LTC1443/LTC1444/LTC1445

1

144345fe

Typical applicaTion

DescripTion

Ultralow Power Quad

Comparators with Reference

comparators with a built-in reference. The comparators

feature less than 8.5µA supply current over temperature,

an internal reference (1.182V ±1% for LTC1443 or 1.221V

±1% for LTC1444/LTC1445), programmable hysteresis

(LTC1444/LTC1445) and TTL/CMOS output (LTC1443/

LTC1445) that sinks and sources current (open-drain

output for LTC1444). The reference output can drive a

bypass capacitor of up to 0.01µF without oscillation.

The comparators operate from a single 2V to 11V supply

or a dual ±1V to ±5.5V supply (LTC1443). Comparator

hysteresis is easily programmable using two resistors and

the HYST pin (LTC1444/LTC1445). Each comparator’s

input operates from the negative supply to within 1.3V of

the positive supply. The LTC1443/LTC1445 comparator

output stage can continuously source up to 40mA. By

eliminating the cross-conducting current that normally

happenswhenthecomparatorchangeslogicstates,power

supply glitches are eliminated.

The LTC1443/LTC1444/LTC1445 are available in the

16-pin SO, PDIP and DFN packages.

FeaTures

applicaTions

n

Ultralow Quiescent Current: 8.5µA Max

n

Reference Output Drives 0.01µF Capacitor

n

Adjustable Hysteresis (LTC1444/LTC1445)

n

Wide Supply Range

Single: 2V to 11V

Dual: ±1V to ±5.5V

n

Input Voltage Range Includes the Negative Supply

n

TTL/CMOS Compatible Outputs

n

Propagation Delay: 12µs (Typ) (10mV Overdrive)

n

No Crowbar Current

n

40mA Continuous Source Current

n

Pin Compatible Upgrades for MAX924 (LTC1443)

n

Low Profile (5mm

× 4mm × 0.8mm) DFN Package

n

Battery-Powered System Monitoring

n

Threshold Detectors

n

Window Comparators

n

Oscillator Circuits

Reference Settling Test Circuit

–

+

5

OUT

1.2V

R1

10k

R3

430

R2

2.4M

C1

1.0µF

HYST

REF

4

14

8

5V

TO 8V

144345 TA01

LTC1445

3

9

2

1.21M

1%

3.4M

1%

+–

Reference Settling

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

8V

5V

144345 TA02

OUT

2ms/DIV