DC-DC Converter. LM2621 Datasheet

LM2621 Converter. Datasheet pdf. Equivalent


Part LM2621
Description Step-Up DC-DC Converter
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LM2621
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Sample &
Buy
Technical
Documents
Tools &
Software
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LM2621
SNVS033D – MAY 2004 – REVISED NOVEMBER 2015
LM2621 Low Input Voltage, Step-Up DC-DC Converter
1 Features
1 Small VSSOP8 Package (Half the Footprint of
Standard 8-Pin SOIC Package)
• 1.09-mm Package Height
• Up to 2-MHz Switching Frequency
• 1.2-V to 14-V Input Voltage
• 1.24-V to 14-V Adjustable Output Voltage
• Up to 1A Load Current
• 0.17-Ω Internal MOSFET
• Up to 90% Regulator Efficiency
• 80-µA Typical Operating Current
• < 2.5-µA Specified Supply Current In Shutdown
2 Applications
• PDAs, Cellular Phones
• 2-Cell and 3-Cell Battery-Operated Equipment
• PCMCIA Cards, Memory Cards
• Flash Memory Programming
• TFT/LCD Applications
• 3.3-V to 5.0-V Conversion
• GPS Devices
• Two-Way Pagers
• Palmtop Computers
• Hand-Held Instruments
3 Description
The LM2621 is a high efficiency, step-up DC-DC
switching regulator for battery-powered and low input
voltage systems. It accepts an input voltage between
1.2 V and 14 V and converts it into a regulated output
voltage. The output voltage can be adjusted between
1.24 V and 14 V. It has an internal 0.17-Ω N-Channel
MOSFET power switch. Efficiencies up to 90% are
achievable using the LM2621.
The high switching frequency (adjustable up to 2
MHz) of the LM2621 allows for tiny surface mount
inductors and capacitors. Because of the unique
constant-duty-cycle gated oscillator topology very
high efficiencies are realized over a wide load range.
The supply current is reduced to 80 µA because of
the BiCMOS process technology. In the shutdown
mode, the supply current is less than 2.5 µA.
The LM2621 is available in a VSSOP-8 package.
This package uses half the board area of a standard
8-pin SOIC and has a height of just 1.09 mm.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM2621
VSSOP (8)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Circuit
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



LM2621
LM2621
SNVS033D – MAY 2004 – REVISED NOVEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 Recommended Operating Conditions....................... 4
6.3 Thermal Information .................................................. 4
6.4 Electrical Characteristics........................................... 4
6.5 Typical Characteristics .............................................. 5
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Applications ................................................ 10
9 Power Supply Recommendations...................... 15
10 Layout................................................................... 15
10.1 Layout Guidelines ................................................. 15
10.2 Layout Example .................................................... 15
11 Device and Documentation Support ................. 16
11.1 Device Support...................................................... 16
11.2 Documentation Support ........................................ 16
11.3 Community Resources.......................................... 16
11.4 Trademarks ........................................................... 16
11.5 Electrostatic Discharge Caution ............................ 16
11.6 Glossary ................................................................ 16
12 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
Changes from Revision C (November 2012) to Revision D
Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ................................................................................................................................................................................... 1
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Product Folder Links: LM2621
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