CIN: TAIYO YUDEN X5R JMK325BJ226MM

CCUK: TAIYO YUDEN X5R EMK316BJ105MF

COUT: TAIYO YUDEN X5R JMK325BJ226MM

D: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR32-150

L2: SUMIDA CR32-470

CCUK

1 PF

COUT

22 PF

L2

47 PH

VIN

5V

D

CFF

330 pF

RFB1

29.4k

RFB2

10k

VIN

SW

NFB

GND

SHDN LM2611A

1

2

3

4

5

CIN

22 PF

L1

15 PH

VOUT - 5V

300 mA

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LM2611

SNOS965J – JUNE 2001 – REVISED DECEMBER 2015

LM2611 1.4-MHz Cuk Converter

1 Features

3 Description

The LM2611 is a current mode, PWM inverting

1

•

1.4-MHz Switching Frequency

switching regulator. Operating from a 2.7-V to 4-V

•

Low RDS(ON) DMOS FET

supply, it is capable of producing a regulated

•

1-mVp-p Output Ripple

negative output voltage of up to

−(36 VIN(MAX)). The

LM2611 utilizes an input and output inductor, which

•

−5 V at 300 mA From 5-V 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 1.4 MHz, the inductors and output capacitor can be

physically small and low cost. High efficiency is

•

Wide Input Range: 2.7 V to 14 V

achieved through the use of a low RDS(ON) FET.

•

Low Shutdown Current: <1 µA

The LM2611 features a shutdown pin, which can be

•

5-Pin SOT-23 Package

activated when the part is not needed to lower the Iq

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

2 Applications

provides a simple method of setting the output

•

MR Head Bias

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

•

Digital Camera CCD Bias

current limiting and internal compensation further

simplify the use of the LM2611.

•

LCD Bias

The LM2611 is available as a small 5-pin, SOT-23

•

GaAs FET Bias

package and comes in two grades. Grade A has a

•

Positive to Negative Conversion

1.2-A current limit and 0.5-

Ω RDS(ON), and Grade B

has a 0.9-A current limit and 0.7-

Ω RDS(ON).

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2611

SOT-23 (5)

1.60 mm × 2.90 mm

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

the end of the data sheet.

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.