SSC2119 查看數據表（PDF） - Secos Corporation.

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SSC2119

1.55A CMOS Low Dropout Voltage Regulator

Secos Corporation. 

Elektronische Bauelemente

SSC2119

1.55A CMOS

Low Dropout Voltage Regulator

Ordering Information(contd.)

Part Number

SSC2119-AD

Marking

9AAD2

XXXX

Output Voltage

Adjustable

Part Number

Marking

Output Voltage

Detailed Description

The SSC2119 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 exceeds140oC, or the current exceeds 2.2A.During thermal shutdown, the output voltage

remains low. Normal operation is restored when the junction temperature drops below 120oC.

External Capacitors

The SSC2118 is stable with an output capacitance to ground of 4.7uF 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 V IN. The input capacitor should be at least 0.1uF to have a beneficial effect. All capacitors should

placed in closed proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.

Enable

When pulled low, the PMOS pass transistor shuts 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.

Adjustable Version

The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to

1.242 V and Vout is given by the equation:

VOUT=Vadj*(1+R1/R2)

Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will reduce stability. In general,

R1 and R2 in the 10's of kΩ will produce adequate stability, given reasonable layout precautions. To improve stability characteristics,

keep parasitic on the ADJ pin to min., and lower R1 and R2 values.

ht tp://www.SeCoSGmbH.com/

01-Jun-2002 Rev. A

Any changing of specification will not be informed individual

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