TS9015

300mA CMOS LDO

0.9V Adjustable Voltage with Enable Function

3/5

Version: D08

Detailed Description

The TS9015 of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current

protection and thermal shutdown. During normal operation, the error amplifier compares the output voltage to a

precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature

exceeds 150

o

C, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal

operation is restored when the junction temperature drops below 100

o

C. The TS9015 switches from voltage mode

to current mode when the load exceeds the rated output current.

External Capacitors

The TS9015 is stable with an output capacitor to ground of 2.2uF or greater. Ceramic capacitors have the lowest

ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR,

resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive.

One option is to parallel a 0.1uF ceramic capacitor with a 10uF Aluminum Electrolytic. The benefit is low ESR, high

capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize

All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be

achieved with a "Star" connection.

Enable

The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal

circuits are powered down. In this state, the quiescent current is less than 1mA. This pin behaves much like an

electronic switch.