LD3985 Datasheet, PDF (5/14 Pages) STMicroelectronics – ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE

LD3985 SERIES
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
C_O Output Capacitor
Capacitance (Note 6)
1
22
µF
ESR
5
5000 mΩ
Note 1 – For V_O(NOM) < 2V, V_I = 2.5V
Note 2 – For V_O(NOM) = 1.25V, V_I = 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 V_INH 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 (T_j = 25°C, V_I = V_O(NOM) +0.5V, C_I = C_O = 1µF,
C_BYP = 10nF, I_O = 1mA, V_INH = 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
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