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LT1641-2 Datasheet(PDF) 1 Page - Linear Technology |
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LT1641-2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1641-1/LT1641-2 164112fc Positive High Voltage Hot Swap Controllers The LT ®1641-1/LT1641-2 are 8-pin Hot SwapTM control- lers that allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped up at a programmable rate. A high side switch driver controls an N-channel gate for supply voltages ranging from 9V to 80V. The chips feature a programmable analog foldback cur- rent limit circuit. If the chips remain in current limit for more than a programmable time, the N-channel pass transistor is either latched off (LT1641-1) or is set to automatically restart after a time-out delay (LT1641-2). The PWRGD output indicates when the output voltage, sensed by the FB pin, is within tolerance. The ON pin provides programmable undervoltage lockout. The LT1641-1/LT1641-2 are available in the 8-lead SO package. ■ Hot Board Insertion ■ Electronic Circuit Breaker ■ Industrial High Side Switch/Circuit Breaker ■ 24V/48V Industrial/Alarm Systems ■ Allows Safe Board Insertion and Removal from a Live Backplane ■ Controls Supply Voltage from 9V to 80V ■ Programmable Analog Foldback Current Limiting ■ High Side Drive for an External N-Channel ■ Latched Operation Mode (LT1641-1) ■ Automatic Retry (LT1641-2) ■ User Programmable Supply Voltage Power-Up Rate ■ Undervoltage Lockout ■ Overvoltage Protection ■ Both are available in 8-Lead SO Package *SMAT70A *DIODES, INC. VIN 24V SHORT PIN GND VCC TIMER SENSE GATE D1 CMPZ 5248B GND PWRGD PWRGD FB R5 10 Ω 5% ON R1 49.9k 1% 1641-1 TA01 R2 3.4k 1% C2 0.68 µF R6, 1k, 5% RS 0.01 Ω C1 10nF R3 59k 1% R4 3.57k 1% R7 24k 5% CL VOUT LT1641-1/LT1641-2 Q1 IRF530 24V Input Voltage Application APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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