MAX8716, MAX8717, MAX8756, MAX8757 Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers

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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.

Key Features

Applications/Uses

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

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

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Freq. (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX8716

Step-Down

4.5

3.3

5.5

1.3

Yes

300

Yes

THIN QFN/24

MAX8717

500

THIN QFN/28
THIN QFN/32

$3.85 @ 1k

MAX8757

500

THIN QFN/28
THIN QFN/32

See All Switch-Mode DC-DC Power Supplies (413)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.