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Features
- 1-Phase Quick-PWM Controller
- ±6mV VOUT Accuracy Over Line, Load, and Temperature
- 6-Bit Graphics DAC (12.5mV LSB)
- Active Voltage Positioning with Adjustable Gain
- Accurate Droop and Current Limit
- Remote Output and Ground Sense
- Buffered 2V Reference Output for Offsets
- Power-Good Window Comparator
- Temperature Comparator
- Drives Large Synchronous Rectifier FETs
- 2V to 26V Power Input Range
- Adjustable Switching Frequency (600kHz max)
- Output Overvoltage and Undervoltage Protection
- Soft-Startup and Soft-Shutdown
- Internal Boost Diodes
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The MAX17409 is a 1-phase Quick-PWM™ step-down VID power-supply controller for high-performance graphics processors. The Quick-PWM control provides instantaneous response to fast-load current steps. Active voltage positioning reduces power dissipation and bulk output capacitance requirements and allows ideal positioning compensation for tantalum, polymer, or ceramic bulk output capacitors.
The MAX17409 is intended for two different notebook processor core applications: either bucking down the battery directly to create the core voltage, or bucking down the +5V system supply. The single-stage conversion method allows this device 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 higher switching frequency provides the minimum possible physical size.
A slew-rate controller allows controlled transitions between VID codes. A thermistor-based temperature sensor provides programmable thermal protection. The MAX17409 is available in a 28-pin, 4mm x 4mm TQFN package.
Applications
- 2- to 4-Li+ Cells Battery to Processor Core Supply Converters
- Graphics Core (GPU) Power Supplies
- Notebooks/Desktops/Servers
- Voltage-Positioned Step-Down Converters
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Documentation
Software & Part Ecosystem
Evaluation Kits 1
MAX17409EVKIT
Evaluation Kit for the MAX17409
Features and Benefits
- 1-Phase, Fast-Response Quick-PWM™
- Active Voltage Positioning with Adjustable Gain—Independent DC and Transient Control
- High Speed, Accuracy, and Efficiency
- Low-Bulk Output-Capacitor Count
- 7V to 24V Input-Voltage Range
- 0.3375V to 1.1250V Output-Voltage Range (6-Bit DAC)
- 14A Load-Current Capability
- 300kHz Switching Frequency
- Power-Good (PWRGD) Indicator
- Thermal Fault (Active-Low VRHOT) Output
- Output Overvoltage and Undervoltage Fault Protections
- 28-Pin Thin QFN Package (4mm x 4mm)
- Fully Assembled and Tested
Product Detail
The MAX17409 evaluation kit (EV kit) demonstrates the high-power, dynamically adjustable, 1-phase application circuit for NVIDIA® graphics power supplies. This DC-DC converter is intended to either step down high-voltage batteries and/or the 5V system supply, generating a precision, low-voltage CPU core. The MAX17409 EV kit meets the NVIDIA transient voltage specification, power-good signaling, voltage-regulator thermal monitoring (active-low VRHOT), and power-good output (PWRGD). The MAX17409 EV kit includes active voltage positioning with adjustable gain, reducing power dissipation and bulk output-capacitance requirements. An internal amplifier buffers the DAC and accurately controls the slew rate for all output-voltage transitions, including transitions between VID codes, startup, and shutdown. Precision slew-rate control provides just-in time arrival at the new DAC setting, minimizing surge currents to and from the battery.
The MAX17409 includes output undervoltage fault, over-voltage fault, and thermal overload protection. It also includes a voltage-regulator power-good (PWRGD) output.
This fully assembled and tested PCB provides a digitally adjustable 0.3375V to 1.1250V output voltage (6-bit on-board DAC) from a 7V to 24V battery-input range. It delivers up to 14A output current. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response.
Applications
- 2- to 4-Li+ Cells Battery to Processor Core Supply Converters
- Graphics Core (GPU) Power Supplies
- Notebooks/Desktops/Servers
- Voltage-Positioned Step-Down Converters