LTC4213 No R SENSE Electronic Circuit Breaker FEATURES DESCRIPTIO Fast 1s Response Circuit Breaker The LTC 4213 is an Electronic Circuit Breaker. An over- 3 Selectable Circuit Breaker Thresholds current circuit breaker senses the voltage across the drain No Sense Resistor Required and source terminals of an external N-channel MOSFET Dual Level Overcurrent Fault Protection with no need for a sense resistor. The advantages are a Controls Load Voltages from 0V to 6V lower cost and reduced voltage and power loss in the High Side Drive for External N-Channel FET switch path. An internal high-side driver controls the Undervoltage Lockout external MOSFET gate. READY Pin Signals When Circuit Breaker Armed Two integrated comparators provide dual level over- Small Plastic (3mm x 2mm) DFN Package current protection over the bias supply to ground common mode range. The slow comparator has 16s response U while the fast comparator trips in 1s. The circuit breaker APPLICATIO S has three selectable trip thresholds: 25mV, 50mV and Electronic Circuit Breaker 100mV. An ON pin controls the ON/OFF and resets circuit High-Side Switch breaker faults. READY signals the MOSFET is conducting Hot Board Insertion and the circuit breaker is armed. The LTC4213 operates from V = 2.3V to 6V. CC , LTC and LT are registered trademarks of Linear Technology Corporation. No R is a trademark of Linear Technology Corporation. All other trademarks are the SENSE property of their respective owners. TYPICAL APPLICATIO 1.25V Electronic Circuit Breaker Severe Overload Response SI4864DY V V IN OUT 1.25V 1.25V 3.5A I OUT (50A/DIV) SENSEP GATE SENSEN V BIAS V CC V 2.3V TO 6V BIAS V OUT LTC4213 (1V/DIV) 10k OFF ON ON READY GND I SEL V GATE (5V/DIV) 4213 TA01 V IN 4213 TA01b (1V/DIV) 2s/DIV 4213f 1 U ULTC4213 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART TOP VIEW Bias Supply Voltage (V ) ........................... 0.3V to 9V CC NUMBER Input Voltages READY 1 8 V CC ON, SENSEP, SENSEN.............................0.3V to 9V LTC4213CDDB ON 2 7 SENSEP 9 I .......................................... 0.3V to (V + 0.3V) LTC4213IDDB SEL CC I 3 6 SENSEN SEL Output Voltages GND 4 5 GATE DDB PART* GATE .....................................................0.3V to 15V DDB PACKAGE MARKING READY.....................................................0.3V to 9V 8-LEAD (3mm 2mm) PLASTIC DFN Operating Temperature Range T = 125C, = 250C/W JMAX JA LBHV EXPOSED PAD (PIN 9) LTC4213C ............................................... 0C to 70C PCB CONNECTION OPTIONAL LTC4213I............................................. 40C to 85C Storage Temperature Range ................. 65C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Lead Temperature (Soldering, 10sec)................... 300C ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 5V, I = 0 unless otherwise noted. (Note 2) A CC SEL SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Bias Supply Voltage 2.3 6 V CC V SENSEP Voltage 06 V SENSEP I V Supply Current 1.6 3 mA CC CC V V Undervoltage Lockout Release V Rising 1.8 2.07 2.23 V CC(UVLR) CC CC V V Undervoltage Lockout Hysteresis 30 100 160 mV CC(UVHYST) CC I SENSEP Input Current V = V = 5V, Normal Mode 15 40 80 A SENSEP SENSEP SENSEN V = V = 0, Normal Mode 1 15 A SENSEP SENSEN I SENSEN Input Current V = V = 5V, Normal Mode 15 40 80 A SENSEN SENSEP SENSEN V = V = 0, Normal Mode 1 15 A SENSEP SENSEN V = V = 5V, 50 280 A SENSEP SENSEN Reset Mode or Fault Mode V Circuit Breaker Trip Voltage I = 0, V = V 22.5 25 27.5 mV CB SEL SENSEP CC V = V V I = Floated, V = V 45 50 55 mV CB SENSEP SENSEN SEL SENSEP CC I = V V = V 90 100 110 mV SEL CC, SENSEP CC V Fast Circuit Breaker Trip Voltage I = 0, V = V 63 100 115 mV CB(FAST) SEL SENSEP CC V = V V I = Floated, V = V 126 175 200 mV CB(FAST) SENSEP SENSEN SEL SENSEP CC I = V V = V 252 325 371 mV SEL CC, SENSEP CC I GATE Pin Pull Up Current V = 0V 50 100 150 A GATE(UP) GATE I GATE Pin Pull Down Current V V = 200mV, V = 8V 10 40 mA GATE(DN) SENSEP SENSEN GATE V External N-Channel Gate Drive V = 0, V 2.97V, I = 1A 4.8 6.5 8 V GSMAX SENSEN CC GATE V = 0, V = 2.3V, I = 1A 2.65 4.3 8 V SENSEN CC GATE V V Voltage to Arm Circuit Breaker V = 0, V 2.97V 4.4 5.4 7.6 V GSARM GS SENSEN CC V = 0, V = 2.3V 2.5 3.5 7 V SENSEN CC 4213f 2 U WWW