LTC3738 Linear Technology, LTC3738 Datasheet

LTC3738

Manufacturer Part Number

LTC3738

Description

3-Phase Buck Controller

Manufacturer

Linear Technology

Datasheet

1.LTC3738.pdf (32 pages)

Available stocks

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Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3738CUHF

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Quantity:

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Meier Automation Equipment Co., Limited

Part Number:

LTC3738CUHF

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FEATURES

APPLICATIO S

■

U.S. Patent Numbers: 5481178, 5994885, 5929620, 6177787, 6144194, 6580258, 6462525,

6593724, 6674274, 6100678 pending on AVP technique.

TYPICAL APPLICATIO

3-Phase Controller with Onboard MOSFET Drivers

Programmable Active Voltage Positioning (AVP)

with True Current Sensing

Programmable External Thermal Detection or

Internal Thermal Sensing

Precise Output Current Matching Optimizes

Thermal Performance and Solution Size

Supports Starting into Precharged V

Differential Amplifier Accurately Senses V

PWM, Pulse Skip and Stage Shedding

Synchronizable

210kHz to 530kHz Per Phase, Fixed Frequency

Output Power Good Indicator with Adaptive Blanking

Adjustable Soft-Start Current Ramping

Short-Circuit Shutdown Timer with Defeat Option

OPTI-LOOP

38-Lead (5mm × 7mm) QFN Package

High Performance Notebook Computers

Servers, Desktop Computers and Workstations

Compensation Minimizes C

MODE SELECTION/SYNC IN

POWER GOOD INDICATOR

VR HOT INDICATOR

THERMAL INPUT

ON/OFF

10µF

0.1µF

100pF

SW3 SW2 SW1

680pF

OUTS

0.1µF

Operation

OUT

VRM10 Step-Down Controller

BOOST1

BOOST2

BOOST3

PGOOD

FCB/SYNC

PLLFLTR

TSNS

VR_HOTB

OUTEN

SGND

EAIN

AVP

–

LTC3738

VID0-VID5

SENSE1

SENSE2

SENSE3

PGND

SW1

SW2

SW3

BG1

BG2

BG3

TG1

TG2

TG3

–

DESCRIPTIO

The LTC

ing regulator controller that drives all N-channel external

power MOSFET stages in a phase-lockable, fixed fre-

quency architecture. The 3-phase technique effectively

triples the fundamental frequency, improving transient

response while operating each controller at an optimal

frequency for efficiency and ease of thermal design. Light

load efficiency is optimized by using a choice of output

Stage Shedding or Pulse Skip mode technology.

The LTC3738 also allows users to program load slope via

a resistor for AVP control. Both external and internal

thermal sensing are available from the on-chip thermal

detector and comparator.

A differential amplifier provides sensing of both the high

and low sides of the output voltage.

Soft-start and a defeatable, timed short-circuit shutdown

protect the MOSFETs and the load. A foldback current

circuit also provides protection for the external MOSFETs

under short-circuit or overload conditions. An all- “1” VID

detector turns off the regulator after a 1µs timeout.

OPTI-LOOP is a registered trademark of Linear Technology Corporation.

Stage Shedding is a trademark of Linear Technology Corporation.

for Intel VRM9/VRM10 with

Active Voltage Positioning

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

6 VID BITS

3-Phase Buck Controller

0.8µH

3738 is a 3-phase synchronous step-down switch-

0.002Ω

3738 TA01

470µF

×4

22µF

×2

0.8375V TO 1.6000V

OUT

5V TO 28V

LTC3738

3738f

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