ADR130

Rev. 0 | Page 12 of 16

THEORY OF OPERATION

The ADR130 sub-band gap reference is the high performance

solution for low supply voltage and low power applications. The

uniqueness of this product lies in its architecture.

POWER DISSIPATION CONSIDERATIONS

The ADR130 is capable of delivering load currents to 4 mA

with an input range from 3.0 V to 18 V. When this device is

used in applications with large input voltages, care must be

taken to avoid exceeding the specified maximum power

dissipation or junction temperature, because this results in

premature device failure.

Use the following formula to calculate the maximum junction

temperature or dissipation:

JA

A

J

D

θ

T

T

P

−

=

where:

INPUT CAPACITOR

Input capacitors are not required on the ADR130. There is no

limit for the value of the capacitor used on the input, but a 1 μF

to 10 μF capacitor on the input improves transient response in

applications where there is a sudden supply change. An addi-

tional 0.1 μF capacitor in parallel also helps reduce noise from

the supply.

OUTPUT CAPACITOR

The ADR130 requires a small 0.1 μF output capacitor for

stability. Additional 0.1 μF to 10 μF capacitance in parallel can

improve load transient response. This acts as a source of stored

energy for a sudden increase in load current. The only parame-

ter affected by the additional capacitance is turn-on time.