MAX4843MAX4846 19-3649 Rev 5 12/09 Overvoltage Protection Controllers with Low Standby Current General Description Features The MAX4843MAX4846 overvoltage protection con- Overvoltage Protection Up to 28V trollers protect low-voltage systems against high-voltage Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip faults of up to 28V. When the input voltage exceeds the Level overvoltage threshold, these devices turn off a low-cost, external n-channel FET(s) to prevent damage to the pro- Low (10A) Undervoltage Lockout Standby tected components. An internal charge pump eliminates Current the need for external capacitors and drives the FET gate Drives Low-Cost nMOSFET for a simple, robust solution. The overvoltage trip level is set to 7.4V (MAX4843), Internal 50ms Startup Delay 6.35V (MAX4844), 5.8V (MAX4845), or 4.65V Internal Charge Pump (MAX4846). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices Overvoltage Fault FLAG Indicator enter a low standby current mode (10A). The 6-Pin (1.5mm x 1.0mm) DFN Package MAX4843/MAX4844/MAX4845 have a UVLO threshold of 4.15V, the MAX4845C/MAX4845D have a UVLO Ordering Information threshold of 2.2V, and the MAX4846 has a UVLO threshold of 2.5V. In addition to the single FET configu- PIN- UVLO OVLO TOP ration, the devices can be configured with back-to- PART PACKAGE (V) (V) MARK back external FETs to prevent currents from being back-driven into the adapter. MAX4843ELT 6 DFN 4.15 7.40 BE MAX4844ELT 6 DFN 4.15 6.35 BF An additional feature includes a 15kV ESD-protected input when bypassed with a 1F capacitor to ground. MAX4845ELT 6 DFN 4.15 5.80 BG All devices are offered in small 6-pin DFN (1.5mm x MAX4845EYT+T 6 UTLGA 4.15 5.80 AC 1.0mm) and 6-pin ultra-thin LGA (MAX4845 and MAX4845CEYT+T 6 UTLGA 2.20 5.80 AP MAX4846 only) (1.5mm x 1.0mm) packages and are MAX4845DEYT+T 6 UTLGA 2.20 5.80 AQ specified for operation over the -40C to +85C temper- ature range. MAX4846ELT 6 DFN 2.50 4.65 BH MAX4846EYT+T 6 UTLGA 2.50 4.65 AD Applications Note: All devices are specified over the -40C to +85C tem- Cell Phones perature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Digital Still Cameras T = Tape and reel. PDAs and Palmtop Devices OVLO maximum is 6.0V for the MAX4845C and 5.9V for the MP3 Players MAX4845D. Typical Operating Circuit Pin Configurations INPUT TOP VIEW OUTPUT +1.2V TO +28V N N.C. N.C. GATE N.C. N.C. GATE 6 5 4 6 5 4 1 4 IN GATE MAX4843 MAX4845 MAX4846 MAX4846 1F V IO MAX4843 MAX4846 1 2 3 1 2 3 GND GND IN FLAG IN FLAG 2 3 GND FLAG DFN ULTRA-THIN LGA Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Overvoltage Protection Controllers with Low Standby Current ABSOLUTE MAXIMUM RATINGS IN to GND ..............................................................-0.3V to +30V Operating Temperature Range ..........................-40C to +85C GATE to GND ........................................................-0.3V to +12V Junction Temperature .................................................... +150C FLAG to GND ..........................................................-0.3V to +6V Storage Temperature Range ............................-65C to +150C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) A 6-Pin DFN (derate 2.1mW/C above +70C) .........167.7mW 6-Pin DFN...................................................................+240C 6-Pin Ultra-Thin LGA (derate 2.1mW/C 6-Pin Ultra-Thin LGA ....................................................+260C above +70C) ...........................................................170.2mW 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 = +5V for MAX4843/MAX4844/MAX4845, V = +4V for MAX4846, C = 500pF, T = -40C to +85C, unless otherwise IN IN GATE A noted. Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 1.2 28.0 V IN MAX4843/MAX4844/MAX4845 3.9 4.15 4.4 Undervoltage Lockout Threshold UVLO V falling V IN MAX4845C/MAX4845D 1.8 2.2 2.5 MAX4846 2.3 2.5 2.7 MAX4843/MAX4844/MAX4845 41 Undervoltage Lockout mV Hysteresis MAX4846 25 MAX4843 7.0 7.4 7.8 MAX4844 6.0 6.35 6.7 MAX4845 5.5 5.8 6.1 Overvoltage Trip Level OVLO V rising V IN MAX4845C 5.5 5.8 6.0 MAX4845D 5.5 5.8 5.9 MAX4846 4.35 4.65 4.95 MAX4843 75 MAX4844 65 Overvoltage Lockout Hysteresis mV MAX4845 55 MAX4846 50 MAX4843/MAX4844/MAX4845 70 120 IN Supply Current I A IN MAX4846 60 110 V = 3.8V MAX4843/MAX4844/MAX4845 10 22 IN UVLO Supply Current I A UVLO V = 2.2V MAX4846 8 18 IN MAX4843/MAX4844/MAX4845 9 9.83 10 Gate Voltage V 1A load V GATE MAX4846 7.5 7.85 8.0 GATE Pulldown Current I V > OVLO, V = 5.5V 10 27 mA PD IN GATE FLAG Output Low Voltage V I = 1mA, FLAG deasserted 0.4 V OL SINK FLAG Leakage Current V = 5.5V, FLAG asserted 1 A FLAG 2 MAX4843MAX4846