1/13

December 2004

s

INPUT VOLTAGE FROM 2.5V TO 6V

s

STABLE WITH LOW ESR CERAMIC

CAPACITORS

s

ULTRA LOW DROPOUT VOLTAGE (150mV

TYP. AT 300mA LOAD, 0.4mV TYP. AT 1mA

LOAD)

s

VERY LOW QUIESCENT CURRENT (85µA

TYP. AT NO LOAD, 200µA TYP. AT 300mA

LOAD; MAX 1.5µA IN OFF MODE)

s

GUARANTEED OUTPUT CURRENT UP TO

300mA

s

WIDE RANGE OF OUTPUT VOLTAGE:

1.25V; 1.35; 1.5V; 1.8V; 2V; 2.1V; 2.2V; 2.5V;

2.6V; 2.7V; 2.8V; 2.85V; 2.9V; 3V; 3.1V; 3.2V;

3.3V; 4.7V

s

FAST TURN-ON TIME: TYP. 240µs

s

LOGIC-CONTROLLED ELECTRONIC

SHUTDOWN

s

INTERNAL CURRENT AND THERMAL LIMIT

s

OVER 10Hz to 100KHz

s

S.V.R. OF 55dB AT 1KHz, 50dB AT 10KHz

s

TEMPERATURE RANGE: -40°C TO 125°C

DESCRIPTION

The LDS3985 provides up to 300mA, from 2.5V to

6V input voltage.

It is stable with ceramic and high quality tantalum

capacitor.

The

ultra

low

drop-voltage,

low

quiescent current and low noise makes it suitable

for low power applications and in battery powered

systems. Regulator ground current increases only

slightly in dropout, further prolonging the battery

life. Shutdown Logic Control function is available,

this means that when the device is used as local

regulator, it is possible to put a part of the board in

standby, decreasing the total power consumption.

Typical applications are in mobile phone and

similar

battery

powered

wireless

systems,

portable information appliances.

LDS3985

SERIES

ULTRA LOW DROP-LOW NOISE BICMOS 300mA V.REG.

FOR USE WITH VERY LOW ESR OUTPUT CAPACITOR

Figure 1: Schematic Diagram

DFN6

SOT23-5L

Rev. 1