LD3985G28R datasheet(8/22 Pages) STMICROELECTRONICS

8 / 22 page

Electrical characteristics

LD3985xx

8/22

Note:

For VO(NOM) < 2 V, VI = 2.5 V

2For VO(NOM)= 1.25 V, VI = 2.5 V

Dropout voltage is the input-to-output voltage difference at which the output voltage is

100mV below its nominal value. This specification does not apply for input voltages below

2.5V.

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

Typical thermal protection hysteresis is 20 °C

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.

IO(PK)

Peak output current

VO ≥ VO(NOM) - 5%

300

550

VINH

Inhibit input logic low

VI = 2.5V to 6V, TJ= -40 to 125°C

0.4

Inhibit input logic high

1.2

IINH

Inhibit input current

VINH = 0.4V, VI = 6V

±1

Output noise voltage

BW = 10 Hz to 100 kHz, CO = 1µF

µVRMS

tON

Turn On time (Note 4)CBYP = 10 nF

100

250

µs

TSHDN Thermal shutdown

Note 5

160

°C

Output capacitor

Capacitance (Note 6)

µF

ESR

5000

Table 5.

Electrical characteristics for LD3985 (continued) (TJ = 25 °C, VI = VO(NOM) +0.5 V, CI = 1

µF, CBYP = 10 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

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