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LTC1695CS5 Datasheet

  • LTC1695CS5

  • SMBus/I2C Fan Speed Controller in SOT-23

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LTC1695
SMBus/I
2
C Fan Speed
Controller in SOT-23
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
Complete SMBus/I
2
C
TM
Brushless DC Fan Speed
Control System in a 5-Pin SOT-23 package
0.75鈩?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
2
C Interface
250ms Internal Timer Ensures Fan Start-Up
Current Limit and Thermal Shutdown
Fault Status Indication via SMBus Host Readback
The LTC
廬
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/I
2
C interface. Fan speed is controlled according to
the system鈥檚 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
2
C interface and a 6-bit DAC.
Fan speed is controlled by varying the fan鈥檚 terminal
voltage through the output voltage of the LTC1695鈥檚 linear
regulator. The LTC1695鈥檚 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鈥檚 boost start
feature that provides the DAC鈥檚 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.
APPLICATIO S
s
s
s
s
s
s
s
Notebook Computers
Spot Cooling
Portable Instruments
Battery-Powered Systems
DC Motor Control
White LED Power Supplies
Programmable Low Dropout Regulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
2
C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATION
5V
1
V
CC
V
OUT
5
LOAD CURRENT (mA)
Fan Voltage and Current vs DAC Code
120
100
80
I
LOAD
60
40
20
1695 鈥?TA01
V
CC
= 5V
T
A
= 25擄C
+
10碌F
2
LTC1695
GND
4
4.7碌F
+
5V DC FAN
SUNON
KDE0502PFB2-8
0.6W, 1.7 CFM
(25 鈥?25 鈥?10)mm
3
3
SYSTEM
CONTROLLER
SCL
SDA
0
0
10
U
6
5
OUTPUT VOLTAGE (V)
U
U
4
V
OUT
3
2
1
0
70
20
40
30
DAC CODE
50
60
1695 鈥?TA02
1

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