MAX8719 Maxim Integrated Products, MAX8719 Datasheet

MAX8719

Manufacturer Part Number

MAX8719

Description

(MAX8718 / MAX8719) High-Voltage / Low-Power Linear Regulators for Notebook Computers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8719.pdf (10 pages)

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Download datasheet (186Kb)

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

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.

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.

High-Voltage, Low-Power Linear Regulators for

CMOS/RTC Backup Power

Microcontroller Power

Notebook Computers

Smart-Battery Packs

PDAs and Handy-Terminals

Battery-Powered Systems

________________________________________________________________ Maxim Integrated Products

General Description

< 28V) such as smart batter-

Applications

♦ 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

MAX8718ETA -40°C to +85°C

MAX8719ETA -40°C to +85°C

Notebook Computers

PART

TOP VIEW

() ARE FOR THE MAX8719.

5/3 (FB)

TEMP RANGE PIN-PACKAGE

GND

Ordering Information

3mm × 3mm

MAX8718

MAX8719

TDFN

Pin Configuration

8 TDFN 3mm x

3mm

8 TDFN 3mm x

3mm

OUT

I.C.

SHDN

PGOOD

Features

VOLTAGE

Adjustable

OUTPUT

3.3V/5V

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