MAS9123A2CA11 データシートの表示（PDF） - Micro Analog Systems Oy

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MAS9123A2CA11

80 mALDO Voltage Regulator IC

Micro Analog Systems Oy 

DA9123.005

31 March 2003

MAS9123

80 mA LDO Voltage Regulator IC

• Very Low Noise: 9.5 µVrms

• Very Short Start-up Time: 20 µs

• Excellent Ripple Rejection: 68 dB

• Stable with Low-ESR Output

Capacitors

• Low Minimum Output Capacitance

Requirement: 0.22 µF

• Regulator Enable/Disable Control

DESCRIPTION

MAS9123 is a low dropout voltage regulator with an

enable/disable pin, which allows device to be turned

off or on by pulling control to low or high.

Due to the very low noise level of only 9.5 µVrms

MAS9123 is highly suitable for very sensitive

circuits, e.g., in portable applications. In addition to

the noise level, MAS9123 excels in dropout voltage

(95 mV typical at 50 mA) and in start-up time

(typically 20 µs from start-up to within ±1% of

VOUT(NOM)). Also its ripple rejection ability of 68 dB at

10 kHz exceed that of competition.

The Equivalent Series Resistance (ESR) range of

output capacitors that can be used with MAS9123 is

FEATURES

• Optimized for Fast Start-up

• Very Low Noise

• Internal Thermal Shutdown

• Short Circuit Protection

• SOT23-5 Package (Pin Compatible with LP2982)

• WL-CSP Package (Pin Compatible with LP3985)

• Output Voltage Options: 2.8, 3.0 and 3.3 V,

see Ordering Information p. 12

very wide. This ESR range from a few mΩ up to a

couple of Ohms combined with no minimum output

current requirement makes the usage of MAS9123

easier and low in cost. Also the minimum output

capacitance requirement is very low. This combined

with very short start-up time makes it possible to

switch the regulator off and on even in timing critical

and/or noise sensitive applications.

An internal thermal protection circuit prevents the

device from overheating. Also the maximum output

current is internally limited. In order to save power

the device goes into sleep mode when the regulator

is disabled.

APPLICATIONS

• RF Oscillators

• Wireless Systems

• Cellular Phones

• Cordless Phones

• Pagers

• Battery Powered Systems

• Portable Systems

• Radio Control Systems

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