ADP2102(Rev0) データシートの表示（PDF） - Analog Devices
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ADP2102 Datasheet PDF : 7 Pages
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ADP2102
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
Preliminary Technical Data
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.
Rev. PrA| Page 6 of 7
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