LP3855-ADJ

SNVS244F – SEPTEMBER 2003 – REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS — LP3855-ADJ

Symbol

Parameter

Conditions

Units

Min

Max

1.198

1.234

Adjust Pin Voltage

1.216

V

10 mA

1.180

1.253

Adjust Pin Input Current

10

100

nA

10 mA

Output Voltage Line

0.02

%

0.06

Output Voltage Load

0.06

10 mA

%

0.12

35

24

Dropout Voltage,

45

DDPAK/TO-263 and TO-

310

240

mV

420

35

26

45

Dropout Voltage,

320

260

435

9

3

10

Ground Pin Current In

mA

Normal Operation Mode

9

3

10

0.01

10

Ground Pin Current In

µA

Shutdown Mode

-40°C

50

Peak Output Current

1.8

A

Short Circuit Protection

Short Circuit Current

3.2

A

Shutdown Input

1.3

2

until Output = ON

Shutdown Threshold

V

1.3

0.3

until Output = OFF

Turn-off delay

20

µs

Turn-on delay

25

µs

SD Input Current

1

nA

AC Parameters

73

PSRR

Ripple Rejection

dB

57

Output Noise Density

f = 120Hz

0.8

µV

150

Output Noise Voltage

µV (rms)

100

(1)

Typical numbers are at 25°C and represent the most likely parametric norm.

(2)

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

(3)

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

Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current.

(4)

Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.

Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is

nothing but the input to output differential, since the minimum input voltage is 2.5V.

(5)

The SOT-223 package devices have slightly higher dropout due to increased bond wire resistance.

4

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