LP3881

SNVS224F – MARCH 2003 – REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS

Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.

Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = COUT = 4.7 µF, VS/D = VBIAS.

Symbol

Parameter

Conditions

Min(1)

Typical(2)

Max(1)

Units

VO

Output Voltage Tolerance

10 mA < IL < 0.8A

1.198

1.234

VO(NOM) + 1V ≤ VIN ≤ 5.5V

1.216

4.5V

≤ VBIAS ≤ 6V

1.186

1.246

1.478

1.522

1.5

V

1.455

1.545

1.773

1.827

1.8

1.746

1.854

ΔVO/ΔVIN

Output Voltage Line Regulation(3)

VO(NOM) + 1V ≤ VIN ≤ 5.5V

0.01

%/V

ΔVO/ΔIL

Output Voltage Load Regulation(4)

10 mA < IL < 0.8A

0.04

%/A

0.06

VDO

Dropout Voltage(5)

IL = 0.8A

120

75

(TO220 and TO263 only)

160

mV

IL = 0.8A

140

80

(SOIC only)

190

IQ(VIN)

Quiescent Current Drawn from VIN

10 mA < IL < 0.8A

7

3

mA

Supply

8

VS/D ≤ 0.3V

1

0.03

µA

30

IQ(VBIAS)

Quiescent Current Drawn from

10 mA < IL < 0.8A

2

1

mA

VBIAS Supply

3

VS/D ≤ 0.3V

1

0.03

µA

30

ISC

Short-Circuit Current

VOUT = 0V

2.5

A

Shutdown Input

VSDT

Output Turn-off Threshold

Output = ON

1.3

0.7

V

Output = OFF

0.7

0.3

Td (OFF)

Turn-OFF Delay

RLOAD X COUT << Td (OFF)

20

µs

Td (ON)

Turn-ON Delay

RLOAD X COUT << Td (ON)

15

IS/D

S/D Input Current

VS/D =1.3V

1

µA

VS/D ≤ 0.3V

−1

AC Parameters

PSRR (VIN)

Ripple Rejection for VIN Input

VIN = VOUT +1V, f = 120 Hz

80

Voltage

VIN = VOUT + 1V, f = 1 kHz

65

dB

PSRR (VBIAS)

Ripple Rejection for VBIAS Voltage

VBIAS = VOUT + 3V, f = 120 Hz

70

VBIAS = VOUT + 3V, f = 1 kHz

65

Output Noise Density

f = 120 Hz

µV/root

−H

1

z

en

Output Noise Voltage

BW = 10 Hz

− 100 kHz

150

µV (rms)

VOUT = 1.8V

BW = 300 Hz

− 300 kHz

90

(1)

Limits are specified through testing, statistical correlation, or design.

(2)

Typical numbers represent the most likely parametric norm for 25°C operation.

(3)

Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.

(4)

Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load

to full load.

(5)

Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value. The

SOIC-8 package devices have a slightly higher dropout voltage due to increased band wire resistance.

4

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