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PDF LD3985 Data sheet ( Hoja de datos )
| Número de pieza | LD3985 | |
| Descripción | ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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LD3985
SERIES
ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE
REGULATORS LOW ESR CAPACITORS COMPATIBLE
s INPUT VOLTAGE FROM 2.5V TO 6V
s STABLE WITH LOW ESR CERAMIC
CAPACITORS
s ULTRA LOW DROPOUT VOLTAGE (100mV
TYP. AT 150mA LOAD, 0.4mV TYP. AT 1mA
LOAD)
s VERY LOW QUIESCENT CURRENT (85µA
TYP. AT NO LOAD, 170µA TYP. AT 150mA
LOAD; MAX 1.5µA IN OFF MODE)
s GUARANTEED OUTPUT CURRENT UP TO
150mA
s WIDE RANGE OF OUTPUT VOLTAGE: 1.2V;
1.22V; 1.25V; 1.35V; 1.5V; 1.8V; 2V; 2.1V;
2.2V; 2.4V; 2.5V; 2.6V; 2.7V; 2.8V; 2.85V;
2.9V; 3V; 3.1V; 3.2V; 3.3V; 4.7V; 5V
s FAST TURN-ON TIME: TYP. 200µs [CO=1µF,
CBYP= 10nF AND IO=1mA]
s LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s INTERNAL CURRENT AND THERMAL LIMIT
s OUTPUT LOW NOISE VOLTAGE 30µVRMS
OVER 10Hz to 100KHz
s S.V.R. OF 60dB AT 1KHz, 50dB AT 10KHz
s TEMPERATURE RANGE: -40°C TO 125°C
DESCRIPTION
The LD3985 provides up to 150mA, from 2.5V to
6V input voltage.
Figure 1: Schematic Diagram
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 10KHz. 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 LD3985 is designed to work
with low ESR ceramic capacitors. Typical
applications are in mobile phone and similar
battery powered wireless systems.
October 2004
Rev. 8
1/14
1 page  
LD3985 SERIES
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
CO Output Capacitor
Capacitance (Note 6)
1 22 µF
ESR
5 5000 mΩ
Note 1 – For VO(NOM) < 2V, VI = 2.5V
Note 2 – For VO(NOM) = 1.25V, VI = 2.5V
Note 3 – Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This speci-
fication does not apply for input voltages below 2.5V.
Note 4 – Turn-on time is time measured between the enable input just exceeding VINH High Value and the output voltage just reaching 95%
of its nominal value
Note 5 – Typical thermal protection hysteresis is 20°C
Note 6 - The minimum capacitor value is 1µF, anyway the LD3985 is still stable if the compensation capacitor has a 30% tolerance in all
temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS (Tj = 25°C, VI = VO(NOM) +0.5V, CI = CO = 1µF,
CBYP = 10nF, IO = 1mA, VINH = 1.4V, unless otherwise specified)
Figure 4: Output Voltage vs Temperature
Figure 6: Output Voltage vs Temperature
Figure 5: Output Voltage vs Temperature
Figure 7: Shutdown Voltage vs Temperature
5/14
5 Page 
DIM.
A
A1
A2
b
D
E
e
e1
f
f1
LD3985 SERIES
Flip-Chip5 MECHANICAL DATA
MIN.
0.835
0.21
0.625
0.265
1.510
1.16
0.45
0.816
mm.
TYP
0.9
0.25
0.65
0.315
1.540
1.19
0.5
0.866
0.345
0.337
MAX.
0.965
0.29
0.675
0.365
1.570
1.22
0.55
0.916
MIN.
32.874
8.268
24.606
10.433
59.449
45.669
17.717
32.126
mils
TYP.
35.433
9.843
25.591
12.402
60.630
46.850
19.685
34.094
13.583
13.268
MAX.
37.992
11.417
26.575
14.370
61.811
48.031
21.654
36.063
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LD3985.PDF ] | |
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