GT2113 データシートの表示（PDF） - GTM CORPORATION

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GT2113

300 mA CMOS Positive Voltage Regulator

GTM CORPORATION 

ISSUED DATE :2006/04/18

REVISED DATE :

Ordering Information ( contd. )

Part Number

GT2113-15

GT2113-25

GT2113-28

GT2113-30

GT2113-33

GT2113-35

GT2113-37

GT2113-50

Marking

3A152

XXXX

3A252

XXXX

3A282

XXXX

3A302

XXXX

3A332

XXXX

3A352

XXXX

3A372

XXXX

3A502

XXXX

Output Voltage

1.5V

2.5V

2.8V

3.0V

3.3V

3.5V

3.7V

5.0V

Part Number

GT2113-18

GT2113-27

GT2113-29

GT2113-31

GT2113-34

GT2113-36

GT2113-38

GT2113-2H

Marking

3A182

XXXX

3A272

XXXX

3A292

XXXX

3A312

XXXX

3A342

XXXX

3A362

XXXX

3A382

XXXX

3A2H2

XXXX

Output Voltage

1.8V

2.7V

2.9V

3.1V

3.4V

3.6V

3.8V

2.85V

Detailed Description

The GT2113 family of COMS 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

150к, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal

operation is restored when the junction temperature drops below 120к.

The GT2113 switches from voltage mode to current mode when the load exceeds the rated output current.

This prevents over-stress. The GT2113 also incorporates current fold-back to reduce power dissipation when

the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces

the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.

External Capacitors

The GT2113 is stable with an output capacitance to ground of 2.2 F 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 0.1 F ceramic capacitor with a 10 F 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 Vin. The input capacitor should

be at least 0.1 F to have a beneficial effect.

A third capacitor can be connected between the BY-Pass pin and Gnd. This capacitor can be a low cost

Polyester Film variety between the value 0.001 ~ 0.01 F. A large capacitor improves the AC ripple rejection,

but also makes the output come up slowly. This “Soft” turn-on is desirable in 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.

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 1 A. This pin behaves much

like an electronic switch.

Power Good

The GT2113 includes the Power Good feature. When the output is not within ±15% 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.)

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