SW

4.7pF

C3

4.72H

L1

FREQ

7

2

6

4

8

3

1

PGND

SGND

BOOT

EN

FB

D1

3A

5V

RF2

100k

C1

222F

V

IN

2 Cells

R3

150k

RF1

300k

+

V

DD

LM2623

C2

1002F

tant

5

Product

Folder

Sample &

Buy

Technical

Documents

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Software

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Community

LM2623

SNVS188H – MAY 2004 – REVISED NOVEMBER 2014

LM2623 General-Purpose, Gated-Oscillator-Based DC/DC Boost Converter

1 Features

3 Description

The LM2623 is a high-efficiency, general-purpose,

1

•

Good Efficiency Over a Very Wide Load Range

step-up

DC-DC

switching

regulator

for

battery-

•

Very Low Output Voltage Ripple

powered and low input voltage systems. It accepts an

•

Up to 2-MHz Switching Frequency

input voltage between 0.8 V and 14 V and converts it

into a regulated output voltage between 1.24 V and

•

0.8-V to 14-V Operating Voltage

14 V. Efficiencies up to 90% are achievable with the

•

1.1-V Start-up Voltage

LM2623.

•

1.24-V to 14-V Adjustable Output Voltage

In order to adapt to a number of applications, the

•

Up to 2-A Load Current at Low Output Voltages

LM2623 allows the designer to vary the output

•

0.17-

Ω Internal MOSFET

voltage, the operating frequency (300 kHz to 2 MHz)

and duty cycle (17% to 90%) to optimize the part's

•

Up to 90% Regulator Efficiency

performance. The selected values can be fixed or can

•

vary with battery voltage or input to output voltage

Supply)

ratio. The LM2623 uses a very simple, on/off

•

< 2.5-µA Ensured Supply Current In Shutdown

regulation mode to produce good efficiency and

stable operation over a wide operating range. It

•

Small 8-Pin VSSOP Package (Half the Footprint

normally regulates by skipping switching cycles when

of Standard 8-Pin SOIC Package); 1.09-mm

it reaches the regulation limit (Pulse Frequency

Package Height

Modulation).

•

4-mm x 4-mm Thermally Enhanced WSON

Note:

Please

read

the

Non-Linear

Effect

and

Package Option

Choosing the Correct C3 Capacitor sections so that

any challenges with designing with this part can be

2 Applications

taken into account before a board design/layout is

•

Cameras, Pagers and Cell Phones

finalized.

•

PDAs, Palmtop Computers, GPS devices

For alternative solutions, See Also: LM2700, LM2622,

•

White LED Drive, TFT, or Scanned LCDs

LM2731, LM2733, and LM2621.

•

Flash Memory Programming

Device Information(1)

•

Hand-Held Instruments

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

1, 2, 3, or 4 Cell Alkaline Systems

WSON (14)

4.00 mm x 4.00 mm

•

1, 2, or 3 Cell Lithium-ion Systems

LM2623

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.