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LTC4211 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4211 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC4211 1 4211fb TYPICAL APPLICATION FEATURES DESCRIPTION Hot Swap Controller with Multifunction Current Control APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Allows Safe Board Insertion and Removal from a Live Backplane n Controls Supply Voltages from 2.5V to 16.5V n Programmable Soft-Start with Inrush Current Limiting, No External Gate Capacitor Required n Faster Turn-Off Time Because No External Gate Capacitor is Required n Dual Level Overcurrent Fault Protection n Programmable Response Time for Overcurrent Protection (MS) n Programmable Overvoltage Protection (MS) n Automatic Retry or Latched Mode Operation (MS) n High Side Drive for an External N-Channel FET n User-Programmable Supply Voltage Power-Up Rate n FB Pin Monitors VOUT and Signals RESET n Glitch Filter Protects Against Spurious RESET Signal n Electronic Circuit Breaker n Hot Board Insertion and Removal (Either On Backplane or On Removable Card) n Industrial High Side Switch/Circuit Breaker The LTC®4211 is a Hot Swap™ 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 supply voltages ranging from 2.5V to 16.5V. The LTC4211 provides soft-start and inrush current limiting during the start-up period which has a programmable duration. Two on-chip current limit comparators provide dual level overcurrent circuit breaker protection. The slow com- parator trips at VCC – 50mV and activates in 20μs (or is programmed by an external filter capacitor, MS only). The fast comparator trips at VCC – 150mV and typically responds in 300ns. The FB pin monitors the output supply voltage and signals the RESET output pin. The ON pin signal turns the chip on and off and can also be used for the reset function. The MS package has FAULT and FILTER pins to provide addi- tional functions like fault indication, autoretry or latch-off modes, programmable current limit response time and programmable overvoltage protection using an external Zener diode clamp. Single Channel 5V Hot Swap Controller Power-Up Sequence + VCC SENSE LTC4211 8 2 34 76 CLOAD VOUT 5V 5A GND 4211 TA01A 5 1 R4 15k GATE GND TIMER PCB CONNECTION SENSE CTIMER 10nF FB ON SHORT LONG VCC 5V GND LONG Z1 = 1SMA10A OR SMAJ10A * OPTIONAL RESET R2 10k R1 20k RX 10Ω RSENSE 0.007Ω PCB EDGE CONNECTOR (MALE) M1 Si4410DY Z1* R3 36k R5 10k μP LOGIC RESET CX 100nF BACKPLANE CONNECTOR (FEMALE) 4211 TA01b 2.5ms/DIV NO CLOAD VGATE 5V/DIV VRESET 5V/DIV VON 1V/DIV VTIMER 1V/DIV |
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