ltc3730 Linear Technology Corporation, ltc3730 Datasheet

ltc3730

Manufacturer Part Number

ltc3730

Description

3-phase, 5-bit Intel Mobile Vid, 600khz, Synchronous Buck Controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3730.pdf (28 pages)

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FEATURES

■

APPLICATIO S

TYPICAL APPLICATIO

■

3-Phase Current Mode Controller with Onboard

MOSFET Drivers

±5% Output Current Match Optimizes Thermal

Performance and Size of Inductors and MOSFETs

Operational Amplifier Accomodates Mode Switching

±1% V

Reduced Input and Output Capacitance

Reduced Power Supply Induced Noise

±10% Power Good Output Indicator

250kHz to 600kHz Per Phase, PLL, Fixed Frequency

PWM, Stage Shedding

OPTI-LOOP

Adjustable Soft-Start Current Ramping

4V, V

Short-Circuit Shutdown Timer with Defeat Option

Overvoltage Soft Latch

Small 36-Lead Narrow (0.209”) SSOP Package

Tablet Computers

High Performance Notebook Computers

High Output Current DC/DC Power Supplies

OUT

Programmable from 0.6V to 1.75V (IMVP III)

REF

, Undervoltage RUN/SS Reset/Reattempt Circuit

Accuracy Over Temperature

Compensation Minimizes C

4.5V TO 7V

POWER GOOD INDICATOR

OPTIONAL SYNC IN

or Burst Mode

10µF

0.1µF

Figure 1. High Current Triple Phase Step-Down Converter

5 VID BITS

SW3 SW2 SW1

680pF

0.1µF

100pF

OUT

Operation

BOOST1

BOOST2

BOOST3

PGOOD

PLLIN

PLLFLTR

VID0-VID4

RUN/SS

SGND

EAIN

AMPOUT

–

LTC3730

SENSE1

SENSE2

SENSE3

PGND

Synchronous Buck Controller

SW1

SW2

SW3

TG1

BG1

TG2

BG2

TG3

BG3

–

DESCRIPTIO

The LTC

switching regulator controller that drives all N-channel

external power MOSFET stages in a phase-lockable fixed

frequency architecture. The 3-phase controller drives its

output stages with 120° phase separation at frequencies of

up to 600kHz per phase to minimize the RMS losses in both

the input and output filter capacitors. The 3-phase tech-

nique effectively triples the fundamental frequency, im-

proving 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 Burst Mode technology.

An internal operational amplifier provides mode selectable

output voltage programming in conjunction with the inter-

nal VID voltage control DAC.

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

protect the MOSFETs and the load. Current foldback

provides protection for the external MOSFETs under

short-circuit or overload conditions.

OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology Corporation.

Stage Shedding is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners. Protected by U.S. Patents including 5481178,

5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6462525, 6304066, 5705919.

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

1µH

3730 is a PolyPhase

0.003Ω

Mobile VID, 600kHz,

3-Phase, 5-Bit Intel

470µF

2.5V

22µF

35V

1.2V

50A

OUT

3730 F01

5V TO 28V

synchronous step-down

LTC3730

3730fa

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