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General Description

The MAX1716/MAX1854/MAX1855 step-down con-

trollers are intended for core CPU DC-DC converters in

notebook computers. They feature a dynamically

adjustable output (5-bit DAC), ultra-fast transient

response, high DC accuracy, and high efficiency need-

ed for leading-edge CPU core power supplies. Maxim's

proprietary Quick-PWM™ quick-response, constant-on-

time PWM control scheme handles wide input/output

voltage ratios with ease and provides 100ns “instant-on”

response to load transients while maintaining a relative-

ly constant switching frequency.

The MAX1716/MAX1854/MAX1855 are designed

specifically for CPU core applications requiring a volt-

age-positioned supply. The voltage-positioning input

(VPS), combined with a high DC accuracy control loop,

is used to implement a power supply that modifies its

output set point in response to the load current. This

arrangement decreases full-load power dissipation and

reduces the required number of output capacitors.

The 28V input range of the MAX1716/MAX1854/MAX1855

enables single-stage buck conversion from high-volt-

age batteries for the maximum possible efficiency.

Alternatively, the devices’ high-frequency capability

combined with two-stage conversion (stepping down

the +5V system supply instead of the battery) allows

the smallest possible physical size. The output voltage

can be dynamically adjusted through the 5-bit digital-

to-analog converter (DAC) inputs.

The MAX1716/MAX1854/MAX1855 are available in a

24-pin QSOP package. For applications requiring

SpeedStep™ power control (see the MAX1717).

________________________Applications

Notebook Computers

Docking Stations

CPU Core Supply

Single-Stage (BATT to V

CORE

) Converters

Two-Stage (+5V to V

CORE

) Converters

Features

♦ High-Efficiency Voltage Positioning

♦ Quick-PWM Architecture

♦ ±1% V

OUT

Line-Regulation Accuracy

♦ Adjustable Output Range (5-Bit DAC)

MAX1716: 0.925V to 1.6V

MAX1854: 0.925V to 2.0V

MAX1855: 0.600V to 1.75V

♦ 2V to 28V Input Range

♦ 200/300/400/550kHz Switching Frequency

♦ Output Undervoltage Protection

♦ Overvoltage Protection (MAX1716/MAX1855)

♦ Drive Large Synchronous-Rectifier MOSFETs

♦ 1.7ms Digital Soft-Start

♦ 700µA I

Supply Current

♦ 1µA Shutdown Supply Current

♦ 2V ±1% Reference Output

♦ V

GATE

Transition-Complete Indicator

♦ Small 24-Pin QSOP Package

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

________________________________________________________________ Maxim Integrated Products 1

19-1758; Rev 0; 8/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Pin Configuration appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products.

SpeedStep is a trademark of Intel Corp.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1716EEG -40°C to +85°C 24 QSOP

MAX1854EEG -40°C to +85°C 24 QSOP

MAX1855EEG -40°C to +85°C 24 QSOP

Typical Operating Circuit

VGATE

VPS

BST

+5V INPUT

REF

ILIM

SKIP

GND

PGND

MAX1716

MAX1854

MAX1855

TON

V+

SHDN

OUTPUT

DAC

INPUTS

BATTERY

2V TO 28V

1 2 3 4 5 6 ... 32 33

MAX1716/MAX1854/MAX1855 1

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General DescriptionThe MAX1716/MAX1854/MAX1855 step-down con-trollers are intended for core CPU DC-DC converters innotebook computers. They feature a

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MAX1716/MAX1854/MAX1855High-Speed, Adjustable, Synchronous Step-DownControllers with Integrated Voltage PositioningPackage InformationQSOP.EPSMaxim ca

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