LTC3609IWKG-TRPBF(RevB) データシートの表示（PDF） - Linear Technology

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LTC3609IWKG-TRPBF
(Rev.:RevB)

32V, 6A Monolithic Synchronous Step-Down DC/DC Converter

Linear Technology 

Features

n 6A Output Current

n Wide VIN Range = 4V to 32V (36V Maximum)

n Internal N-Channel MOSFETs

n True Current Mode Control

n Optimized for High Step-Down Ratios

n tON(MIN) ≤ 100ns

n Extremely Fast Transient Response

n Stable with Ceramic COUT

n ±1% 0.6V Voltage Reference

n Power Good Output Voltage Monitor

n Adjustable On-Time/Switching Frequency

n Adjustable Current Limit

n Programmable Soft-Start

n Output Overvoltage Protection

n Optional Short-Circuit Shutdown Timer

n Low Shutdown IQ: 15µA

n Available in a 7mm × 8mm 52-Pin QFN Package

Applications

n Point of Load Regulation

n Distributed Power Systems

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066.

LTC3609

32V, 6A Monolithic

Synchronous Step-Down

DC/DC Converter

Description

The LTC®3609 is a high efficiency, monolithic synchronous

step-down DC/DC converter that can deliver up to 6A output

current from a 4V to 32V (36V maximum) input supply. It

uses a valley current control architecture to deliver very

low duty cycle operation at high frequency with excellent

transient response. The operating frequency is selected

by an external resistor and is compensated for variations

in VIN and VOUT.

The LTC3609 can be configured for discontinuous or

forced continuous operation at light load. Forced continu-

ous operation reduces noise and RF interference while

discontinuous mode provides high efficiency by reducing

switching losses at light loads.

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and an optional

short-circuit shutdown timer. Soft-start capability for sup-

ply sequencing is accomplished using an external timing

capacitor. The regulator current limit is user programmable.

A power good output voltage monitor indicates when

the output is in regulation. The LTC3609 is available in a

compact 7mm × 8mm QFN package.

Typical Application

High Efficiency Step-Down Converter

0.1µF VOUT

100pF

1000pF

15.8k

VON

ION

RUN/SS VIN

LTC3609

SW

ITH

BOOST

187k

1.2µH

0.22µF

VIN

4V TO 32V

10µF

x3

100µF

x2

VOUT

2.5V

6A

SGND INTVCC

FCB

VRNG

PGOOD PGND

EXTVCC VFB

3609 TA01a

4.7µF

30.1k

9.53k

Efficiency and Power Loss

vs Load Current

100

90

EFFICIENCY

10000

80

1000

70

60

50

100

POWER LOSS

40

30

20

10 VOUT = 2.5V

0 EXTVCC = 5V

0.01

0.1

1

LOAD CURRENT (A)

10

VIN = 12V

VIN = 25V

1

10

3609 TA01b

3609fb



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