01-Jun-2002 Rev. A

Page

3 of 5

ht tp://www.SeCoSGmbH.com/

Any changing of specification will not be informed individual

Elektronische Bauelemente

Detailed Description

The SSC2146 series of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and

thermal shutdown.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 C, or the current exceeds 600mA. During thermal shutdown

, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 C. The SSC2146 switches

from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The SSC2146 also

incorporates current fold-back to reduce power dissipation when the output is short circuited. The feature becomes active when the

output drops below 0.8 V, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 V.

o

External Capacitors

The SSC2146 is stable with an output capacitance 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

The input capacitor should be at least 0.1uF to have a beneficial effect. A third capacitor can be

Enable

When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent

current is less than 2uA. This pin behaves much like an electronic switch.

o

connected between the BY-PASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of

0.001~0.01uF. A large capacitor improves the AC ripple rejection,but also makes the output come up slowly. This "Soft" turn-on

is desirablein some applications to limit turn-on surges. 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.

Ordering Information(contd.)

SSC2146-15

6D182

XXXX

6D272

XXXX

6D2H2

XXXX

6D302

XXXX

6D332

XXXX

6D352

XXXX

6D372

XXXX

Part Number

Marking

Output Voltage

Part Number

Marking

Output Voltage

6D152

1.5V

2.5V

2.8V

2.9V

3.1V

3.4V

3.6V

3.8V

1.8V

2.7V

2.85V

3.0V

3.3V

3.5V

3.7V

XXXX

6D252

XXXX

6D282

XXXX

6D292

XXXX

6D312

XXXX

6D342

XXXX

6D362

XXXX

6D382

XXXX

SSC2146-25

SSC2146-28

SSC2146-29

SSC2146-31

SSC2146-34

SSC2146-36

SSC2146-38

SSC2146-18

SSC2146-27

SSC2146-2H

SSC2146-30

SSC2146-33

SSC2146-35

SSC2146-37

SSC2146

600mA CMOS

Positive Voltage Regulator