LTC1705 Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
The LTC®1705 is a complete power supply controller for Intel Mobile Pentium processors. It includes two switching regulator controllers, each designed to drive a pair of N-channel MOSFETs in a voltage mode feedback, synchronous buck configuration, to provide the core and I/O supplies. The core controller includes a 5-bit DAC that conforms to the Intel Mobile VID specification. The IC also includes a low dropout linear regulator (LDO) that delivers up to 150mA of output current to provide the CLK supply. The LTC1705 uses a constant-frequency 550kHz PWM architecture, minimizing external component size and cost, as well as optimizing load transient performance. It provides better than 1.25% DC accuracy at its core output, and 2% at I/0 and CLK outputs. The high performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD flag indicates that all three outputs are within ±10% of their regulated values. A shutdown circuit disables all three outputs if the RUN/SS pin is pulled to ground. In this mode, the LTC1705 supply current drops to below 100µA
产品特点 Features
- Three Regulated Outputs: Core, I/O and CLK in One Package
- Integrated Intel Mobile 5-Bit VID DAC
- No External Current Sense Resistors
- All N-Channel External MOSFET Architecture
- 550kHz Switching Frequency Minimizes External Component Size and Cost
- Integrated 150mA LDO linear Regulator
- Excellent DC Accuracy: 1.25% for Core, 2% for I/O and CLK Supplies
- PGOOD Flag Monitors All Three Outputs
- High Efficiency Over Wide Load Current Range
- Low Shutdown Current: < 100µA
- Switchers Run Out-of-Phase to Minimize CIN
- Small 28-Pin Narrow SSOP Package
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应用
- Complete Power Supply Controller for Intel Mobile Pentium® Processors
- Intel Mobile Pentium Core, I/O, Clock Supplies
- Multiple Logic Supply Generator
典型应用图
参数
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LTC1705 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) * |
| LTC1705EGN |
SSOP |
28 |
E |
$6.00 |
$5.35 |
| LTC1705EGN#PBF |
SSOP |
28 |
E |
$6.00 |
$5.35 |
| LTC1705EGN#TR |
SSOP |
28 |
E |
|
$5.36 |
| LTC1705EGN#TRPBF |
SSOP |
28 |
E |
|
$5.36 |
LTC1705 数据手册及相关资料下载
- 数据手册(英文) : LTC1705 - Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO.PDF
- 设计要点 (英文) : DN311 - Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
- 设计要点 (中文) : DN311 Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
- 可靠性数据 : R384 Reliability Data .PDF
