LD3985XX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

View to exact match

LD3985XX

Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

STMicroelectronics 

Electrical characteristics

LD3985xx

Table 5.

Symbol

Electrical characteristics for LD3985 (continued)

Parameter

Test conditions

Min. Typ. Max. Unit

VI = VO(NOM)+0.25V ±

f = 1kHz

60

SVR Supply voltage rejection VRIPPLE = 0.1V, IO= 50mA

dB

VO(NOM) < 2.5V, VI = 2.55V f = 10kHz

50

IO(PK) Peak output current

VO ≥ VO(NOM) - 5%

300 550

mA

Inhibit input logic low

VINH

VI = 2.5V to 6V, TJ= -40 to 125°C

Inhibit input logic high

1.2

0.4

V

IINH

eN

tON

TSHDN

Inhibit input current

Output noise voltage

Turn On time (4)

Thermal shutdown

CO Output capacitor

VINH = 0.4V, VI = 6V

BW = 10 Hz to 100 kHz, CO = 1µF

CBYP = 10 nF

(5)

Capacitance (6)

ESR

±1

nA

30

µVRMS

100 250

µs

160

°C

1

22

µF

5

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 for 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

8/23

Doc ID 9587 Rev 14

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