GQ2141 查看數據表（PDF） - GTM CORPORATION

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GQ2141

CMOS Positive Voltage Regulator

GTM CORPORATION 

ISSUED DATE :2006/04/04

REVISED DATE :

Ordering Information ( contd. )

Part Number

GQ2141-AD

Marking

1DAD2

XXXX

Output Voltage

Adjustable

Part Number

Marking

Output Voltage

Detailed Description

The GQ2141 of COMS regulator contains 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

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

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

The GQ2141 switches from voltage mode to current mode when the load exceeds the rated output current.

This prevents over-stress. The GQ2141 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 GQ2141 is stable with an output capacitance to ground of 0.22 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.

A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should

be at least 1 F to have a beneficial effect.

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.

Shutdown

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.

Adjustable Version

The GQ2141 features a user-adjustable output through an external feedback resister divider. To set the output

of GQ2141 use the following equation:

VOUT=VADJ * (1+R1/R2)

VADJ=1.225, use 1% or better resistors

Characteristics Curve

GQ2141

Page: 3/5

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