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National Semiconductor Electronic Components Datasheet

LM2722 Datasheet

MOSFET Driver

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December 2001
LM2722
High Speed Synchronous/Asynchronous MOSFET Driver
General Description
The LM2722, part of the LM2726 family, is designed to be
used with multi-phase controllers. This part differs from the
LM2726 by changing the functionality of the SYNC_EN pin
from a whole chip enable to a low side MOSFET enable. As
a result, the SYNC_EN pin now provides control between
Synchronous and Asynchronous operations. Having this
control can be advantageous in portable systems since
Asynchronous operations can be more efficient at very light
loads.
The LM2722 drives both top and bottom MOSFETs 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
cross-conduction protection circuitry prevents the top and
bottom FETs from turning on simultaneously. The
cross-conduction protection circuitry detects both the driver
outputs and will not turn on a driver until the other driver
output is low. With a bias voltage of 5V, the peak sourcing
and sinking current for each driver of the LM2722 is typically
3A. In an SO-8 package, each driver is able to handle 50mA
average current. Input UVLO (Under-Voltage-Lock-Out)
forces both driver outputs low to ensure proper power-up
and power-down operation. The gate drive bias voltage
needed by the high side MOSFET is obtained through an
external bootstrap. Minimum pulse width is as low as 55ns.
Features
n Synchronous or Asynchronous Operation
n Adaptive shoot-through protection
n Input Under-Voltage-Lock-Out
n Typical 20ns internal delay
n Plastic 8-pin SO package
Applications
n Driver for LM2723 Intel Mobile Northwood CPU core
power supply.
n High Current DC/DC Power Supplies
n High Input Voltage Switching Regulators
n Fast Transient Microprocessors
Typical Application
Note: National is an Intel Mobile Voltage Positioning (IMVP) licensee.
© 2001 National Semiconductor Corporation DS200289
20028901
www.national.com


National Semiconductor Electronic Components Datasheet

LM2722 Datasheet

MOSFET Driver

No Preview Available !

Connection Diagram
8-Lead Small Outline Package
Top View
20028902
Ordering Information
Order Number
LM2722
Package Type
LM2722M
LM2722MX
NSC Package Drawing
M08A
Supplied As
95 Units/Rail
2500 Units/Reel
Pin Description
Pin Name
Function
Top driver return. Should be connected to the common node of top
1 SW
and bottom FETs
2 HG Top gate drive output
Bootstrap. Accepts a bootstrap voltage for powering the high-side
3 CBOOT
driver
4
PWM_IN
Accepts a 5V-logic control signal
5
SYNC_EN
Low gate Enable
6
VCC
Connect to +5V supply
7 LG Bottom gate drive output
8
GND
Ground
www.national.com
2


Part Number LM2722
Description MOSFET Driver
Maker National Semiconductor
Total Page 8 Pages
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