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LM2651MTC-1.8 Datasheet

  • LM2651MTC-1.8

  • 1.5A High Efficiency Synchronous Switching Regulator

  • 11頁

  • NSC

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LM2651 1.5A High Efficiency Synchronous Switching Regulator
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 鈥渟leep鈥?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 10碌A(chǔ).
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
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Ultra high efficiency up to 97%
High efficiency over a 1.5A to milliamperes load range
4V to 14V input voltage range
1.8V, 2.5V, 3.3V, or ADJ output voltage
Internal MOSFET switch with low R
DS(on)
of 75m鈩?/div>
300kHz fixed frequency internal oscillator
7碌A(chǔ) shutdown current
Patented current sensing for current mode control
Input undervoltage lockout
Adjustable soft-start
Current limit and thermal shutdown
16-pin TSSOP package
Applications
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Personal digital assistants (PDAs)
Computer peripherals
Battery-powered devices
Handheld scanners
High efficiency 5V conversion
Typical Application
DS100925-1
DS100925-15
Efficiency vs Load Current
(V
IN
= 5V, V
OUT
= 3.3V)
漏 2000 National Semiconductor Corporation
DS100925
www.national.com

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