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MAX836EUS-T-MAX837EUS-T
4-Pin Micropower Voltage Monitors
_______________General Description
The MAX836/MAX837 micropower voltage monitors
contain a 1.204V precision bandgap reference and a
comparator in a SOT143 package. The MAX836 has an
open-drain, N-channel output driver, while the MAX837
has a push-pull output driver. Two external resistors set
the trip threshold voltage.
________________________Applications
Precision Battery Monitor
Load Switching
Battery-Powered Systems
Threshold Detectors
____________________________Features±1.25% Precision Voltage ThresholdSOT143 PackageLow Cost<5µA Typical Supply CurrentOpen-Drain Output (MAX836)
Push-Pull Output (MAX837)
MAX836/MAX837
4-Pin Micropower Voltage Monitors
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit
19-1137; Rev 0; 9/96
& the latest literature: http://,
MAX836/MAX837
4-Pin Micropower Voltage Monitors_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +2.5V to +11.0V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC, OUT to GND (MAX836)....................................-0.3V to 12V
IN, OUT to GND (MAX837).........................-0.3V to (VCC+ 0.3V)
Input Current
VCC.................................................................................20mA
IN.....................................................................................10mA
Output Current, OUT...........................................................20mA
Rate of Rise, VCC............................................................100V/µs
Continuous Power Dissipation
SOT143 (derate 4mW/°C above +70°C)......................320mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:The voltage-detector output remains in the direct state for VCCdown to 1.2V when VIN≤VCC/ 2.
Note 2:Supply current has a monotonic dependence on VCC(see Typical Operating Characteristics).
Note 3:IN leakage current has a monotonic dependence on VCC(see Typical Operating Characteristics).
Note 4:The MAX836 open-drain output can be pulled up to a voltage greater than VCC, but may not exceed 11V.
MAX836/MAX837
4-Pin Micropower Voltage Monitors
_______________________________________________________________________________________3
TRIP THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX836/7 01
TEMPERATURE (°C)
TRIP THRESHOLD VOLTAGE (V)0-20-40-60100806040
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX836/7 02
VCC (V)
SUPPLY CURRENT (
SUPPLY CURRENT vs. IN VOLTAGE
MAX836/7 03
VIN (V)
SUPPLY CURRENT (137591011126
IN LEAKAGE CURRENT vs. IN VOLTAGE
MAX836/7 04
VIN (V)
IN LEAKAGE CURRENT (nA)137591011
10,000
OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT
MAX836/7-06B
OUTPUT SINK CURRENT (mA)
OUTPUT VOLTAGE (mV)
IN LEAKAGE CURRENT vs.
SUPPLY VOLTAGE
MAX836/7 05
VCC (V)
IN LEAKAGE CURRENT (nA)
MAX837 OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX836/7-06A
OUTPUT SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE
vs. SUPPLY VOLTAGE
MAX836/7 07
VCC (V)
OUTPUT LOW VOLTAGE (mV)35971011128
SHORT-CIRCUIT SINK CURRENT vs.
SUPPLY VOLTAGE
MAX836/7 08
VCC (V)
SHORT-CIRCUIT SINK CURRENT (mA)
__________________________________________Typical Operating Characteristics
(VCC= +5V, RLOAD= 1MΩ, RPULL-UP= 10kΩ(MAX836 only), TA = +25°C, unless otherwise noted.)
_______________Detailed Description
The MAX836/MAX837 micropower voltage monitors
contain a 1.204V precision bandgap reference and a
comparator (see the Typical Operating Circuit). The
only difference between the two parts is the structure of
the comparator output driver. The MAX836 has an
open-drain N-channel output driver that can be pulled
up to a voltage higher than VCC, but under 11V. The
MAX837’s output is push-pull, and can both source
and sink current.
Programming the Trip Voltage
Two external resistors set the trip voltage, VTRIP (Figure 1).
VTRIPis the point at which the applied voltage (typically
VCC) toggles OUT. The MAX836/MAX837’s high input
impedance allows large-value resistors without compro-
mising trip-voltage accuracy. To minimize current con-
sumption, select a value for R2 between 500kWand
1MW, then calculate R1 as follows:
where VTRIP= desired trip voltage (in volts), VTH=
threshold trip voltage (1.204V).
__________Applications Information
Adding Hysteresis
Hysteresis adds noise immunity to the MAX836/MAX837
and prevents repeated triggering when VINis near the
threshold trip voltage. Figure 2 shows how to add hys-
teresis to the comparator. The technique is similar for
MAX836/MAX837
4-Pin Micropower Voltage Monitors_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(VCC= +5V, RLOAD= 1MΩ, RPULL-UP= 10kΩ(MAX836 only), TA = +25°C, unless otherwise noted.)
OUT RISE/FALL TIME vs.
SUPPLY VOLTAGE
MAX836/7 10
VCC (V)
TIME (ns)
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX836/7 09
TEMPERATURE (°C)
PROPAGATION DELAY (-4008040100
both parts. For the MAX836, select the ratio of resistors
R1 and R2 so that IN sees 1.204V when the monitor
voltage falls to or rises above the desired trip point
(VTRIP). R3 adds hysteresis and is typically an order of
magnitude larger than R1 or R2. The current through R1
and R2 should be at least 500nA to ensure that the
12nA maximum input current does not shift the trip
point significantly. Capacitor C1 adds additional noise
rejection.
Monitoring Voltages Other than VCC
The MAX836/MAX837 can monitor voltages other than
VCC(Figure 3). Calculate VTRIPas shown in the section
Programming the Trip Voltage. The monitored voltage
(VMON) is independent of VCC. VINmust be 1V less
than VCC.
Heater Temperature Control
Figure 4 shows a basic heater temperature-control cir-
cuit. Upon power-up, OUT is high and the N-channel
MOSFET turns on. Current flows through the heating
element (R4), warming the surrounding area. R2 is a
negative-temperature-coefficient thermistor and as tem-
perature increases, its resistance decreases. As the
thermistor heats up and its resistance decreases, the
MAX837’s voltage at IN decreases until it reaches the
1.204V threshold voltage. At this point, OUT goes low,
turning off the heating element. The thermistor cools
and the voltage at IN rises until it overcomes the
MAX837’s hysteresis (6mV). OUT returns high when this
point is reached, turning on the heating element again.
This cycle repeats as long as power is applied.
Determine the thermistor’s resistance (R2) at the
desired temperature. Then, using R2’s resistance and
half the resistance of R3, calculate R1’s value with the
following formula:
___________________Chip Information
TRANSISTOR COUNT:54
MAX836/MAX837
4-Pin Micropower Voltage Monitors5
Figure 4. Heater Temperature Control
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-76001996 Maxim Integrated Products Printed USAis a registered trademark of Maxim Integrated Products.
MAX836/MAX837
4-Pin Micropower Voltage Monitors
__________________________________________________Tape-and-Reel Information

Partno	Mfg	Dc	Qty	Available	Descript
MAX836EUS-T \|MAX836EUST	MAX	N/a	20	avai	4-Pin Micropower Voltage Monitors
MAX836EUS-T \|MAX836EUST	MAXIM	N/a	32500	avai	4-Pin Micropower Voltage Monitors
MAX837EUS-T \|MAX837EUST	MAXIM	N/a	2500	avai	4-Pin Micropower Voltage Monitors