LM2736

SNVS316H – SEPTEMBER 2004 – REVISED DECEMBER 2014

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7.4 Device Functional Modes

7.4.1 Enable Pin / Shutdown Mode

The LM2736 device has a shutdown mode that is controlled by the enable pin (EN). When a logic low voltage is

applied to EN, the part is in shutdown mode and its quiescent current drops to typically 30 nA. Switch leakage

adds another 40 nA from the input supply. The voltage at this pin should never exceed VIN + 0.3 V.

7.4.2 Soft-Start

This function forces VOUT to increase at a controlled rate during start up. During soft-start, the error amplifier’s

reference voltage ramps from 0 V to its nominal value of 1.25 V in approximately 200 µs. This forces the

regulator output to ramp up in a more linear and controlled fashion, which helps reduce inrush current.

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