Datasheet

Micrel, Inc. MIC5235
May 2008 8
M9999-051508
Where V
REF
= 1.24V.
319mW = (V
IN
– 3V)20mA + V
IN
x 0.2mA
Feedback resistor R2 should be no larger than 300kΩ.
379mW = V
IN
x 20.2mA
OUT
ADJ.
V
IN
R
1
R
2
2.2µF
1.0µF
EN
IN
V
OUT
GND
MIC5235BM5
V
IN
= 18.8V
Maximum input voltage for a 20mA load current at 50°C
ambient temperature is 18.8V, utilizing virtually the entire
operating voltage range of the device.
Adjustable Regulator Application
The MIC5235BM5 can be adjusted from 1.24V to 20V by
using two external resistors (Figure 1). The resistors set
the output voltage based on the following equation:
Figure 1. Adjustable Voltage Application
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+=
2
1
REFOUT
R
R
1VV