LTC1695 SMBus/I²C Fan Speed Controller in SOT-23
The LTC®1695 fan speed controller provides all the functions 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
产品特点 Features
- Complete SMBus/I²C™ Brushless DC Fan Speed
Control System in a 5-Pin SOT-23 package
- 0.75Ohms 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/I²C Interface
- 250ms Internal Timer Ensures Fan Start-Up
- Current Limit and Thermal Shutdown
- Fault Status Indication via SMBus Host Readback
参数
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应用
- Notebook Computers
- Spot Cooling
- Portable Instruments
- Battery-Powered Systems
- DC Motor Control
- White LED Power Supplies
- Programmable Low Dropout Regulator
典型应用图
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LTC1695 订购信息和价格参考Package Variations and Pricing
| 器件型号 |
封装 |
引脚 |
温度 |
价格 (以 1 ~ 99 片为批量) |
价格 (以 1000 片为批量) * |
| LTC1695CS5 |
SOT |
5 |
C |
$1.81 |
|
| LTC1695CS5#PBF |
SOT |
5 |
C |
$1.81 |
|
| LTC1695CS5#TR |
SOT |
5 |
C |
$1.81 |
$1.51 |
| LTC1695CS5#TRM |
SOT |
5 |
C |
$1.81 |
$1.53 |
| LTC1695CS5#TRMPBF |
SOT |
5 |
C |
$1.81 |
$1.53 |
| LTC1695CS5#TRPBF |
SOT |
5 |
C |
$1.81 |
$1.51 |
LTC1695 数据手册及相关资料下载
- 数据手册(英文) : LTC1695 - SMBus/I²C Fan SpeedController in SOT-23.PDF
- 设计要点 (英文) : DN238 - SOT-23 SMBus Fan Speed Controller Extends Battery Life and Reduces Noise.PDF
- 可靠性数据 : R421 Reliability Data .PDF
