LTC4249

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

65V Dual Electronic Circuit

Breaker with Current Monitors

The LTC®4249 dual electronic circuit breaker (ECB) pro-

vides independent overcurrent protection to a pair of

loads. Each channel has a precision enable input, current

monitor output and ready status output. A single resistor

configures the ECB threshold. If either channel detects an

overcurrent condition, the corresponding breaker discon-

nects the input from the load.

After a circuit breaker event, the open-drain RDY status

output pulls low and the ECB latches off. Toggling the

enable input turns the ECB back on after a 1 second cool-

off period. The cool-off timer, overtemperature sensor,

short-circuit detector and inrush controller prevent opera-

tion outside the safe operating area of the circuit breakers.

Precision enable inputs, ready outputs and analog current

monitor outputs permit voltage sequencing and closed

loop bias current control applications. ECB channels may

be paralleled as needed. Load isolation and reverse cur-

rent detection applications are also possible.

Bias Sequenced GaN PA 1A Servo with 1.2A Protection

1A ON/OFF Servo Response

APPLICATIONS

n

High Voltage Dual SPST, Current Sharing Allowed

n

5% Accurate Analog Current Monitor Outputs

n

Adjustable Circuit Breaker Thresholds to 1.2A

n

Filtered (50µs) Primary OC Threshold

n

Fast (2µs) Secondary OC Threshold

n

75mΩ Integrated Switches

n

Automatic Inrush Control

n

Short-Circuit Protection

n

Precision Enable Inputs

n

Open-Drain, Ready Status Outputs

n

16-Lead 3mm × 3mm LQFN and 12-Lead (Skipped

Lead) 3mm × 4mm LQFN

n

5G mMIMO PA Array Protection

n

Industrial Safety

n

Condition Monitoring

n

Relay Replacement

n

Load Switching

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R3

4.7k

100k

330pF

100

R1

301k

R2

10k

10k

28V

10µF

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

SOME CONNECTIONS

OMITTED FOR CLARITY

5V

–5V

HMC1086

4249 TA01a

GaN PA

PA BIAS SETPOINT

SHDN

LTC6228

OUT

RFOUT

RFIN

DAC

200µs/DIV

4249 TA01b

DRIVE

2V/DIV

COMMAND

INPUT

1V/DIV

CURRENT

1A/DIV