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LM2651 Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte LM2651
Spiegazioni elettronici  1.5A High Efficiency Synchronous Switching Regulator
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Produttore elettronici  TI1 [Texas Instruments]
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LM2651
www.ti.com
SNVS032C – MAY 2004 – REVISED APRIL 2005
LM2651 1.5A High Efficiency Synchronous Switching Regulator
Check for Samples: LM2651
1
FEATURES
Input undervoltage lockout
Adjustable soft-start
2
Ultra high efficiency up to 97%
Current limit and thermal shutdown
High efficiency over a 1.5A to milliamperes
load range
16-pin TSSOP package
4V to 14V input voltage range
APPLICATIONS
1.8V, 2.5V, 3.3V, or ADJ output voltage
Personal digital assistants (PDAs)
Internal MOSFET switch with low RDS(on) of
75m
Computer peripherals
300kHz fixed frequency internal oscillator
Battery-powered devices
7µA shutdown current
Handheld scanners
Patented current sensing for current mode
High efficiency 5V conversion
control
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 oscillator. 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
Figure 1. Efficiency vs Load Current
(VIN = 5V, VOUT = 3.3V
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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