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LDS3985 View Datasheet(PDF) - STMicroelectronics

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LDS3985 Datasheet PDF : 13 Pages
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LDS3985
SERIES
ULTRA LOW DROP-LOW NOISE BICMOS 300mA V.REG.
FOR USE WITH VERY LOW ESR OUTPUT CAPACITOR
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
[CO=2.2µF, CBYP= 33nF AND IO=1mA]
s LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s INTERNAL CURRENT AND THERMAL LIMIT
s OUTPUT LOW NOISE VOLTAGE 30µVRMS
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.
Figure 1: Schematic Diagram
DFN6
SOT23-5L
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.
December 2004
Rev. 1
1/13
 

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