LTC4249 65V Dual Electronic Circuit Breaker with Current Monitors FEATURES DESCRIPTION n High Voltage Dual SPST, Current Sharing Allowed The LTC 4249 dual electronic circuit breaker (ECB) pro- n 5% Accurate Analog Current Monitor Outputs vides independent overcurrent protection to a pair of n Adjustable Circuit Breaker Thresholds to 1.2A loads. Each channel has a precision enable input, current n Filtered (50s) Primary OC Threshold monitor output and ready status output. A single resistor n Fast (2s) Secondary OC Threshold configures the ECB threshold. If either channel detects an n 75m Integrated Switches overcurrent condition, the corresponding breaker discon- n Automatic Inrush Control nects the input from the load. n Short-Circuit Protection After a circuit breaker event, the open-drain RDY status n Precision Enable Inputs output pulls low and the ECB latches off. Toggling the n Open-Drain, Ready Status Outputs enable input turns the ECB back on after a 1 second cool- n 16-Lead 3mm 3mm LQFN and 12-Lead (Skipped off period. The cool-off timer, overtemperature sensor, Lead) 3mm 4mm LQFN short-circuit detector and inrush controller prevent opera- tion outside the safe operating area of the circuit breakers. APPLICATIONS Precision enable inputs, ready outputs and analog current n 5G mMIMO PA Array Protection monitor outputs permit voltage sequencing and closed n Industrial Safety loop bias current control applications. ECB channels may n Condition Monitoring be paralleled as needed. Load isolation and reverse cur- n Relay Replacement rent detection applications are also possible. n Load Switching All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Bias Sequenced GaN PA 1A Servo with 1.2A Protection IN1 OUT1 28V 1A ON/OFF Servo Response C R1 OUT 10F 301k GaN PA V EN1 RDY1 DD COMMAND R2 INPUT LTC4249 R3 RFIN RFOUT 10k 1V/DIV 4.7k IMON1 V HMC1086 GG C R PA V f m GG 5V 330pF 10k DRIVE 2V/DIV SOME CONNECTIONS PA V OMITTED FOR CLARITY R DD g + CURRENT 100 V LTC6228 1A/DIV SHDN OUT 4249 TA01b 200s/DIV + PA BIAS SETPOINT DAC V R OFF 100k 5V 4249 TA01a Rev. 0 1 Document Feedback For more information www.analog.comLTC4249 (Notes 1, 2, 3, 4) ABSOLUTE MAXIMUM RATINGS Input Voltages Input Currents IN1, IN2 .................................................. 0.3V to 72V IN1, IN2 ...................................................................3A EN1, EN2 (Note 5) ................................. 0.3V to 5.5V Output Currents Output Voltages OUT1, OUT2 ..........................................................3A OUT1, OUT2 ........................................... 0.3V to 72V RDY1, RDY2 ......................................................10mA RDY1, RDY2 .......................................... 0.3V to 5.5V IMON1, IMON2...................................................1mA IMON1, IMON2...................................... 0.3V to 2.7V Operating Junction Temperature Range INTV .................................................. 0.3V to 5.5V LTC4249A .......................................... 40C to 125C CC Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW 20 17 16 15 14 13 EN1 2 15 RDY1 EN1 1 12 RDY1 IMON1 3 14 INTV CC 21 IMON1 2 11 INTV CC 17 GND GND IMON2 4 13 GND IMON2 3 10 GND EN2 5 12 RDY2 EN2 4 9 RDY2 5 6 7 8 7 10 LQFN PACKAGE 16-LEAD (3mm 3mm 0.95mm) LQFN PACKAGE = 10C/W, = 40C/W 20(12)-LEAD (3mm 4mm 0.95mm) JC JA EXPOSED PAD (PIN 17) IS GND, CONNECT TO PCB THERMAL PLANE = 10C/W, = 40C/W JC JA EXPOSED PAD (PIN 21) IS GND, CONNECT TO PCB THERMAL PLANE. INCREASED SPACING TO IN AND OUT FOR HIGH VOLTAGE CLEARANCE ORDER INFORMATION TRAY PART MARKING PACKAGE DESCRIPTION FAULT RESPONSE TEMPERATURE RANGE LTC4249AV-1 PBF LHMZ 16-Lead (3mm 3mm 0.95mm) LQFN Package Latch Off 40C to 125C LTC4249AV2-1 PBF 4249 20(12)-Lead (3mm 4mm 0.95mm) LQFN Package Latch Off 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. Rev. 0 2 For more information www.analog.com IN2 IN1 IN2 IN1 OUT2 OUT1 OUT2 OUT1 IN2 IN1 OUT2 OUT1