MAX14527/MAX14528 19-4357 Rev 0 10/08 Adjustable Overvoltage Protector with High Accuracy General Description Features The MAX14527/MAX14528 overvoltage protection Input Voltage Protection Up to +28V devices feature a low 100m (typ) R internal FET ON Preset Internal 2.5% Accurate OVLO Thresholds and protect low-voltage systems against voltage faults 5.75V (MAX14527) up to +28V. When the input voltage exceeds the over- 6.76V (MAX14528) voltage threshold, the internal FET is turned off to pre- vent damage to the protected components. Adjustable Overvoltage Protection Trip Level The overvoltage protection threshold can be adjusted Integrated 100m (typ) n-Channel MOSFET with optional external resistors to any voltage between Switch 4V and 8V. With the OVLO input set below the external Soft-Start to Minimize In-Rush Current OVLO select voltage, the MAX14527/MAX14528 auto- matically choose the internal 2.5% accurate trip Automatic Overvoltage Protection Trip-Level thresholds. The internal overvoltage thresholds (OVLO) Selection are preset to 5.75V typical (MAX14527) or 6.76V typical Internal 15ms Startup Delay (MAX14528). The MAX14527/MAX14528 are also protected against overcurrent events with an internal Thermal Shutdown Protection thermal shutdown. 8-Pin TDFN (2mm x 2mm) Package The MAX14527/MAX14528 are offered in a small, 8-pin -40C to +85C Operating Temperature Range TDFN-EP package and operate over the -40C to +85C extended temperature range. Applications Ordering Information Cell Phones TOP OVLO PART PIN-PACKAGE MARK (V) Media Players MAX14527ETA+T 8 TDFN-EP* ACR 5.75 PDAs and Palmtop Devices MAX14528ETA+T 8 TDFN-EP* ACS 6.76 Note: Devices are specified over the -40C to +85C tempera- ture range. +Denotes a lead-free/RoHS-compliant package. Pin Configuration appears at end of data sheet. T = Tape and reel. *EP = Exposed pad. Typical Application Circuit VBUS CHARGER IN OUT USB INPUT 1F CONNECTOR IN OUT PMIC MAX14527 R1 MAX14528 OVLO GND * R2 *R1 AND R2 ARE REQUIRED ONLY FOR ADJUSTABLE OVLO OTHERWISE, CONNECT OVLO TO GND. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim s website at www.maxim-ic.com.Adjustable Overvoltage Protector with High Accuracy ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Package Junction-to-Ambient Thermal Resistance ( ) JA IN............................................................................-0.3V to +30V (Note 2) .....................................................................83.9C/W OUT .............................................................-0.3V to (V + 0.3V) Package Junction-to-Case Thermal Resistance ( ) IN JC OVLO........................................................................-0.3V to +6V (Note 2) ........................................................................37C/W Continuous IN Current .............................................................1A Operating Temperature Range ...........................-40C to +85C Peak IN Current (Note 1)..........................................................5A Junction Temperature......................................................+150C Continuous OVLO Current ...................................................50A Storage Temperature Range .............................-65C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering).........................................+300C A 8-Pin TDFN (derate 11.9mW/C above +70C) ...........954mW Note 1: Limited by thermal shutdown. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 = +2.2V to +28V, T = -40C to +85C, unless otherwise noted. Typical values are at V = +5.0V and T = +25C.) (Note 3) IN A IN A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 2.2 28 V IN Input Supply Current I V < OVLO 80 160 A IN IN MAX14527 5.6 5.75 5.9 V rising IN MAX14528 6.55 6.765 7 IN Overvoltage Trip Level V V IN OVLO MAX14527 5.54 5.84 V falling IN MAX14528 6.5 6.95 IN Overvoltage Lockout Hysteresis V 1% IN OVLO HYS OVLO Set Threshold V 1.2 1.245 1.29 V OVLO THRESH Adjustable OVLO Threshold Range 48V External OVLO Select Threshold V 0.15 0.33 0.5 V OVLO SELECT Switch On-Resistance R 100 200 m ON OVLO Clamp I = 10A 3 4.56 5.5 V CLAMP OUT Capacitor C 1000 F OUT OVLO Input Leakage Current I V = 1.245V -100 +100 nA OVLO OVLO THRESH Thermal Shutdown 150 C Thermal Shutdown Hysteresis 20 C TIMING CHARACTERISTICS (Figure 1) Time from 2.2V < V < V to IN IN OVLO Debounce Time t 15 ms INDBC V = 10% of V OUT IN 2.2V < V < V , R = 100, IN IN OVLO LOAD C = 100F V from 10% to 0.7 LOAD OUT 90% of V IN Switch Turn-On Time t ms ON 2.2V < V < V , R = 100, IN IN OVLO LOAD C = 1mF V from 10% to 90% 1.4 LOAD OUT of V IN V > V to V = 80% of IN OVLO THRESH OUT Switch Turn-Off Time t V R = 1k, V rising at 1.3 3.5 s OFF IN OVLO LOAD IN 2V/100ns Note 3: All specifications are 100% production tested at T = +25C, unless otherwise noted. Specifications are over -40C to +85C A and are guaranteed by design. 2 MAX14527/MAX14528