LT4256-2 Positive High Voltage Hot Swap Controllers

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

Allows Safe Board Insertion and Removal from a Live Backplane

Controls Supply Voltage from 10.8V to 80V

Foldback Current Limiting

Overcurrent Fault Detection

Drives an External N-Channel MOSFET

Programmable Supply Voltage Power-Up Rate

Undervoltage Protection

Latch Off Operation Mode (LT4256-1)

Automatic Retry (LT4256-2)

Available in an 8-Pin SO Package

参数

应用

Hot Board Insertion

Electronic Circuit Breaker/Power Bussing

Industrial High Side Switch/Circuit Breaker

24V/48V Industrial/Alarm Systems

Ideally Suited for 12V, 24V and 48V Distributed Power Systems

48V Telecom Systems

典型应用图

LT4256-2 订购信息和价格参考Package Variations and Pricing

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

LT4256-2 数据手册及相关资料下载

数据手册(英文) : LT4256-1/LT4256-2 - Positive High Voltage Hot Swap Controllers.PDF
可靠性数据 : R568 Reliability Data .PDF
产品选型卡 : High Voltage Hot Swap Controllers.PDF