LTC3853IUJ Linear Technology Corporation, LTC3853IUJ Datasheet

LTC3853IUJ

Manufacturer Part Number

LTC3853IUJ

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC3853EUJ.pdf (36 pages)

2.LTC3853IUJ.pdf (36 pages)

Specifications of LTC3853IUJ

Case

QFN

Date_code

10+

Available stocks

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Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

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Manufacturer:

Linear Technology

Quantity:

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3853IUJ#PBF

Manufacturer:

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Company:

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Part Number:

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Quantity:

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FEATURES

TYPICAL APPLICATION

L, LT, LTC, LTM and Burst Mode are registered trademarks 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.

Triple, 120° Phased Controllers Reduce Required

Input Capacitance and Power Supply Induced Noise

Conﬁ gurable as a 180° Dual Phase Controller Plus a

Single Phase Controller

The Third Phase Can Regulate Up to a 13.5V Output

High Efﬁ ciency: Up to 92%

±0.75% 0.8V Output Voltage Accuracy

Phase-Lockable Fixed Frequency 250kHz to 750kHz

Supports Pre-Biased Outputs

Dual N-Channel MOSFET Synchronous Drive

Wide V

Adjustable Soft-Start Current Ramping or Tracking

Foldback Output Current Limiting

Output Overvoltage Protection

Dual Power Good Output Voltage Monitors

40-Lead 6mm × 6mm QFN Package

SENSE

OUT1

or DCR Current Sensing

Range: 4.5V to 24V Operation (28V Abs Max)

100μF

10V

2.2μH

0.1μF

105k

2.2k

220pF

20k

15k

500kHz

1500pF

4.7μF

High Efﬁ ciency Triple 5V/3.3V/1.2V Step-Down Converter

TG1

PGOOD12

PGOOD3

SW1

BG1

MODE/PLLIN

SENSE1

SGND

LIM

TH1,2,3

FB1

FB3

–

TK/SS1,2,3

LTC3853

FREQ/PLLFLTR

BOOST1,2,3

0.1μF

RUN1,2,3

INTV

SENSE2

SENSE3

PGND

SW2

SW3

TG2

BG2

TG3

BG3

FB2

–

0.1μF

10k

SW1,2,3

10nF

DESCRIPTION

The LTC

down switching regulator controller that drives all N-chan-

nel synchronous power MOSFET stages. Power loss and

supply noise are minimized by operating the output stages

out of phase. The part can be conﬁ gured as a dual phase

controller plus a single phase controller if needed. The

part can also be conﬁ gured to provide a single 3-phase

output for even higher output currents.

A wide 4.5V to 24V (28V maximum) input voltage sup-

ply range encompasses most battery chemistries and

intermediate bus voltages. Phase 3 can regulate output

voltages up to 13.5V. A constant frequency current mode

architecture allows for a phase-lockable frequency up to

750kHz.

Independent TK/SS pins for each output ramps the output

voltages and can be conﬁ gured for coincident or ratiometric

tracking. Current foldback limits MOSFET heat dissipation

during short-circuit conditions. The MODE/PLLIN pin

selects among Burst Mode

continuous inductor current modes.

Multiphase Synchronous

20k

63.4k

3853 is a high performance triple output step-

2.2k

Step-Down Controller

2.2μH

0.1μF

100μF

3.3V

OUT2

Triple Output,

operation, pulse-skipping or

20k

0.1μF

22μF

50V

1μH

10k

7V TO 24V

LTC3853

100μF

1.2V

OUT3

3853f

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