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MAX17101

Dual Quick-PWM, Step-Down Controller

with Low-Power LDO, RTC Regulator

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4243; Rev 0; 8/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX17101 is a dual Quick-PWM™ step-down

power-supply (SMPS) controller with synchronous rectifi-

cation, intended for main 5V/3.3V power generation in

battery-powered systems. Low-side MOSFET sensing

provides a simple low-cost, highly efficient current sense

for providing valley current-limit protection. Combined

with the output overvoltage and undervoltage protection

features, this current limit ensures robust output supplies.

The 5V/3.3V SMPS outputs can save power by operating

in pulse-skipping mode or in ultrasonic mode to avoid

audible noise. Ultrasonic mode forces the controller to

maintain switching frequencies greater than 20kHz at

light loads.

An internal 100mA linear regulator can be used to

either generate the 5V bias needed for power-up or

other lower power “always-on” suspend supplies. An

independent bypass input allows automatic bypassing

of the linear regulator when the SMPS is active.

This main controller also includes a secondary feed-

back input that triggers an ultrasonic pulse (DL1 turned

on) if the SECFB voltage drops below its threshold volt-

age. This refreshes an external charge pump driven by

DL1 without overcharging the output voltage.

The device includes independent shutdown controls to

simplify power-up and power-down sequencing. To

prevent current surges at startup, the internal voltage

target is slowly ramped up from zero to the final target

over a 1ms period. To prevent the output from ringing

below ground in shutdown, the internal voltage target

is ramped down from its previous value to zero over a

1ms period. Two independent power-good outputs

simplify the interface with external controllers.

The MAX17101 comes in a lead-free 32-pin TQFN

(5mm x 5mm) package and operates in the -40°C to

+85°C temperature range.

Features

Applications

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX17101ETJ+ -40°C to +85°C 32 Thin QFN-EP*

o Dual Quick-PWM

o Internal 100mA 5V or Adjustable Linear Regulator

o Independent LDO Bypass Input

o Internal Boost Diodes

o Secondary Feedback Input Maintains Charge Pump

o 3.3V 5mA RTC Power (Always On)

o OUT1: 5V or 1.5V Fixed or 0.7V Adjustable

Feedback

o OUT2: 3.3V or 1.05V Fixed or Dynamic Adjustable

o Dynamic 0 to 2V REFIN2 Input on Second Output

o 2V ±1% 50µA Reference

o 6V to 24V Input Range (28V max)

o Ultrasonic Mode

o Independent SMPS and LDO Enable Controls

o Independent SMPS Power-Good Outputs

o Minimal Component Count

Notebook Computers

Main System Supply (5V and 3.3V Supplies)

Graphic Cards

DDR1, DDR2, DDR3 Power Supplies

Game Consoles

Low-Power I/O and Chipset Supplies

Two to Four Li+ Cells Battery-Powered Devices

PDAs and Mobile Communicators

Telecommunication

MAX17101

THIN QFN

TOP VIEW

A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE.

TON

ONLDO

RTC

LDO

REF

DL2

AGND

SECFB

BST2

DL1

PGOOD2

4567

2324 22 20 19 18

SKIP

OUT2

ON1

PGOOD1

ILIM1

FB1

PGND

ILIM2

OUT1

REFIN2

BYP

ON2

DH1

DH2

LX1

LDOSEL

BST1

LX2

Pin Configuration

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

EVALUATION KIT

AVAILABLE

1 2 3 4 5 6 ... 29 30

MAX17101 1

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MAX17101COMPONENT400kHz/300kHz SMPS 1: 5V AT 5A SMPS 2: 3.3V AT 8A400kHz/500kHz SMPS 1: 5V AT 3A SMPS 2: 3.3V AT 5A400kHz/300kHz SMPS 1: 1.5V AT 8A

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MAX17101Dual Quick-PWM, Step-Down Controllerwith Low-Power LDO, RTC RegulatorMaxim cannot assume responsibility for use of any circuitry other than ci

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