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MyMaxim 订阅
主要特征
- Quick-PWM Architecture
- ±1% VOUT Accuracy Over Line and Load
- 5-Bit On-Board DAC with Input Mux
- Precision-Adjustable VOUT Slew Control
- 0.925V to 2V Output Adjust Range
- Supports Voltage-Positioned Applications
- 2V to 28V Battery Input Range
- Requires a Separate +5V Bias Supply
- 200/300/550/1000kHz Switching Frequency
- Over/Undervoltage Protection
- Drives Large Synchronous-Rectifier FETs
- 700µA (typ) ICC Supply Current
- 2µA (typ) Shutdown Supply Current
- 2V ±1% Reference Output
- VGATE Transition-Complete Indicator
- Small 24-Pin QSOP Package
应用/用途
- 从2节至4节Li+电池产生CPU核电源的转换器
- 5V至CPU核电源转换器
- 带有Intel SpeedStep®或其它动态可调处理器的笔记本电脑
描述
The MAX1717 step-down controller is intended for core CPU DC-DC converters in notebook computers. It features a dynamically adjustable output, ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns Instant-on" response to load transients while maintaining a relatively constant switching frequency.
The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.925V to 2V range. A unique feature of the MAX1717 is an internal multiplexer (mux) that accepts two 5-bit DAC settings with only five digital input pins. Output voltage transitions are accomplished with a proprietary precision slew-rate control that minimizes surge currents to and from the battery while guaranteeing "just-in-time" arrival at the new DAC setting.
High DC precision is enhanced by a two-wire remote-sensing scheme that compensates for voltage drops in the ground bus and output voltage rail. Alternatively, the remote-sensing inputs can be used together with the MAX1717's high DC accuracy to implement a voltage-positioned circuit that modifies the load-transient response to reduce output capacitor requirements and full-load power dissipation.
Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.
The MAX1717 is available in a 24-pin QSOP package.
The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.925V to 2V range. A unique feature of the MAX1717 is an internal multiplexer (mux) that accepts two 5-bit DAC settings with only five digital input pins. Output voltage transitions are accomplished with a proprietary precision slew-rate control that minimizes surge currents to and from the battery while guaranteeing "just-in-time" arrival at the new DAC setting.
High DC precision is enhanced by a two-wire remote-sensing scheme that compensates for voltage drops in the ground bus and output voltage rail. Alternatively, the remote-sensing inputs can be used together with the MAX1717's high DC accuracy to implement a voltage-positioned circuit that modifies the load-transient response to reduce output capacitor requirements and full-load power dissipation.
Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.
The MAX1717 is available in a 24-pin QSOP package.
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