MIC5235_09 Datasheet, PDF (8/9 Pages) Micrel Semiconductor – Ultra-Low Quiescent Current, 150mA μCap LDO Regulator

Micrel, Inc.
319mW = (V_IN – 3V)20mA + V_IN x 0.2mA
379mW = V_IN x 20.2mA
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:
V_OUT
=
V_REF
⎜⎜⎝⎛^{1 +}
⎜⎜⎝⎛
R₁
R₂
⎟⎟⎠⎞
⎟⎞
⎟⎠
MIC5235
Where V_REF = 1.24V.
Feedback resistor R2 should be no larger than 300kΩ.
V_IN
1.0µF
MIC5235BM5
IN
OUT
EN
ADJ.
GND
V_OUT
R₁
2.2µF
R₂
Figure 1. Adjustable Voltage Application
May 2008
8
M9999-051508