LTC1998 LINER [Linear Technology], LTC1998 Datasheet

LTC1998

Manufacturer Part Number

LTC1998

Description

2.5uA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC1998.pdf (12 pages)

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Part Number:

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Company:

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Part Number:

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Manufacturer:

Quantity:

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Part Number:

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Manufacturer:

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FEATURES

APPLICATIONS

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

a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

BLOCK DIAGRAM

HYST.A

TH.A

High Accuracy Trip Voltage: 1% Max Error Using

External 1% Resistors

Adjustable Threshold Voltage and Hysteresis

Quiescent Current: 2.5μA Typ

Output Swings Rail-to-Rail

Thresholds Programmable from 2.5V to 3.25V

Output State Guaranteed for V

Low Proﬁ le (1mm) ThinSOT™ Package

Lithium-Ion Battery-Powered Equipment

PDAs

Cell Phones

Handheld Instruments

Battery Packs

Pagers

Palm Top Computers

POS Terminals

THRESHOLD

ADJUST

BATT

1.1R

1.2V

BATT

≥1.5V

SOT-23 Comparator and Voltage

Reference for Battery Monitoring

BATTLO

1998 BD

LOGIC

DESCRIPTION

The LTC

adjustable reference in a 6-pin SOT-23 package that is

optimized for lithium-ion low battery detection circuits.

The LTC1998 features a voltage detection circuit with an

adjustable threshold voltage and hysteresis. The threshold

voltage can be programmed from 2.5V to 3.25V with two

external resistors. A 10mV to 750mV hysteresis can be

added with a third external resistor.

A proprietary internal architecture maintains 1% thresh-

old voltage accuracy over temperature with low cost 1%

external resistors.

A separate power supply pin, V

logic output to operate below the battery voltage, allowing

compatibility with low voltage microprocessors without a

pull-up resistor. Power supply glitches are eliminated by

preventing the cross-conducting current which occurs

when the output changes state.

The LTC1998 operates with battery or supply voltages

up to 5.5V and its battery-low output is valid for battery

voltages above 1.5V.

1998 is a micropower comparator and a precision

Threshold Voltage Error vs Temperature

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

–45

2.5µA, 1% Accurate

THRESHOLD = 3V

TH.A

–25

= 1V

–5

TEMPERATURE (°C)

TO GROUND,

THRESHOLD = 2.5V

TH.A

LOGIC,

SHORTED

EXTERNAL R,

THRESHOLD = 3V

TH.A

allows the battery-low

SET BY 1%

LTC1998

1998 TA02

1998fa

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