TS29150/1/2/3

1.5A Ultra Low Dropout Voltage Regulator

with Multi-Function

5/11

Version: A07

Typical Application Circuit

The TS29150/1/2/3 series are high performance with low dropout voltage regulator suitable for moderate to high

current and voltage regulator application. Its 350mA(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

saturation voltage.

The TS29150/1/2/3 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.

Capacitor Requirement

The TS29150/1/2/3 series requires an output capacitor to maintain stability and improve transient response is

necessary. The value of this capacitor is dependent upon the output current, lower currents allow smaller capacitors.

TS29150/1/2/3 series regulators are stable with the 10uF minimum capacitor value at full load. Where the regulator

is powered from a source with high AC impedance, a 0.1uF capacitor connected between input and ground is

recommended. The capacitor should have good characteristics to above 250KHz. The capacitance values will be

help to improved transient response, ripple rejection and output noise.

Minimum Load Current

The TS29150/1/2/3 series is specified between finite loads. If the output current is too small leakage currents

dominate and the output voltage rises. A 10mA minimum load current swamps any expected leakage current across

the operating temperature range.

Thermal Characteristics

TS29150/1/2/3 series linear regulators are simple to use, the most complicated design parameters to consider are

thermal characteristics, thermal design requires the following application specification parameters:

* Maximum ambient temperature, Ta

We calculate the power dissipation of the regulator from these numbers and the device parameters from this data

sheet. 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

= 400mW + 36mW

= 436mW