LTC1871-1 LINER [Linear Technology], LTC1871-1 Datasheet

LTC1871-1

Manufacturer Part Number

LTC1871-1

Description

High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC1871-1.pdf (28 pages)

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Download datasheet (393Kb)

FEATURES

APPLICATIONS

TYPICAL APPLICATION

5V TO 32V

Single Inductor Architecture Allows V

Below or Equal to V

Wide V

Synchronous Rectiﬁ cation: Up to 98% Efﬁ ciency

Current Mode Control

±1% Output Voltage Accuracy: 0.8V < V

Phase-Lockable Fixed Frequency: 200kHz to 400kHz

Power Good Output Voltage Monitor

Internal LDO for MOSFET Supply

Quad N-Channel MOSFET Synchronous Drive

Adjustable Soft-Start Current Ramping

Foldback Output Current Limiting

Selectable Low Current Modes

Output Overvoltage Protection

Available in 24-Lead SSOP and Exposed Pad

(5mm × 5mm) 32-Lead QFN Packages

Automotive Systems

Telecom Systems

DC Power Distribution Systems

High Power Battery-Operated Devices

Industrial Control

OUT

Disconnected from V

22μF

50V

CER

Range: 4V to 36V Operation

20k

0.1μF

2200pF

4.7μF

High Efﬁ ciency Buck-Boost Converter

OUT

0.1μF

0.010Ω

4.7μH

TG2

BOOST2

SW2

BG2

SGND

SENSE

PGOOD

LTC3780

During Shutdown

SENSE

INTV

BOOST1

–

OSENSE

PLLIN

PGND

SW1

RUN

BG1

TG1

FCB

ON/OFF

OUT

Above,

7.5k

0.1μF

< 30V

1μF

CER

105k

4-Switch Buck-Boost Controller

3780 TA01

DESCRIPTION

High Efﬁ ciency, Synchronous,

The LTC

ing regulator controller that operates from input voltages

above, below or equal to the output voltage. The constant

frequency current mode architecture allows a phase-lock-

able frequency of up to 400kHz. With a wide 4V to 30V

(36V maximum) input and output range and seamless

transfers between operating modes, the LTC3780 is ideal

for automotive, telecom and battery-powered systems.

The operating mode of the controller is determined through

the FCB pin. For boost operation, the FCB mode pin can

select among Burst Mode

and forced continuous mode. During buck operation, the

FCB mode pin can select among skip-cycle mode, discon-

tinuous mode and forced continuous mode. Burst Mode

operation and skip-cycle mode provide high efﬁ ciency

operation at light loads while forced continuous mode and

discontinuous mode operate at a constant frequency.

Fault protection is provided by an output overvoltage

comparator and internal foldback current limiting. A power

good output pin indicates when the output is within 7.5%

of its designed set point.

Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 5481178, 6304066, 5929620, 5408150, 6580258,

patent pending on current mode architecture and protection

100μF

16V

CER

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

330μF

16V

3780 is a high performance buck-boost switch-

12V

OUT

100

operation, discontinuous mode

Efﬁ ciency and Power Loss

OUT

= 12V, I

(V)

LTC3780

LOAD

= 5A

3780 TA01b

3780fe

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