TS9002 series

3-3

2004/09 rev. B

Power Good

1.5V

--

--

85

Output under voltage

--

--

75

%

2.5V

115

--

--

Output over voltage

1.2V

125

--

--

%

PG leakage current

--

--

1

uA

PG voltage rating

Vo in regulation

--

--

7

V

Isink = 0.4mA

Vo >1.5V

--

--

0.4

PG voltage low

Isink = 0.1mA

Vo < 1.5V

--

--

0.1

V

Detail Description

Description

The TS9002 series of CMOS regulators contain a P-MOS pass transistor, voltage reference, error amplifier, over

current protection, thermal shutdown and power good function.

The TS9002 series switches from voltage mode to current mode when the load exceeds the rated output current. This

prevents over stress. The TS9002 also incorporates current fold-back to reduce power dissipation when the output is

short circuit. This feature becomes active when the output drops below 0.8V, and reduces the current flow by 65%.

Full current is restored when the voltage exceeds 0.8V.

The internal P-channel pass transistor receives data from the error amplifier, over current shutdown, short output

protection and thermal protection circuits. 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

operation is restored when the junction temperature drops below 120

Enable

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

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

electronic switch.

External Capacitor

The TS9002series is stable with an output capacitor to ground of 2.2uF or greater. It can keep stable even with higher

or poor ESR capacitors.

A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be

larger than 0.1uF to have a beneficial effect.

All capacitors should be placed in close proximity to the pins. A “quiet” ground termination is desirable.

Power Good

The TS9002 includes the Power Good feature. When the output is not within = +/-15% of the specified voltage, it pulls

low. This can occur on other condition – input voltage too low, during over-temperature, during over-current and

output is pulled up.