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LDS3985PM21R Datasheet(PDF) 1 Page - STMicroelectronics

Part # LDS3985PM21R
Description  Ultra low drop-low noise BiCMOS 300 mA voltage regulator for use with very low ESR output capacitor
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LDS3985PM21R Datasheet(HTML) 1 Page - STMicroelectronics

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July 2010
Doc ID 11039 Rev 7
1/20
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LDS3985xx
Ultra low drop-low noise BiCMOS 300 mA voltage
regulator for use with very low ESR output capacitor
Features
Input voltage from 2.5 V to 6 V
Stable with low ESR ceramic capacitors
Ultra low dropout voltage (150 mV typ. at 300
mA load, 0.4 mV typ. at 1 mA load)
Very low quiescent current (85 µA typ. at no
load, 200 µA typ. at 300 mA load; max 1.5 µA
in off mode)
Guaranteed output current up to 300 mA
Wide range of output voltage:
– from 1.25 V to 5.0 V
Fast turn-on time: typ. 240 µs
–[CO = 2.2 µF, CBYP = 33 nF and IO = 1 mA]
Logic-controlled electronic shutdown
Internal current and thermal limit
Output low noise voltage 30 µVRMS over 10 Hz
to 100 kHz
SVR of 55 dB at 1 kHz, 50 dB at 10 kHz
Temperature range: - 40 °C to 125 °C
Description
The LDS3985xx provides up to 300 mA, from 2.5
V to 6 V 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.
DFN6
SOT23-5L
Table 1.
Device summary
Part numbers
Output voltages
LDS3985XX15
1.5 V
LDS3985XX18
1.8 V
LDS3985XX25
2.5 V
LDS3985XX28
2.8 V
LDS3985XX30
3.0 V
LDS3985XX33
3.3 V
LDS3985XX50
5.0 V
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