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Part: MAX1808
Category:
Power Management
-> Battery Management
Description: Micropower Adjustable Overvoltage Protection Controllers
Company: Maxim Integrated Products
Datasheet: Download MAX1808 datasheet File size : 750 kB
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Datasheet text preview:
19-1791; Rev 0; 10/00
Micropower Adjustable Overvoltage Protection Controllers
General Description
The MAX1807/MAX1808 monitor up to five supply rails for an overvoltage condition and provide a latched output when any one of the five supplies exceeds the trip thresholds. The latched output drives an external Pchannel load switch to remove power when an overvoltage condition is detected. The latch is reset when a logic low is input to ON or the power supply is cycled. The MAX1807 provides a 28V open-drain fault output that can be used to trigger an alert, trip a resetable fuse, or for other purposes. The MAX1808 includes a low-battery comparator with hysteresis to drive the DP output high, turning off the external P-channel switch when the input voltage is too low. The MAX1807/MAX1808 are available in a miniature 10pin µMAX package.
Features
o Five 3% Accurate Overvoltage Comparators o Series PFET Gate Driver with VGS Limiter o 21µA Quiescent Supply Current o 4µA Shutdown Current o 4.4V to 28V Operating Voltage Range o 3% Accurate Comparator with 10% Hysteresis for Low-Battery Detection (MAX1808) o 28V Open-Drain N-Channel Output (MAX1807) o Small 10-Pin µMAX Package
MAX1807/MAX1808
________________________Applications
Notebook Computers Power-Supply Modules Multi-Output Power Supplies
PART MAX1807EUB MAX1808EUB
Ordering Information
TEMP. RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 10 µMAX 10 µMAX
Pin Configuration and Typical Operating Circuit appear at end of data sheet.
Functional Diagram
VDD ON 1V REF TH (MAX1808) + _ + _ + _ + _ + _ + _ 2.5V INTERNAL SUPPLY REF OK POWER-ON RESET (60µs)
PMOS POWER DRIVER
DP
IN1 IN2 IN3 IN4 IN5
R S
Q FAULT (MAX1807)
MAX1807 MAX1808
GND
________________________________________________________________ Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Micropower Adjustable Overvoltage Protection Controllers MAX1807/MAX1808
ABSOLUTE MAXIMUM RATINGS
IN1_, TH to GND.......-0.3V to +6V ON, VDD, FAULT to GND.......-0.3V to +30V DP to GND........-0.3V to (VDD + 0.3V) Continuous Power Dissipation 10-Pin µMAX (derate 5.6mW/°C above +70°C)..448mW Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°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
(VDD = VON = 15V, VIN1VIN5 = 0.5V, VTH = 2.0V, CDP = 5nF, FAULT = open, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER GENERAL VDD Input Voltage Range VDD Operating Voltage Range VDD Undervoltage Lockout Threshold Supply Current Shutdown Current COMPARATORS (IN1IN5, TH) IN1IN5 Input Trip Level TH Input Trip Level, Falling TH Input Trip Level, Rising IN1IN5 Propagation Delay Rising edge, typical 1% hysteresis, VDD = 4.4V to 28V VDD = 4.4V to 28V (MAX1808 only) VDD = 4.4V to 28V (MAX1808 only) IN1IN5 rising, 10mV overdrive, VDD = 4.4V TH rising, 10mV overdrive, VDD = 4.4V (MAX1808 only) TH Propagation Delay TH falling, 10mV overdrive, VDD = 4.4V (MAX1808 only) IN1IN5 Input Leakage Current TH Input Leakage Current ON Input High Logic Level ON Input Low Logic Level ON Input Leakage Current FAULT Output High Leakage Current FAULT Output Low Voltage VIN = 1.5V VTH = 1.5V (MAX1808 only) VDD = 4.4V to 28V VDD = 4.4V to 28V VON = 5V VON = 28V V FAULT = 28V (MAX1807 only) ISINK = 4mA (MAX1807 only) 0.01 0.03 1.6 0.5 1.2 10 2 0.4 40 0.5 0.5 50 50 nA nA V V µA µA V 0.97 0.97 1.045 1 1 1.1 40 11 µs 1.03 1.03 1.155 V V V µs Rising trip level, typical 2% hysteresis; when VDD is below this level, DP = Hi and FAULT = Hi-Z VTH = 2V or 0.5V VDD = 15V, VON = GND, VIN1VIN5 = VTH = GND DP and FAULT in correct state (Table 1) 2 4.4 2 2.7 21 4 28 28 4.0 45 8.5 V V V µA µA SYMBOL CONDITIONS MIN TYP MAX UNITS
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Micropower Adjustable Overvoltage Protection Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VON = 15V, VIN1VIN5 = 0.5V, VTH = 2.0V, CDP = 5nF, FAULT = open, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER DP Source Current (PMOS Turn-Off) DP Sink Current (PMOS Turn-On) DP Pullup Current (PMOS Off) DP Turn-On Clamp Voltage (VDD - VDP) SYMBOL VON = VDD, VIN1 = 1.5V VDP = VDD - 5V VDP = VDD - 2V, VON = GND, in shutdown state VON = VDD, IDPSINK = 10µA VDD = 8.5V to 28V VDD = 4.4V 7.5 3.4 CONDITIONS VDP = VDD - 0.4V VDP = VDD - 2V MIN 1 5 4 TYP 50 20 50 25 9.5 4.1 11.5 4.4 MAX UNITS µA mA mA µA V
MAX1807/MAX1808
ELECTRICAL CHARACTERISTICS
(VDD = VON = 15V, VIN1VIN5 = 0.5V, VTH = 2.0V, CDP = 5nF, FAULT = open, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER GENERAL VDD Input Voltage Range VDD Operating Voltage Range VDD Undervoltage Lockout Threshold Supply Current Shutdown Current COMPARATORS (IN1IN5, TH) IN1IN5 Input Trip Level TH Input Trip Level, Falling TH Input Trip Level, Rising IN1IN5 Input Leakage Current TH Input Leakage Current ON Input High Logic Level ON Input Low Logic Level ON Input Leakage Current FAULT Output High Leakage Current FAULT Output Low Voltage DP Source Current (PMOS Turn-Off) DP Sink Current (PMOS Turn-On) DP Turn-On Clamp Voltage (VDD - VDP) Rising edge, typical 1% hysteresis VDD = 4.4V to 28V (MAX1808 only) VDD = 4.4V to 28V (MAX1808 only) VIN = 1.5V VTH = 1.5V (MAX1808 only) VDD = 4.4V to 28V VDD = 4.4V to 28V VON = 5V VON = 28V V FAULT = 28V (MAX1807 only) ISINK = 4mA (MAX1807 only) VON = VDD, VIN1 = 1.5V VDP = VDD - 5V VON = VDD, IDPSINK = 10µA VDD = 8.5V to 28V VDD = 4.4V VDP = VDD - 0.4V VDP = VDD - 2V 1 4 2 7.5 3.4 11.5 4.4 1.8 0.4 1.2 10 2 0.4 0.95 0.95 1.045 1.05 1.05 1.155 50 50 V V V nA nA V V µA µA V µA mA mA V Rising trip level, typical 2% hysteresis; when VDD is below this level, DP = Hi and FAULT = Hi-Z VTH = 2V or 0.5V VDD = 15V, VON = GND, VIN1VIN5 = VTH = GND DP and FAULT in correct state (Table 1) 2 4.4 2 28 28 4.0 45 8.5 V V V µA µA SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 1: Specifications to -40°C are guaranteed by design, not production tested. _______________________________________________________________________________________ 3
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