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Part: MAX6458
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6457, MAX6458, MAX6459, MAX6460 High-Voltage, Low-current Voltage Monitors in Sot Packages
Company: Maxim Integrated Products
Datasheet: Download MAX6458 datasheet File size : 13806 kB
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Datasheet text preview:
19-2534; Rev 1; 6/03
High-Voltage, Low-Current Voltage Monitors in SOT Packages
General Description
The MAX6457MAX6460 high supply voltage, low-power voltage monitors operate over a 4V to 28V supply voltage range. Each device includes a precision bandgap reference, one or two low-offset voltage comparators, internal t h r e s h o l d 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 voltage window. The MAX6459 includes dual overvoltage/ undervoltage comparators with two independent comparator outputs. Use the MAX6459 as a window comparator with separate undervoltage and overvoltage outputs or as two independent, single voltage monitors. The MAX6460 includes a single comparator and an internal 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 activehigh 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 circuit with a 90ms minimum reset timeout delay. The monitored 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 noisesensitive applications. Each device is available in a small SOT23 package and specified over the extended temperature range of -40°C to +125°C. 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
Features
o Wide Supply Voltage Range, 4V to 28V
MAX6457MAX6460
Ordering Information
PART MAX6457UKD_ _-T MAX6458UKD_ _-T MAX6459UT_-T TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 5 SOT23-5 5 SOT23-5 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 hysteresis 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 CHARGER +21V (NOMINAL) IN OUT DC-DC CONVERTER SHDN VCC
Applications
Undervoltage Monitoring/Shutdown Overvoltage Monitoring/Protection Window Voltage Detection Circuitry Multicell Battery-Stack Powered Equipment Notebooks, eBooks Automotive Industrial Telecom Networking
R1 5-CELL Li+ BATTERY STACK IN+ R2 GND
MAX6457
OUT
RPULLUP
LOAD
CLEAR
________________________________________________________________ Maxim Integrated Products
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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.
High-Voltage, Low-Current Voltage Monitors in SOT Packages MAX6457MAX6460
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 SYMBOL VCC ICC (Note 2) VCC = 5V, no load VCC = 12V, no load VCC = 24V, no load V TH+ TA = -40°C to +85°C, VCC 4V VIN rising TA = +85°C to +125°C, VCC 4V MAX645_U_D_A Threshold Voltage V THTA = -40°C to +85°C TA = +85°C to +125°C 1.195 1.170 1.180 1.155 1.133 1.111 1.093 1.071 0.5 5 8.3 0 -55 50 VCC +55 V nA µs %VTH+ CONDITIONS MIN 4 2 3.5 6.5 1.228 TYP MAX 28 5 7.5 12.5 1.255 1.255 1.255 1.255 1.194 1.194 1.151 1.151 V µA UNITS V
TA = -40°C to +85°C VIN MAX645_U_D_B falling TA = +85°C to +125°C MAX645_U_D_C MAX64_ _U_D_A TA = -40°C to +85°C TA = +85°C to +125°C
Threshold Voltage Hysteresis IN Operating Voltage Range IN Leakage Current VIN IIN
MAX64_ _U_D_B MAX64_ _U_D_C (Note 2) VIN = 1.25V, VCC = +28V MAX645_UKD0_ MAX6459UT_ MAX6460UT MAX6457 and MAX6458 only, D3 option 90
OUT Timeout Period
tTP
150 2
210
ms ms
Startup Time CLEAR Input Logic Voltage (MAX6457) VIL VIH
VCC rising from GND to VCC 4V in less than 1µs (Note 3) 2
0.4
V
2
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High-Voltage, Low-Current Voltage Monitors in SOT Packages
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)
PARAMETER SYMBOL CONDITIONS VCC 1.5V, ISINK = 250µA, OUT asserted, TA = -40°C to +85°C VCC 4.0V, ISINK = 1mA, OUT asserted, TA = -40°C to +125°C VCC = 5V, VOUT = 28V (Note 4) OUT asserted, OUT = VCC REF = GND V REF TA = -40°C to +85°C TA = +85°C to +125°C Sourcing: 0 IREF 100µA, sinking: 0 |IREF| 300nA V OFFSET IBIAS I OFFSET CMVR CMRR PSRR VIN+ = VIN- = 1.4V 0 80 80 VIN+ = 1.4V, VIN- = 1V -4.5 6 -25 2 1.4 +25 2.183 2.171 10 7 2.25 2.25 50 +4.5 2.303 2.303 MIN TYP MAX 0.4 V 0.4 500 nA mA mA V µV/µA mV mV nA pA V dB dB UNITS
MAX6457MAX6460
Output Voltage Low
VOL
Output Leakage Current Output Short-Circuit Sink MAX6460 Reference Short-Circuit Current Reference Output Voltage Load Regulation Input Offset Voltage Input Hysteresis Input Bias Current Input Offset Current Common-Mode Voltage Range Common-Mode Rejection Ratio Comparator Power-Supply Rejection Ratio
ILKG ISC
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 VCC but cannot exceed +28V.
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