AMS3108S-XX datasheet(7/10 Pages) ADMOS

номер детали	AMS3108S-XX

подробное описание детали	Low self noise

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производитель	ADMOS [Advanced Monolithic Systems]

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AMS3108

Micropower 700mA Low Noise Fast Transient Response LDO

02/11/2010

www.advanced-monolithic.com

Phone (925) 443-0722

7

Fax (925) 443-0723

Device Summary

The AMS3108 is a high voltage low drop out linear

regulator with a current capability of up to 700mA. The

LDO has an input voltage range of 1.5V to 12V with

an output voltage as low as 0.6V and is stable with a

wide range of ceramic, tantalum, and electrolytic

output capacitors.

Shutdown/Enable

The Enable (on/off) input threshold voltage is 1.1V.

When disabled the LDO quiescent current decreases

to a typical value of <1µA.

Fault Protection

Short circuit and over-temperature shutdown disable

the converter and LDO in the event of an overload

condition. Overtemp shutdown disables the device

when the junction temperature exceeds 145 ºC. The

output current is internally limited to 800mA.

Input Capacitor

An input bypass capacitor ranging from 1µF to 10µF

is required. The capacitor should be placed as close

as possible to the device and not be placed more than

1 inch from the LDO.

Output Capacitor

The output capacitor requirements range from the

minimum value required to guarantee stability to

larger values required to meet the extreme transient

response requirements. Values range from 10 to

22µF X5R ceramic capacitors. Due to the extreme

voltage coefficient of X5R ceramic capacitors, the

voltage rating should be at least double the maximum

applied voltage.

Bypass Capacitor

If the ByPass (BYP) is available, connecting a

capacitor between the BYP pin and ground can

significantly reduce output noise. Values can range

from 0pF to 10nF, depending on the sensitivity to

output noise in the application. The start-up speed of

the AMS3108 is inversely proportional to the size of

the bypass capacitor. Applications requiring a slow

ramp-up of output voltage should consider larger

values of bypass capacitance. Likewise, if rapid turn-

on is necessary, consider omitting CBYP.

Because the ByPass (BYP) pin is high-impedance,

careful considering must be taken in the PCB layout

to minimize noise pickup, and capacitors must be

selected to minimize current leakage.

Current

leakage into the BYP pin will directly affect the

regulator’s accuracy and should be kept low as

possible. Using high quality ceramic and film type’s

capacitors are recommended for their low leakage

characteristics.

Adjustable Version: Feedback Resistor Selection

Choosing AMS 3108 with adjustable output voltage

option allows the user to select an output voltage by

using an external resistor divider. AMS 3108 uses a

0.6V reference voltage at the positive terminal of the

error amplifier. To set the output voltage a

programming resistor from the adjust pin (ADJ) to

ground must be selected (See Pg.1). A 10kΩ resistor

is a good selection for a programming resistor R2. A

higher value may result in an excessively sensitive

feedback node while a lower value will draw more

current and degrade the light load efficiency. The

equation for selecting the voltage specific resistor is:

R

1 =

Vout

Vref

-1

·R2 =

1.8V

0.6V

-1

·10kΩ = 20kΩ

Table 1: Adjustable Feedback Resistor values

VOUT (V)

R1 (kΩ)

(R2=10kΩ)

1.8

20.0

2.5

31.6

3.3

45.3

5.0

73.2

Power Good

During

operation,

fault

conditions

can

occur

unexpectedly. Such conditions include input voltage

dropout (low VIN), overheating, or overloading

(excessive output current). If any of these conditions

occurs, the PG pin will set an “error flag”. The PG pin,

which is an open-collector output, will go LOW when

VOUT is less than 95% or the specified output voltage.

When the voltage at VOUT is greater than 95% of the

specified output voltage, the PG pin is HIGH. A logic

pull-up resistor of 10KΩ is recommended at this

output. The pin can be left disconnected if unused.

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