TS9004 Series

300mA CMOS LDO

Adjustable Voltage with Enable & Power Good

3/7

Version: A07

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

--

--

0.1

mA

EN Input Bias Current

--

--

0.5

mA

Shutdown Supply

Current

--

0.5

1

mA

Shutdown Output

Voltage

VO,SD

0

--

0.1

V

Output Under Voltage

--

--

85

Output Over Voltage

115

--

--

PG Leakage Current

--

--

1

mA

PG Voltage Rating

--

--

7

V

PG Voltage Low

--

--

0.4

V

Note2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must

be applied before a current source load is applied.

Detailed Description

The TS9004 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-

current protection, thermal shutdown, and Power Good detection circuitry. The P-channel pass transistor receives data

from the error amplifier, over-current shutdown, 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

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 120

o

C. The

TS9004 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents

over-stress. The TS9004 also incorporates current foldback to reduce power dissipation when the output is short

circuited. This feature becomes active when the output drops below 0.8volts, and reduces the current flow by 65%. Full

current is restored when the voltage exceeds 0.8 volts.

External Capacitors

The TS9004 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

capacitor should be at least 0.1uF to have a beneficial effect.

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.

Power Good

The TS9004 includes the Power Good feature. When the output is not within +10% of the specified voltage, it pulls low.

This can occur under the following conditions:

(1) Input Voltage too low. (2) During Over-Temperature. (3) During Over-Current. (4) If output is pulled up.

(Note: PG pin is an open-drain output.)