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PDF LD3985xx Data sheet ( Hoja de datos )
| Número de pieza | LD3985xx | |
| Descripción | Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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.
Flip-chip
(1.57x1.22)
SOT23-5L
TSOT23-5L
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.
Table 1. Device summary
LD3985XX122
LD3985XX18
LD3985XX25
LD3985XX26
LD3985XX27
December 2007
Part number
Rev 12
LD3985XX28
LD3985XX29
LD3985XX30
LD3985XX33
LD3985XX47
1/22
www.st.com
22
1 page  
LD3985xx
3 Typical application
Figure 3. Typical application circuit
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Typical application
5/22
5 Page 
LD3985xx
Typical performance characteristics
Figure 16. Quiescent current vs temperature Figure 17. Quiescent current vs temperature
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Figure 18. Supply voltage rejection vs
frequency
Figure 19. Load transient response
Figure 20. Line transient response
VI = 3.2V, IO = 1 to 150mA, Rise-Fall time = 1µsec
Figure 21. Start-Up
VI = 3.8V to 4.4V, TJ = 25°C, IO = 150mA, CI = CO = 1µF
(X7R), CBYP = 10nF, Rise-Fall time = 1µsec, VO = 2.7V
VI = 3.3V, IO = 1mA, CI = CO = 1µF (cer), CBYP = 10nF,
Tr = 20ns, VO = 2.8V
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LD3985xx.PDF ] | |
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