LDS3985 datasheet(4/13 Pages) STMICROELECTRONICS

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LDS3985 SERIES

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Table 5: Electrical Characteristics For LDS3985 (Tj = 25°C, VI = VO(NOM) +0.5V, CI = 1µF, CO = 2.2µF

CBYP = 33nF, IO = 1mA, VINH = 1.4V, unless otherwise specified)

Note 1: For VO(NOM) < 2V VI = 2.5V

Note 2: For VO(NOM) =1.25V VI = 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 specifi-

cation does not apply for input voltages below 2.5V.

Note 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

Note 5: Typical thermal protection hysteresis is 20°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Operating Input Voltage

2.5

Output Voltage < 2.5V

IO = 1 mA

-50

TJ= -40 to 125°C

-75

Output Voltage

≥ 2.5V

IO = 1 mA

-2

% of

VO(NOM)

TJ= -40 to 125°C

-3

∆V

Line Regulation (Note 1)

VI = VO(NOM) + 0.5 to 6 VTJ= -40 to 125°C

-0.1

0.1

%/V

VO = 4.7 to 5V

-0.19

0.19

∆V

Load Regulation

IO = 1 mA to 300mA

VO ≤ 2.5V

TJ= -40 to 125°C

0.005

0.01

%/mA

∆V

Load Regulation

IO = 1 mA to 300mA

VO ≥ 2.5V

TJ= -40 to 125°C

0.0008

0.004

%/mA

∆V

Output AC Line Regulation

(Note 2)

VI = VO(NOM) + 1 V, IO = 300mA,

tR= tF = 30µs

5mVPP

Quiescent Current

ON MODE: VINH = 1.24V

IO = 0

µA

IO = 0

TJ= -40 to 125°C

150

IO = 0 to 300mA

200

IO = 0 to 300mA

TJ= -40 to 125°C

300

OFF MODE: VINH = 0.4V

0.003

TJ= -40 to 125°C

1.5

VDROP Dropout Voltage (Note 3)

IO = 1mA

0.4

IO = 1mA

TJ= -40 to 125°C

IO = 150mA

TJ= -40 to 125°C

100

IO = 300mA

150

IO = 300mA

TJ= -40 to 125°C

250

ISC

Short Circuit Current

RL = 0

600

SVR

Supply Voltage Rejection

VI = VO(NOM)+0.25V ±

VRIPPLE = 0.1V,

IO= 50mA

For VO(NOM) < 2.5V, VI=2.55V

f = 1KHz

f = 10KHz

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

1.4

IINH

Inhibit Input Current

VINH = 0.4V

VI = 6V

±1

Output Noise Voltage

BW = 10 Hz to 100 KHz

CO = 2.2 µF30

µV

RMS

tON

Turn On Time (Note 4)

CBYP = 33 nF

240

µs

TSHDN Thermal Shutdown

Note 5

160

°C

Output Capacitor

Capacitance (Note 6)

2.2

µF

ESR

5000

Ω

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