ADP165/ADP166

Data Sheet

To minimize quiescent current in the ADP165/ADP166, 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. However, note that a 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 ADP165 also includes 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 ADP166 does not include the

output discharge function.

The ADP165/ADP166 are available in seven output voltage

options, ranging from 1.2 V to 3.3 V. The ADP165/ADP166 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, tie EN

to VIN.

Rev. A | Page 14 of 23