LTC1445| Datasheet

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LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference

FEATURES

DESCRIPTIO

Ultralow Quiescent Current: 8.5uA Max Reference Output Drives 0.01uF Capacitor Adjustable Hysteresis (LTC1444/LTC1445) Wide Supply Range Single: 2V to 11V Dual: 1V to 5.5V Input Voltage Range Includes the Negative Supply TTL/CMOS Compatible Outputs Propagation Delay: 12us (Typ) (10mV Overdrive) No Crowbar Current 40mA Continuous Source Current Pin Compatible Upgrades for MAX924 (LTC1443) Low Profile (5mm 4mm 0.8mm) DFN Package

The LTC 1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5uA 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 0.01uF 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 happens when the comparator changes logic states, power supply glitches are eliminated. The LTC1443/LTC1444/LTC1
445 are available in the 16-pin SO, PDIP and DFN packages.

APPLICATIO S

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, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO
VIN 3.4M 1% 5V TO 8V

Reference Settling Test Circuit
3 V+ 5 IN A+ V+ 5V 2 4 IN A

8V

2mV/DIV

+
OUT

VREF

LTC1445 V 9 OUT 2ms/DIV
LTC1443/1444/1445 TA02

14 HYST 1.21M 1% R1 10k R2 2.4M 8 REF R3 430 C1 1.0uF

LTC1443/44/45 TA01

U
Reference Settling
144345fc

U

U

1

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LTC1445 DATASHEET