LTC4213 datasheet(7/22 Pages) AD

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LTC4213

Rev. A

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PIN FUNCTIONS

Exposed Pad (Pin 9, DDB Package Only): Exposed pad

may be left open or connected to device ground.

GATE (Pin 5/Pin 8): GATE Drive Output. An internal charge

pump supplies 100µA pull-up current to the gate of the

external N-channel MOSFET. Internal circuitry limits the

voltage between the GATE and SENSEN pins to a safe gate

drive voltage of less than 8V. When the circuit breaker

trips, the GATE pin abruptly pulls to GND.

GND (Pin 4/Pin 1): Device Ground.

ISEL (Pin 3/Pin 2): Threshold Select Input. With the

ISEL pin grounded, float or tied to VCC the VCB is set to

25mV, 50mV or 100mV, respectively. The corresponding

VCB(FAST) values are 100mV, 175mV and 325mV.

ON (Pin 2/Pin 3): ON Control Input. The LTC4213 is in

reset mode when the ON pin is below 0.4V. When the ON

pin increases above 0.8V, the device starts up and the

GATE pulls up with a 100µA current source. When the

ON pin drops below 0.76V, the GATE pulls down. To reset

a circuit breaker fault, the ON pin must go below 0.4V.

READY (Pin 1/Pin 4): READY Status Output. Open-drain

output that goes high impedance when the external

MOSFET is on and the circuit breaker is armed. Otherwise

this pin pulls low.

SENSEN (Pin 6/Pin 7): Circuit Breaker Negative Sense

Input. Connect this pin to the source of the external

MOSFET. During reset or fault mode, the SENSEN pin

discharges the output to ground with 280µA.

SENSEP (Pin 7/Pin 6): Circuit Breaker Positive Sense

Input. Connect this pin to the drain of external N-channel

MOSFET. The circuit breaker trips when the voltage across

SENSEP and SENSEN exceeds VCB. The input common

mode range of the circuit breaker is from ground to VCC +

0.2V when VCC < 2.5V. For VCC ≥ 2.5V, the input common

mode range is from ground to VCC + 0.4V.

VCC (Pin 8/Pin 5): Bias Supply Voltage Input. Normal

operation is between 2.3V and 6V. An internal under-volt-

age lockout circuit disables the device when VCC < 2.07V.

(DFN/TSOT-23)

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