MIC5256-2.6YM5 TR Micrel Inc, MIC5256-2.6YM5 TR Datasheet - Page 11

• Manufacturer Part Number: MIC5256-2.6YM5 TR
• Description: 150mA UCap LDO W/Flag( )
• Manufacturer: Micrel Inc

Specifications of MIC5256-2.6YM5 TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.6V
• 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: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1841-2; MIC5256-2.6YM5TR; MIC5256-2.6YM5TR

T
125°C, and T
is layout dependent; Table 1 shows examples of
junction-to-ambient thermal resistance for the MIC5256.
The actual power dissipation of the regulator circuit can
be determined using the equation:
Substituting P
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5256-3.0BM5 at
50°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
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
Micrel, Inc.
August 2010
J(max)
(M5 or D5)
Package
SOT23-5
is the maximum junction temperature of the die,
P
P
P
D
D(max)
D(max)
Table 1. SOT-23-5 Thermal Resistance
= (V
A
Minimum Footprint
θ
D(max)
= 315mW
is the ambient operating temperature. θ
JA
IN
=
Recommended
– V
⎛
⎜
⎝
235°C/W
125
for P
OUT
235
°
C
) I
D
°
−
C/W
OUT
and solving for the operating
50
+ V
°
C
⎞
⎟
⎠
IN
θ
Copper Clad
I
JA
GND
185°C/W
1” Square
145°C/W
θ
JC
JA
11
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.
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
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook.
Fixed Regulator Applications
Figure 1 shows a standard low-noise configuration with a
47kΩ pull-up resistor from the error flag to the input
voltage and a pull-down capacitor to ground for the
purpose of fault indication. EN (Pin 3) is connected to IN
(Pin 1) for an application where enable/shutdown is not
required. C
Figure 1. Low-Noise Fixed Voltage Application
315mW = (V
315mW = V
810mW = V
V
IN(max)
OUT
= 1.0µF minimum.
= 5.4V
IN
IN
IN
·•150mA – 450mW
·•150mA
– 3.0V) 150mA
M9999-080510
MIC5256