AQ1117CY-M1-33-TRL datasheet, PDF

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AQ1117CY-M1-33-TRL: Descriptionlow dropout 1 amp voltage regulator; File Size270KB，7 Pages; ManufacturerAcutechnology

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AQ1117CY-M1-33-TRL Overview

low dropout 1 amp voltage regulator

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AQ1117

Low Dropout

1 Amp Voltage Regulator

Product Specification

Revision 1.5

September 19, 2005

General Description

The AQ1117 is a low dropout three terminal

voltage regulator, offered in popular fixed options

or an adjustable version that can set a precise

voltage from 1.22V to 12V with two external

resistors.

AQ1117 is offered in SOT-89 which has a lower

thermal resistance and fits in smaller foot print

than a standard SOT-223.

With a dropout

voltage of less than one volt, the AQ1117 can be

used in applications where drop out voltage and

size are an issue.

To assure accuracy within 1.5% over

temperature the heart of the AQ1117 is a self-

correcting AcuRef™ bandgap reference.

On-chip current limit and thermal shutdown with

hysteresis protects against any combination of

overload and ambient temperature that might

cause the junction temperature to exceed safe

limits.

Applications

•

Graphic cards

•

PC motherboards

•

Switching power supply post-regulation

•

Telecom equipment

•

DVD video player

Features

•

Featured in small

SOT- 89

package

•

Vout tolerance 1.5% over temperature

•

Stable with low cost 1uF capacitor

•

Low dropout voltage (1V at 1 Amp)

•

Thermal protection with hysteresis

•

Short circuit protection

•

Offered with 1.8V, 2.5V, and 3.3V fixed or

•

adjustable output

RoHS complaint

available

Typical Application

www.acutechnology.com

AQ1117

Acutechnology Semiconductor Inc.

AQ1117

Application Notes

1. Typical Application

Notes:

1. Output voltage is 1.22V * (R2 +R1)/R1

2. Input and output capacitors should be located close to the device.

3. The AQ1117 will remain stable with C1 and C2 as low as 1.0µF. Overall transient

performance is improved with increased capacitance.

2. Stability

An input capacitor is recommended. A 1.0µF capacitor on the input is a suitable input

bypassing for almost all applications. A larger capacitor is also suitable. In the adjustable

version the “adjust” terminal can be bypassed to ground with a bypass capacitor (C

ADJ

) to

improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the

output voltage is increased. At any ripple frequency, the impedance of the C

ADJ

should be

less than R1 (being R1 the resistor between the output and the adjust pin) to prevent the

ripple from being amplified:

Z = 1/(2π*f

RIPPLE

* C

ADJ

) < R1

R1 is normally in the range of 1KΩ.

The output capacitor is critical in maintaining regular stability. The AQ1117 is stable with an

output capacitor greater than. Of course any increase of the output capacitor will merely improve

the loop stability and the load transient response. In the case of the adjustable regulator, when

the C

ADJ

is used, a larger output capacitance may be required. Tantalum Capacitors exhibit the

best stability over a wide range of loads and are recommended.

3. Output Voltage

The AQ1117 adjustable version develops a 1.22V reference voltage between the output and

the adjust pin terminal. This voltage is applied across the resistor R1 to generate a constant

current (I1). The current from the adjust terminal could introduce error to the output, but since

it is very small (< 20µA) compared with the current I1 and very constant with line and load

changes, the error can be ignored. The constant current I1 then flows through resistor R2

and sets the output voltage to the desired level.

www.acutechnology.com

Rev. 1.5 September 20, 2005

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