Datasheet LT4356-3 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Surge Stopper with Fault Latchoff |
| Pages / Page | 24 / 1 — FEATURES. DESCRIPTION. Stops High Voltage Surges. Adjustable Output Clamp … |
| Revision | D |
| File Format / Size | PDF / 640 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Stops High Voltage Surges. Adjustable Output Clamp Voltage. Overcurrent Protection
Model Line for this Datasheet
- LT4356CDE-3#PBF LT4356CDE-3#TRPBF LT4356CMS-3#PBF LT4356CMS-3#TRPBF LT4356CS-3#PBF LT4356CS-3#TRPBF LT4356HDE-3#PBF LT4356HDE-3#TRPBF LT4356HMS-3#PBF LT4356HMS-3#TRPBF LT4356HS-3#PBF LT4356HS-3#TRPBF LT4356IDE-3#PBF LT4356IDE-3#TRPBF LT4356IMS-3#PBF LT4356IMS-3#TRPBF LT4356IS-3#PBF LT4356IS-3#TRPBF LT4356MPMS-3#PBF LT4356MPMS-3#TRPBF LT4356MPS-3#PBF LT4356MPS-3#TRPBF
Text Version of Document
LT4356-3 Surge Stopper with Fault Latchoff
FEATURES DESCRIPTION
n
Stops High Voltage Surges
The LT®4356-3 surge stopper protects loads from high n
Adjustable Output Clamp Voltage
voltage transients. It regulates the output during an n
Overcurrent Protection
overvoltage event, such as load dump in automobiles, by n
Wide Operation Range: 4V to 80V
controlling the gate of an external N-channel MOSFET. The n
Reverse Input Protection to –60V
output is limited to a safe value thereby allowing the loads n Low 7µA Shutdown Current to continue functioning. The LT4356-3 also monitors the n Adjustable Latchoff Fault Timer voltage drop between the VCC and SNS pins to protect n Controls N-channel MOSFET against overcurrent faults. An internal amplifier limits n Shutdown Pin Withstands –60V to 100V the current sense voltage to 50mV. In either fault condi- n Fault Output Indication tion, a timer is started inversely proportional to MOSFET n Auxiliary Amplifier for Level Detection Comparator or stress. If the timer expires, the FLT pin pulls low to warn Linear Regulator Controller of an impending power down. If the condition persists, n Available in 12-Pin 4mm × 3mm DFN, the MOSFET is turned off, until the SHDN pin pulls low 10-Pin MSOP, and 16-Pin SO Packages momentarily.
APPLICATIONS
The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an n external PNP pass transistor. Automotive/Avionic Surge Protection n Hot Swap/Live Insertion Back-to-back FETs can be used in lieu of a Schottky diode n High Side Switch for Battery Powered Systems for reverse input protection, reducing voltage drop and power loss. The SHDN input turns off the part, including All registered trademarks and trademarks are the property of their respective owners. the auxiliary amplifier, and reduces the quiescent current to less than 7µA.
TYPICAL APPLICATION 4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient
10mΩ IRLR2908 V V IN OUT 12V 80V INPUT SURGE CTMR = 6.8µF ILOAD = 500mA 10Ω 102k VIN VCC SNS GATE OUT 20V/DIV 383k FB SHDN VCC 4.99k 12V 27V ADJUSTABLE CLAMP IN+ LT4356DE-3 DC-DC CONVERTER VOUT 100k 20V/DIV EN SHDN 12V GND UNDERVOLTAGE AOUT GND TMR FLT FAULT 100ms/DIV LT4356-3TA01b 43563 TA01 0.1µF Rev D For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application .18702 Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related parts
FEATURES DESCRIPTION
n
Stops High Voltage Surges
The LT®4356-3 surge stopper protects loads from high n
Adjustable Output Clamp Voltage
voltage transients. It regulates the output during an n
Overcurrent Protection
overvoltage event, such as load dump in automobiles, by n
Wide Operation Range: 4V to 80V
controlling the gate of an external N-channel MOSFET. The n
Reverse Input Protection to –60V
output is limited to a safe value thereby allowing the loads n Low 7µA Shutdown Current to continue functioning. The LT4356-3 also monitors the n Adjustable Latchoff Fault Timer voltage drop between the VCC and SNS pins to protect n Controls N-channel MOSFET against overcurrent faults. An internal amplifier limits n Shutdown Pin Withstands –60V to 100V the current sense voltage to 50mV. In either fault condi- n Fault Output Indication tion, a timer is started inversely proportional to MOSFET n Auxiliary Amplifier for Level Detection Comparator or stress. If the timer expires, the FLT pin pulls low to warn Linear Regulator Controller of an impending power down. If the condition persists, n Available in 12-Pin 4mm × 3mm DFN, the MOSFET is turned off, until the SHDN pin pulls low 10-Pin MSOP, and 16-Pin SO Packages momentarily.
APPLICATIONS
The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an n external PNP pass transistor. Automotive/Avionic Surge Protection n Hot Swap/Live Insertion Back-to-back FETs can be used in lieu of a Schottky diode n High Side Switch for Battery Powered Systems for reverse input protection, reducing voltage drop and power loss. The SHDN input turns off the part, including All registered trademarks and trademarks are the property of their respective owners. the auxiliary amplifier, and reduces the quiescent current to less than 7µA.
TYPICAL APPLICATION 4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient
10mΩ IRLR2908 V V IN OUT 12V 80V INPUT SURGE CTMR = 6.8µF ILOAD = 500mA 10Ω 102k VIN VCC SNS GATE OUT 20V/DIV 383k FB SHDN VCC 4.99k 12V 27V ADJUSTABLE CLAMP IN+ LT4356DE-3 DC-DC CONVERTER VOUT 100k 20V/DIV EN SHDN 12V GND UNDERVOLTAGE AOUT GND TMR FLT FAULT 100ms/DIV LT4356-3TA01b 43563 TA01 0.1µF Rev D For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application .18702 Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related parts
