MIC5205-2.5YM5 View Datasheet(PDF) - Micrel
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MIC5205-2.5YM5 Datasheet PDF : 10 Pages
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Micrel
VIN(max) = 6.23V
Therefore, a 3.3V application at 150mA of output current
can accept a maximum input voltage of 6.2V in a SOT-
23-5 package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
Regulator Thermals section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook.
Fixed Regulator Applications
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Figure 1 includes a 470pF capacitor for low-noise
operation and shows EN (pin 3) connected to IN (pin 1)
for an application where enable/shutdown is not
required. COUT = 2.2µF minimum.
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration
where CBYP is not required. COUT = 1µF minimum.
Adjustable Regulator Applications
The MIC5205BM5 can be adjusted to a specific output
voltage by using two external resistors (Figure 3). The
MIC5205
resistors set the output voltage based on the following
equation:
VOUT
= 1.242V
× ⎜⎛ R2 + 1⎟⎞
⎝ R1 ⎠
This equation is correct due to the configuration of the
bandgap reference. The bandgap voltage is relative to
the output, as seen in the block diagram. Traditional
regulators normally have the reference voltage relative
to ground and have a different VOUT equation.
Resistor values are not critical because ADJ (adjust) has
a high input impedance, but for best results use resistors
of 470kΩ or less. A capacitor from ADJ to ground
provides greatly improved noise performance.
Figure 3. Ultra-Low-Noise
Adjustable Voltage Application
Figure 3 includes the optional 470pF noise bypass
capacitor from ADJ to GND to reduce output noise.
Dual-Supply Operation
When used in dual supply systems where the regulator
load is returned to a negative supply, the output voltage
must be diode clamped to ground.
February 2006
9
M9999-020806
(408) 955-1690
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