MIC833
Comparator and Reference with Adjustable Hysteresis
Features
General Description
• Optimized for Handheld Electronics, Cellular
Telephones, and Other Battery-Powered Devices
• Inputs and Output Can Pull-Up to 6V Regardless
of Supply Voltage
• Independently Adjustable High- and Low-Voltage
Thresholds
• High ±1.5% Voltage Threshold Accuracy
• Extremely Low 1 μA Typical Supply Current
• Immune to Brief Input Transients
• 5-Lead SOT-23 Package
The MIC833 is a micropower precision dual-voltage
comparator with an on-chip reference and latch.
High-voltage and low-voltage thresholds are adjusted
independently, allowing for wide hysteresis. Three
external resistors determine the threshold voltages.
Voltage detection thresholds are accurate to 1.5%.
Supply current is extremely low (1 μA, typical), making
it ideal for portable applications.
Applications
•
•
•
•
•
Handheld Electronics
Mobile Phones
Consumer Electronics
Embedded Controllers
Personal Electronics
The MIC833 is supplied in a 5-lead SOT-23 package.
See the MIC2778 for applications that require an output
delay.
Package Type
MIC833
SOT-23-5 (M5)
(Top View)
LTH GND HTH
3
2020 Microchip Technology Inc.
2
1
4
5
OUT
VDD
DS20006336A-page 1
MIC833
Typical Application Circuit
VIN VDD
VPULL-UP
MIC833
5
R1
3
1
R2
VDD
OUT
4
RPU
VOUT
LTH
HTH
GND
VLTH > VHTH
VREF = 1.24V
VLTH(max) = VHTH(max) = 6V
VPULL-UP(max) = 6V
1.5V ≤ VDD ≤ 5.5V
2
R3
Functional Diagram
VHI
VIN
V
(Note B) LO
Note A
Note A
VPULL-UP
VOUT
0V
Note:
A) Brief transients are ignored by the MIC833. See the Application Information section.
Note:
B) VLTH > VLO > VREF.
Timing Diagram
VLTH
VREF + 100mV
Inputs
VREF
VREF – 100mV
tD
VHTH
tD
VPULL-UP
VOUT
0V
DS20006336A-page 2
2020 Microchip Technology Inc.
MIC833
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VDD) ................................................................................................................................... –0.3V to +7V
Input Voltages (VLTH, VHTH). ...................................................................................................................................... +7V
Output Current (IOUT) ..............................................................................................................................................20 mA
Output Voltage (VOUT) ................................................................................................................................. –0.3V to +7V
ESD Rating (Note 1) ..................................................................................................................................................2 kV
Operating Ratings ††
Supply Voltage (VDD) ................................................................................................................................ +1.5V to +5.5V
Input Voltage (VLTH, VHTH) ............................................................................................................................... 0V to +6V
Output Voltage (VOUT) ...................................................................................................................................... 0V to +6V
† Notice: Exceeding the absolute maximum rating may damage the device.
†† Notice: The device is not guaranteed to function outside its operating rating.
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with
100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: 1.5V ≤ VDD ≤ 5.5V; TA = +25°C, unless noted.
Parameters
Sym.
Min.
Typ.
Max.
Units
IDD
—
1
2
μA
Outputs not asserted,
–40°C ≤ TA ≤ +85°C
ILTH, IHTH
—
0.005
10
nA
–40°C ≤ TA ≤ +85°C
Reference Voltage
VREF
1.221
1.240
1.259
V
–40°C ≤ TA ≤ +85°C
Propagation Delay
tD
—
5
—
—
5
—
—
—
0.3
Supply Current
Input Leakage Current
Output Voltage-Low
(Note 1)
Note 1:
μs
V
VOUT
—
—
0.4
Conditions
VLTH = 1.352V to 1.128V
VHTH = 1.128V to 1.352V
OUT de-asserted, ISINK = 1.6 mA,
VDD ≥1.6V, –40°C ≤ TA ≤ +85°C
OUT de-asserted, ISINK = 100 μA,
VDD ≥1.2V, –40°C ≤ TA ≤ +85°C
VDD operating range is 1.5V to 5.5V. Output is guaranteed to be held low down to VDD = 1.2V.
