LTC3875 datasheet(1/46 Pages) LINER

Part #	LTC3875

Description	Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

PDF	46 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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1 / 46 page

LTC3875

1

3875fb

For more information www.linear.com/LTC3875

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Dual, 2-Phase, Synchronous

Controller with Low Value DCR Sensing

and Temperature Compensation

The LTC®3875 is a dual output current mode synchronous

step-down DC/DC controller that drives all N-channel

synchronous power MOSFET stages. It employs a unique

architecture which enhances the signal-to-noise ratio of

the current sense signal, allowing the use of very low DC

resistance power inductors to maximize the efficiency in

high current applications. This feature also reduces the

switching jitter commonly found in low DCR applications.

The LTC3875 features two high speed remote sense differ-

ential amplifiers, programmable current sense limits from

10mVto30mVandDCRtemperaturecompensationtolimit

the maximum output current precisely over temperature.

Auniquethermalbalancingfunctionadjustsperphasecur-

rent in order to minimize the thermal stress for multichip

single output applications. The LTC3875 also features a

precise0.6Vreferencewithguaranteedaccuracyof±0.5%

thatprovidesanaccurateoutputvoltagefrom0.6Vto3.5V.

A 4.5V to 38V input voltage range allows it to support a

wide variety of bus voltages. The LTC3875 is available

in a low profile 40-lead 6mm × 6mm (0.5mm pitch) and

40-lead 5mm × 5mm (0.4mm pitch) QFN packages.

High Efficiency Dual Phase 1.2V/60A Step-Down Converter

APPLICATIONS

n

Low Value DCR Current Sensing

n

Programmable DCR Temperature Compensation

n

±0.5% 0.6V Output Voltage Accuracy

n

Dual True Remote Sensing Differential Amplifiers

n

Optional Fast Transient Operation

n

Phase-Lockable Fixed Frequency 250kHz to 720kHz

n

Dual, 180° Phased Controllers Reduce Required

Input Capacitance and Power Supply Induced Noise

n

Dual N-Channel MOSFET Synchronous Drive

n

Wide VIN Range: 4.5V to 38V Operation

n

Output Voltage Range with Low DCR: 0.6V to 3.5V,

without Low DCR: 0.6V to 5V

n

Adjustable Soft-Start Current Ramping or Tracking

n

Foldback Output Current Limiting

n

Clock Input and Output for Up to 12-Phase Operation

n

Short-Circuit Soft Recovery

n

Output Overvoltage Protection

n

Power Good Output Voltage Monitor

n

40-Lead QFN Packages

n

Servers and Instruments

n

Telecom Systems

n

DC Power Distribution Systems

L

, LT, LTC, LTM, Linear Technology, the Linear logo OPTI-LOOP, Burst Mode and PolyPhase

are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents

including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.

+

INTVCC

4.7µF

LTC3875

BOOST1

BOOST2

SW2

0.3µH

(0.32m DCR)

BG2

PGND

TRSET2

SNSA2+

SNS2–

SNSD2+

TCOMP2

FREQ

VOSNS2+

VOSNS2–

ITH2

SW1

EXTVCC

BG1

TAVG

TRSET1

SNSA1+

SNS1–

SNSD1+

TCOMP1

VOSNS1+

VOSNS1–

ITH1

PHASMD

CLKOUT

PGOOD

IFAST

MODE/PLLIN

TG2

RUN1,2

ILIM

ENTMPB

TG1

VIN

TK/SS2

TK/SS1

THERMAL

SENSOR

22µF

16V

×4

VIN

6V TO 14V

0.3µH

(0.32m DCR)

THERMAL

SENSOR

(OPTIONAL)

122k

0.1µF

470µF

2.5V

×2

SP

+

470µF

2.5V

×2

SP

VOUT

15k

20k

3875 TA01a

20k

VOUT

1.2V

60A

1500pF

LOAD CURRENT (A)

0

70

75

80

85

90

100

10

20

30

40

3875 TA01b

50

60

95

0

4

2

6

8

10

14

12

0.32m

1.5m

0.32m PLOSS

1.5m PLOSS

12VIN

1.8VO

~400kHz

CCM

Efficiency and Power Loss

vs Load Current

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LTC3875 Datasheet(PDF) 1 Page - Linear Technology

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