LD3985XX Datasheet, PDF (1/23 Pages) STMicroelectronics – Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

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 (60 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 [C_O = 1 µF, C_BYP
= 10 nF and I_O = 1 mA]
■ Logic-controlled electronic shutdown
■ Internal current and thermal limit
■ Output low noise voltage 30 µV_RMS over 10 Hz
to 100 kHz
■ SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
■ Temperature range: - 40 °C to 125 °C
Description
Flip-chip
(1.57 x 1.22)
SOT23-5L
TSOT23-5L
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.
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
Table 1. Device summary
Part numbers
LD3985XX122
LD3985XX18
LD3985XX25
LD3985XX26
LD3985XX27
LD3985XX28
LD3985XX29
LD3985XX30
LD3985XX33
LD3985XX47
January 2011
Doc ID 9587 Rev 14
1/23
www.st.com
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