LT4256-3 Positive High Voltage Hot Swap Controller with Open-Circuit Detect

The LT®4256-3 is a high voltage Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 80V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions.

The LT4256-3 also 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, the PWRGD output asserts low and the LT4256-3 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low (depending on the status of the RETRY pin).

The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage and overvoltage protection.

The LT4256-3 is available in a 16-lead SSOP package

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

Open Circuit and Overcurrent Fault Detect

Drives an External N-Channel MOSFET

Automatic Retry or Latched Off Operation After Overcurrent Fault

Programmable Supply Voltage Power-Up Rate

Open MOSFET Detection

1% Over and Undervoltage Detection Accuracy

Available in a 16-Lead SSOP 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

LT4256-3 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) *
LT4256-3CS8	SO	8	C	$2.50	$1.75
LT4256-3CS8#PBF	SO	8	C	$2.50	$1.75
LT4256-3CS8#TR	SO	8	C		$1.81
LT4256-3CS8#TRPBF	SO	8	C		$1.81
LT4256-3IS8	SO	8	I	$2.86	$2.00
LT4256-3IS8#PBF	SO	8	I	$2.86	$2.00
LT4256-3IS8#TR	SO	8	I		$2.06
LT4256-3IS8#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

LT4256-3 数据手册及相关资料下载

数据手册(英文) : LT4256-3 - Positive High Voltage Hot Swap Controller with Open-Circuit Detect.PDF
可靠性数据 : R568 Reliability Data .PDF
产品选型卡 : High Voltage Hot Swap Controllers.PDF