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Lead Temperature
—
—
—
+260
°C
Soldering, 10s
Storage Temperature Range
TS
–65
—
+150
°C
—
Ambient Temperature
TA
–40
—
+85
°C
—
JA
—
260
—
°C/W
—
Temperature Ranges
Package Thermal Resistances
Thermal Resistance, SOT-23-5Ld
2020 Microchip Technology Inc.
DS20006336A-page 3
MIC833
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Symbol
Description
1
HTH
High-Voltage Threshold (Input): Analog input to a comparator. This is the voltage
input assigned to detect a high-voltage condition when the level on this pin exceeds
VREF, OUT is asserted and the condition is latched until VLTH < VREF.
2
GND
Ground
3
LTH
Low-Voltage Threshold (Input): Analog input to a comparator. This is the voltage
input assigned to detect a low voltage condition. When the level on this pin falls
below VREF, OUT is de-asserted and the condition is latched until VHTH > VREF.
4
OUT
Output: Active-high, open-drain output. This output is de-asserted and latched when
VLTH VREF.
5
VDD
Power Supply (Input): Independent supply input for internal circuitry.
DS20006336A-page 4
2020 Microchip Technology Inc.
MIC833
3.0
FUNCTIONAL DESCRIPTION
The MIC833 monitors a voltage and detects when it is
below or above two independently programmed levels.
VDD
+1.5V TO +5.5V
5
VIN
VLTH
VDD
LOW-VOLTAGE DETECT
LTH
3
HIGH-VOLTAGE DETECT
VHTH
HTH
R
Q
S
Q
OUT
4
1
1.24V
BANDGAP
REFERENCE
MIC833
2 GND
FIGURE 3-1:
3.1
MIC833 Block Diagram.
Voltage Low Output
The output (OUT) is an active-high, open-drain output
that sinks current when the MIC833 detects a low input
voltage at its LTH input. This condition is latched until
the HTH input is presented with a voltage higher than
the internal VREF (+1.24V).
3.2
Trip Points
Input voltage is monitored by the comparators via a
voltage divider network. The divided voltage is
compared to an internal reference voltage. When the
voltage at the LTH input pin drops below the internal
reference voltage, the output pulls low. Because of the
voltage divider, the voltage at HTH is assured to be
below the reference voltage.
2020 Microchip Technology Inc.
DS20006336A-page 5
MIC833
4.0
APPLICATION INFORMATION
VIN
4.1
Output
Because the MIC833 output is an open-drain MOSFET,
most applications will require a pull-up resistor. The
value of the resistor should not be too large or leakage
effects may dominate. 470 kΩ is the maximum
recommended value. Note that the output may be
pulled up as high as 6V regardless of IC supply voltage.
See the Electrical Characteristics section for details.
4.2
VDD
R1
Nȍ
1%
MIC833
5
3
R2
Nȍ
R3
Nȍ
1
1%
VDD
OUT
LTH
HTH
GND
4
Nȍ
VOUT
2
1%
Programming the Thresholds
The low-voltage
Equation 4-1.
threshold
is
calculated
by
For example, use a total of 1 MΩ = R1 + R2 + R3. For
a typical single-cell lithium ion battery, 3.6V is a good
high threshold because at 3.6V the battery is
moderately charged. Solving for R3:
R1 + R2 + R3V IN LO = V REF --------------------------------R2 + R3
Where:
=
The high-voltage
Equation 4-2.
EQUATION 4-3:
1.240V
threshold
is
calculated
by
1M
V IN HI = 3.6V = 1.24V -------------
R3
Where:
EQUATION 4-2:
R3
R1 + R2 + R3
V IN HI = V REF ---------------------------------R3
Where:
VREF
Example Circuit.
Once the desired trip points are determined, set the
VIN(HI) threshold first.
