STOD13A

Detailed description

Doc ID 022599 Rev 1

19/24

8.1.2

Enable pin

The device operates when the EN pin is set high. If the EN pin is set low, the device stops

switching, and all the internal blocks are turned off. In this condition the current drawn from

are in an OFF state so the load is electrically disconnected from the input, this avoids

unwanted current leakage from the input to the load.

8.1.3

Soft-start and inrush current limiting

switch implements a current limiting technique in order to keep the charge current below

voltage level, the P1B switch is fully turned on and the soft-start procedure for the step-up is

started.

After around 2 ms the soft-start for the inverting is started. The positive and negative

voltages are under regulation at around 6ms after the EN pin is asserted high.

8.1.4

Undervoltage lockout

The undervoltage lockout function avoids improper operation of the STOD13A when the

input voltage is not high enough. When the input voltage is below the UVLO threshold the

device is in shutdown mode. The hysteresis of 50 mV avoids unstable operation when the

input voltage is close to the UVLO threshold.

8.1.5

Overtemperature protection

An internal temperature sensor continuously monitors the IC junction temperature. If the IC

temperature exceeds 140 °C, typical, the device stops operating. As soon as the

temperature falls below 125 °C, typical, normal operation is restored.

8.1.6

Short-circuit protection

stages of the device are turned off. This status is maintained, avoiding current flowing to the

load. A new ENABLE transition is needed to restart the device. During startup the short-

circuit protection is active.

8.1.7

Fast discharge

When ENABLE turns from high to low level and the FD pin is low, the device goes into

voltage and negative output voltage. When the output voltages are discharged to 0 V, the

switches turn off and the outputs are high impedance. When the FD pin is high, the fast

discharge after shutdown is off.