ADP2102

Preliminary Technical Data

Rev. PrA| Page 6 of 7

or otherwise, the ADP2102 operates in frequency fold back by

increasing the OFF time enough to keep the output current

fixed. Therefore, during this fault condition the ADP2102 acts

as a constant current source at the current limit of 1A typical.

SOFT START

The ADP2102 has in internal soft start function that ramps the

output voltage in a controlled manner upon startup by limiting

the inrush current. This prevents possible input voltage drops

when a battery or a high impedance power source is connected

to the input of the converter.

ENABLE

The device starts operation with soft start when the EN pin is

brought high. Pulling the EN pin low forces the device into

shutdown, with a typical shutdown current of 0.1μa. In this

mode both the High Side and Low Side Power Switches are

turned off, the internal resistor feedback divider is disconnected

and the entire control circuitry is switched off. For proper

operation, the EN pin must be terminated and must not be left

floating.

UNDER VOLTAGE LOCK OUT

The under voltage lockout circuit prevents the device from

operating incorrectly at low input voltages. It prevents the

converter from turning on the main switch and the

synchronous switch under undefined conditions and therefore

preventing deep discharge of the battery supply

THERMAL SHUTDOWN

When the Junction Temperature, Tj, exceeds typically 150 °C,

the device goes into Thermal Shutdown. In this mode, the High

Side and Low Side Power Switches are turned off. The device

continues its operation when the junction temperature when

the junction temperature falls below typically 135 °C again.