Datasheet LT4356-1, LT4356-2 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Surge Stopper |
| Pages / Page | 26 / 1 — FEATURES. DESCRIPTION. Stops High Voltage Surges. Adjustable Output Clamp … |
| Revision | C |
| File Format / Size | PDF / 480 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Stops High Voltage Surges. Adjustable Output Clamp Voltage. Overcurrent Protection
Model Line for this Datasheet
- LT4356CDE-1#PBF LT4356CDE-1#TRPBF LT4356CDE-2#PBF LT4356CDE-2#TRPBF LT4356CMS-1#PBF LT4356CMS-1#TRPBF LT4356CS-1#PBF LT4356CS-1#TRPBF LT4356CS-2#PBF LT4356CS-2#TRPBF LT4356HDE-1#PBF LT4356HDE-1#TRPBF LT4356HDE-2#PBF LT4356HDE-2#TRPBF LT4356HMS-1#PBF LT4356HMS-1#TRPBF LT4356HS-1#PBF LT4356HS-1#TRPBF LT4356HS-2#PBF LT4356HS-2#TRPBF LT4356IDE-1#PBF LT4356IDE-1#TRPBF LT4356IDE-2#PBF LT4356IDE-2#TRPBF LT4356IMS-1#PBF LT4356IMS-1#TRPBF LT4356IS-1#PBF LT4356IS-1#TRPBF LT4356IS-2#PBF LT4356IS-2#TRPBF
Text Version of Document
LT4356-1/LT4356-2 Surge Stopper
FEATURES DESCRIPTION
n
Stops High Voltage Surges
The LT®4356 surge stopper protects loads from high voltage n
Adjustable Output Clamp Voltage
transients. It regulates the output during an overvoltage n
Overcurrent Protection
event, such as load dump in automobiles, by controlling n
Wide Operation Range: 4V to 80V
the gate of an external N-channel MOSFET. The output is n
Reverse Input Protection to –60V
limited to a safe value thereby allowing the loads to con- n Low 7µA Shutdown Current (LT4356-1) tinue functioning. The LT4356 also monitors the voltage n Auxiliary Amplifier for Level Detection Comparator drop between the VCC and SNS pins to protect against or Linear Regulator Controller (LT4356-2) overcurrent faults. An internal amplifier limits the current n Adjustable Fault Timer sense voltage to 50mV. In either fault condition, a timer n Controls N-channel MOSFET is started inversely proportional to MOSFET stress. If the n Shutdown Pin Withstands –60V to 100V timer expires, the FLT pin pulls low to warn of an impend- n Fault Output Indication ing power down. If the condition persists, the MOSFET is n Guaranteed Operation to 125°C turned off. After a cool down period, the GATE pin pulls n Available in (4mm × 3mm) 12-Pin DFN, up turning on the MOSFET again. 10-Pin MSOP or 16-Pin SO Packages The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an
APPLICATIONS
external PNP pass transistor. n Automotive/Avionic Surge Protection Back-to-back FETs can be used in lieu of a Schottky diode n Hot Swap/Live Insertion for reverse input protection, reducing voltage drop and n High Side Switch for Battery Powered Systems power loss. A shutdown pin reduces the quiescent current n Intrinsic Safety Applications to less than 7µA for the LT4356-1 during shutdown. The All registered trademarks and trademarks are the property of their respective owners. Protected LT4356-2 differs from the LT4356-1 during shutdown by by U.S. patents, including XXXXX, XXXXX. reducing the quiescent current to 60µA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator.
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 V V IN CC SNS GATE OUT 383k 20V/DIV FB SHDN VCC 4.99k 12V IN+ LT4356DE DC-DC 27V ADJUSTABLE CLAMP CONVERTER VOUT 100k 20V/DIV EN SHDN GND 12V UNDERVOLTAGE AOUT GND TMR FLT FAULT 100ms/DIV 4356 TA01b 4356 TA01 0.1µF Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features 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 surge stopper protects loads from high voltage n
Adjustable Output Clamp Voltage
transients. It regulates the output during an overvoltage n
Overcurrent Protection
event, such as load dump in automobiles, by controlling n
Wide Operation Range: 4V to 80V
the gate of an external N-channel MOSFET. The output is n
Reverse Input Protection to –60V
limited to a safe value thereby allowing the loads to con- n Low 7µA Shutdown Current (LT4356-1) tinue functioning. The LT4356 also monitors the voltage n Auxiliary Amplifier for Level Detection Comparator drop between the VCC and SNS pins to protect against or Linear Regulator Controller (LT4356-2) overcurrent faults. An internal amplifier limits the current n Adjustable Fault Timer sense voltage to 50mV. In either fault condition, a timer n Controls N-channel MOSFET is started inversely proportional to MOSFET stress. If the n Shutdown Pin Withstands –60V to 100V timer expires, the FLT pin pulls low to warn of an impend- n Fault Output Indication ing power down. If the condition persists, the MOSFET is n Guaranteed Operation to 125°C turned off. After a cool down period, the GATE pin pulls n Available in (4mm × 3mm) 12-Pin DFN, up turning on the MOSFET again. 10-Pin MSOP or 16-Pin SO Packages The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an
APPLICATIONS
external PNP pass transistor. n Automotive/Avionic Surge Protection Back-to-back FETs can be used in lieu of a Schottky diode n Hot Swap/Live Insertion for reverse input protection, reducing voltage drop and n High Side Switch for Battery Powered Systems power loss. A shutdown pin reduces the quiescent current n Intrinsic Safety Applications to less than 7µA for the LT4356-1 during shutdown. The All registered trademarks and trademarks are the property of their respective owners. Protected LT4356-2 differs from the LT4356-1 during shutdown by by U.S. patents, including XXXXX, XXXXX. reducing the quiescent current to 60µA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator.
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 V V IN CC SNS GATE OUT 383k 20V/DIV FB SHDN VCC 4.99k 12V IN+ LT4356DE DC-DC 27V ADJUSTABLE CLAMP CONVERTER VOUT 100k 20V/DIV EN SHDN GND 12V UNDERVOLTAGE AOUT GND TMR FLT FAULT 100ms/DIV 4356 TA01b 4356 TA01 0.1µF Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features 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
