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General Description

The MAX8718/MAX8719 are micropower, 8-pin TDFN

linear regulators that supply always-on, keep-alive

power to CMOS RAM, real-time clocks (RTC), and

microcontrollers in systems with high-voltage batteries.

The circuits consist of a 100mA linear regulator and a

power-good comparator (PGOOD) with fixed-output

delay. Key features include wide input voltage range,

low-dropout voltage, and low-quiescent supply current.

Despite a miserly 25µA (max) no-load quiescent cur-

rent, the MAX8718/MAX8719 have good line- and load-

transient response and excellent AC power-supply

rejection. They provide a clean fixed 5V or 3.3V output

(MAX8718), or an adjustable 1.24V to 28V output

(MAX8719), even when subjected to fast supply-volt-

age changes that occur during the switchover from bat-

tery to AC-adapter input power. The space-saving

TDFN package has excellent thermal characteristics

and tolerates up to 1951mW of power dissipation.

Internal foldback current limiting and thermal shutdown

protect the regulator from overload and thermal faults.

In addition to the main notebook-computer application,

these devices are useful in other low-power, high-volt-

age applications (4V < V

< 28V) such as smart batter-

ies, current control loops, telecom emergency power,

and housekeeping power for off-line supplies.

The MAX8718/MAX8719 are available in a thermally

enhanced 3mm x 3mm, 8-lead TDFN package.

Applications

CMOS/RTC Backup Power

Microcontroller Power

Notebook Computers

Smart-Battery Packs

PDAs and Handy-Terminals

Battery-Powered Systems

Features

♦ 4V to 28V Input Range

♦ 18µA Quiescent Supply Current

♦ <3µA Shutdown Supply Current

♦ 100mA Output Current

♦ 3.3V or 5V, Pin-Selectable Output (MAX8718)

♦ Adjustable 1.24V to 28V Output (MAX8719)

♦ ±2% Output Accuracy

♦ Thermal-Overload Protection

♦ Delayed Power-Good Output

♦ Thermally Enhanced 8-Pin TDFN Package

MAX8718/MAX8719

High-Voltage, Low-Power Linear Regulators for

Notebook Computers

________________________________________________________________ Maxim Integrated Products 1

TDFN

3mm × 3mm

TOP VIEW

SHDN

PGOOD

OUT

I.C.

GND

5/3 (FB)

MAX8718

MAX8719

() ARE FOR THE MAX8719.

Pin Configuration

Ordering Information

19-3495; Rev 0; 11/04

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.

PART

TEMP RANGE

PIN-PACKAGE

OUTPUT

VOLTAGE

MAX8718ETA

-40°C to +85°C

8 TDFN 3mm x

3mm

3.3V/5V

MAX8719ETA

-40°C to +85°C

8 TDFN 3mm x

3mm

Adjustable

1 2 3 4 5 6 7 8 9 10

MAX8718/MAX8719 1
Notebook Computers 1

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Página 1 - Notebook Computers

General DescriptionThe MAX8718/MAX8719 are micropower, 8-pin TDFNlinear regulators that supply always-on, keep-alivepower to CMOS RAM, real-time clock

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook ComputersMaxim cannot assume responsibility for use of any circuitry other than c

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers2 ______________________________________________________________________

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers________________________________________________________________________

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers4 ______________________________________________________________________

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers________________________________________________________________________

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers6 ______________________________________________________________________

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MAX8718/MAX8719High-Voltage, Low-Power Linear Regulators forNotebook Computers________________________________________________________________________

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MAX8718/MAX8719Current LimitOutput current is limited to 210mA (typ). The currentlimit exceeds the 100mA (min) safe operating limit. Theoutput can be

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Ratings). The thermal resistance junction-to-case of theTDFN package is 41°C/W, and the maximum safe junc-tion temperature is +150°C.The GND pin and b

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Rainbow-electronics MAX8719 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Acessórios para ar Rainbow-electronics MAX8719. Rainbow Electronics MAX8719 User Manual Manual do Utilizador

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