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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6460 Datasheet

High-Voltage / Low-Current Voltage Monitors in SOT Packages

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MAX6460 pdf
19-2534; Rev 1; 6/03
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
General Description
The MAX6457–MAX6460 high supply voltage, low-power
voltage monitors operate over a 4V to 28V supply voltage
range. Each device includes a precision bandgap refer-
ence, one or two low-offset voltage comparators, internal
threshold hysteresis, power good or reset timeout
options, and one or two high-voltage open-drain outputs.
Two external resistors (three for window detection) set the
trip threshold voltages.
The MAX6457 is a single voltage monitor for undervoltage
or overvoltage detection. A logic-based clear input either
latches the output for overvoltage applications or allows
the device to operate in transparent mode. The MAX6458
includes two comparators (one overvoltage and one
undervoltage) for window detection and a single output to
indicate if the monitored input is within an adjustable volt-
age window. The MAX6459 includes dual overvoltage/
undervoltage comparators with two independent com-
parator outputs. Use the MAX6459 as a window com-
parator with separate undervoltage and overvoltage
outputs or as two independent, single voltage monitors.
The MAX6460 includes a single comparator and an inter-
nal reference, and can also accept an external reference.
The inverting and noninverting inputs of the comparator
are externally accessible to support positive or negative
voltage monitors and to configure the device for active-
high or active-low output logic.
The MAX6457/MAX6458 offer fixed timing options as a
voltage detector with a 50µs typical delay or as a reset cir-
cuit with a 90ms minimum reset timeout delay. The moni-
tored input must be above the adjusted trip threshold (or
within the adjusted voltage window for the MAX6458) for
the selected timeout period before the output changes
state. The MAX6459/MAX6460 offer only a fixed 50µs
timeout period. Internal threshold hysteresis options (0.5%,
5%, and 8.3% for the MAX6457/MAX6458/MAX6459, and
0.5% for the MAX6460) reduce output chatter in noise-
sensitive applications. Each device is available in a small
SOT23 package and specified over the extended temper-
ature range of -40°C to +125°C.
Applications
Undervoltage Monitoring/Shutdown
Overvoltage Monitoring/Protection
Window Voltage Detection Circuitry
Multicell Battery-Stack Powered Equipment
Notebooks, eBooks
Automotive
Industrial
Telecom
Networking
Features
o Wide Supply Voltage Range, 4V to 28V
o Internal 2.25V ±2.5% Reference
o Low Current (3.5µA, typ at 12V)
o Open-Drain N-Channel Output (28V Compliant)
o Internal Threshold Hysteresis Options
(0.5%, 5%, 8.3%)
o Two IN-to-OUT Timeout Period Options
(50µs, 150ms)
o Internal Undervoltage Lockout
o Immune to Short Voltage Transients
o Small SOT23 Packages
o Few External Components
o Fully Specified from -40°C to +125°C
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6457UKD_ _-T -40°C to +125°C 5 SOT23-5
MAX6458UKD_ _-T -40°C to +125°C 5 SOT23-5
MAX6459UT_-T
-40°C to +125°C 6 SOT23-6
MAX6460UT-T
-40°C to +125°C 6 SOT23-6
Note: The MAX6457/MAX6458/MAX6459 are available with
factory-trimmed internal hysteresis options. The MAX6457 and
MAX6458 offer two fixed timing options. Select the desired hys-
teresis and timing options using Table 1 or the Selector Guide at
the end of the data sheet, and enter the corresponding letters
and numbers in the part number by replacing “_ _” or “_”. These
devices are offered in tape-and-reel only and must be ordered in
2500-piece increments.
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
BATTERY +21V (NOMINAL)
CHARGER
VCC
IN DC-DC OUT
CONVERTER
SHDN
5-CELL
Li+
BATTERY
STACK
MAX6457
R1 RPULLUP
IN+ OUT
R2
GND
CLEAR
LOAD
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6460 Datasheet

High-Voltage / Low-Current Voltage Monitors in SOT Packages

No Preview Available !

MAX6460 pdf
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
ABSOLUTE MAXIMUM RATINGS
VCC, OUT, OUTA, OUTB, CLEAR to GND ..........-0.3V to +30.0V
IN+, IN- to GND..........................................-0.3V to (VCC + 0.3V)
REF to GND..............-0.3V to the lower of +6V and (VCC + 0.3V)
Input Currents (VCC, IN+, IN-) ............................................20mA
Sink Current (OUT, OUTA, OUTB) ......................................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1 mW/°C above +70°C)............571mW
6-Pin SOT23 (derate 8.7 mW/°C above +70°C)............696mW
Junction Temperature ......................................................+150°C
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(VCC = 4V to 28V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current
Threshold Voltage
Threshold Voltage Hysteresis
IN Operating Voltage Range
IN Leakage Current
OUT Timeout Period
SYMBOL
CONDITIONS
VCC (Note 2)
VCC = 5V, no load
ICC VCC = 12V, no load
VTH+
VCC = 24V, no load
VIN TA = -40°C to +85°C, VCC 4V
rising TA = +85°C to +125°C, VCC 4V
MAX645_U_D_A TA = -40°C to +85°C
TA = +85°C to +125°C
VTH-
VIN
falling
MAX645_U_D_B
TA = -40°C to +85°C
TA = +85°C to +125°C
MAX645_U_D_C TA = -40°C to +85°C
TA = +85°C to +125°C
MAX64_ _U_D_A
MAX64_ _U_D_B
MAX64_ _U_D_C
VIN (Note 2)
IIN VIN = 1.25V, VCC = +28V
MAX645_UKD0_
MAX6459UT_
tTP MAX6460UT
MAX6457 and MAX6458 only,
D3 option
MIN
4
1.195
1.170
1.180
1.155
1.133
1.111
1.093
1.071
0
-55
90
TYP
2
3.5
6.5
1.228
0.5
5
8.3
50
150
Startup Time
VCC rising from GND to VCC 4V in less than
1µs (Note 3)
2
CLEAR Input Logic Voltage
(MAX6457)
VIL
VIH
2
MAX
28
5
7.5
12.5
1.255
1.255
1.255
1.255
1.194
1.194
1.151
1.151
VCC
+55
210
0.4
UNITS
V
µA
V
%VTH+
V
nA
µs
ms
ms
V
2 _______________________________________________________________________________________


Part Number MAX6460
Description High-Voltage / Low-Current Voltage Monitors in SOT Packages
Maker Maxim
Total Page 15 Pages
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