SI91871 datasheet(2/10 Pages) VISHAY

Part #	SI91871

Description	300-mA Ultra Low-Noise LDO Regulator With Discharge Option

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Manufacturer	VISHAY [Vishay Siliconix]

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Si91871

Vishay Siliconix

www.vishay.com

2

Document Number: 72012

S-51147—Rev. F, 20-Jun-05

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings

Input Voltage, VIN to GND

−6.0 to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VSD (See Detailed Description)

−0.3 V to VIN

. . . . . . . . . . . . . . . . . . . . . . . . . .

Output Current, IOUT

Short Circuit Protected

. . . . . . . . . . . . . . . . . . . . . . . . . .

Output Voltage, VOUT

−0.3 V to VIN + 0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package Power Dissipation, (Pd)b

2.3 W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermal Resistance (qJA)a

55_C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

R(qJA)a

8_C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum Junction Temperature, TJ(max)

150_C

. . . . . . . . . . . . . . . . . . . . . . .

Storage Temperature, TSTG

−65_C to 150_C

. . . . . . . . . . . . . . . . . . . . . . . . . .

Notes

a.

Device mounted with all leads soldered or welded to PC board.

b.

Derate 20 mW/_C above TA = 25_C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation

of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

Input Voltage, VIN

2 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Voltage, VSD

0 V to VIN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Current

0 to 300 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CIN, COUTa (Ceramic)

2.2 mF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CEB (Ceramic)

0.01 mF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Ambient Temperature, TA

−40_C to 85_C

. . . . . . . . . . . . . . . . . . . .

Operating Junction Temperature, TJ

−40_C to 125_C

. . . . . . . . . . . . . . . . . . .

Notes

a.

Maximum ESR of COUT: 0.2 W.

SPECIFICATIONS

Test Conditions Unless Specified

TA = 25_C, VIN = VOUT(nom) + 1 V

C

Limits

−40 to 85_C

Parameter

Symbol

()

IOUT = 1 mA, CIN = 2 mF, COUT = 2.0 mF

VSD = 1.5 V

Tempa

Minb

Typc

Maxb

Unit

Start-Up BP Current

IOUT

ON/OFF = High

Room

1

mA

Input Voltage Range

VIN

Full

2

6

V

VOUT w 18 V

Room

−2.0

1

2.0

Output Voltage Accuracy

1 mA v IOUT v 300 mA

VOUT w 1.8 V

Full

−3.0

1

3.0

%

Output Voltage Accuracy

1 mA v IOUT v 300 mA

VOUT = 1 2 V 1 5 V

Room

−2.5

1

2.5

%

VOUT = 1.2 V, 1.5 V

Full

−3.5

1

3.5

Line Regulation (VOUT v 3 V)

Full

−0.06

0.18

Line Regulation

(3.0 V < VOUT v3.6 V)

DVOUT 100

DVIN VOUT(nom)

From VIN = VOUT(nom) + 1 V to VOUT(nom) + 2 V

Full

0

0.3

%/V

Line Regulation (5-V Version)

IN

OUT(nom)

From VIN = 5.5 V to 6 V

Full

0

0.4

IOUT = 1 mA

Room

1

Dt V lt

dg

IOUT = 50 mA

Room

45

80

Dropout Voltaged, g

(VOUT(nom) w 2.6 V)

IOUT = 50 mA

Full

50

90

(VOUT(nom) w 2.6 V)

IOUT = 300 mA

Room

300

350

VIN − VOUT

IOUT = 300 mA

Full

415

mV

IN

OUT

IOUT = 50 mA

Room

65

100

Dropout Voltaged, g

(VOUT(

) t 26 V VIN w

IOUT = 50 mA

Full

120

(VOUT(nom) t 2.6 V, VIN w

2 V)

IOUT = 300 mA

Room

400

520

2 V)

IOUT = 300 mA

Full

570

IOUT = 0 mA

Room

100

150

Ground Pin Currente, g

IOUT = 0 mA

Full

180

Ground Pin Currente, g

(VOUT(nom) v 3 V)

IOUT = 300 mA

Room

130

200

IGND

IOUT = 300 mA

Full

330

mA

IGND

IOUT = 0 mA

Room

110

170

mA

Ground Pin Currente

IOUT = 0 mA

Full

200

Ground Pin Currente

(VOUT(nom) u 3 V)

IOUT = 300 mA

Room

150

225

IOUT = 300 mA

Full

275

Peak Output current

IO(peak)

VOUT w 0.95 x VOUT(nom). tPW = 2 ms

Full

400

mA

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