ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet

ltc3869gn-2

Manufacturer Part Number

ltc3869gn-2

Description

Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3869GN-2.pdf (40 pages)

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

OUT1

Dual, 180° Phased Controllers Reduce Required

Input Capacitance and Power Supply Induced Noise

Accurate Multiphase Current Matching

±0.75% 0.6V Output Voltage Accuracy

Phase-Lockable Fixed Frequency 250kHz to 780kHz

High Efficiency: Up to 95%

Dual N-channel MOSFET Synchronous Drive

Wide V

Adjustable Soft-Start Current Ramping or Tracking

Foldback Output Current Limiting

Output Overvoltage Protection

Power Good Output Voltage Monitor

5V Low Dropout Regulator

Small 28-Lead QFN and Narrow SSOP Packages

Server Systems

Telecom Systems

Industrial and Medical Instruments

High Power Battery-Operated Devices

DC Power Distribution Systems

SENSE

3.2µH

47µF

147k

OUT

or DCR Current Sensing

Range: 4V to 38V (40V Max) Operation

Range: 0.6V to 12.5V Operation

20k

4.7µF

High Efficiency Dual 5V/3.3V Step-Down Converter

15k

500kHz

0.1µF

470pF

MODE/PLLIN

TG1

BOOST1

SW1

BG1

SENSE1

RUN1

SENSE1

0.1µF

LIM

TH1

FB1

TK/SS1

–

LTC3869

PGOOD

SGND

TK/SS2

INTV

SENSE2

BOOST2

PGND

RUN2

0.1µF

FREQ

SW2

TG2

BG2

TH2

FB2

–

122k

0.1µF

1µF

15k

470pF

DESCRIPTION

The LTC

step-down switching regulator controller that drives all

N-channel synchronous power MOSFET stages. A constant

frequency current mode architecture allows a phase-

lockable frequency of up to 780kHz. Power loss and noise

due to the ESR of the input capacitors are minimized by

operating the two controller output stages out-of-phase.

OPTI-LOOP

to be optimized over a wide range of output capacitance

and ESR values. The LTC3869 features a precision 0.6V

reference and a power good output indicator. A wide 4V

to 38V input supply range encompasses most battery

chemistries. Independent TK/SS pins for each controller

ramp the output voltage during start-up. Current foldback

limits MOSFET heat dissipation during short-circuit condi-

tions. The MODE/PLLIN pin selects among Burst Mode

operation, pulse-skipping mode, or continuous inductor

current mode and allows the IC to be synchronized to an

external clock.

The LTC3869 is pin compatible with LTC3850 and is available

in both low profile 28-lead QFN and narrow SSOP packages.

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

are registered trademarks and No R

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

5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6580258, 6498466, 6611131.

20k

90.9k

3869 TA01

2.2µH

22µF

Synchronous Step-Down

7V TO

24V

3869 is a high performance dual synchronous

56µF

3.3V

OUT2

compensation allows the transient response

LTC3869/LTC3869-2

DC/DC Controllers

SENSE

100

is a trademark of Linear Technology Corporation. All

0.01

Efficiency and Power Loss

Dual, 2-Phase

EFFICIENCY

= 12V, V

LOAD CURRENT (A)

0.1

OUT

= 3.3V

= 5V

POWER LOSS

3869 TA01b

1300

1200

1100

1000

900

800

700

600

500

400

3869f

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