2.000

2.100

2.200

2.300

2.400

2.500

2.600

2.700

2.800

2.900

3.000

-

40

-

30

-

20

-

10

0 10 20 30 40 50 60 70 80

Temperature (ºC)

2A

1A

0.000

0.050

0.100

0.150

0.200

0.250

0.300

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80

Temperature (ºC)

-50

0

50

100

Temperatur

e

0.800

0.90

0

1.00

0

1.100

1.20

0

1.30

0

1.2

1.7

2.2

2.7

3.2

3.7

4.2

Vin (V)

0

0.5

1

1.5

2

300k

225k

150

75k

V

DD

= 3.3V

TEMPERATURE (ºC)

-40

-25

-10

5

20

35

50

65

80

1.2365

1.236

1.2355

1.235

1.2345

1.234

1.2335

1.233

1.2325

300mA

600mA

10mA

60.0

65.0

70.0

75.0

80.0

85.0

90.0

95.0

1.8

2.1

2.4 2.7

3.0

3.3

3.6

3.9 4.2

4.5

Vin

LM2623

www.ti.com

SNVS188G – MAY 2004 – REVISED DECEMBER 2005

Typical Performance Characteristics

Efficiency

vs

vs

Temperature

Frequency

vs

Maximum Start Up Voltage vs

Temperature

Typical Current Limit vs

Temperature

Temperature

Detailed Description

OPERATING PRINCIPLE

The LM2623 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage

systems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal

limit, and voltage reference in a single 8-pin MSOP package Figure 3. The switching DC-DC regulator boosts an

input voltage between .8V and 14V to a regulated output voltage between 1.24V and 14V. The LM2623 starts

from a low 1.1V input and remains operational down to below .8V.

This device is optimized for use in cellular phones and other applications requiring a small size, low profile, as

well as low quiescent current for maximum battery life during stand-by and shutdown. A high-efficiency gated-

oscillator topology offers an output of up to 2A at low output voltages.

Additional features include a built-in peak switch current limit, and thermal protection circuitry.

Copyright © 2004–2005, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: LM2623