LTC1695CS5 Linear Technology Corporation, LTC1695CS5 Datasheet

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LTC1695CS5

Manufacturer Part Number
LTC1695CS5
Description
Manufacturer
Linear Technology Corporation
Datasheets

Specifications of LTC1695CS5

Case
SOT-153
Date_code
2008+

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1695CS5
Manufacturer:
LT
Quantity:
10 000
FEATURES
APPLICATIO S
I
TYPICAL
2
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
+
U
5V
2
C
TM
1
2
3
2
Brushless DC Fan Speed
V
GND
SCL
C Interface
CC
LTC1695
V
SDA
U
OUT
5
4
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.
3
®
2
1695 fan speed controller provides all the func-
C interface. Fan speed is controlled according to
SMBus/I
120
100
80
60
40
20
Fan Voltage and Current vs DAC Code
0
Controller in SOT-23
0
V
T
A
CC
= 25 C
10
= 5V
U
20
I
LOAD
2
DAC CODE
30
2
C Fan Speed
C interface and a 6-bit DAC.
40
V
50
OUT
LTC1695
60
70
1695 • TA02
6
5
4
3
2
1
0
1

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