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LM2743 Datasheet

  • LM2743

  • N-Channel FET Synchronous Buck Regulator Controller for Conv...

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LM2743 N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V
April 2004
LM2743
N-Channel FET Synchronous Buck Regulator Controller
for Conversion from 3.3V
General Description
The LM2743 is a high-speed, N-Channel synchronous buck
regulator controller with a 2%, 0.6V feedback reference volt-
age intended to make down conversion from 3.3V to as low
as 0.6V easy. A fixed-frequency voltage-mode PWM control
architecture is used, that is adjustable from 50kHz to 2MHz
through an external resistor. This wide range of PWM fre-
quencies gives the power supply designer the flexibility to
make tradeoffs among component size, cost, noise and
efficiency. The power MOSFETs can run on a separate 1V to
16V (Input Voltage, V
IN
) (Note 2) rail while the regulator is
biased from a 3V to 6V (IC Input Voltage, V
CC
), 2mA rail. A
power-good flag, precision shutdown threshold and soft start
features make power supply tracking and sequencing easy.
The LM2743 employs output under-voltage and over-voltage
flag, and current limit. Current limit is achieved by monitoring
the voltage drop across the on resistance of the low-side
MOSFET. The adaptive non-overlapping MOSFET gate driv-
ers help avoid potential shoot-through problems while main-
taining high efficiency. Both high-side and low-side MOS-
FETs are the lower cost N-Channel type, and the IC can
accept a bootstrap structure to saturate the high-side MOS-
FET for highest efficiency.
Features
MOSFET input voltage (V
IN
) from 1V to 16V (Note 2)
IC input voltage (V
CC
) from 3V to 6V
Output voltage adjustable down to 0.6V
Power good flag and output enable
Output over-voltage and under-voltage flag
FB voltage: 2% over temperature
Current limit without series sense resistor
Adjustable soft start
Tracking and sequencing with shutdown and soft start
pins
n
Switching frequency from 50 kHz to 2 MHz
n
TSSOP-14 package
n
n
n
n
n
n
n
n
n
Applications
n
n
n
n
3.3V Buck Regulation
Set-Top Boxes/ Home Gateways
Core Logic Regulators
High-Efficiency Buck Regulation
Typical Application
20095201
漏 2004 National Semiconductor Corporation
DS200952
www.national.com

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