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LD3985M28R датащи(PDF) 1 Page - STMicroelectronics

номер детали LD3985M28R
подробное описание детали  Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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December 2007
Rev 12
1/22
22
LD3985xx
Ultra low drop-low noise BiCMOS voltage
regulators low ESR capacitors compatible
Features
Input voltage from 2.5 V to 6 V
Stable with low ESR ceramic capacitors
Ultra low dropout voltage (100 mV typ. at 150
mA load, 0.4 mV typ. at 1 mA load)
Very low quiescent current (85 µA typ. at no
load, 170 µA typ. at 150 mA load; max 1.5 µA
in OFF mode)
Guaranteed output current up to 150 mA
Wide range of output voltage: 1.22 V; 1.8 V;
2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V;
4.7 V
Fast turn-on time: typ. 200 µs
[CO = 1 µF, CBYP = 10 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
S.V.R. of 60 dB at 1 kHz, 50 dB at 10 kHz
Temperature range: -40 °C to 125 °C
Description
The LD3985xx provides up to 150 mA, from 2.5 V
to 6 V input voltage.
The ultra low drop-voltage, low quiescent current
and low noise make it suitable for low power
applications and in battery powered systems.
Regulator ground current increases only slightly
in dropout, further prolonging the battery life.
Power supply rejection is better than 60 dB at low
frequencies and starts to roll off at 10 kHz. High
power supply rejection is maintained down to low
input voltage levels common to battery operated
circuits. 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. The LD3985xx is designed to work
with low ESR ceramic capacitors. Typical
applications are in mobile phone and similar
battery powered wireless systems.
Flip-chip
TSOT23-5L
SOT23-5L
(1.57x1.22)
Table 1.
Device summary
Part number
LD3985XX122
LD3985XX28
LD3985XX18
LD3985XX29
LD3985XX25
LD3985XX30
LD3985XX26
LD3985XX33
LD3985XX27
LD3985XX47
www.st.com


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