Electrical characteristics LD3985
8/22 DocID9587 Rev 15
SVR Supply voltage rejection
V
I
= V
O(NOM)
+0.25 V ±
V
RIPPLE
= 0.1 V, I
O
= 50 mA
V
O(NOM)
< 2.5 V, V
I
= 2.55 V
f = 1kHz 60
dB
f = 10kHz 50
I
O(PK)
Peak output current V
O
≥ V
O(NOM)
- 5% 300 550 mA
V
INH
Inhibit input logic low
V
I
= 2.5 V to 6 V, T
J
= -40 to 125 °C
0.4
V
Inhibit input logic high 1.2
I
INH
Inhibit input current V
INH
= 0.4 V, V
I
= 6 V ±1 nA
eN Output noise voltage B
W
= 10 Hz to 100 kHz, C
O
= 1 µF 30 µV
RMS
t
ON
Turn-on time
(4)
C
BYP
= 10 nF 100 250 µs
T
SHDN
Thermal shutdown
(5)
160 °C
C
O
Output capacitor
Capacitance
(6)
122µF
ESR 5 5000 mΩ
1. For V
O(NOM)
< 2 V, V
I
= 2.5 V
2. For V
O(NOM)
= 1.25 V, V
I
= 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 V
INH
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
Table 5. LD3985 electrical characteristics (continued)
Symbol Parameter Test conditions Min. Typ. Max. Unit
