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PDF MAX6460UT-T Data sheet ( Hoja de datos )
| Número de pieza | MAX6460UT-T | |
| Descripción | High-Voltage / Low-Current Voltage Monitors in SOT Packages | |
| Fabricantes | Maxim Integrated | |
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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.
1 page  
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
Typical Operating Characteristics (continued)
(GND = 0, RPULLUP = 10kΩ, and TA = +25°C, unless otherwise noted.)
OUTPUT SHORT-CIRCUIT SINK CURRENT
vs. TEMPERATURE
15
14 VCC = 12V
13
12
VCC = 5V
11
10 VCC = 24V
9
8
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TIMEOUT PERIOD vs. TEMPERATURE
1000
100
MAX6457UKD3
10
1
MAX6457UKD0
0.1
0.01
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
2000
1800
1600
1400
1200
1000
800
600
400
200
0
4
OUTPUT FALL TIME
vs. SUPPLY VOLTAGE
TA = +125°C
TA = +25°C
TA = -40°C
8 12 16 20 24 28
VCC (V)
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
300
250
200
150
100 OUT ASSERTED LOW
ABOVE THIS LINE
50
0
1 10 100 1000
INPUT OVERDRIVE (VTH- - VIN+) (mV)
INPUT LEAKAGE CURRENT
vs. TEMPERATURE
10
VIN = 1.25V
8
6
4
2
0
-2
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
remains high. When VCC exceeds VTRIPHIGH, OUTB
asserts low while OUTA remains high. VTRIPLOW and
VTRIPHIGH are given by the following equations:
VTRIPLOW
=
VTH-
RTOTAL
R2 + R3
VTRIPHIGH
=
VTH+
RTOTAL
R3
where RTOTAL = R1 + R2 + R3.
Use the following steps to determine the values for R1,
R2, and R3.
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX6458/MAX6459 have very
high input impedance, RTOTAL can be up to 5MΩ.
2) Calculate R3 based on RTOTAL and the desired
upper trip point:
R3 = VTH+ × RTOTAL
VTRIPHIGH
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
R2 = VTH- × RTOTAL - R3
VTRIPLOW
4) Calculate R1 based on RTOTAL, R3, and R2:
R1 = RTOTAL - R2 - R3
Example Calculations for Window
Detection
The following is an example for calculating R1, R2, and
R3 of Figure 11 for window detection. Select the upper
and lower trip points (VTRIPHIGH and VTRIPLOW).
VCC = 21V
VTRIPHIGH = 23.1V
VTRIPLOW = 18.9V
For 5% hysteresis, VTH+ = 1.228 and VTH- = 1.167.
1) Choose RTOTAL = 4.2MΩ = R1 + R2 + R3
2) Calculate R3
R3 = VTH+ × RTOTAL = (1.228V) (4.2MΩ)
VTRIPHIGH
23.1V
= 223.273kΩ
3) Calculate R2
VCC (4V TO 28V)
VCC
MAX6457–
MAX6460
VOUT (UP TO 28V)
OUT/
OUTA/
OUTB
RPULLUP
OUT/
OUTA/
OUTB
GND
Figure 13. Interfacing to Voltages Other than VCC
VMON
R1
R2
VCC
VCC
MAX6457–
MAX6460
IN+ OUT
(OUTB FOR
MAX6459)
RPULLUP
OUT
(OUTB)
GND
VCC
VCC
IN-
MAX6460
REF
OUT
RPULLUP
OUT
R1
IN+
GND
R2
VNEG
Figure 12. Monitoring Voltages Other than VCC
Figure 14. Monitoring Negative Voltages
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX6460UT-T.PDF ] | |
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