LT3073AVPBF datasheet(11/37 Pages) AD

11 / 37 page

Data Sheet

LT3073

analog.com

Rev 0.

11 of 37

IMON

Output Current Monitor. The IMON pin sources a current typically equal to IOUT/3000.

Terminating this pin with a resistor to GND produces a voltage proportional to IOUT. For

example, at IOUT = 3A, IMON typically sources 1mA. 0.8V is produced with a 0.8kΩ

resistor to GND. The IMON pin can also be used to set the programmable current limit.

IMON pin’s current limit threshold is 1V.

BIASF

Bias Filter Pin. The LT3073 requires a minimum 2.2µF bypass capacitor on this pin.

BIAS

Bias Supply. This pin supplies current to the internal control circuitry and the output

stage, driving the pass transistor. This pin doesn’t require any bypass capacitor. To

ensure proper operation, the BIAS voltage must satisfy the following conditions:

2.375V ≤ VBIAS ≤ 5.5V and VBIAS ≥ 1.2 + VOUT.

TEMP

Output indicator of average die temperature scaled at 10mV/°C to a reference level of

0.25V at 25°C. The TEMP output is active when the part is enabled.

20, 21,

22,

Exposed

Pad 23

Input Supply. Pins 20-22 and exposed pad 23 of the LQFN package are the electrical

connection to IN. These pins supply power to the high-current pass transistor. Connect

all IN pins for proper performance and solder Pin 23 to the PCB for better thermal

performance. The LT3073 requires a bypass capacitor at IN to maintain stability and

low input impedance over frequency. A 10µF input bypass capacitor suffices for most

battery and power plane impedances. Minimizing input trace inductance optimizes

performance. Applications with low VIN-VOUT differential voltage and large, fast load

transients may require much higher input capacitor to prevent the input supply from

drooping and allow the regulator to enter dropout.

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