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LM2744 Datasheet

  • LM2744

  • Low Voltage N-Channel MOSFET Synchronous Buck Regulator Cont...

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LM2744 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External
Reference
ADVANCE INFORMATION
September 2004
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
Power stage input voltage from 1V to 16V
Control stage input voltage from 3V to 6V
Output voltage adjustable down to 0.5V
Power good flag and shutdown
Output overvoltage and undervoltage detection
External reference voltage 0.5V to 1.5V
Low-side adjustable current sensing
Adjustable soft-start
Tracking and sequencing with shutdown and soft start
pins
n
Switching frequency from 50 kHz to 1 MHz
n
TSSOP-14 package
n
n
n
n
n
n
n
n
n
Applications
n
n
n
n
n
3.3V Buck Regulation
Cable Modem, DSL and ADSL
Laser Jet and Ink Jet Printers
Low Voltage Power Modules
DSP, ASIC, Core and I/O
Typical Application
20106001
漏 2004 National Semiconductor Corporation
DS201060
www.national.com

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