LTC4210-4

LTC4210-3/LTC4210-4 Hot Swap Controller in 6-Lead SOT-23 Package FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Allows Safe Board Insertion and Removal from a Live Backplane Adjustable Analog Current Limit with Circuit Breaker Fast Response Limits Peak Fault Current Automatic Retry or Latch Off On Current Fault Adjustable Supply Voltage Power-Up Rate High Side Drive for External MOSFET Switch Controls Supply Voltages from 2.7V to 7V Undervoltage Lockout Adjustable Overvoltage Protection Low Profile (1mm) SOT-23 (ThinSOTTM) Package The LTC®4210-3/LTC4210-4 is a 6-pin SOT-23 Hot SwapTM controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the GATE of an external N-channel MOSFET for a supply voltage ranging from 2.7V to 7V. The LTC4210 provides the initial timing cycle and allows the GATE to be ramped up at an adjustable rate. The LTC4210 features a fast current limit loop providing active current limiting together with a circuit breaker timer. The signal at the ON pin turns the part on and off and is also used for the reset function. The LTC4210-3 retries on overcurrent fault and the LTC4210-4 latches off on an overcurrent fault. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIO S ■ ■ ■ Hot Board Insertion Electronic Circuit Breaker Industrial High Side Switch/Circuit Breaker TYPICAL APPLICATIO BACKPLANE PCB EDGE CONNECTOR CONNECTOR (MALE) (FEMALE) Single Channel 5V Hot Swap Controller VIN 5V LONG Z1 OPTIONAL 10Ω 0.1µF RSENSE 0.01Ω Q1 Si4410DY + 470µF VOUT 5V 4A VCC SHORT 20k SENSE GATE 100Ω ON LTC4210-3 10k 100Ω 0.01µF TIMER GND 0.22µF GND LONG Z1: ISMA10A OR SMAJ10A GND 4210 TA01 U Power-Up Sequence CLOAD = 470µF U U VON (2V/DIV) VTIMER (1V/DIV) VOUT (5V/DIV) IOUT (0.5A/DIV) 10ms/DIV 4210 TA02 421034fa 1 LTC4210-3/LTC4210-4 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW TIMER 1 GND 2 ON 3 6 VCC 5 SENSE 4 GATE Supply Voltage (VCC) ............................................... 17V Input Voltage (SENSE, TIMER) .. – 0.3V to (VCC + 0.3V) Input Voltage (ON) ..................................... –0.3V to 17V Output Voltage (GATE) ........ Internally Limited (Note 3) Operating Temperature Range LTC4210-3C/LTC4210-4C ....................... 0°C to 70°C LTC4210-3I/LTC4210-4I .................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C LTC4210-3CS6 LTC4210-4CS6 LTC4210-3IS6 LTC4210-4IS6 S6 PART MARKING LTCPJ LTCPM LTCPK LTCPN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 230°C/ W Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS SYMBOL VCC ICC VLKOR VLKOHYST IINON IINSENSE VCB IGATEUP IGATEDN ∆VGATE PARAMETER VCC Supply Current VCC Undervoltage Lockout Release VCC Undervoltage Lockout Hysteresis ON Pin Input Current SENSE Pin Input Current Circuit Breaker Trip Voltage GATE Pin Pull-Up Current GATE Pin Pull-Down Current The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = 5V, unless otherwise noted. (Note 2) CONDITIONS Supply Voltage VCC Rising ● ● ● ● MIN 2.7 2.2 –10 –10 44 –5 TYP 0.75 2.5 100 0 5 50 – 10 25 MAX 7.0 3.5 2.65 10 10 56 –15 External N-Channel Gate Drive VGATE GATE Pin Voltage ITIMERUP ITIMERDN VTIMER VTMRHYST VON VONHYST TIMER Pin Pull-Up Current TIMER Pin Pull-Down Current TIMER Pin Threshold TIMER Low Threshold Hysteresis ON Pin Threshold ON Pin Threshold Hysteresis VSENSE = VCC VCB = (VCC – VSENSE) VGATE = 0V VTIMER = 1.5V, VGATE = 3V or VON = 0V, VGATE = 3V or VCC – VSENSE = 100mV, VGATE = 3V VGATE – VCC, VCC = 2.7V VGATE – VCC, VCC = 3V VGATE – VCC, VCC = 3.3V VGATE – VCC, VCC = 5V VCC = 2.7V VCC = 3.0V VCC = 3.3V VCC = 5.0V Initial Cycle, VTIMER = 1V During Current Fault Condition, VTIMER = 1V After Current Fault Disappears, VTIMER = 1V Under Normal Conditions, VTIMER = 1V High Threshold, TIMER Rising Low Threshold, TIMER Falling ON Threshold, ON Rising ● ● ● UNITS V mA V mV µA µA mV µA mA ● ● ● ● ● ● ● ● ● ● ● ● ● ● 4.0 4.5 5.0 5.0 6.7 7.5 8.3 10.0 –2 –25 1.22 0.15 1.22 6.5 7.5 8.5 7.0 9.2 10.5 11.8 12.0 –5 –60 2 100 1.3 0.2 100 1.3 80 8 10 9.7 8.0 10.7 13.0 13.0 13.0 –8.5 –100 3.5 1.38 0.25 1.38 421034fa 2 U V V V V V V V V µA µA µA µA V V mV V mV W U U WW W LTC4210-3/LTC4210-4 ELECTRICAL CHARACTERISTICS SYMBOL tOFF(TMRHIGH) tOFF(ONLOW) tOFF(VCCLOW) PARAMETER Turn-Off Time (TIMER Rise to GATE Fall) Turn-Off Time (ON Fall to GATE Fall) Turn-Off Time (VCC Fall to IC Reset) The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = 5V, unless otherwise noted. (Note 2) CONDITIONS VTIMER = 0V to 2V Step, VCC = VON = 5V VON = 5V to 0V Step, VCC = 5V VCC = 5V to 2V Step, VON = 5V MIN TYP 1 30 30 MAX UNITS µs µs µs Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 3: An internal Zener clamped the GATE pin to a typical voltage of 12V. External overdrive of the GATE pin beyond the internal Zener voltage may damage the device. Without a limiting resistor, the GATE capacitance must be