MAX1717
Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs
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Industry's First Single-Chip Solution to Power Intel SpeedStep CPUs
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Features
- 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
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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.
Applications
- 2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
- 5V to CPU Core Supply Converters
- Notebook Computers with Intel SpeedStep® or Other Dynamically Adjustable Processors
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MAX1717
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Data Sheet
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MAX1717: Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs Data Sheet (Rev.3)
Documentation
Software & Part Ecosystem
Evaluation Kits 1
MAX1717EVKIT
Evaluation Kit for the MAX1717
Features and Benefits
- High Speed, Accuracy, and Efficiency
- Voltage-Positioned Output
- Lowest Output Capacitor Count (4)
- Reduces CPU Power Consumption
- Fast-Response Quick-PWM™ Architecture
- 7V to 24V Input Voltage Range
- 0.925V to 2V Output Voltage Range
- 12A Load-Current Capability (14.1A peak)
- Controlled Input Surge Current During Output Transition
- 300kHz Switching Frequency
- No Current-Sense Resistor
- VGATE Power-Good/Transition-Complete Indicator
- 24-Pin QSOP Package
- Low-Profile Components
- Fully Assembled and Tested
Product Detail
The MAX1717 evaluation kit (EV kit) demonstrates a high-power, dynamically adjustable notebook CPU application circuit. The MAX1717 DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage CPU core VCC rail. The MAX1717 EV kit meets the Intel mobile Pentium® III CPU's transient voltage specification by using voltage positioning to minimize output capacitor requirements.
This fully assembled and tested circuit board provides a digitally adjustable 0.925V to 2V output voltage from a 7V to 24V battery input range. It delivers up to 12A output current with 14.1A peak current. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response. Output slew-rate control minimizes battery and inductor surge currents. With its precision timer circuit, the MAX1717's output voltage slew rate can be tailored to a given application, providing “just-in-time” arrival at the new DAC setting.
Applications
- 2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
- 5V to CPU Core Supply Converters
- Notebook Computers with Intel SpeedStep® or Other Dynamically Adjustable Processors