TS5201CS datasheet(5/6 Pages) TSC

5 / 6 page

TS5201 series

5-6

2005/08 rev. C

Application Information (continues)

Thermal Characteristics

TS5201 series is designed to provide 200mA 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:

Pd(max) = [ Tj(max) – Ta ] /Θja

Tj(max) is the maximum junction temperature of the

die(125

oC), and Ta is the ambient operating

temperature. Θja is layout dependent, the actual

power dissipation of the regulator circuit can be

determined using the equation:

Pd = ( Vin – Vout ) * Iout + Vin * Ignd

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

TS5201CX533 at room temperature with a minimum

footprint layout, the maximum input voltage for a set

output current can be determined as follows:

Pd(max) = (125

oC – 25oC) / 220oC/W

Pd(max) = 455mW

The junction to ambient thermal resistance for the

minimum footprint is 220

oC/W, the maximum power

dissipation must not be exceeded for proper operation.

Using the output voltage of 3.3V and an output current

of 200mA, the maximum input voltage can be

determined. Formt eh electrical characteristics table,

the maximum ground current for 200mA output current

is 2.5mA.

445mW = ( Vin – 3.3V ) * 200mA + Vin * 2.5mA

445mW = Vin * 200mA – 3.3 * 200mA + Vin * 2.5mA

445mW = Vin * 200mA – 495mW + Vin * 2.5mA

950mW = Vin * 152.5mA

Vin(max) = 6.23v

Therefore, a 3.3V application at 200mA of output

current can accept a maximum input voltage of 6.23V

in a SOT-25 package.

Noise Reduction Capacitors

On adjustable devices, a capacitor from ADJ to GND

will decrease high frequency noise on the output. See

following figure

Minimum Load

The TS5201 will remain stable and in regulation

with no load unlike many other voltage regulators.

This is especially important in CMOS RAM

keep-alive applications.

Dual-Supply Systems

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.

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