LTC4368

1

Rev. B

For more information www.analog.com

TYPICAL APPLICATION

FEATURES

DESCRIPTION

100V UV/OV and Reverse Protection

Controller with Bidirectional Circuit Breaker

24V Application with 10A Circuit Breaker

APPLICATIONS

n

Wide Operating Voltage Range: 2.5V to 60V

n

Overvoltage Protection to 100V

n

Reverse Supply Protection to –40V

n

Bidirectional Electronic Circuit Breaker:

n

+50mV Forward Sense Threshold

n

–50mV Reverse (LTC4368-1)

n

–3mV Reverse (LTC4368-2)

n

Adjustable ±1.5% Undervoltage and Overvoltage

Thresholds

n

Low Operating Current: 80µA

n

Low Shutdown Current: 5µA

n

Controls Back-to-Back N-Channel MOSFETs

n

Blocks 50Hz and 60Hz AC Power

n

Hot Swappable Supply Input

n

Pin-Selectable Overcurrent Auto-Retry Timer or Latchoff

n

10-Pin MSOP and 3mm × 3mm DFN Packages

n

AEC-Q100 Qualified for Automotive Applications

n

Reverse Battery Protection

n

Portable Instrumentation

n

Automotive and Industrial Surge Protection

n

Energy Storage Systems

The LTC®4368 protects applications from power supply

voltages that may be too high, too low, or even negative

and from overcurrent faults in both forward and reverse

directions. The LTC4368 controls the gate voltage of a pair

of external N-channel MOSFETs to ensure that the load

is connected to the input supply only when there are no

voltage or current faults.

Two comparator inputs allow configuration of the over-

voltage (OV) and undervoltage (UV) set points using an

external resistive divider. A current sense resistor sets the

forward and reverse circuit breaker current thresholds.

After a forward current fault, the LTC4368 will either latch-

off power, or retry after a user adjustable delay. After a

reverse current fault, the LTC4368 waits for the output to

fall 100mV below the input to reconnect power to the load.

The LTC4368 has a 32ms turn-on delay that debounces

live supply input connections and blocks 50Hz and 60Hz

AC power. UV/OV faults also trigger the 32ms recovery

delay before the external MOSFETs are turned back on.

VALID WINDOW

OV = 36V

UV = 7V

200ms/DIV

–40V

20V/DIV

GND

4368 TA01b

+70V

20V/DIV

+

+50mV

–3mV

UV

OV

RETRY

SHDN

4368 TA01a

FAULT

GATE

24V

100µF

7V TO 36V

SiR870

SiR870

GND

LTC4368-2

464k

1500k

121k

29.4k

3.3nF

1200ms COOLDOWN

AFTER FORWARD

OC FAULT

0.005

–40V TO 100V

INRUSH

CONTROL

22k

0.22µF

OV = 36V

UV = 7V

–0.6A TO 10A

SENSE

Document Feedback

All registered trademarks and trademarks are the property of their respective owners.