Rainbow-electronics MAX8815A Uživatelský manuál stáhnout pdf

General Description

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.

Applications

DSC and DVC

Microprocessor/DSP Core Power

Cell Phones, PDAs, MP3 Players

Portable Handheld Devices

PCMCIA Cards

Features

♦ Up to 97% Efficiency with Internal Synchronous

Rectifier

♦ Low 30µA Quiescent Current

♦ Guaranteed 500mA Output Current at V

OUT

= 5V

from 1.8V Input

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

Input

♦ Low-Noise Constant Frequency Operation (FPWM

Mode)

♦ 2MHz PWM Switching Frequency

♦ Preset (5V) or Adjustable Output

♦ Controlled Current in Soft-Start Limits Inrush

Current

♦ True Shutdown

♦ Internal Compensation

♦ Overload/Short-Circuit Protection

♦ 0.1µA Shutdown Current

♦ Thermal Shutdown

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

MAX8815A

1A, 97% Efficiency, 30µA Quiescent Current

Step-Up Converter with True Shutdown

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4092; Rev 0; 5/08

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.

EVALUATION KIT

AVAILABLE

PART PIN-PACKAGE TOP MARK

MAX8815AETB+ 10 TDFN-EP* AUH

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

Denotes a lead-free package.

EP = Exposed pad.

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

operating temperature range.

BATT

SKIPB

POUT

OUTS

GND

INPUT VOLTAGE

1.2V TO 5.5V

OUTPUT VOLTAGE

5V UP TO 1A

MAX8815A

Typical Operating Circuit

TOP VIEW

SKIPB

OUTS

GND

POUT

BATT

MAX8815A

Pin Configuration

1 2 3 4 5 6 ... 11 12

MAX8815A 1

Shrnutí obsahu

Strany 1 - MAX8815A

General DescriptionThe MAX8815A DC-DC step-up converter is a high-effi-ciency, low quiescent current, synchronous step-upconverter with True Shutdown™

Strany 2

MAX8815ADC-DC ConverterThe MAX8815A uses a current-mode PWM controlscheme. The voltage difference between FB and aninternal 1.265V (typ) reference gen

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True ShutdownDrive ON low to place the MAX8815A in shutdown modeand reduce supply current to 0.1µA (typ).In shutdown, the control circuitry, internal

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True ShutdownInductor SelectionIn most step-up converter designs, a reasonabl

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown2 ______________________________________________________________

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown________________________________________________________________

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown4 ______________________________________________________________

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown________________________________________________________________

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown6 ______________________________________________________________

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MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown________________________________________________________________

Strany 11

MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown8 ______________________________________________________________

Strany 12

MAX8815A1A, 97% Efficiency, 30µA Quiescent CurrentStep-Up Converter with True Shutdown________________________________________________________________

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Procházejte online nebo si stáhněte Uživatelský manuál pro Senzory Rainbow-electronics MAX8815A. Rainbow Electronics MAX8815A User Manual Uživatelská příručka

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