MAX8815A Maxim Integrated Products, MAX8815A Datasheet

MAX8815A

Manufacturer Part Number

MAX8815A

Description

Step-Up Converter

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8815A.pdf (12 pages)

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The MAX8815A DC-DC step-up converter is a high-effi-

ciency, low quiescent current, synchronous step-up

converter with True Shutdown™ and inrush-current lim-

iting. The MAX8815A generates any output voltage

from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell

Li+/Li polymer battery.

The MAX8815A uses two modes of operation. The first

mode of operation (normal) uses only 30µA (typ) quies-

cent current and allows the converter to switch only

when needed at no load and light loads. Under moder-

ate and heavy loads (typically above 90mA), the

MAX8815A uses a fixed-frequency pulse-width modula-

tion (PWM) technique. This mode allows maximum effi-

ciency at light loads. The second mode of operation is

a fixed-frequency forced-pulse-width modulation

(FPWM) mode where the converter switches at a fixed

frequency irrespective of the load. This mode allows for

easy noise filtering and lower output ripple.

The MAX8815A has a preset 2.5A current limit, allowing

500mA load at 1.8V input and 1A load at 2.5V input when

the output is set to 5V. Features include soft-start, which

limits inrush current during startup, True Shutdown, and

internal compensation. The MAX8815A is available in a

compact 10-pin, 3mm x 3mm TDFN package.

The MAX8815A evaluation kit can help shorten the time

required for system design.

19-4092; Rev 0; 5/08

True Shutdown is a trademark of Maxim Integrated Products, Inc.

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.

DSC and DVC

Microprocessor/DSP Core Power

Cell Phones, PDAs, MP3 Players

Portable Handheld Devices

PCMCIA Cards

1A, 97% Efficiency, 30µA Quiescent Current

TOP VIEW

________________________________________________________________ Maxim Integrated Products

Step-Up Converter with True Shutdown

General Description

MAX8815A

EVALUATION KIT

AVAILABLE

Pin Configuration

Applications

♦ Up to 97% Efficiency with Internal Synchronous

♦ Low 30µA Quiescent Current

♦ Guaranteed 500mA Output Current at V

♦ Guaranteed 1A Output Current at 5V from 2.5V

♦ Low-Noise Constant Frequency Operation (FPWM

♦ 2MHz PWM Switching Frequency

♦ Preset (5V) or Adjustable Output

♦ Controlled Current in Soft-Start Limits Inrush

♦ True Shutdown

♦ Internal Compensation

♦ Overload/Short-Circuit Protection

♦ 0.1µA Shutdown Current

♦ Thermal Shutdown

♦ Compact 10-Pin, 3mm x 3mm TDFN Package

+ Denotes a lead-free package.

* EP = Exposed pad.

Note: This device operates in the -40°C to +85°C extended

operating temperature range.

MAX8815AETB+

INPUT VOLTAGE

Rectifier

from 1.8V Input

Input

Mode)

Current

1.2V TO 5.5V

PART

Typical Operating Circuit

BATT

SKIPB

Ordering Information

PIN-PACKAGE

10 TDFN-EP*

MAX8815A

POUT

OUTS

GND

Features

TOP MARK

OUT

OUTPUT VOLTAGE

5V UP TO 1A

AUH

= 5V

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