LTC1645 Datasheet | Linear Technology

LTC1645 Dual-Channel Hot Swap Controller/Power Sequencer Features s s s s DESCRIPTIO s s s s s Allows Safe Board Insertion and Removal from a Live Backplane Programmable Power Supply Sequencing Programmable Electronic Circuit Breaker User-Programmable Supply Voltage Power-Up and Power-Down Rate High Side Drivers for External N-Channel FETs Controls Supply Voltages from 1.2V to 12V Ensures Proper Power-Up Behavior Undervoltage Lockout Glitch Filter Protects Against Spurious RESET Signals U APPLICATIO S s s s Hot Board Insertion Power Supply Sequencing Electronic Circuit Breaker The LTC®1645 is a 2-channel Hot Swap TM controller that allows a board to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, the supply voltages can be ramped at a programmable rate. Two high side switch drivers control the N-channel gates for supply voltages ranging from 1.2V to 12V. The two channels can be set to ramp up and down separately, or they can be programmed to rise and fall simultaneously, ensuring power supply tracking at the two outputs. Programmable electronic circuit breakers protect against shorts at either output. The RESET output can be used to generate a system reset when a supply voltage falls below a user-programmed voltage. An additional spare parator is available for monitoring a second supply voltage. The LTC1645 is available in the 8- and 14-pin SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO VIN2 5V and 3.3V Hot Swap 0.005Ω- IRF7413 5V and 3.3V Hot Swap Waveforms + VOUT2 3.3V 5A CLOAD2 VOUT1 5V 5A CLOAD1 0.005Ω- VIN1 IRF7413 ON 5V/DIV + 10Ω 10Ω 0.01µF 25V 7 8 5 10k GND 4 1645 TA01 GATEn 10V/DIV CONNECTOR 2 CONNECTOR 1 0.01µF 25V 1 2 3 VOUT2 5V/DIV SENSE1 GATE1 VCC1 ON VCC2 SENSE2 GATE2 LTC1645 (8-LEAD) VOUT1 5V/DIV GND BACKPLANE PLUG-IN...