TS5204

150mA Low Noise LDO Voltage Regulator

3/8

Version: F11

Application Information

TS5204 series is designed to provide 150mA (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:

Tj(max) is the maximum junction temperature of the die(125

Θ

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 TS5204CX33 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 120mA of output current can accept a maximum input voltage of 6.85V in a SOT-

23 package.

Input Capacitor Requirement

An input capacitor of 0.1uF or greater is recommended when the device is more than 10” away from the bulk AC

supply capacitance or when the supply is a battery.

Output Capacitor Requirement

The TS5204 series requires an output capacitor to maintain stability and improve transient response is necessary.

2.2uF minimum is recommended. Larger values improve the regulator’s transient response. The output capacitor

value may be increased without limit.

The output capacitor should have an ESR (effective series resistance) less than 5

and a resonant frequency

above 1MHz. Ultra low ESR capacitors can cause a low amplitude oscillation on the output and/or under damped

transient response. Most of tantalum or aluminum electrolytic capacitors are adequate; film types will work. Since

many aluminum electrolytic have electrolytes that freeze at about –30

operation below –25

No Load Stability

The TS5204 series 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 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.