National Semiconductor, The Sight And Sound Of Information, Welcomes You

Products > Analog - Regulators > SwitchingRegulators > LM2623

LM2623 Product Folder

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

See Also:

LM2731 - 40V/1A INTERNAL SWITCH, SOT23, PWM BOOST REGULATOR

Generic P/N 2623

General
Description

Package
& Models

Samples
& Pricing

Reliability
Metrics

Application
Notes

Parametric Table

Parametric Table

Temperature Min (deg C)	-40
Temperature Max (deg C)	85
Multiple Output Capability	Yes
On/Off Pin	Yes
Error Flag	-
InputMin Voltage (Volt)	.80
InputMax Voltage (Volt)	14
Output Current (mA)	2000
Output Voltage (Volt)	14
Adjustable Output	Yes

Output Range	1.24V-14V
Switching Frequency (Hz)	100000
Adj Switch Frequency	Yes
Sync Pin	No
Efficiency (%)	90
Flyback	Yes
Inverting	No
Step-Up	Yes
Step-Down	No
RegType	Switching Regulator

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LM2623 General Purpose, Gated Oscillator Based, DC DC Boost Converter	216 Kbytes	2-Jul-03	View Online	Download	Receive via Email
LM2623 General Purpose, Gated Oscillator Based, DC DC Boost Converter (JAPANESE)	296 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LM2623EV

evaluation board

Full production

N/A

N/A

1+

$25.00

1

-

8 weeks

100

LM2623ALD

14

Full production

N/A

N/A

1K+

$1.09

reel
of
1000

NS
UZXYTT
2623A

5-7 weeks

10000

LM2623LD

14

Full production

N/A

N/A

1K+

$0.87

reel
of
1000

NS
UZXYTT
2623AB

5-7 weeks

10000

LM2623ALDX

14

Full production

N/A

N/A

1K+

$1.09

reel
of
4500

NS
UZXYTT
2623A

5-7 weeks

10000

LM2623LDX

14

Full production

N/A

N/A

1K+

$0.87

reel
of
4500

NS
UZXYTT
2623AB

5-7 weeks

10000

LM2623AMM

8

Full production

N/A

N/A

1K+

$1.09

reel
of
1000

ZXTT
S46A

9-10 weeks

25000

LM2623MM

8

Full production

N/A

N/A

1K+

$0.87

reel
of
1000

ZXTT
S46B

9-10 weeks

25000

LM2623AMMX

8

Full production

N/A

N/A

1K+

$1.09

reel
of
3500

ZXTT
S46A

9-10 weeks

25000

LM2623MMX

8

Full production

N/A

N/A

1K+

$0.87

reel
of
3500

ZXTT
S46B

9-10 weeks

25000

LM2623A MDC

Full production

N/A

N/A

tray
of
N/A

-

N/A

0

LM2623A MWC

Full production

N/A

N/A

wafer jar
of
N/A

-

N/A

0

General 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 .8 and 14 volts and converts it into a regulated output voltage between 1.24 and 14 volts. 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 (300kHz 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: Please read the "Non-Linear Effect" and "Choosing The Correct C3 Capacitor" sub-sections of the Design Procedure section of this data sheet, 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.

Features

Good Efficiency Over a Very Wide Load Range
Very Low Output Voltage Ripple
Small, Mini-SO-8 Package (Half the Footprint of Standard 8 pin SO Package)
1.09 mm Package Height
Up to 2 MHz Switching Frequency
.8V to 14V Operating Voltage
1.1V Start-up Voltage
1.24V - 14V Adjustable Output Voltage
Up to 2A Load Current at low Output Voltages
0.17 Internal MOSFET
Up to 90% Regulator Efficiency
80 µA Typical Operating Current (into V_DD pin of supply)
<2.5µA Guaranteed Supply Current In Shutdown
4mm x 4mm Thermally Enhanced LLP Package Option

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

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Rel. Rejects	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM2623A MDC	ABCD150	0	10200	0	0	92400	39	26125054
LM2623A MWC	ABCD150	0	10200	0	0	92400	39	26125054
LM2623ALD	ABCD150	0	10200	0	0	92400	39	26125054
LM2623ALDX	ABCD150	0	10200	0	0	92400	39	26125054
LM2623AMM	ABCD150	0	10200	0	0	92400	39	26125054
LM2623AMMX	ABCD150	0	10200	0	0	92400	39	26125054
LM2623LD	ABCD150	0	10200	0	0	92400	39	26125054
LM2623LDX	ABCD150	0	10200	0	0	92400	39	26125054
LM2623MM	ABCD150	0	10200	0	0	92400	39	26125054
LM2623MMX	ABCD150	0	10200	0	0	92400	39	26125054

For more information on Reliablitity Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies	113 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-1187: Application Note 1187 Leadless Leadframe Package (LLP)	1463 Kbytes	26-Sep-03	View Online	Download	Receive via Email
Application Note 1187 Leadless Leadframe Package (LLP) (JAPANESE)	5326 Kbytes
AN-1221: Application Note 1221 LM2623 Cookbook	99 Kbytes	2-Jul-03	View Online	Download	Receive via Email
Application Note 1221 LM2623 Cookbook (JAPANESE)	71 Kbytes
AN-1250: Application Note 1250 Inductive Based Switching Regulator Circuits Provide High Efficiency White LED Drives	81 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-1258: Application Note 1258 National's LM2623 Boost Converter - A Simple Versatile Supply	91 Kbytes	2-Jul-03	View Online	Download	Receive via Email
AN-1274: Application Note 1274 LM2623 Evaluation Board	307 Kbytes	7-Jan-04	View Online	Download	Receive via Email
AN-556: Application Note 556 Introduction to Power Supplies	159 Kbytes	25-Sep-02	View Online	Download	Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 15-Jan-2004]