LTC4210-2IS6

LTC4210-1/LTC4210-2 Hot Swap Controller in 6-Lead SOT-23 Package FEATURES s s DESCRIPTIO s s s s s s s s 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 16.5V Undervoltage Lockout Adjustable Overvoltage Protection Low Profile (1mm) SOT-23 (ThinSOTTM) Package The LTC®4210 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 16.5V. 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. This part is available in two options: the LTC4210-1 for automatic retry on overcurrent fault and the LTC4210-2 for latch off on an overcurrent fault. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. APPLICATIO S s s s Hot Board Insertion Electronic Circuit Breaker Industrial High Side Switch/Circuit Breaker TYPICAL APPLICATIO BACKPLANE PCB EDGE CONNECTOR CONNECTOR (FEMALE) (MALE) VIN 5V LONG Single Channel 5V Hot Swap Controller RSENSE 0.01Ω Z1 OPTIONAL RX 10Ω CX 0.1µF VCC SENSE GATE Q1 Si4410DY + RG 100Ω RC 100Ω CC 0.01µF VOUT 5V 470µF 4A CLOAD SHORT RON1 20k ON RON2 10k LTC4210 TIMER GND CTIMER 0.22µF GND LONG Z1: ISMA10A OR SMAJ10A GND 4210 TA01 U Power-Up Sequence CLOAD = 470µF VON (2V/DIV) VTIMER (1V/DIV) VOUT (5V/DIV) IOUT (0.5A/DIV) 10ms/DIV 4210 TA02 U U 421012f 1 LTC4210-1/LTC4210-2 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 LTC4210-1C/LTC4210-2C ....................... 0°C to 70°C LTC4210-1I/LTC4210-2I .................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C LTC4210-1CS6 LTC4210-2CS6 LTC4210-1IS6 LTC4210-2IS6 S6 PART MARKING LTYW LTYX LTF5 LTF6 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 230°C/ W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS SYMBOL VCC ICC VLKOR VLKOHYST IINON IINSENSE VCB IGATEUP IGATEDN ∆VGATE PARAMETER Supply Voltage 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 q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = 5V, unless otherwise noted. (Note 2) CONDITIONS q q MIN 2.7 2.2 –10 –10 44 –5 TYP 0.65 2.5 100 0 5 50 – 10 25 VCC Rising q q MAX 16.5 3.5 2.65 10 10 56 –15 External N-Channel Gate Drive 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 VGATE – VCC, VCC = 12V VGATE – VCC, VCC = 15V 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 q q q UNITS V mA V mV µA µA mV µA mA q q q q q q q q q q q q 4.0 4.5 5.0 10 9.0 6.0 –2 –25 1.22 0.15 1.22 6.5 7.5 8.5 12 12 11 –5 –60 2 100 1.3 0.2 100 1.3 80 8 10 12 16 16 18 –8.5 –100 3.5 1.38 0.25 1.38 421012f 2 U V V V V V V µA µA µA µA V V mV V mV W U U WW W LTC4210-1/LTC4210-2 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 q 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: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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 on the GATE pin clamps the charge pump voltage to a typical maximum voltage of 26V. External overdrive of the GATE pin beyond the internal Zener voltage may damage the device. Without a limiting resistor, the GATE capacitance must be