LD39050XX Datasheet, PDF (1/24 Pages) STMicroelectronics – 500 mA low quiescent current low noise voltage regulator

LD39050xx
500 mA low quiescent current
low noise voltage regulator
Features
■ Input voltage from 1.5 to 5.5 V
■ Ultra low dropout voltage (200 mV typ. at 500
mA load)
■ Very low quiescent current (20 µA typ. at no
load, 100 µA typ. at 500 mA load, 1 µA max in
off mode)
■ Very low noise without bypass capacitor
■ Output voltage tolerance: ± 2.0 % @ 25 °C
■ 500 mA guaranteed output current
■ Wide range of output voltages available on
request: 0.8 V to 4.5 V with 100 mV step and
ADJ from 0.8 V
■ Logic-controlled electronic shutdown
■ Compatible with ceramic capacitor
C_OUT = 1 µF
■ Internal current and thermal limit
■ Package DFN6 (3 x 3 mm)
■ Temperature range: -40 °C to 125 °C
DFN6 (3 x 3 mm)
roll off at 10 kHz. An Enable logic control function
puts the LD39050 in shut-down mode allowing a
total current consumption lower than 1 µA. The
device also includes short-circuit constant current
limiting and thermal protection. Typical
applications are mobile phones, personal digital
assistants (PDAs), cordless phones and similar
battery-powered systems.
Description
The LD39050 provides 500 mA maximum current
from an input voltage ranging from 1.5 V to 5.5 V
with a typical dropout voltage of 200 mV. Stability
is provided using ceramic capacitors. The ultra
low drop-voltage, low quiescent current and low
noise features make it suitable for low power
battery-powered applications. Power supply
rejection is 65 dB at low frequencies and starts to
Table 1. Device summary
Part numbers
Order codes
LD39050XX
LD39050XX10
LD39050XX12
LD39050XX25
LD39050XX33
LD39050PUR
LD39050PU10R
LD39050PU12R
LD39050PU25R
LD39050PU33R
Output voltages
ADJ from 0.8 V
1.0 V
1.2 V
2.5 V
3.3 V
March 2009
Rev 1
1/24
www.st.com
24