MAX8717
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MAX8717

Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers

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Dual, Step-Down, Interleaved, Fixed-Frequency, Switch-Mode Power-Supply (SMPS) Controllers with Synchronous Rectification for Notebook Computers

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Info: : PRODUCTION tooltip
Part Models 2
1ku List Price
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Features
  • Fixed Switching Frequency
    • 200kHz, 300kHz, or 500kHz
    • 250kHz, 300kHz, or 400kHz (MAX8756 Only)
  • No Current-Sense Resistor Required
  • 40/60 Optimal Interleaving
  • Reduced Input-Capacitor Requirement
  • Output Voltage Fixed or Adjustable Outputs (Dual Mode™)
    • 3.3V/5V Fixed or 1V to 5.5V Adjustable
    • 1.5V/1.8V Fixed or 1V to 2.3V Adjustable (MAX8756 Only)
  • 4V to 26V Input Range
  • Independently Selectable PWM, Skip, and Low-Noise Mode Operation
  • Soft-Start and Soft-Stop
  • 2V Precision Reference with 0.75% Accuracy
  • Independent Power-Good Outputs
Additional Details
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The MAX8716/MAX8717/MAX8756/MAX8757 are dual, step-down, interleaved, fixed-frequency, switch-mode power-supply (SMPS) controllers with synchronous rectification. The MAX8716/MAX8717/MAX8756/MAX8757 are intended for main (5V/3.3V) power generation, while the MAX8756 is optimized for I/O power rails in battery-powered systems.

Fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before duty-cycle overlap occurs in 5V/3.3V applications, compared to 180° out-of-phase regulators where the duty-cycle overlap occurs when the input drops below 10V.

Accurate output current limit is achieved using a sense resistor. Alternatively, power dissipation can be reduced using lossless inductor current sensing. Independent ON/OFF controls and power-good signals allow flexible power sequencing. Soft-start reduces inrush current, while soft-stop gradually ramps the output voltage down preventing negative voltage dips.

A low-noise mode maintains high light-load efficiency while keeping the switching frequency out of the audible range.

The MAX8716 is available in a 24-pin thin QFN package, and the MAX8717/MAX8756/MAX8757 are available in a 28-pin thin QFN package.

Applications

  • 2 to 4 Li+ Cell Battery-Powered Devices
  • Main or I/O Power Supplies
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators
Part Models 2
1ku List Price
price unavailable

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX8717ETI+
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

MAX8717ETI+

PRODUCTION

MAX8717ETI+T

PRODUCTION

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Jun 20, 2016

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ASSEMBLY

MAX8717ETI+

PRODUCTION

MAX8717ETI+T

PRODUCTION

Software & Part Ecosystem

Evaluation Kits 1

MAX8716EVKIT

Evaluation Kit for the MAX8716

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MAX8716EVKIT

Evaluation Kit for the MAX8716

Evaluation Kit for the MAX8716

Features and Benefits

  • +6V to +24V Input Voltage Range
  • Output Voltages
    +3.3V at 5A (Adjustable from +1.0V to +5.5V)
    +5.0V at 5A (Adjustable from +1.0V to +5.5V)
  • 300kHz Switching Frequency
  • Independently Selectable PWM, Skip, and Low- Noise-Mode Operation
  • Independent Power-Good Outputs
  • Low-Profile Components
  • Fully Assembled and Tested
  • Product Detail

    The MAX8716 evaluation kit (EV kit) demonstrates the MAX8716's standard application circuit. This dual-PWM synchronous DC-DC converter steps down high-voltage batteries and/or AC adapters, generating main supplies for notebook computers.

    The MAX8716 EV kit provides dual +5V and +3.3V output voltages from +6V to +24V battery input range. It delivers up to 5A output current for the +5V output and 5A for the +3.3V output with 95% efficiency. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response.

    This EV kit is a fully assembled and tested circuit board. Both outputs are adjustable between +1.0V and +5.5V by changing feedback resistors R19, R20, R21, and R22.

    Applications

    • 2 to 4 Li+ Cell Battery-Powered Devices
    • Main or I/O Power Supplies
    • Notebook and Subnotebook Computers
    • PDAs and Mobile Communicators

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