LTC1728 データシートの表示（PDF） - Linear Technology

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LTC1728

Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages

Linear Technology 

LTC1727/LTC1728

FEATURES

Micropower Precision

Triple Supply Monitors in 8-Lead MSOP

and 5-Lead SOT-23 Packages

DESCRIPTION

n Monitors Three Inputs Simultaneously

LTC1727-5: 5V, 3.3V and ADJ

LTC1727-2.5: 2.5V, 3.3V and ADJ

LTC1728-5: 5V, 3.3V and ADJ

LTC1728-2.5: 2.5V, 3.3V and ADJ

LTC1728-1.8: 3V, 1.8V and ADJ

LTC1728-3.3: 3.3V, 1.8V and ADJ

n ±1.5% Threshold Accuracy Over Temperature

n Very Low Supply Current: 10µA Typ

n 200ms Reset Time Delay

n Active Low RESET Output

n Power Supply Glitch Immunity

n Guaranteed RESET for VCC3 ≥ 1V

or VCC5/VCC25/VCC18 ≥ 1V

n LTC1727 Includes Monitor Output for Each Supply

n LTC1727: 8-Lead MSOP and SO Packages

n LTC1728: 5-Lead SOT-23 Package

APPLICATIONS

n Desktop Computers

n Notebook Computers

n Intelligent Instruments

n Portable Battery-Powered Equipment

n Network Servers

The LTC®1727 is a triple supply monitor intended for

systems with multiple supply voltages. Each supply moni-

tor has its own open-drain output for individual supply

monitoring. A common open-drain reset output remains

low until all three supplies have been in compliance for

200ms. Tight 1.5% accuracy specifications and glitch

immunity ensure reliable reset operation without false

triggering.

The LTC1728 is functionally identical to the LTC1727

without the individual monitor outputs.

The RST output is guaranteed to be in the correct state

for VCC5/VCC25/VCC18 or VCC3 down to 1V. The LTC1727/

LTC1728 may also be configured to monitor any one or

two VCC inputs instead of three, depending on system

requirements.

Very low (10µA typical) supply current makes the LTC1727/

LTC1728 ideal for power conscious systems.

The LTC1727 is available in an 8-lead MSOP or SO pack-

age and the LTC1728 is available in a 5-lead SOT-23

package.

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

3.3V

DC/DC 5V

CONVERTER 1.8V

SYSTEM

LOGIC

0.1µF

0.1µF

61.9k

1%

100k

1%

VCC3

RST

LTC1728-5

VCC5

VCCA

GND

1727/28 TA01

Triple Supply Monitor with Power Good Output

(3.3V, 2.5V and Adjustable)

ADJUSTABLE

SUPPLY

3.3V

2.5V

R1

R2

LTC1727-2.5

VCC3 COMP3

VCC25 COMP25

VCCA

RST

10k 10k

POWER

GOOD

SYSTEM

RESET

GND COMPA

1727/28 TA08

For more information www.linear.com/LTC1727

17278fd

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