LTC1695CS5 Linear Technology Corporation, LTC1695CS5 Datasheet

LTC1695CS5

Manufacturer Part Number

LTC1695CS5

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1695CS5-TRPBF.pdf (20 pages)

2.LTC1695CS5.pdf (20 pages)

3.LTC1695CS5.pdf (20 pages)

Specifications of LTC1695CS5

Case

SOT-153

Date_code

2008+

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC1695CS5

Manufacturer:

Quantity:

10 000

Current page: 1 of 20
Download datasheet (205Kb)

FEATURES

APPLICATIO S

TYPICAL

C is a trademark of Philips Electronics N.V.

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

Complete SMBus/I

Control System in a 5-Pin SOT-23 package

0.75 PMOS Linear Regulator with 180mA

Output Current Rating

0V to 4.922V Output Voltage Range Controlled by a

6-Bit DAC

Simple 2-Wire SMBus/I

250ms Internal Timer Ensures Fan Start-Up

Current Limit and Thermal Shutdown

Fault Status Indication via SMBus Host Readback

Notebook Computers

Spot Cooling

Portable Instruments

Battery-Powered Systems

DC Motor Control

White LED Power Supplies

Programmable Low Dropout Regulator

CONTROLLER

SYSTEM

APPLICATION

10 F

Brushless DC Fan Speed

GND

SCL

C Interface

LTC1695

SDA

OUT

4.7 F

5V DC FAN

SUNON

KDE0502PFB2-8

0.6W, 1.7 CFM

(25 • 25 • 10)mm

1695 • TA01

DESCRIPTIO

The LTC

tions necessary for a power management microprocessor

to regulate the speed of a 5V brushless DC fan via a 2-wire

SMBus/I

the system’s required temperature profile and permits

lower fan power consumption, longer battery run time and

lower acoustical generated noise versus systems that

only provide simple on-off control for the fan.

The LTC1695 incorporates a 180mA low dropout linear

regulator, a 2-wire SMBus/I

Fan speed is controlled by varying the fan’s terminal

voltage through the output voltage of the LTC1695’s linear

regulator. The LTC1695’s output voltage is programmed

by sending a 6-bit digital code to the LTC1695 DAC via the

SMBus. To eliminate fan start-up problems at lower fan

voltages, users can enable the LTC1695’s boost start

feature that provides the DAC’s full-scale output voltage

for 250ms before decreasing to the programmed output

voltage.

The LTC1695 includes output current limiting and thermal

shutdown as well as status monitors that can be read back

by the microprocessor during fault conditions. The

LTC1695 is available in a 5-lead SOT-23 package.

1695 fan speed controller provides all the func-

C interface. Fan speed is controlled according to

SMBus/I

120

100

Fan Voltage and Current vs DAC Code

Controller in SOT-23

= 25 C

= 5V

LOAD

DAC CODE

C Fan Speed

C interface and a 6-bit DAC.

OUT

LTC1695

1695 • TA02

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