LM3242

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SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015

7.4.5 Shutdown Mode

Setting the EN digital pin low (< 0.4 V) places the LM3242 in Shutdown mode (0.1 µA typical). During shutdown,

the PFET switch, the NFET synchronous rectifier, reference voltage source, control and bias circuitry of the

LM3242 are turned off. Setting EN high (> 1.2 V) enables normal operation. EN must be set low to turn off the

LM3242 during power-up and undervoltage conditions when the power supply is less than the 2.7V minimum

operating voltage. The LM3242 has an undervoltage lock-out (UVLO) comparator to turn the power device off in

the case the input voltage or battery voltage is too low. The typical UVLO threshold is around 2 V for lock and 2.1

V for release.

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