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LM2744 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2744
Description  Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External Reference
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2744 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM2744
Low Voltage N-Channel MOSFET Synchronous Buck
Regulator Controller with External Reference
General Description
The LM2744 is a high-speed synchronous buck regulator
controller with an externally adjustable reference voltage
(between 0.5V to 1.5V). It can provide simple down conver-
sion to output voltages as low as 0.5V. Though the control
sections of the IC are rated for 3 to 6V, the driver sections
are designed to accept input supply rails as high as 16V. The
use of adaptive non-overlapping MOSFET gate drivers helps
avoid potential shoot-through problems while maintaining
high efficiency. The IC is designed for the more cost-effective
option of driving only N-channel MOSFETs in both the high-
side and low-side positions. It senses the low-side switch
voltage drop for providing a simple, adjustable current limit.
The fixed-frequency voltage-mode PWM control architecture
is adjustable from 50 kHz to 1 MHz with one external resis-
tor. This wide range of switching frequency gives the power
supply designer the flexibility to make better tradeoffs be-
tween component size, cost and efficiency.
Features include soft-start, input undervoltage lockout
(UVLO) and Power Good (based on both undervoltage and
overvoltage detection). In addition, the shutdown pin of the
IC can be used for providing startup delay, and the soft-start
pin can be used for implementing precise tracking, for the
purpose of sequencing with respect to an external rail.
Features
n
Power stage input voltage from 1V to 16V
n
Control stage input voltage from 3V to 6V
n
Output voltage adjustable down to 0.5V
n
Power good flag and shutdown
n
Output overvoltage and undervoltage detection
n
External reference voltage 0.5V to 1.5V
n
Low-side adjustable current sensing
n
Adjustable soft-start
n
Tracking and sequencing with shutdown and soft start
pins
n
Switching frequency from 50 kHz to 1 MHz
n
TSSOP-14 package
Applications
n
3.3V Buck Regulation
n
Cable Modem, DSL and ADSL
n
Laser Jet and Ink Jet Printers
n
Low Voltage Power Modules
n
DSP, ASIC, Core and I/O
Typical Application
20106001
ADVANCE INFORMATION
September 2004
© 2004 National Semiconductor Corporation
DS201060
www.national.com


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