LM2725 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – High Speed Synchronous MOSFET Drivers

LM2725, LM2726
www.ti.com
SNVS144D – NOVEMBER 2000 – REVISED MARCH 2013
LM2725/LM2726 High Speed Synchronous MOSFET Drivers
Check for Samples: LM2725, LM2726
FEATURES
1
•2 High Peak Output Current
• Adaptive Shoot-Through Protection
• 36V SW Pin Absolute Maximum Voltage
• Input Under-Voltage-Lock-Out
• Typical 20ns Internal Delay
• Plastic 8-pin SOIC Package
APPLICATIONS
• High Current DC/DC Power Supplies
• High Input Voltage Switching Regulators
• Microprocessors
DESCRIPTION
The LM2725/LM2726 is a family of dual MOSFET
drivers that 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 bottom FETs from
turning on simultaneously. With a bias voltage 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 SOIC-8 package, each driver is
able to handle 50mA average current. When EN
signal is asserted the 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 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 input pulse width is as
low as 55ns.
Typical Application
Note: for ultra low-frequency operation (such as
skip mode at light load), D1 should be a fast
recovery type diode instead of a Schottky.
C2
1U
PWM
SIGNAL
LM2725/ LM2726
6 _{VCC CBOOT} 3
5 _EN
HG ²
4 _{PWM_IN SW} 1
8 _GND
LG ⁷
U1
+
5
10
D1
C1
0.1U
Q1
L1
Q2
Vin (up to 35V)
+
C_in
Vout
+
Cout
1
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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.
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