G5J2167-25 Просмотр технического описания (PDF) - GTM CORPORATION

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G5J2167-25

750mA CMOS Positive Voltage Regulator

GTM CORPORATION 

ISSUED DATE :2006/02/24

REVISED DATE :

Ordering Information ( contd. )

Part Number

G5J2167-15

G5J2167-25

Marking

7F152

XXXX

7F252

XXXX

Output Voltage

1.5V

2.5V

Part Number

G5J2167-18

G5J2167-33

Marking

7F182

XXXX

7F332

XXXX

Output Voltage

1.8V

3.3V

Detailed Description

The G5J2167 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

140 , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal

operation is restored when the junction temperature drops below 120 .

The G5J2167 behaves like a current source when the load reaches 2.2A. However, if the load impedance

drops below 0.3ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal

operation is restored when the load resistance exceeds 0.75ohms.

External Capacitors

The G5J2167 is stable with an output capacitance to ground of 4.7 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.

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

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 2 A. This pin behaves much like an electronic switch.

100K resistor is necessary between VEN source and EN pin when VEN is high than VIN.

(Note: There is no internal pull-up for EN pin. It can not be floating.)

Power Good

The G5J2167 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.)

G5J2167

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