1-17
IC
VGN-
S36C/S36GP/S36LP/S36SP/S36TP/S38CP/
S52B/
S62PS/S62PSY/S62S/
S350F/S350FP/
S360/S360P/
S370F
(J/AM
/AO
)
Confidential
4
IN
5
SYNC
1
SW
2
HG
3
BOOT
8
GND
7
LG
6
VCC
8-Lead SO (NS Package # M08A)
θ
JA
= 172
°
C/W
or
8-Lead LLP (NS Package # LDC08A)
θ
JA
= 39
°
C/W
LM2724ASDX (NATIONAL SEMICONDUCTOR)
HIGH SPEED 3A SYNCHRONOUS MOSFET DRIVER
General Description
The LM2724 is a dual N-channel MOSFET driver which
can drive both the top and bottom MOSFETs in a push-
pull structure simultaneously. The LM2724 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 sink-
ing current for each driver of the LM2724 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 the
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. Minimum output pulse width is as low
as 50ns. When not switching, the LM2724 only draws
up to 195
µ
A from the 5V rail. The synchronization op-
eration of the bottom MOSFET can be disabled by pull-
ing the SYNC pin to ground.
