LD3985(2017) Ver la hoja de datos (PDF) - STMicroelectronics
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LD3985 Datasheet PDF : 18 Pages
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Electrical characteristics
LD3985
Table 4. Electrical characteristics (continued)
Symbol
Parameter
Test conditions Min.
Typ.
Max.
Unit
IO = 1 mA
0.4
IO = 1 mA,
2
TJ= -40 to 125 °C
IO = 50 mA
20
VDROP Dropout voltage (3)
IO = 50 mA,
TJ= -40 to 125 °C
IO = 100 mA
35
mV
45
IO = 100 mA,
70
TJ= -40 to 125 °C
IO = 150 mA
60
IO = 150 mA,
100
TJ= -40 to 125 °C
ISC Short-circuit current RL = 0
600
mA
VI =
f=1
VO(NOM)+0.2 kHz
60
5V±
SVR
Supply voltage
rejection
VRIPPLE = 0.1 f =
V, IO= 50 mA 10
50
dB
VO(NOM) < 2.5 kHz
V, VI = 2.55 V
IO(PK) Peak output current VO ≥ VO(NOM) - 5%
300
550
mA
Inhibit input logic
VINH
low
Inhibit input logic
high
VI = 2.5 V to 6 V,
TJ= -40 to 125 °C
1.2
0.4
V
IINH
Inhibit input current VINH = 0.4 V,
VI = 6 V
eN
Output noise voltage
BW = 10 Hz to 100
kHz, CO = 1 µF
tON Turn-on time (4)
CBYP = 10 nF
TSHDN Thermal shutdown (5)
Capacitance (6)
1
CO Output capacitor
ESR
5
±1
nA
30
µVRMS
100
250
µs
160
°C
22
µF
5000
mΩ
1. For VO(NOM) < 2 V, VI = 2.5 V
2. For VO(NOM) = 1.25 V, VI = 2.5 V
3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its
nominal value. This specification does not apply to input voltages below 2.5 V
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
5. Typical thermal protection hysteresis is 20 °C
6. The minimum capacitor value is 1 µF, anyway the LD3985 is still stable if the compensation capacitor has a
30% tolerance in all temperature range
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DocID9587 Rev 16
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