SW

4.7pF

C3

4.7PH

L1

FREQ

7

2

6

4

8

3

1

PGND

SGND

BOOT

EN

FB

D1

3A

5V

RF2

100k

C1

22PF

V

IN

2 Cells

R3

150k

RF1

300k

+

V

DD

LM2623

C2

100PF

tant

5

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Folder

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Now

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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.

LM2623

SNVS188I – MAY 2004 – REVISED OCTOBER 2017

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

1

1 Features

1

•

Good Efficiency Over a Very Wide Load Range

•

Very Low Output Voltage Ripple

•

Up to 2-MHz Switching Frequency

•

0.8-V to 14-V Operating Voltage

•

1.1-V Start-up Voltage

•

1.24-V to 14-V Adjustable Output Voltage

•

Up to 2-A Load Current at Low Output Voltages

•

0.17-Ω Internal MOSFET

•

Up to 90% Regulator Efficiency

•

80-µA Typical Operating Current (Into VDD Pin of

Supply)

•

< 2.5-µA Ensured Supply Current In Shutdown

•

Small 8-Pin VSSOP Package (Half the Footprint

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

Package Height

•

4-mm × 4-mm Thermally Enhanced WSON

Package Option

2 Applications

•

Cameras, Pagers and Cell Phones

•

PDAs, Palmtop Computers, GPS devices

•

White LED Drive, TFT, or Scanned LCDs

•

Flash Memory Programming

•

Hand-Held Instruments

•

1, 2, 3, or 4 Cell Alkaline Systems

•

1, 2, or 3 Cell Lithium-ion Systems

3 Description

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

step-up

DC-DC

switching

regulator

for

battery-

powered and low input voltage systems. It accepts an

input voltage between 0.8 V and 14 V and converts it

into a regulated output voltage between 1.24 V and

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

LM2623.

In order to adapt to a number of applications, the

LM2623 allows the designer to vary the output

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

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

performance. The selected values can be fixed or can

vary with battery voltage or input to output voltage

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

regulation mode to produce good efficiency and

stable operation over a wide operating range. It

normally regulates by skipping switching cycles when

it reaches the regulation limit (Pulse Frequency

Modulation).

Note: See Non-Linear Effect and Choosing The

Correct C3 Capacitor so that any challenges with

designing with this part can be taken into account

before a board design/layout is finalized.

For alternative solutions, See Also: LM2700, LM2622,

LM2731, LM2733, and LM2621.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2623

WSON (14)

4.00 mm × 4.00 mm

VSSOP (8)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit