MAX8716 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX8716

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

Maxim Integrated 

19-3569; Rev 1; 6/05

EVAALVUAAILTAIOBNLEKIT

Interleaved High-Efficiency, Dual Power-Supply

Controllers for Notebook Computers

General Description

The MAX8716/MAX8717/MAX8757 are dual, step-

down, interleaved, fixed-frequency, switch-mode

power-supply (SMPS) controllers with synchronous rec-

tification. They are intended for main (5V/3.3V) and I/O

power generation in battery-powered systems.

Fixed-frequency operation with optimal interleaving

minimizes input ripple current from the lowest input volt-

ages up to the 26V maximum input. Optimal 40/60 inter-

leaving allows the input voltage to go down to 8.3V

before duty-cycle overlap occurs, 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 out-

put voltage down preventing negative voltage dips.

A low-noise mode maintains high light-load efficiency

while keeping the switching frequency out of the audi-

ble range.

The MAX8716 is available in a 24-pin thin QFN pack-

age, and the MAX8717/MAX8757 are available in a 28-

pin thin QFN package.

Applications

2 to 4 Li+ Cell Battery-Powered Devices

Notebook and Subnotebook Computers

PDAs and Mobile Communicators

Main or I/O Power Supplies

Dual Mode is a trademark of Maxim Integrated Products, Inc.

Features

♦ Fixed 200kHz, 300kHz, or 500kHz Switching

Frequency

♦ No Current-Sense Resistor Required

♦ 40/60 Optimal Interleaving

♦ Reduced Input-Capacitor Requirement

♦ 3.3V and 5V fixed or 1.0V to 5.5V Adjustable

Outputs (Dual Mode™)

♦ 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

Ordering Information

PART

TEMP RANGE

MAX8716ETG -40°C to +85°C

MAX8716ETG+ -40°C to +85°C

MAX8717ETI -40°C to +85°C

MAX8717ETI+ -40°C to +85°C

MAX8757ETI+ -40°C to +85°C

+Denotes lead-free package.

PIN-PACKAGE

24 Thin QFN 4mm x 4mm

24 Thin QFN 4mm x 4mm

28 Thin QFN 5mm x 5mm

28 Thin QFN 5mm x 5mm

28 Thin QFN 5mm x 5mm

Pin Configurations

TOP VIEW

TOP VIEW

18 17 16 15 14 13

DH1 19

BST1 20

CSH1 21

CSL1 22

FB1 23

PGOOD1 24

MAX8716ETG

12 DH2

11 BST2

10 CSH2

9 CSL2

8 FB2

7 PGOOD2

123 4 56

TQFN

21 20 19 18 17 16 15

DH1 22

14 DH2

BST1 23

13 BST2

CSH1 24

12 CSH2

CSL1 25

FB1 26

MAX8717ETI

MAX8757ETI+

11 CSL2

10 FB2

PGOOD1 27

9 PGOOD2

ILIM1 28

8 ILIM2

123456 7

TQFN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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