The LT®4256-1/LT4256-2 are high voltage Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. An internal driver drives an external N-channel MOSFET switch to control supply voltages ranging from 10.8V to 80V.
The LT4256-1/LT4256-2 features an adjustable analog foldback current limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off and the PWRGD output asserts low. The LT4256-2 automatically restarts after a time-out delay. The LT4256-1 latches off until the UV pin is cycled low.
The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage protection.
The LT4256 can be used as an upgrade to LT1641 designs. See Table 1 on page 14 for upgraded specifications.
The LT4256-1 and LT4256-2 are available in an 8-pin SO package that is pin compatible with the LT1641.
产品特点 Features
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应用
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器件型号 | 封装 | 引脚 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
LT4256-1CS8 | SO | 8 | C | $2.50 | $1.75 |
LT4256-1CS8#PBF | SO | 8 | C | $2.50 | $1.75 |
LT4256-1CS8#TR | SO | 8 | C | $1.81 | |
LT4256-1CS8#TRPBF | SO | 8 | C | $1.81 | |
LT4256-1IS8 | SO | 8 | I | $2.86 | $2.00 |
LT4256-1IS8#PBF | SO | 8 | I | $2.86 | $2.00 |
LT4256-1IS8#TR | SO | 8 | I | $2.06 | |
LT4256-1IS8#TRPBF | SO | 8 | I | $2.06 | |
LT4256-2CS8 | SO | 8 | C | $2.50 | $1.75 |
LT4256-2CS8#PBF | SO | 8 | C | $2.50 | $1.75 |
LT4256-2CS8#TR | SO | 8 | C | $1.81 | |
LT4256-2CS8#TRPBF | SO | 8 | C | $1.81 | |
LT4256-2IS8 | SO | 8 | I | $2.86 | $2.00 |
LT4256-2IS8#PBF | SO | 8 | I | $2.86 | $2.00 |
LT4256-2IS8#TR | SO | 8 | I | $2.06 | |
LT4256-2IS8#TRPBF | SO | 8 | I | $2.06 | |
LT4256-3CGN | SSOP | 16 | C | $2.95 | $2.10 |
LT4256-3CGN#PBF | SSOP | 16 | C | $2.95 | $2.10 |
LT4256-3CGN#TR | SSOP | 16 | C | $2.16 | |
LT4256-3CGN#TRPBF | SSOP | 16 | C | $2.16 | |
LT4256-3IGN | SSOP | 16 | I | $3.48 | $2.45 |
LT4256-3IGN#PBF | SSOP | 16 | I | $3.48 | $2.45 |
LT4256-3IGN#TR | SSOP | 16 | I | $2.51 | |
LT4256-3IGN#TRPBF | SSOP | 16 | I | $2.51 |