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LM2724A Datasheet Preview

LM2724A Datasheet

High Speed 3A Synchronous MOSFET Driver

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LM2724A
www.ti.com
SNVS242C – JUNE 2003 – REVISED MARCH 2013
LM2724A High Speed 3A Synchronous MOSFET Driver
Check for Samples: LM2724A
FEATURES
1
2 Shoot-Through Protection
• Input Under-Voltage-Lock-Out
• 3A Peak Driving Current
• 195µA Quiescent Current
• 28V Input Voltage in Buck Configuration
• SOIC-8 and WSON Packages
APPLICATIONS
• High Current DC/DC Power Supplies
• High Input Voltage Switching Regulators
• Fast Transient Microprocessors
• Notebook Computers
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 structure.
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.
TYPICAL APPLICATION
+5V 1.5
C1
1PF
D1
(to controller)
(to controller)
U1
6
VCC
BOOT 3
5 SYNC
HG 2
4 IN
SW 1
8 GND
LG 7
C2
.33PF
VIN (up to 28V)
+
C3
Q1
L1
Q2
VOUT
+
C4
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated




etcTI

LM2724A Datasheet Preview

LM2724A Datasheet

High Speed 3A Synchronous MOSFET Driver

No Preview Available !

LM2724A
SNVS242C – JUNE 2003 – REVISED MARCH 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
CONNECTION DIAGRAM
SW
HG
BOOT
IN
1
2
3
4
8 GND
7 LG
6 VCC
5 SYNC
SW
HG
BOOT
IN
1
2
3
4
8 GND
7 LG
6 VCC
5 SYNC
Figure 1. 8-Lead SOIC
See Package Number D
Figure 2. 8-Lead WSON
See Package Number NGN
PIN DESCRIPTIONS
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. Should be connected to the top FET gate.
3
BOOT
Bootstrap. Accepts a bootstrap voltage for powering the high-side driver
4 IN Accepts a logic control signal
5
SYNC
Bottom gate enable
6 VCC Connect to +5V supply
7 LG Bottom gate drive output. Should be connected to the bottom FET gate.
8
GND
Ground
BLOCK DIAGRAM
+5V
VCC
SYNC
IN
Power
On
Reset
Logic
Shoot-through
Protection
BOOT
HG
SW
+
-
VIN
Q1
VOUT
Q2
LG
GND
2 Submit Documentation Feedback
Product Folder Links: LM2724A
Copyright © 2003–2013, Texas Instruments Incorporated


Part Number LM2724A
Description High Speed 3A Synchronous MOSFET Driver
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LM2724A Datasheet PDF






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