MAX1807/MAX1808 19-1791 Rev 0 10/00 Micropower Adjustable Overvoltage Protection Controllers General Description Features The MAX1807/MAX1808 monitor up to five supply rails Five 3% Accurate Overvoltage Comparators for an overvoltage condition and provide a latched out- Series PFET Gate Driver with VGS Limiter put when any one of the five supplies exceeds the trip thresholds. The latched output drives an external P- 21A Quiescent Supply Current channel load switch to remove power when an over- 4A Shutdown Current voltage condition is detected. The latch is reset when a logic low is input to ON or the power supply is cycled. 4.4V to 28V Operating Voltage Range The MAX1807 provides a 28V open-drain fault output 3% Accurate Comparator with 10% Hysteresis for that can be used to trigger an alert, trip a resetable Low-Battery Detection (MAX1808) fuse, or for other purposes. The MAX1808 includes a low-battery comparator with hysteresis to drive the DP 28V Open-Drain N-Channel Output (MAX1807) output high, turning off the external P-channel switch Small 10-Pin MAX Package when the input voltage is too low. The MAX1807/MAX1808 are available in a miniature 10- pin MAX package. Ordering Information Applications Notebook Computers PART TEMP. RANGE PIN-PACKAGE Power-Supply Modules MAX1807EUB -40C to +85C 10 MAX Multi-Output Power Supplies MAX1808EUB -40C to +85C 10 MAX Pin Configuration and Typical Operating Circuit appear at end of data sheet. Functional Diagram V DD 2.5V ON INTERNAL POWER-ON 1V REF SUPPLY REF OK PMOS RESET POWER DP (60 s) + TH DRIVER (MAX1808) ++ IN1 - RQ S IN2 + FAULT (MAX1807) IN3 + + IN4 GND MAX1807 + IN5 MAX1808 Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Micropower Adjustable Overvoltage Protection Controllers ABSOLUTE MAXIMUM RATINGS IN1 , TH to GND.......................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C ON, V , FAULT to GND........................................-0.3V to +30V Junction Temperature......................................................+150C DD DP to GND..................................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD Continuous Power Dissipation Lead Temperature (soldering, 10s) .................................+300C 10-Pin MAX (derate 5.6mW/C above +70C)...........448mW 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 (V = V = 15V, V V = 0.5V, V = 2.0V, C = 5nF, FAULT = open, T = 0C to +85C, unless otherwise noted.) DD ON IN1 IN5 TH DP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL V Input Voltage Range DP and FAULT in correct state (Table 1) 2 28 V DD V Operating Voltage Range 4.4 28 V DD V Undervoltage Lockout Risi ng tr i p lev el, ty pi cal 2% hysteres is whe n V DD D D 2 2.7 4.0 V Threshold i s bel ow thi s l evel, D P = H i and FAU LT = H i - Z Supply Current V = 2V or 0.5V 21 45 A TH Shutdown Current V = 15V, V = GND , V V = V = GND 4 8.5 A D D ON IN1 IN5 TH COMPARATORS (IN1IN5, TH) Rising edge, typical 1% hysteresis, IN1IN5 Input Trip Level 0.97 1 1.03 V V = 4.4V to 28V DD TH Input Trip Level, Falling V = 4.4V to 28V (MAX1808 only) 0.97 1 1.03 V DD TH Input Trip Level, Rising V = 4.4V to 28V (MAX1808 only) 1.045 1.1 1.155 V DD IN1IN5 Propagation Delay IN1IN5 rising, 10mV overdrive, V = 4.4V 40 s DD TH rising, 10mV overdrive, V = 4.4V DD 11 (MAX1808 only) TH Propagation Delay s TH falling, 10mV overdrive, V = 4.4V DD 40 (MAX1808 only) IN1IN5 Input Leakage Current V = 1.5V 0.5 50 nA IN TH Input Leakage Current V = 1.5V (MAX1808 only) 0.5 50 nA TH ON Input High Logic Level V = 4.4V to 28V 1.6 V DD ON Input Low Logic Level V = 4.4V to 28V 0.5 V DD V = 5V 0.03 1.2 ON ON Input Leakage Current A V = 28V 10 ON FAULT Output High Leakage V = 28V (MAX1807 only) 0.01 2 A FAULT Current FAULT Output Low Voltage I = 4mA (MAX1807 only) 0.4 V SINK 2 MAX1807/MAX1808