LTC3872 datasheet(1/20 Pages) LINER

Part #	LTC3872

Description	No RSENSE Current Mode Boost DC/DC Controller

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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1 / 20 page

LTC3872

1

3872fa

No RSENSE

Current Mode Boost

DC/DC Controller

The LTC®3872 is a constant frequency current mode

boost DC/DC controller that drives an N-channel power

MOSFET and requires very few external components. The

No RSENSE

TM architecture eliminates the need for a sense

resistor, improves efﬁciency and saves board space.

The LTC3872 provides excellent AC and DC load and line

regulation with ±1.5% output voltage accuracy. It incor-

porates an undervoltage lockout feature that shuts down

the device when the input voltage falls below 2.3V.

High switching frequency of 550kHz allows the use of a

small inductor. The LTC3872 is available in an 8-lead low

proﬁle (1mm) ThinSOTTM package and 8-pin 3mm

× 2mm

DFN package.

■ Telecom Power Supplies

■ 42V Automotive Systems

■ 24V Industrial Controls

■ IP Phone Power Supplies

■ No Current Sense Resistor Required

■ VOUT up to 60V

■ Constant Frequency 550kHz Operation

■ Internal Soft-Start and Optional External Soft-Start

■ Adjustable Current Limit

■ Pulse Skipping at Light Load

■ VIN Range: 2.75V to 9.8V

■ ±1.5% Voltage Reference Accuracy

■ Current Mode Operation for Excellent Line and Load

Transient Response

■ Low Proﬁle (1mm) SOT-23 and 3mm

× 2mm DFN

Packages

High Efﬁciency 3.3V Input, 5V Output Boost Converter

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6498466, 6611131, 5731694.

ITH

IPRG

GND

VFB

VIN

SW

NGATE

LTC3872

3872 TA01

RUN/SS

17.4k

VIN

11k

1%

34.8k

1%

1nF

M1

D1

10

μF

100

μF

×2

1.8nF

47pF

1

μH

VIN

3.3V

VOUT

5V

2A

Efﬁciency and Power Loss vs Load Current

LOAD CURRENT (mA)

30

90

100

10

0.001

20

10

80

50

70

60

40

1

100

1000

10000

3872 TA01b

0

10

1

0.1

0.01

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