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

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 26
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 500
Package/Pins TQFN/28
Budgetary
Price (See Notes)
5.98
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 26
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 500
Package/Pins TQFN/28
Budgetary
Price (See Notes)
5.98

Key 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX8716, MAX8717, MAX8756, MAX8757: Standard Application Circuit MAX8716, MAX8717, MAX8756, MAX8757: Standard Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.