GQ2171-27 datasheet, PDF - EEWORLD Datasheet

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GQ2171-27: DescriptionC M O S P o s i t i v e Vo l t a g e R e g u l a t o r; File Size751KB，5 Pages; ManufacturerETL [E-Tech Electronics LTD]

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C M O S P o s i t i v e Vo l t a g e R e g u l a t o r

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ISSUED DATE :2005/12/12

REVISED DATE :

GQ2171

Description

C M O S P o s i t i v e Vo l t a g e R e g u l a t o r

The GQ2171 series of positive, linear regulators feature low quiescent current (50 A typ.) with low dropout

voltage and excellent PSRR, thus making them ideal for Telecommunications and other battery applications.

These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under

the “Worst” of operating conditions.

As an additional feature, the GQ2171 is stable with an output capacitance of just extended 0.22 F or greater.

Features

Low Dropout Voltage

Very

Functional Block Diagram

Applications

Battery Powered Widgets

&Instrumentation

&Wireless Devices

&PC Peripherals

&Portable Electronics

&Cordless Phones

&Electronic Scales

&Cellular Phones

&Cameras

&Telecommunications

&Guaranteed 150mA output

&Over-Temperature Shutdown

&Current Limiting

&Short Circuit Current Fold-back

&Excellent PSRR Type 70dB

&Noise Reduction Bypass Capacitor

&Power-saving Shutdown Mode

&Factor Pre-set Output Voltage

Package Dimensions

REF.

Millimeter

Min.

Max.

2.70

3.10

2.60

3.00

1.40

1.80

0.30

0.55

0.10

0°

10°

REF.

Dimensions

Millimeter

1.90 REF.

1.20 REF.

0.12 REF.

0.37 REF.

0.60 REF.

0.95 REF.

Typical Application Circuit

1/5

ISSUED DATE :2005/12/12

REVISED DATE :

Ordering Information ( contd. )

Part Number

GQ2171-15

GQ2171-20

GQ2171-27

GQ2171-2H

GQ2171-32

XXXX

Marking

1K152

1K202

1K272

1K2H2

Output Voltage

1.5V

2.0V

2.7V

2.85V

3.2V

Part Number

GQ2171-18

GQ2171-25

GQ2171-28

GQ2171-30

GQ2171-33

XXXX

Marking

1K182

Output Voltage

1.8V

2.5V

2.8V

3.0V

3.3V

1K252

1K282

1K302

1K332

1K322

The GQ2171 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 : , or the current exceeds 150mA. During thermal shutdown, the output voltage remains low. Normal

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

The GQ2171 switches from voltage mode to current mode when the load exceeds the rated output current.

This prevents over-stress. The GQ2171 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.

The GQ2171 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.

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.

Detailed Description

External Capacitors

Shutdown

Characteristics Curve

3/5

GQ2171-27 Related Products

	GQ2171-27	GQ2171-15	GQ2171-20	GQ2171-2H	GQ2171-32	GQ2171
Description	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r	C M O S P o s i t i v e Vo l t a g e R e g u l a t o r

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