MIC5205-4.0YM5 TR Micrel Inc, MIC5205-4.0YM5 TR Datasheet - Page 9

• Manufacturer Part Number: MIC5205-4.0YM5 TR
• Description: IC REG LDO 150MA 1% 4.0V SOT23-5
• Manufacturer: Micrel Inc

Specifications of MIC5205-4.0YM5 TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 4V
• Voltage - Input: Up to 16V
• Voltage - Dropout (typical): 0.165V @ 150mA
• Number Of Regulators: 1
• Current - Output: 150mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: 576-1563-2; MIC5205-4.0YM5TR; MIC5205-4.0YM5TR

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 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. C
Figure 2 is an example of a low-noise configuration
where C
Adjustable Regulator Applications
The MIC5205BM5 can be adjusted to a specific output
voltage by using two external resistors (Figure 3). The
Micrel
February 2006
Figure 1. Ultra-Low-Noise Fixed Voltage Application
V
IN(max)
Figure 2. Low-Noise Fixed Voltage Application
BYP
OUT
= 6.23V
is not required. C
= 2.2µF minimum.
OUT
= 1µF minimum.
9
resistors set the output voltage based on the following
equation:
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 V
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.
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.
V
OUT
=
1.242V
Figure 3. Ultra-Low-Noise
×
⎛
⎜
⎝
R2
R1
+
1
⎞
⎟
⎠
OUT
equation.
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MIC5205