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LTC4221IGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC4221IGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC4221 4221f Dual Hot Swap Controller/ Power Sequencer with Dual Speed, Dual Level Fault Protection ■ Allows Safe Board Insertion and Removal from a Live Backplane ■ Configurable Power Supply Sequencing ■ Soft-Start with Current Foldback Limits Inrush Current ■ No External Gate Capacitor Required ■ Adjustable Dual Level Circuit Breaker Protection ■ Controls Supply Voltages from 1V to 13.5V ■ Independent N-Channel MOSFET High Side Drivers ■ FB Pin Monitors VOUT for Overvoltage Protection ■ Latch Off or Automatic Retry on Current Fault ■ FAULT and PWRGD Outputs ■ Narrow 16-Pin SSOP Package ■ Electronic Circuit Breaker ■ Power Supply Sequencing ■ Live Board Insertion and Removal ■ Industrial High Side Switch/Circuit Breaker The LTC ®4221 is a 2-channel Hot SwapTM controller that allows a board to be safely inserted and removed from a live backplane. Using two independent high side gate drivers to control two external N-channel pass transistors, the output voltages can be ramped up with current foldback to limit the inrush current during the start-up period. No external compensation capacitors are required at the GATE pins. The two channels can be configured to ramp up and down separately or simultaneously for supply volt- ages ranging from 2.7V to 13.5V and 1V to 13.5V for channels 1 and 2 respectively. Each channel has two current limit comparators that provide dual level and dual speed overcurrent circuit breaker protection after the start-up period. If any current sense voltage exceeds 100mV for 1µs or 25mV for the timeout delay (set by the CFILTER at the FILTER pin), then the FAULT latch is set and both GATE pins are pulled low. The FB pins monitor the respective channel output volt- ages and provide the inputs for the PWRGD comparators as well as overvoltage protection. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. 2-Channel Hot Swap Controller ON2 FAULT GND LTC4221 FB2 PWRGD2 PWRGD1 PWRGD2 VOUT1 3.3V/5A VOUT2 2.5V/5A PWRGD1 FB1 LONG LONG SHORT GND FAULT LONG *SMAJ10 (OPTIONAL) SHORT TIMER FILTER ON1 VCC1 SENSE1 GATE1 VCC2 SENSE2 GATE2 SHORT VCC1 3.3V VCC2 2.5V BACKPLANE CONNECTOR (FEMALE) PCB EDGE CONNECTOR (MALE) 10Ω 21k 13.3k 10k 10k 10Ω 14.3k IRF7413 5.11k 10k 10k 20k 5.11k 4221 TA01 100nF * * 1nF 470nF 100nF IRF7413 0.004Ω 0.004Ω DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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