General Description

The MAX1790/MAX8715 boost converters incorporate

high-performance (at 1.2MHz), current-mode, fixed-fre-

quency, pulse-width modulation (PWM) circuitry with a

built-in 0.21

Ω/0.15Ω n-channel MOSFET to provide a high-

ly efficient regulator with fast response.

High switching frequency (640kHz or 1.2MHz selectable)

allows easy filtering and faster loop performance. An

external compensation pin provides the user flexibility in

determining loop dynamics, allowing the use of small, low

equivalent-series-resistance (ESR) ceramic output capaci-

tors. The device can produce an output voltage as high as

12V from an input as low as 2.6V.

Soft-start is programmed with an external capacitor, which

sets the input-current ramp rate. In shutdown mode, cur-

rent consumption is reduced to 0.1µA. The MAX1790/

package. The ultra-small package and high switching fre-

quency allow the total solution to be less than 1.1mm high.

Applications

LCD Displays

PCMCIA Cards

Portable Applications

Hand-Held Devices

Features

♦ 90% Efficiency

♦ 1.6A, 0.21Ω, 14V Power MOSFET (MAX1790)

♦ 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715)

♦ +2.6V to +5.5V Input Range

♦ Pin-Selectable 640kHz or 1.2MHz Switching

Frequency

♦ 0.1µA Shutdown Current

♦ Programmable Soft-Start

♦ Small 8-Pin µMAX Package

Low-Noise Step-Up DC-DC Converters

________________________________________________________________ Maxim Integrated Products

1

IN

LX

GND

1

2

8

7

SS

FREQ

FB

COMP

μMAX

TOP VIEW

3

4

6

5

MAX1790

MAX8715

SHDN

LX

IN

2.6V TO 5V

GND

FREQ

COMP

SHDN

FB

MAX1790

MAX8715

ON/OFF

SS

Typical Operating Circuit

19-1563; Rev 3; 9/05

Pin Configuration

Ordering Information

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX1790EUA

-40°C to +85°C

8 µMAX

MAX1790EUA+

-40°C to +85°C

8 µMAX

MAX8715EUA

-40°C to +85°C

8 µMAX

MAX8715EUA+

-40°C to +85°C

8 µMAX

µMAX is a registered trademark of Maxim Integrated Products,

Inc.

+ Denotes lead-free package.