D: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR32-150

L2: SUMIDA CR32-470

1 PF

22 PF

L2

47 PH

5V

D

330 pF

29.4k

10k

SW

NFB

GND

SHDN LM2611A

1

2

3

4

5

22 PF

L1

15 PH

300 mA

LM2611

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SNOS965I – JUNE 2001 – REVISED APRIL 2013

LM2611 1.4MHz Cuk Converter

Check for Samples: LM2611

1

FEATURES

DESCRIPTION

The LM2611 is a current mode, PWM inverting

2

•

1.4MHz switching frequency

switching regulator. Operating from a 2.7 - 14V

•

supply, it is capable of producing a regulated

•

1mVp-p output ripple

negative output voltage of up to

LM2611 utilizes an input and output inductor, which

•

−5V at 300mA from 5V input

enables low voltage ripple and RMS current on both

•

Better regulation than a charge pump

the input and the output. With a switching frequency

•

Uses tiny capacitors and inductors

of 1.4MHz, the inductors and output capacitor can be

physically small and low cost. High efficiency is

•

Wide input range: 2.7V to 14V

•

Low shutdown current: <1µA

The LM2611 features a shutdown pin, which can be

•

5-lead SOT-23 package

activated when the part is not needed to lower the Iq

and save battery life. A negative feedback (NFB) pin

APPLICATIONS

provides a simple method of setting the output

•

MR Head Bias

voltage, using just two resistors. Cycle-by-cycle

current limiting and internal compensation further

•

Digital camera CCD bias

simplify the use of the LM2611.

•

LCD bias

The LM2611 is available is a small SOT23-5

•

GaAs FET bias

package. It comes in two grades:

•

Positive to negative conversion

Grade A

Grade B

Current Limit

1.2A

0.9A

0.5

Ω

0.7

Ω

Typical Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.