NSC Package Drawing LM2725M LM2725MX M08A LM2726M LM2726MX Top driver return. Should be connected to the common node of top and bottom FETs Top gate drive output Bootstrap. Accepts a bootstrap voltage for powering the high-side driver Accepts a 5V-logic control signal Chip Enable ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VCC CBOOT CBOOT PGND Junction Temperature Power Dissipation (Note 2) Electrical Characteristics LM2725 VCC = ...

Page 4

... Input Voltage V PWM_IN Low Level IL_PWM Input Voltage Electrical Characteristics LM2726 VCC = CBOOT = 5V GND = 0V, unless otherwise specified. Typicals and limits appearing in plain type apply for +25˚C. Limits appearing in boldface type apply over the entire operating temperature range. J Symbol Parameter ...

Page 5

... The maximum allowable power dissipation at any ambient temperature is calculated using ambient thermal resistance, , for LM2725/LM2726 is 172˚C/W. For Note 3: ESD machine model susceptibility is 100V. Note 4: If after a rising edge, a falling edge occurs sooner than the specified value, the IC may intermittently fail to turn on the bottom gate when the top gate is off. ...

Page 6

Timing Diagram www.national.com 6 DS200072-3 ...

Page 7

Test Circuits Test Circuit 1 Test Circuit 3 DS200072-5 Test Circuit 2 DS200072-7 Test Circuit 4 7 DS200072-6 DS200072-8 www.national.com ...

Page 8

Typical Waveforms FIGURE 1. Switching Waveforms of Test Circuit FIGURE 2. When Input Goes High www.national.com DS200072-13 FIGURE 3. When Input Goes Low DS200072-14 FIGURE 4. Minimum Positive Pulse 8 DS200072-15 DS200072-16 ...

Page 9

Physical Dimensions LIFE SUPPORT POLICY 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. ...

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