MIC841/842

Comparator with 1.25% Reference and

Adjustable Hysteresis

Teeny is a trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

July 24, 2015

Revision 5.0

General Description

The MIC841 and MIC842 are micro-power, precision-

voltage comparators with an on-chip voltage reference.

Both

devices

are

intended

for

voltage

monitoring

applications. External resistors are used to set the voltage

monitor

threshold.

When

the

threshold

is

crossed,

the outputs switch polarity.

The

MIC842

incorporates

a

voltage

reference

and

comparator with fixed internal hysteresis; two external

resistors are used to set the switching threshold voltage.

The MIC841

provides

a similar function

with

user

adjustable hysteresis; this part requires three external

resistors

to

set

the

upper

and

lower

thresholds

(the difference between the threshold voltages being the

hysteresis voltage).

Both the MIC841 and MIC842 are available with push-pull

or open-drain output stage. The push-pull output stage is

configured either active high or active low; the open-drain

output stage is only configured active low.

Supply current is extremel

y low (1.5μA, typical), making it

ideal for portable applications.

The MIC841/2 is supplied in Micrel’s Teeny™ 5-pin

SC-70, 6-pin 1.6mm × 1.6mm Thin DFN (MIC841), and 4-

pin 1.2mm × 1.6mm Thin DFN (MIC842) packages.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• 1.5V to 5.5V operating range

•

1.5μA typical supply current

• ±1.25% voltage threshold accuracy

• 10nA maximum input leakage current overtemperature

• 10µs propagation delay

• Externally adjustable hysteresis (MIC841)

• Internal 20mV hysteresis (MIC842)

• Output options

− Push-pull, active high

− Push-pull, active low

− Open drain, active low

• Open drain output can be pulled to 6V regardless of V

DD

• Immune to brief input transients

• Teeny 5-pin SC-70 package

• 6-pin 1.6mm × 1.6mm TDFN (MIC841)

• 4-pin 1.2mm × 1.6mm TDFN (MIC842)

Applications

• Smart phones

• PDAs

• Precision battery monitoring

• Battery chargers

Typical Application

Threshold Detection with Adjustable Hysteresis

Threshold Detector with Internal Fixed Hysteresis