MIC5255-2.8YD5 TR Micrel Inc, MIC5255-2.8YD5 TR Datasheet - Page 11

• Manufacturer Part Number: MIC5255-2.8YD5 TR
• Description: IC REG LDO 150MA 2.8V TSOT23-5
• Manufacturer: Micrel Inc

Specifications of MIC5255-2.8YD5 TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.8V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.135V @ 150mA
• Number Of Regulators: 1
• Current - Output: 150mA
• Current - Limit (min): 160mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2818-2; MIC5255-2.8YD5 TR; MIC5255-2.8YD5TR; MIC5255-2.8YD5TR

The junction-to-ambient thermal resistance for the
minimum footprint is 235°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 3.0V and
an output current of 150mA, the maximum input voltage
can be determined. Because this device is CMOS and
the ground current is typically 100µA over the load
range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation:
Micrel, Inc.
November 2006
315mW = (V
315mW = V
810mW = V
V
IN(max)
= 5.4V
IN
IN
IN
× 150mA – 450mW
× 150mA
– 3.0V) 150mA
11
Therefore, a 3.0V application at 150mA of output current
can accept a maximum input voltage of 5.4V in a SOT-
23-5 package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the “ Reg-
ulator Thermals ” section of Micrel’s Designing with Low-
Dropout Voltage Regulators handbook.
M9999-110906
MIC5255