TS2938CS50 RLG

TS2938

Taiwan Semiconductor

Document Number: DS_P0000209 4 Version: G15

and voltage regulator application. Its 500mV (typ.) dropout voltage at full load and over temperature makes it

especially valuable in battery power systems and as high efficiency noise filters in post regulator applications.

Unlike normal NPN transistor design, where the base to emitter voltage drop and collector to emitter saturation

voltage limit the minimum dropout voltage, dropout performance of the PNP output of these devices is limited

only by low V

CE

saturation voltage.

The TS2938 series is fully protected from damage due to fault conditions. Linear current limiting is provided.

Output current during overload conditions is constant. Thermal shutdown the device when the die temperature

exceeds the maximum safe operating temperature. Transient protection allows device survival even when the

input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess

of the desired output voltage to be applied without reverse current flow.

ESR levels may cause an oscillation and/or under damped transient response. A low ESR solid tantalum

capacitor works extremely well and provide good transient response and stability over temperature. Aluminum

electrolytic can also be used, as long as the ESR of the capacitor is <2ohm. The value of the output capacitor

can be increased without limit. Higher capacitance values help to improved transient response and ripple

rejection and reduce output noise.

TS2938

Taiwan Semiconductor

Document Number: DS_P0000209 5 Version: G15

APPLICATION INFORMATION (CONTINUED)

Minimum Load Current

The TS2938 series is specified between finite loads. If the output current is too small leakage currents dominate

and the output voltage rises. A 5mA minimum load current is necessary for proper regulation.

A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of

the application. Under all possible operating conditions, the junction temperature must be within the range

specified under absolute maximum ratings. To determine if the heatsink is required, the power dissipated by the

regulator, P

The below formula shows the voltages and currents for calculating the P

in the regulator:

I

P

-V

) * I

+ (V

) * I

T

R

T

R

J

(max) – T

A

Where: T

Using the calculated values for T

TS2938 feature an active-low (Inhibit) input that allows ON/OFF control of the regulator. The Inhibit input has

TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. Inhibit should be directly tied to

Ground or keep open (not connected).

TS2938

Taiwan Semiconductor

Document Number: DS_P0000209 6 Version: G15

MARKING DIAGRAM

Voltage Code ( 50=5.0V, 33=3.3V )

Year Code

T

V

Y

Z