MIC5233_09 Datasheet, PDF (8/9 Pages) Micrel Semiconductor – High Input Voltage Low IQ μCap LDO Regulator

Micrel, Inc.
Assuming a lower output current of 10mA, the maximum
input voltage can be recalculated:
319mW = (V_IN – 3V)10mA + V_IN × 0.1mA
349mW = V_IN × 10.1mA
V_IN = 34.9V
Maximum input voltage for a 10mA load current at 50°C
ambient temperature is 34.9V, utilizing virtually the entire
operating voltage range of the device.
Adjustable Regulator Application
The MIC5233BM5 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:
MIC5233
V_OUT
=
V_REF
⎜⎜⎝⎛¹
+
⎜⎜⎝⎛
R₁
R₂
⎟⎟⎠⎞
⎟⎞
⎟⎠
Where V_REF = 1.24V.
Feedback resistor R2 should be no larger than 300kΩ.
MIC5233BM5
V_IN
IN
OUT
V_OUT
1.0µF
EN
ADJ.
GND
R₁
2.2µF
R₂
Figure 1. Adjustable Voltage Application
September 2009
8
M9999-092109