MAX6457UKD3C-T ,150 ms, high-voltage, low-current voltage monitor in SOT packageApplications+21V (NOMINAL)BATTERY IN DC-DC OUTUndervoltage Monitoring/ShutdownCHARGER CONVERTERSHDN ..
MAX6458UKD0A-T ,50 ms, high-voltage, low-current voltage monitor in SOT packageapplications or allows(50µs, 150ms)the device to operate in transparent mode. The MAX6458 Internal ..
MAX6458UKD0B+ ,High-Voltage, Low-Current Voltage Monitors in SOT PackagesELECTRICAL CHARACTERISTICS(V = 4V to 28V, T = -40°C to +125°C, unless otherwise specified. Typical ..
MAX6458UKD0B+T ,High-Voltage, Low-Current Voltage Monitors in SOT PackagesMAX6457–MAX646019-2534; Rev 1; 6/03High-Voltage, Low-Current Voltage Monitors inSOT Packages
MAX6458UKD3B ,High-Voltage, Low-Current Voltage Monitors in SOT PackagesApplications+21V (NOMINAL)BATTERY IN DC-DC OUTUndervoltage Monitoring/ShutdownCHARGER CONVERTERSHDN ..
MAX6459UTA+T ,High-Voltage, Low-Current Voltage Monitors in SOT PackagesELECTRICAL CHARACTERISTICS(V = 4V to 28V, T = -40°C to +125°C, unless otherwise specified. Typical ..
MB2S ,Bridge RectifiersMB1S - MB8SMB1S - MB8S43
MB3120 ,Compandor ICBLOCK DIAGRAM
COMPRESSOR
EXPANDOH
INPUT
COMMON
MUTE
COMPRESSOR',
SECTION
COMPRESS ..
MB3516A ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3516APF ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3614 ,QUAD OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11107-3EDATA SHEETLINEAR ICQUAD OPERATIONAL AMPLIFIERMB3614QUAD OPERATION ..
MB3614P ,Quad operational amplifierelectrical characteristics of current industrial standard operational am-DIP-14P-M02plifier and req ..
MAX6457UKD3C-T-MAX6458UKD0A-T
50 ms, high-voltage, low-current voltage monitor in SOT package
General DescriptionThe 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.
ApplicationsUndervoltage Monitoring/Shutdown
Overvoltage Monitoring/Protection
Window Voltage Detection Circuitry
Multicell Battery-Stack Powered Equipment
Notebooks, eBooks
Automotive
Industrial
Telecom
Networking
FeaturesWide Supply Voltage Range, 4V to 28VInternal 2.25V ±2.5% Reference Low Current (3.5µA, typ at 12V)Open-Drain N-Channel Output (28V Compliant)Internal Threshold Hysteresis Options
(0.5%, 5%, 8.3%)Two IN-to-OUT Timeout Period Options
(50µs, 150ms)Internal Undervoltage LockoutImmune to Short Voltage Transients Small SOT23 PackagesFew External ComponentsFully Specified from -40°C to +125°C
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
Ordering Informationypical Operating Circuit19-2534; Rev 1; 6/03
Pin Configurations appear at end of data sheet.
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.
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 4V to 28V, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
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, OUTA, OUTB, CLEARto 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
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
Note 1:Devices are production tested at +25°C. Overtemperature limits are guaranteed by design.
Note 2:IN voltage monitoring requires that VCC≥4V, but OUT remains asserted in the correct undervoltage lockout state for VCC
down to 1.5V.
Note 3:Startup time is the time required for the internal regulator and reference to reach specified accuracy after the monitor is
powered up from GND.
Note 4:The open-drain output can be pulled up to a voltage greater than VCCbut cannot exceed +28V.
ELECTRICAL CHARACTERISTICS (continued)(VCC= 4V to 28V, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
Typical Operating Characteristics(GND = 0, RPULLUP= 10kΩ, and TA= +25°C, unless otherwise noted.)
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
OUTPUT SHORT-CIRCUIT SINK CURRENT
vs. TEMPERATUREMAX6457-60 toc06
TEMPERATURE (°C)
ISC
(mA)
TIMEOUT PERIOD vs. TEMPERATURE
MAX6457-60 toc07
TEMPERATURE (°C)
(ms)
OUTPUT FALL TIME
vs. SUPPLY VOLTAGE
MAX6457-60 toc08
VCC (V)
OUTPUT FALL TIME (ns)2016128
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
MAX6457-60 toc09
INPUT OVERDRIVE (VTH- - VIN+) (mV)
MAXIMUM TRANSIENT DURATION (
MAX6457-60 toc10
TEMPERATURE (°C)
IIN
(nA)
INPUT LEAKAGE CURRENT
vs. TEMPERATURE
Typical Operating Characteristics (continued)
(GND = 0, RPULLUP= 10kΩ, and TA= +25°C, unless otherwise noted.)
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
Functional DiagramsFigure 1. MAX6457 Functional DiagramFigure 2. MAX6458 Functional Diagram
Figure 3. MAX6459 Functional DiagramFigure 4. MAX6460 Functional Diagram
MAX6457–MAX6460
Detailed DescriptionEach of the MAX6457–MAX6460 high-voltage (4V to
28V), low-power voltage monitors include a precision
bandgap reference, one or two low-offset-voltage com-
parators, internal threshold hysteresis, internal timeout
period, and one or two high-voltage open-drain outputs.
Programming the Trip Voltage (VTRIP)Two external resistors set the trip voltage, VTRIP(Figure 5).
VTRIPis the point at which the applied voltage (typically
VCC) toggles OUT. The MAX6457/MAX6458/MAX6459/
MAX6460’s high input impedance allows large-value
resistors without compromising trip-voltage accuracy.
To minimize current consumption, select a value for R2
between 10kΩand 1MΩ, then calculate R1 as follows:
where VTRIP= desired trip voltage (in volts), VTH=
threshold trip voltage (VTH+ for overvoltage detection
or VTH- for undervoltage detection).
Use the MAX6460 voltage reference (REF) to set the
trip threshold by connecting IN+ or IN- through a volt-
age divider (within the inputs common-mode voltage
range) to REF. Small leakage currents into the com-
parators inputs allows use of large value resistors to
prevent loading the reference and affecting its accura-
cy. Figure 5b shows an active-high power-good output.
Use the following equation to determine the resistor val-
ues when connecting REF to IN-:
where VREF= reference output voltage (2.25V, typ),
VREFD= divided reference, VTRIP= desired trip thresh-
old in (in volts).
For an active-low power-good output, connect the
resistor divider R1 and R2 to the inverting input and the
reference-divider network to the noninverting input.
Alternatively, connect an external reference less than
1.4V to either input.
High-Voltage, Low-Current Voltage Monitors in
SOT PackagesFigure 5a. Programming the Trip Voltage
Figure 5b. Programming the MAX6460 Trip Voltage
Figure 6. Input and Output Waveforms (Noninverting Input Varied)
