LTC1695CS5 datasheet(1/20 Pages) LINER

Nome de Peças	LTC1695CS5

Descrição Electrónicos	SMBus/I2C Fan Speed Controller in SOT-23

PDF	20 Pages

Scroll/Zoom	100%

Fabricante Electrônico	LINER [Linear Technology]

Página de início	http://www.linear.com

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1 / 20 page

LTC1695

1

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATION

The LTC

®1695 fan speed controller provides all the func-

tions necessary for a power management microprocessor

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

SMBus/I2C interface. Fan speed is controlled according to

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/I2C interface and a 6-bit DAC.

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.

s

Notebook Computers

s

Spot Cooling

s

Portable Instruments

s

Battery-Powered Systems

s

DC Motor Control

s

White LED Power Supplies

s

Programmable Low Dropout Regulator

s

Complete SMBus/I2C

TM Brushless DC Fan Speed

Control System in a 5-Pin SOT-23 package

s

0.75

Ω PMOS Linear Regulator with 180mA

Output Current Rating

s

0V to 4.922V Output Voltage Range Controlled by a

6-Bit DAC

s

Simple 2-Wire SMBus/I2C Interface

s

250ms Internal Timer Ensures Fan Start-Up

s

Current Limit and Thermal Shutdown

s

Fault Status Indication via SMBus Host Readback

SMBus/I2C Fan Speed

Controller in SOT-23

LTC1695

15

2

3

4

VCC

GND

SCL

VOUT

SDA

+

SYSTEM

CONTROLLER

+

4.7

µF

10

µF

5V DC FAN

SUNON

KDE0502PFB2-8

0.6W, 1.7 CFM

(25 • 25 • 10)mm

3

5V

1695 • TA01

Fan Voltage and Current vs DAC Code

DAC CODE

0

120

100

80

60

40

20

0

6

5

4

3

2

1

0

30

50

1695 • TA02

10

20

40

60

70

VCC = 5V

TA = 25°C

ILOAD

VOUT

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

I2C is a trademark of Philips Electronics N.V.

Nº de peça semelhante - LTC1695CS5

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Linear Technology	LTC1695	215Kb / 20P	SMBus/IC Fan Speed Controller in SOT-23

More results

Descrição semelhante - LTC1695CS5

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Maxim Integrated Produc...	MAX6650	315Kb / 25P	Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface Rev 2; 12/01
SMSC Corporation	EMC1001	317Kb / 16P	1.5째C SMBus Temperature Sensor in Miniature SOT-23
Maxim Integrated Produc...	MAX6650	241Kb / 25P	Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface Rev 4; 7/10
Maxim Integrated Produc...	MAX6650	284Kb / 25P	Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface Rev 5; 12/12
Linear Technology	LTC1695	215Kb / 20P	SMBus/IC Fan Speed Controller in SOT-23
Texas Instruments	TMP100	886Kb / 30P	TMP10x Temperature Sensor With I2C and SMBus Interface with Alert Function in SOT-23 Package
Maxim Integrated Produc...	MAX6650	260Kb / 25P	Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface Rev 5; 12/12
Texas Instruments	TMP100-Q1	414Kb / 29P	Temperature Sensor With I2C and SMBus Interface with Alert Function in SOT-23 Package
Analog Devices	DC1613A	309Kb / 8P	I2C/SMBUS/PMBUS Controller
Maxim Integrated Produc...	MAX6641	474Kb / 17P	SMBus-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller Rev 1; 4/06

More results

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