MAX1710
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs
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Digitally Adjustable Step-Down Controller Powers 12A Mobile Processors with Only Four Output Capacitors
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Features
- Ultra-High Efficiency
- No Current-Sense Resistor (Lossless ILIMIT)
- Quick-PWM with 100ns Load-Step Response
- ±1% VOUT Accuracy over Line and Load
- 4-Bit On-Board DAC (MAX1710)
- 5-Bit On-Board DAC (MAX1711/MAX1712)
- 0.925V to 2V Output Adjust Range (MAX1711/MAX1712)
- 2V to 28V Battery Input Range
- 200/300/400/550kHz Switching Frequency
- Remote GND and VOUT Sensing
- Over/Undervoltage Protection
- 1.7ms Digital Soft-Start
- Drive Large Synchronous-Rectifier FETs
- 2V ±1% Reference Output
- Power-Good Indicator
- Small 24-Pin QSOP Package
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The MAX1710/MAX1711 step-down controllers are intended for core CPU DC-DC converters in notebook computers. They feature a triple-threat combination of 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.
High DC precision is ensured by a 2-wire remote-sensing scheme that compensates for voltage drops in both the ground bus and supply rail. An on-board, digital-to-analog converter (DAC) sets the output voltage in compliance with Mobile Pentium II® CPU specifications.
The MAX1710 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous-rectifier MOSFETs.
Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, 2-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.
The MAX1710/MAX1711 are identical except that the MAX1711 have 5-bit DACs and the MAX1710 has a 4-bit DAC. Also, the MAX1711 has a fixed overvoltage protection threshold at VOUT = 2.25V and undervoltage protection at VOUT = 0.8V whereas the MAX1710 has variable thresholds that track VOUT. The MAX1711 is intended for applications where the DAC code may change dynamically.
Applications
- CPU Core DC-DC Converters
- Docking Stations
- Notebook Computers
- Single-Stage (BATT to VCORE) Converters
- Two-Stage (+5V to VCORE) Converters
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MAX1710
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Data Sheet
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MAX1710-MAX1712: High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs Data Sheet (Rev.1)
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Software & Part Ecosystem
Evaluation Kits 1
MAX1711EVKIT
Voltage-Positioning Evaluation Kit for the MAX1711
Features and Benefits
- High Speed, Accuracy, and Efficiency
- Fast-Response Quick-PWM™ Architecture
- 7V to 24V Input Voltage Range
- 1.25V to 2V Output Voltage Range
- 7A Peak Load-Current Capability (5.5A Continuous)
- 93% Efficient (VOUT = 2V, VBATT = 7V, ILOAD = 4A)
- 300kHz Switching Frequency
- No Current-Sense Resistor
- Remote GND and VOUT Sensing
- Power-Good Output
- 24-Pin QSOP Package
- Low-Profile Components
- Fully Assembled and Tested
Product Detail
The MAX1711 evaluation kit (EV kit) demonstrates the high-power, dynamically adjustable notebook CPU application circuit with voltage positioning. Voltage positioning decreases CPU power consumption and reduces output capacitance requirements. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage CPU core VCC rail.
The MAX1711 EV kit provides a digitally adjustable 0.925V to 2V output voltage from a 7V to 24V battery input range. It delivers sustained output current of 12A and 14.1A peaks, operating at a 550kHz switching frequency, and has superior line- and load-transient response. The MAX1711 EV kit is designed to accomplish output voltage transitions in a controlled amount of time with limited input surge current.
This EV kit is a fully assembled and tested circuit board.
Applications
- CPU Core DC-DC Converters
- Docking Stations
- Notebook Computers
- Single-Stage (BATT to VCORE) Converters
- Two-Stage (+5V to VCORE) Converters