EQUATION 4-1:
VREF
FIGURE 4-1:
=
1.240V
In order to provide the additional criteria needed to
solve for the resistor values, the resistors can be
selected such that they have a given total value of
R1 + R2 + R3 = RTOTAL. A value such as 1 MΩ for
RTOTAL is a reasonable value because it draws
minimum current but has no significant effect on
accuracy.
When working with large resistors, a small amount of
leakage current can cause voltage offsets that degrade
system accuracy. The maximum recommended total
resistance from VIN to ground is 3 MΩ.
=
344 kΩ
Once R3 is determined, the equation for VIN(LO) can be
used to determine R2. A single lithium-ion cell, for
example, should not be discharged below 2.5V. Many
applications limit the drain to 3.1V. Using 3.1V for the
VIN(LO) threshold allows calculation of the two
remaining resistor values.
EQUATION 4-4:
1M
V IN LO = 3.1V = 1.24V ------------------------------
R2 + 344k
Where:
R2
=
56 kΩ
1 MΩ–(R2–R3)
=
R1
R1
=
600 kΩ
The accuracy of the resistors can be chosen based
upon the accuracy required by the system.
The inputs may be subjected to voltages as high as 6V
steady state without adverse effects of any kind,
regardless of the IC supply voltage. This applies even
if the supply voltage is zero. This permits the situation
in which the IC supply is turned off, but voltage is still
present on the inputs. See Electrical Characteristics.
DS20006336A-page 6
2020 Microchip Technology Inc.
MIC833
4.3
Input Transients
is between the two thresholds, the output of the part will
be high because input HTH will have been higher than
the 1.24V reference during initialization.
The MIC833 is inherently immune to very short
negative going glitches. Very brief transients may
exceed the VIN(LO) threshold without tripping the
output.
It is not very likely the part would be powered up in this
state. It is more likely the same power supply will power
the part and develop its inputs. However, if the
above-described condition should occur, the next HTH
threshold crossing would not be processed because
the latch would have been already set. The next valid
input condition would have to be a crossing of the LTH
threshold, which resets the latch, after which “normal”
operation is restored.
MAX. TRANSIENT DURATION (μs)
As shown in Figure 4-2, the narrower the transient, the
deeper the threshold overdrive that will be ignored by
the MIC833. The graph represents the typical allowable
transient duration for a given amount of threshold
overdrive that will not toggle the output.
140
4.5
120
The battery charger of Figure 4-3 uses the MIC833 to
detect a low-battery voltage condition (VDIS) and
enables a constant-current source (ICHG). Charging
current is enabled until a charged-battery voltage
condition (VCHG) is detected; at which time the
charging-current source is disabled.
100
80
60
Diode D1 was added to Figure 4-3 to ensure the
disabled current source does not draw battery current.
Whether or not D1 is required is a function of the output
stage of the current source and how it is disabled.
40
20
0
1
10
100
The circuitry of Figure 4-3 is deliberately generalized to
imply flexibility of application. Depending on the
application, it may not be possibly to power the MIC833
from the charger supply voltage, see Note 2 in
Figure 4-3. It may be necessary to provide a separate
voltage regulator, or a resistive voltage divider to
reduce the VDD applied to the MIC833. The part can be
supplied by the battery voltage (VBAT) if this voltage is
never lower than 1.5V, the minimum operating VDD of
the part.
1000
RESET COMP. OVERDRIVE, VREF–VLTH (mV)
FIGURE 4-2:
4.4
Example Application
Input Transient Response.
Initialization Behavior
When the MIC833 is powered up, the comparators and
latch become active before the reference voltage
reaches its final value. In most applications, this
presents no problems. However, the user should be
aware of applying power to the part; if the input voltage
CHARGER
SUPPLY
VOLTAGE
Voltage thresholds, VDIS and VCHG, are programmed
as described in the appropriate above paragraph.
