LM2651MTC-3.3 National Semiconductor, LM2651MTC-3.3 Datasheet

LM2651MTC-3.3

Manufacturer Part Number

LM2651MTC-3.3

Description

DC/DC Converter IC

Manufacturer

National Semiconductor

Datasheets

1.LM2651MTCX-3.3.pdf (11 pages)

2.LM2651MTC-3.3.pdf (11 pages)

3.LM2651MTC-3.3.pdf (10 pages)

Specifications of LM2651MTC-3.3

Input Voltage

14V

Output Voltage

3.3V

No. Of Pins

Mounting Type

Surface Mount

Voltage Regulator Type

Buck Switching

Output Current Max

1.5A

Peak Reflow Compatible (260 C)

Current Rating

1.5A

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

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Bonase Electronics (HK) Co., Limited

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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%

efficiency. At light loads, the LM2651 enters a low power

hysteretic or “sleep” mode to keep the efficiency high. In

many applications, 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.

Typical Application

Efficiency vs Load Current

= 5V, V

OUT

= 3.3V

DS100925

10092515

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 R

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

DS(on)

of 75mΩ

www.national.com

April 2005

10092501

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