Rainbow-electronics MAX16024 Manual de usuario descargar pdf

General Description

The MAX16023/MAX16024 low-power battery-backup cir-

cuits with a regulated output are capable of delivering up

to 100mA output current. The MAX16023/MAX16024

include a low-dropout regulator, a microprocessor (µP)

reset circuit, and a battery switchover circuit. Additional

available features include a manual reset, a power-fail

comparator, and a battery-on indicator. These devices

reduce the number of external components to minimize

board space and improve reliability.

The MAX16023/MAX16024 are ideally suited for provid-

ing power for backing up critical memory such as static

random-access memory (SRAM) or real-time clocks

(RTCs). The regulated output is powered by V

when it

is present and switches over to the backup power dur-

ing brownout. The MAX16023/MAX16024 accept an

input voltage from 1.53V to 5.5V and provide fixed stan-

dard output voltages of 1.2V, 1.8V, 2.5V, 3.0V, and 3.3V.

The MAX16024 offers the ability to externally set the out-

put voltage using a resistive divider. All outputs are

available with push-pull or open-drain configurations.

The MAX16023 offers a power-fail comparator for monitor-

ing an additional voltage or for providing an early power-

fail warning. Another feature includes a manual-reset input

(MAX16023/MAX16024). The MAX16024 also features

a battery-on indicator and chip-enable gating function.

The MAX16023/MAX16024 are offered in 8- and 10-pin

TDFN packages and are fully specified from -40°C to

+85°C temperature range.

Applications

Main/Backup Power for RTCs/SRAM

Industrial Controls

GPS Systems

Set-Top Boxes

Point-of-Sale Equipment

Portable/Battery Equipment

Features

o System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V

Power-Supply Voltages

o 100mA Low-Dropout Regulator

o Factory-Trimmed and Adjustable Output Voltages

o 1.53V to 5.5V Operating Voltage Range

o Low-Power Consumption: 4µA (typ)

o Power-Fail Comparators for Monitoring Voltages

Down to 0.6V

o Battery-On Indicator

o Battery Freshness Seal

o On-Board Gating of CE Signals, 1.5ns

Propagation Delay (MAX16024)

o Debounced Manual-Reset Input

o 145ms (min) Reset Timeout Period

o Tiny 8-Pin and 10-Pin TDFN Packages

o UL

Certified to Conform to IEC60950-1

MAX16023/MAX16024

Battery-Backup Circuits with

Regulated Output Voltage

________________________________________________________________

Maxim Integrated Products

19-4249; 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.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX16023_TA_ _ _+T

-40°C to +85°C

8 TDFN-EP*

MAX16024_TB_ _ _+T

-40°C to +85°C

10 TDFN-EP*

The first placeholder “_” designates reset output options. A letter

“L” in this placeholder indicates a push-pull output and letter “P”

indicates an open-drain output. The next placeholder “_” desig-

nates the reset threshold (Table 1). The last two placeholders

“_ _” designate output voltage (Table 2). For the MAX16024 with

adjustable output voltage version, there are no last two place-

holders.

Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

EP = Exposed pad.

Pin Configurations

8 7 6 5

1 2 3 4

PFO

GND

*EP *EP

*EP = EXPOSED PAD

RESET

OUT

PFI

BATT

MAX16023

TDFN

10 9 8 7

1 2 3 4

GND

OUT

RESET

CEOUT

BATT

CEIN

BATT ONSET

MAX16024

TDFN

UL is a registered trademark of Underwriters Laboratories, Inc.

1 2 3 4 5 6 ... 16 17

Indice de contenidos

Pagina 1 - Regulated Output Voltage

General DescriptionThe MAX16023/MAX16024 low-power battery-backup cir-cuits with a regulated output are capable of delivering upto 100mA output curren

Pagina 2

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage10 ______________________________________________________________________________

Pagina 3

Detailed DescriptionThe Typical Applications Circuit shows a typical con-nection using the MAX16024. OUT powers the SRAM. IfVCCis higher than the rese

Pagina 4

MAX16023/MAX16024Manual-Reset Input(MAX16023/MAX16024)Many µP-based products require manual-reset capabili-ty, allowing the operator, a test technicia

Pagina 5

Applications InformationThe MAX16023/MAX16024 are protected for typicalshort-circuit conditions of 10s or less. Shorting OUT toground for longer than

Pagina 6

MAX16023/MAX16024Operation Without a BackupPower SourceThe MAX16023/MAX16024 provide battery-backupfunctions. If a backup power source is not used, co

Pagina 7

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage_________________________________________________________________________________

Pagina 8

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage16 ______________________________________________________________________________

Pagina 9

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output VoltageMaxim cannot assume responsibility for use of any circuitry other than circuitry

Pagina 10

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage2 _______________________________________________________________________________

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MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage_________________________________________________________________________________

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MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage4 _______________________________________________________________________________

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MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage_________________________________________________________________________________

Pagina 14

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage6 _______________________________________________________________________________

Pagina 15

OUTPUT VOLTAGEvs. VCC VOLTAGEMAX16023 toc13VCC VOLTAGE (V)OUTPUT VOLTAGE (V)142.12.52.72.82.02.41.91.81.71.62.22.32.61.50623 5MAX16024PTBS25+IOUT = 0L

Pagina 16

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage8 _______________________________________________________________________________

Pagina 17

MAX16023/MAX16024Battery-Backup Circuits withRegulated Output Voltage_________________________________________________________________________________

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