Datasheet LTC4368 (Analog Devices)

LTC4368 100V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker
FEATURES DESCRIPTION
n
Wide Operating Voltage Range: 2.5V to 60V
The LTC®4368 protects applications from power supply n
Overvoltage Protection to 100V
voltages that may be too high, too low, or even negative n
Reverse Supply Protection to –40V
and from overcurrent faults in both forward and reverse n
Bidirectional Electronic Circuit Breaker:
directions. The LTC4368 controls the gate voltage of a pair n
+50mV Forward Sense Threshold
of external N-channel MOSFETs to ensure that the load n
–50mV Reverse (LTC4368-1)
is connected to the input supply only when there are no n
–3mV Reverse (LTC4368-2)
voltage or current faults. n Adjustable ±1.5% Undervoltage and Overvoltage Two comparator inputs allow configuration of the over- Thresholds voltage (OV) and undervoltage (UV) set points using an n Low Operating Current: 80µA external resistive divider. A current sense resistor sets the n Low Shutdown Current: 5µA forward and reverse circuit breaker current thresholds. n Controls Back-to-Back N-Channel MOSFETs After a forward current fault, the LTC4368 wil either latch- n Blocks 50Hz and 60Hz AC Power off power, or retry after a user adjustable delay. After a n Hot Swappable Supply Input reverse current fault, the LTC4368 waits for the output to n Pin-Selectable Overcurrent Auto-Retry Timer or Latchoff fall 100mV below the input to reconnect power to the load. n 10-Pin MSOP and 3mm × 3mm DFN Packages The LTC4368 has a 32ms turn-on delay that debounces
APPLICATIONS
live supply input connections and blocks 50Hz and 60Hz AC power. UV/OV faults also trigger the 32ms recovery n Reverse Battery Protection delay before the external MOSFETs are turned back on. n Portable Instrumentation All registered trademarks and trademarks are the property of their respective owners. n Automotive and Industrial Surge Protection n Energy Storage Systems
TYPICAL APPLICATION 24V Application with 10A Circuit Breaker Load Protected from Reverse and Overvoltage at VIN
+50mV VOUT –40V TO 100V SiR870 SiR870 0.005Ω 7V TO 36V OV = 36V VIN IOUT +70V 24V UV = 7V INRUSH + –0.6A TO 10A 20V/DIV VIN CONTROL –3mV 100µF 22k 3.3nF VALID WINDOW GATE SENSE VOUT VIN GND V V OUT OUT 464k SHDN FAULT 1500k –40V LTC4368-2 20V/DIV VIN UV 1200ms COOLDOWN OV = 36V 121k AFTER FORWARD UV = 7V OC FAULT OV RETRY 200ms/DIV 4368 TA01b 29.4k GND 0.22µF 4368 TA01a Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Pin Functions Block Diagram Applications Information Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts