MIC841/842
Comparator with 1.25% Reference and
Adjustable Hysteresis
General Description
The MIC841 and MIC842 are micropower, 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 extremely 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
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
October 29, 2013
Revision 4.1
Micrel, Inc.
MIC841/842
Pin Configurations
MIC841
SC-70-5 (CS)
(Top View)
MIC841
6-Pin 1.6mm × 1.6mm TDFN (MT)
(Top View)
MIC842
SC-70-5 (CS)
(Top View)
MIC842
4-Pin 1.2mm × 1.6mm TDFN (MT)
(Top View)
MIC841 Pin Description
Pin Number
SC-70
1
2
3
Pin Number
TDFN
3
2
1
Pin Name
HTH
GND
LTH
OUT
4
6
OUT
OUT
5
−
−
4
5
EP
VDD
NC
ePad
Pin Function
High Threshold Input. HTH and LTH monitor external voltages.
Ground.
Low Threshold Input. LTH and HTH monitor external voltages.
(“H” Version) Active-Low Push-Pull Output. OUT asserts low when V
LTH
< V
REF
. OUT
remains low until V
HTH
> V
REF
.
(“L” Version) Active-High Push-Pull Output. OUT asserts high when V
LTH
< V
REF
. OUT
remains high until V
HTH
> V
REF
.
(“N” Version) Active-Low, Open-Drain Output. OUT asserts low when V
LTH
< V
REF
.
OUT remains low until V
HTH
> V
REF
.
Power Supply Input
No Connect. Not internally connected
Heatsink Pad. Connect to GND for best thermal performance.
MIC842 Pin Description
Pin Number
SC-70
1
2
3
Pin Number
TDFN
3
2
−
Pin Name
INP
GND
NC
OUT
4
1
OUT
OUT
5
−
4
EP
VDD
ePad
Pin Function
Threshold Input. INP monitors an external voltage.
Ground
No Connect. Not internally connected.
(“H” Version) Active-Low, Push-Pull Output. OUT asserts low when V
INP
< V
REF
. OUT
remains low until V
INP
> (V
REF
+ V
HYST
).
(“L” Version) Active-High, Push-Pull Output. OUT asserts high when V
INP
< V
REF
. OUT
remains high until V
INP
> (V
REF
+ V
HYST
).
(“N” Version) Active-Low, Open-Drain Output. OUT asserts low when V
INP
< V
REF
. OUT
remains low until V
INP
> (V
REF
+ V
HYST
).
Power Supply Input
Heatsink Pad. Connect to GND for best thermal performance.
October 29, 2013
3
Revision 4.1
Micrel, Inc.
MIC841/842
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) ....................................... –0.3V to +7V
Input Voltage (V
INP,
V
LTH,
V
LTL
) ....................................... +7V
Output Current (I
OUT
) ................................................. ±20mA
Storage Temperature (T
S
) ........................ –65°C to +150°C
Junction Temperature (T
J
) ...................................... +150°C
(3)
ESD Rating .................................................................. 1kV
Operating Ratings
(2)
Supply Voltage (V
DD
) ................................... +1.5V to +5.5V
Input Voltage (V
INP
V
LTH,
V
LTL
)................................ 0V to 6V
V
OUT
(‘H’ and ‘L’ versions)............................................... V
DD
V
OUT
(‘N’ version) ............................................................. 6V
Ambient Temperature Range (T
A
) ............. –40°C to +85°C
Package Thermal Resistance
SC-70-5 (θ
JA
) ............................................... 256.5°C/W
6-pin 1.6mm × 1.6mm TDFN ............................. 92°C/W
4-pin 1.2mm × 1.6mm TDFN ........................... 173°C/W
Electrical Characteristics
(4)
1.5V ≤ V
DD
≤ 5.5V; T
A
= +25°C,
bold
values indicate –40°C≤ T
A
≤ +85°C, unless noted.
Symbol
I
DD
I
INP
V
REF
V
HYST
t
D
Parameter
Supply Current
Input Leakage Current
Reference Voltage
Hysteresis Voltage
Propagation Delay
(5)
Condition
Output not asserted
Min.
Typ.
1.5
0.005
Max.
3
10
1.256
1.261
35
50
50
0.3
0.4
Units
µA
nA
V
mV
µs
0°C to 85°C
–40°C to 85°C
MIC842 only
V
INP
= 1.352V to 1.128V
V
INP
= 1.143V to 1.367V
I
SINK
= 1.6mA, V
DD
≥
1.6V
I
SINK
= 100µA, V
DD
≥
1.2V
I
SOURCE
= 500µA, V
DD
≥
1.6V
I
SOURCE
= 50µA, V
DD
≥
1.2V
1.225
1.219
8
1.240
1.240
20
12
8
0.05
0.005
0.99V
DD
0.99V
DD
Output Voltage-Low
V
OUT
(6)
V
Output Voltage-High
Notes:
V
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
5. V
HTH
= V
REF
+ V
HYST
.
6. V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be de-asserted down to V
DD
= 1.2V.
October 29, 2013
4
Revision 4.1
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