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National Semiconductor - 1.5A High Efficiency Synchronous Switching Regulator

Numéro de référence LM2651
Description 1.5A High Efficiency Synchronous Switching Regulator
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM2651 fiche technique
February 2000
LM2651
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2651 switching regulator provides high efficiency
power conversion over a 100:1 load range (1.5A to 15mA).
This feature makes the LM2651 an ideal fit in
battery-powered applications that demand long battery life in
both run and standby modes.
Synchronous rectification is used to achieve up to 97% effi-
ciency. At light loads, the LM2651 enters a low power hyster-
etic or “sleep” mode to keep the efficiency high. In many ap-
plications, the efficiency still exceeds 80% at 15mA load. A
shutdown pin is available to disable the LM2651 and reduce
the supply current to less than 10µA.
The LM2651 contains a patented current sensing circuitry for
current mode control. This feature eliminates the external
current sensing resistor required by other current-mode
DC-DC converters.
The LM2651 has a 300 kHz fixed frequency internal oscilla-
tor. The high oscillator frequency allows the use of extremely
small, low profile components.
A programmable soft-start feature limits current surges from
the input power supply at start up and provides a simple
means of sequencing multiple power supplies.
Other protection features include input undervoltage lockout,
current limiting, and thermal shutdown.
Features
n Ultra high efficiency up to 97%
n High efficiency over a 1.5A to milliamperes load range
n 4V to 14V input voltage range
n 1.8V, 2.5V, 3.3V, or ADJ output voltage
n Internal MOSFET switch with low RDS(on) of 75m
n 300kHz fixed frequency internal oscillator
n 7µA shutdown current
n Patented current sensing for current mode control
n Input undervoltage lockout
n Adjustable soft-start
n Current limit and thermal shutdown
n 16-pin TSSOP package
Applications
n Personal digital assistants (PDAs)
n Computer peripherals
n Battery-powered devices
n Handheld scanners
n High efficiency 5V conversion
Typical Application
DS100925-15
Efficiency vs Load Current
(VIN = 5V, VOUT = 3.3V)
© 2000 National Semiconductor Corporation DS100925
DS100925-1
www.national.com

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