EVALUATION KIT AVAILABLE MAX6495MAX6499 72V, Overvoltage-Protection Switches/ Limiter Controllers with an External MOSFET General Description Features Wide Supply Voltage Range: +5.5V to +72V The MAX6495MAX6499 is a family of small, low-cur- rent, overvoltage-protection circuits for high-voltage Overvoltage-Protection Switch Controller Allows transient systems such as those found in automotive User to Size External n-Channel MOSFETs and industrial applications. These devices monitor the Fast Gate Shutoff During Overvoltage with 100mA input voltage and control an external n-channel MOSFET Sink Capability switch to isolate the load at the output during an input Internal Charge-Pump Circuit Ensures 10V overvoltage condition. The MAX6495MAX6499 operate Gate-to-Source Enhancement for Low R DS(ON) over a wide supply voltage range from +5.5V to +72V. Performance The gate of the n-channel MOSFET is driven high while n-Channel MOSFET Latches Off After an the monitored input is below the user-adjustable over- Overvoltage Condition (MAX6497/MAX6499) voltage threshold. An integrated charge-pump circuit Adjustable Overvoltage Threshold provides a 10V gate-to-source voltage to fully enhance Thermal Shutdown Protection the n-channel MOSFET. When the input voltage exceeds the user-adjusted overvoltage threshold, the Supports Series p-Channel MOSFET for Reverse- Battery Voltage Protection (MAX6496) gate of the MOSFET is quickly pulled low, disconnect- ing the load from the input. In some applications, dis- POK Indicator (MAX6497/MAX6498) connecting the output from the load is not desirable. In Adjustable Undervoltage Threshold (MAX6499) these cases, the protection circuit can be configured to -40C to +125C Operating Temperature Range act as a voltage limiter where the GATE output saw- Small, 3mm x 3mm TDFN Package tooths to limit the voltage to the load (MAX6495/ MAX6496/MAX6499). Ordering Information The MAX6496 supports lower input voltages and reduces power loss by replacing the external reverse PART PIN-PACKAGE TOP MARK battery diode with an external series p-channel MOSFET. MAX6495ATT+T 6 TDFN-EP* AJM The MAX6496 generates the proper bias voltage to MAX6495ATT/V+T 6 TDFN-EP* AUG ensure that the p-channel MOSFET is on during normal operations. The gate-to-source voltage is clamped dur- Ordering Information continued at end of data sheet. Note: All devices are specified over the -40C to +125C operating ing load-dump conditions, and the p-channel MOSFET temperature range. is off during reverse-battery conditions. +Denotes a lead(Pb)-free/RoHS-compliant package. Functional Diagrams The MAX6497/MAX6498 feature an open-drain, undedi- T = Tape and reel. cated comparator that notifies the system if the output *EP = Exposed pad. falls below the programmed threshold. The MAX6497 /V denotes an automotive qualified part. keeps the MOSFET switch latched off until either the Selector Guide appears at end of data sheet. input power or the SHDN pin is cycled. The MAX6498 will autoretry when V falls below 130mV. OVSET Pin Configurations These devices are available in small, thermally TOP VIEW OUTFB GATE GND enhanced, 6-pin and 8-pin TDFN packages and are 65 4 fully specified from -40C to +125C. Applications Automotive Industrial MAX6495 Telecom/Servers/Networking FireWire Notebook Computers 12 3 IN SHDN OVSET Pin Configurations appear at end of data sheet. 3mm x 3mm TDFN Functional Diagrams continued at end of data sheet. Pin Configurations continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. FireWire is a registered trademark of Apple Computer, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-3778 Rev 9 2/12 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLEMAX6495MAX6499 72V, Overvoltage-Protection Switches/ Limiter Controllers with an External MOSFET ABSOLUTE MAXIMUM RATINGS (All pins referenced to GND.) IN, GATE, GATEP...................................................-0.3V to +80V Continuous Power Dissipation (T = +70C) A SHDN, CLEAR .............................................-0.3V to (V + 0.3V) 6-Pin TDFN (derate 18.2mW/C above +70C) .........1455mW IN POK, OUTFB ..........................................................-0.3V to +80V 8-Pin TDFN (derate 18.2mW/C above +70C) .........1455mW GATE to OUTFB .....................................................-0.3V to +12V Operating Temperature Range .........................-40C to +125C GATEP to IN ...........................................................-12V to +0.3V Junction Temperature......................................................+150C OVSET, UVSET, POKSET .......................................-0.3V to +12V Storage Temperature Range .............................-60C to +150C Current Sink/Source (All Pins).............................................50mA Lead Temperature (soldering, 10s) .................................+300C All Other Pins to GND ..................................-0.3V to (V + 0.3V) Soldering Temperature (reflow) .......................................+260C IN 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 = 14V, C = 6nF, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) IN GATE A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V 5.5 72.0 V IN SHDN = high 100 150 SHDN = low (MAX6497/MAX6498/ 15 24 Input Supply Current I No load A IN MAX6499) SHDN = low (MAX6495/MAX6496) 24 32 IN Undervoltage Lockout V rising, enables GATE 4.75 5 5.25 V IN IN Undervoltage Lockout V falling, disables GATE 155 mV IN Hysteresis V OVSET rising 1.22 1.24 1.26 OVSET Threshold Voltage TH+ V (MAX6495/MAX6496) V OVSET falling 1.18 TH- OVSET Threshold Hysteresis V OVSET falling 5 % HYST (MAX6495/MAX6496) V OVSET rising 0.494 0.505 0.518 OVSET Threshold Voltage TH+ V (MAX6497/MAX6498) V OVSET falling 0.13 TH- V OVSET rising 1.22 1.24 1.26 OVSET Threshold Voltage TH+ V (MAX6499) V OVSET falling 1.18 TH- V UVSET rising 1.22 1.24 1.26 UVSET Threshold Voltage TH+ V (MAX6499) V UVSET falling 1.18 TH- OVSET/UVSET Threshold V OVSET falling 5 % HYST Hysteresis (MAX6499) V POKSET rising 1.22 1.24 1.26 POKSET Threshold Voltage POKSET+ V (MAX6497/MAX6498) V POKSET falling 1.18 POKSET- POKSET Threshold Hysteresis (MAX6497/ V POKSET falling 5 % HYST MAX6498) OVSET, UVSET, POKSET I -50 +50 nA SET Input Current Startup Response Time t SHDN rising (Note 2) 100 s START GATE rising from GND to V + 8V, OUTFB GATE Rise Time 1ms OUTFB = GND 2 Maxim Integrated