ts5215 Taiwan Semiconductor Company, Ltd. (TSC), ts5215 Datasheet - Page 5

• Manufacturer Part Number: ts5215
• Description: 300ma Low Noise Ldo Voltage Regulator With Enable
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

Application Information (Continue)
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.
Thermal Characteristics
TS5215 series is designed to provide 300mA (5V version) of continuous current in a very small package. Maximum
power dissipation can be calculated based on the output current and the voltage drop across the part. To determine
the maximum power dissipation of the package, use the junction-ambient thermal resistance of the device and the
following basic equation:
T
layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation:
Substituting Pd(max) for Pd and solving for the operating conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For example, when operating the TS5215CX33 at room
temperature 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 220
must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 120mA, the
maximum input voltage can be determined. From the electrical characteristics table, the maximum ground current for
120mA output current is 2.5mA.
Therefore, a 3.3V application at 300mA of output current can accept a maximum input voltage of 4.74V in a SOT-25
package.
Fixed Output Regulator Design
enable/shutdown is not required. C
J(MAX)
Includes a 470pF capacitor for low noise operation and
P
P
445mW = (V
445mW = V
445mW = V
1435mW = V
V
P
P
Ultra Low Noise Fixed Voltage Application
D(MAX)
D(MAX)
D(MAX)
IN
shows EN connected to IN for an application where
D
= (V
(max) = 4.74V
is the maximum junction temperature of the die(125
= (125
= 455mW
= [ T
IN
V
– V
IN
J(MAX)
IN
IN
IN
OUT
o
IN
C – 25
* 300mA – 3.3 * 300mA + V
* 300mA – 990mW + V
– 3.3V ) * 300mA + V
* 302.5mA
) * I
– T
OUT
TS5215CX5xx
A
o
C) / 220
] /Θ
+ V
JA
IN
* I
o
C/W
GND
OUT
IN
C
470pF
= 2.2uF minimum.
IN
* 2.5mA
BYP
* 2.5mA
V
C
2.2uF
OUT
OUT
IN
* 2.5mA
5/9
o
C), and Ta is the ambient operating temperature. Θ
An example of a low noise configuration where
bypass is not required. C
Low Noise Fixed Voltage Application
Voltage Regulator with Enable
off
EN
V
IN
on
o
C/W, the maximum power dissipation
300mA Low Noise LDO
TS5215CX5xx
OUT
= 2.2uF minimum
TS5215
Version: B07
V
C
2.2uF
OUT
OUT
JA
is