LTC1709 2-Phase, 5-Bit Adjustable,High Efficiency, Synchronous Step-Down Switching Regulator
The LTC®1709 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at a optimum frequency for efficiency. Thermal design is also simplified. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications. The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipaton during short-circuit conditions when overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values
产品特点 Features
- Two Ouput Stages Operate Antiphase Reducing
Input Capacitance and Power Supply Noise
- 5-Bit VID Control (VRM 8.4 Compliant)
VOUT: 1.3V to 3.5V in 50mV/100mV Steps
- Current Mode Control Ensures Current Sharing
- True Remote Sensing Differential Amplifier
- OPTI-LOOP™ Compensation Minimizes COUT
- Programmable Fixed Frequency: 150kHz to
300kHz—Effective 300kHz to 600kHz Switching
Frequency
- ±1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Adjustable Soft-Start Current Ramping
- Internal Current Foldback
- Short-Circuit Shutdown Timer with Defeat Option
- Overvoltage Soft-Latch Eliminates Nuisance Trips
- Low Shutdown Current: 20µA
- Small 36-Lead Narrow (0.209
|
应用
- Desktop Computers
- Internet/Network Servers
- Large Memory Arrays
- DC Power Distribution Systems
- Battery Chargers
典型应用图
参数
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LTC1709 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) * |
| LTC1709EG |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG#PBF |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG#TR |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG#TRPBF |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-7 |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-7#PBF |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-7#TR |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-7#TRPBF |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-8 |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-8#PBF |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-8#TR |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-8#TRPBF |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-85 |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-85#PBF |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-85#TR |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-85#TRPBF |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-9 |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-9#PBF |
SSOP |
36 |
E |
$5.60 |
$4.75 |
| LTC1709EG-9#TR |
SSOP |
36 |
E |
|
$4.85 |
| LTC1709EG-9#TRPBF |
SSOP |
36 |
E |
|
$4.85 |
LTC1709 数据手册及相关资料下载
- 数据手册(英文) : LTC1709 - 2-Phase, 5-Bit Adjustable,High Efficiency, Synchronous Step-Down Switching Regulator.PDF
- 设计要点(英文) : Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors.PDF
- 设计要点 (英文) : DN216 - PolyPhase Surface Mount Power Supply Meets AMD Athlon Processor Requirements with No Heat Sink.PDF
- 设计要点 (英文) : DN225 - Low Cost, High Efficiency 42A DC/DC Converter.PDF
- 可靠性数据 : R384 Reliability Data .PDF