CONSTANT-CURRENT
SOURCE
NOTE 1
OUT
IN
D1
EN
GND
NOTE 2
R4
Nȍ
VBATT
(NO LOAD)
MIC833
VDIS
BATTERY
VDD
HTH
R2
OUT
0.1F
LTH
GND
VCHRG
R3
NOTE 1. D1 MAY NOT BE REQUIRED. IT IS SHOWN
HERE TO INDICATE THE DISABLED CURRENT
SOURCE SHOULD NOT LOAD THE BATTERY.
NOTE 2. VDD OF THE MIC833 IS LIMITED TO 5.5V
MAXIMUM. THE PART CAN BE POWERED BY
VBATT IF THE BATTERY IS NEVER DISCHARGED
BELOW VDD(MIN) = 1.5V.
FIGURE 4-3:
Battery Charger.
2020 Microchip Technology Inc.
DS20006336A-page 7
MIC833
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
5-Lead SOT-23*
(Front)
XXX
e3
*
B11
5-Lead SOT-23*
Example
NNN
460
(Back)
Legend: XX...X
Y
YY
WW
NNN
Example
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
DS20006336A-page 8
2020 Microchip Technology Inc.
MIC833
5-Lead SOT-23 Package Outline & Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2020 Microchip Technology Inc.
DS20006336A-page 9
MIC833
NOTES:
DS20006336A-page 10
2020 Microchip Technology Inc.
MIC833
APPENDIX A:
REVISION HISTORY
Revision A (April 2020)
• Converted Micrel document MIC833 to Microchip
data sheet template DS20006336A.
• Minor grammatical text changes throughout.
2020 Microchip Technology Inc.
DS20006336A-page 11
MIC833
NOTES:
DS20006336A-page 12
2020 Microchip Technology Inc.
MIC833
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
PART NO.
X
XX
-XX
Device
Temperature
Range
Package
Media
Type
Device:
MIC833:
Comparator and Reference with Adjustable
Hysteresis
Temperature
Range:
Y
=
–40C to +85C (RoHS Compliant)
Packages:
M5
=
5-Lead SOT-23
Media Type:
TR
=
3,000/Reel
2020 Microchip Technology Inc.
Examples:
a)
MIC833YM5-TR:
Note 1:
Comparator and Reference with Adjustable
Hysteresis, –40°C to
+85°C (RoHS Compliant),
5LD SOT-23, 3,000/Reel.
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006336A-page 13
MIC833
NOTES:
DS20006336A-page 14
2020 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
Trademarks
The Microchip name and logo, the Microchip logo, Adaptec,
AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, chipKIT,
chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex,
flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck,
LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi,
Microsemi logo, MOST, MOST logo, MPLAB, OptoLyzer,
PackeTime, PIC, picoPower, PICSTART, PIC32 logo, PolarFire,
Prochip Designer, QTouch, SAM-BA, SenGenuity, SpyNIC, SST,
SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon,
TempTrackr, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA
are registered trademarks of Microchip Technology Incorporated in
the U.S.A. and other countries.
APT, ClockWorks, The Embedded Control Solutions Company,
EtherSynch, FlashTec, Hyper Speed Control, HyperLight Load,
IntelliMOS, Libero, motorBench, mTouch, Powermite 3, Precision
Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet-Wire,
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TimePictra, TimeProvider, Vite, WinPath, and ZL are registered
trademarks of Microchip Technology Incorporated in the U.S.A.
Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any
Capacitor, AnyIn, AnyOut, BlueSky, BodyCom, CodeGuard,
CryptoAuthentication, CryptoAutomotive, CryptoCompanion,
CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average
Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial
Programming, ICSP, INICnet, Inter-Chip Connectivity, JitterBlocker,
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MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach,
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ZENA are trademarks of Microchip Technology Incorporated in the
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SQTP is a service mark of Microchip Technology Incorporated in
the U.S.A.
The Adaptec logo, Frequency on Demand, Silicon Storage
Technology, and Symmcom are registered trademarks of Microchip
Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany
II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2020, Microchip Technology Incorporated, All Rights Reserved.
For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.
2020 Microchip Technology Inc.
ISBN: 978-1-5224-5916-3
DS20006336A-page 15
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DS20006336A-page 16
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02/28/20
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