Datasheet

Data Sheet ADP160/ADP161/ADP162/ADP163
Rev. H | Page 13 of 24
To minimize quiescent current in the ADP161 and ADP163
Analog Devices, Inc., recommends using high values of
resistance for R1 and R2. Using a value of 1 MΩ for R2 keeps
the total, no load quiescent current below 2 µA. Note however,
that high value of resistance introduces a small output voltage
error. For example, assuming R1 and R2 are 1 MΩ, the output
voltage is 2 V. Taking into account the nominal ADJ pin bias
current of 10 nA, the output voltage error is 0.25%.
Note that in shutdown, the output is turned off and the divider
current is zero.
The ADP160/ADP161 also include an output discharge resistor to
force the output voltage to zero when the LDO is disabled. This
ensures that the output of the LDO is always in a well-defined state,
whether it is enabled or not. The ADP162/ADP163 do not
include the output discharge function.
The ADP160/ADP162 are available in 15 output voltage options,
ranging from 1.2 V to 4.2 V. The ADP16x use the EN pin to enable
and disable the VOUT pin under normal operating conditions.
When EN is high, VOUT turns on, and when EN is low, VOUT
turns off. For automatic startup, EN can be tied to VIN.