MAX4923MAX4926 19-0810 Rev 0 4/07 Overvoltage Protectors with External pFET General Description Features The MAX4923MAX4926 overvoltage protection Overvoltage Protection Up to +28V (OVP) controllers protect low-voltage systems against high-voltage faults of up to +28V with an appropriate Preset 7.18V, 6.16V, 5.65V, and 4.46V Typical external pFET. When the input voltage exceeds the over- Overvoltage Trip Levels voltage lockout (OVLO) threshold, or falls below the Preset 2.44V Typical Undervoltage Trip Level undervoltage lockout (UVLO) threshold, these devices turn off the pFET to prevent damage to protected compo- 2.5% Accurate Overvoltage/Undervoltage nents and issue a flag to notify the processor of a fault Trip Levels condition. Low 13A (typ) Supply Current The typical overvoltage trip level is set to 7.18V (MAX4923), 6.16V (MAX4924), 5.65V (MAX4925), and Drives External pFET 4.46V (MAX4926). The undervoltage trip level is set to 20ms Adapter Debounce Time 2.44V (typ) for all devices. Fault Flag Indicator The input (IN) is ESD protected to 15kV HBM when bypassed to ground with a 1F ceramic capacitor. All 6-Pin (1.5mm x 1.0mm) DFN Package devices are offered in a small, 6-pin (1.5mm x 1.0mm) DFN package and are specified over the extended -40C to +85C temperature range. Typical Operating Circuit Applications Cell Phones Digital Still Cameras INPUT +1.8V TO 28V OUTPUT P PDAs and Palmtop Devices MP3 Players Pin Configuration 1 4 IN GATE 1F TOP VIEW N.C N.C GATE MAX4923MAX4926 V IO 65 4 3 2 GND FLAG MA4923MAX4926 12 3 IN GND FLAG DFN Ordering Information/Selector Guide PART PIN-PACKAGE OVLO (V) UVLO (V) TOP MARK PKG CODE MAX4923ELT+* 6 DFN 7.18 2.44 LB L611-1 MAX4924ELT+ 6 DFN 6.16 2.44 LC L611-1 MAX4925ELT+ 6 DFN 5.65 2.44 LD L611-1 MAX4926ELT+ 6 DFN 4.46 2.44 LE L611-1 Note: All devices are specified over the -40C to +85C operating temperature range. +Denotes lead-free package. *Future Productcontact factory for availability. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Overvoltage Protectors with External pFET ABSOLUTE MAXIMUM RATINGS IN, GATE to GND....................................................-0.3V to +30V Operating Temperature Range ...........................-40C to +85C FLAG to GND ...........................................................-0.3V to +6V Junction Temperature .....................................................+150C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 6-DFN (derate 2.1mW/C above 70C).......................168mW 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 (V = +5V for MAX4923/MAX4924/MAX4925, V = +4V for MAX4926, C = 500pF to IN, 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 1.8 28.0 V IN MAX4923 7.00 7.18 7.36 MAX4924 6.00 6.16 6.31 Overvoltage Lockout Level OVLO V rising V IN MAX4925 5.50 5.65 5.79 MAX4926 4.35 4.46 4.57 MAX4923 65 MAX4924 55 Overvoltage Lockout Hysteresis mV MAX4925 50 MAX4926 40 Undervoltage Lockout Level UVLO V falling 2.378 2.439 2.500 V IN Undervoltage Lockout Hysteresis 20 mV MAX4923/MAX4924/MAX4925 14 25 IN Supply Current I A IN MAX4926 13 23 V - IN GATE Voltage High V V > 8V, I = 0.1mA V OH IN SOURCE 0.2 GATE Pulldown Current I V = V 6.5 12 mA PD GATE IN FLAG Low Voltage V I = 1mA 0.4 V OL SINK FLAG Leakage Current I V = 5.5V -1 +1 A LKG FLAG TIMING CHARACTERISTICS V < V < V time for GATE to go UVLO IN OVLO, Debounce Time t 10 20 34 ms DEB low (Figure 1) V = 5V to 0.5V GATE Gate Turn-on Time t (MAX4923/MAX4924/MAX4925) or 0.6 s GON V = 4V to 0.5V (MAX4926) (Figure 1) GATE V rising at 1V/s from 5V to 8V IN (MAX4923/MAX4924/MAX4925) or from 4V Gate Turn-Off Time t 520 s GOFF to 7V (MAX4926) to V = V -0.5V GATE IN (Figure 1) V rising at 1V s from 5V to 8V IN (MAX4923/MAX4924/MAX4925) or from 4V Flag Assertion Delay t 4.5 s FLAG to 7V (MAX4926), to V = 2.4V, FLAG R = 10k to 3V (Figure 1) FLAG Note 1: All devices are 100% tested at +25C. Electrical limits across the full temperature range are guaranteed by design and characterization. 2 MAX4923MAX4926