LP3873 datasheet(4/24 Pages) TI

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LP3873, LP3876

SNVS220E – NOVEMBER 2002 – REVISED APRIL 2013

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Electrical Characteristics

LP3873/LP3876

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) + 1.5V, IL = 10 mA, COUT = 10µF, VSD = 2V.

Symbol

Parameter

Conditions

Typ(1)

LP3873/6(2)

Units

Min

Max

Output Voltage Tolerance(3)

VOUT +1.5V ≤ VIN ≤ 7.0V

-1.5

+1.5

10 mA

≤ IL ≤ 3A

-3.0

+3.0

ΔV OL

Output Voltage Line

VOUT + 1.5V ≤ VIN ≤ 7.0V

0.02

Regulation(3)

0.06

ΔVO/ ΔIOUT

Output Voltage Load

10 mA

≤ IL ≤ 3A

0.08

Regulation(3)

0.14

VIN - VOUT

IL = 300 mA

100

120

Dropout Voltage(4)

IL = 3A

800

1000

1200

IL = 300 mA

Ground Pin Current In Normal

IGND

Operation Mode

IL = 3A

IGND

Ground Pin Current In

VSD ≤ 0.3V

µA

Shutdown Mode

-40°C

≤TJ ≤ 85°C

IO(PK)

Peak Output Current

VO ≥ VO(NOM) - 4%

4.5

SHORT CIRCUIT PROTECTION

ISC

Short Circuit Current

SHUTDOWN INPUT

Output = High

VIN

VSDT

Shutdown Threshold

Output = Low

0.3

TdOFF

Turn-off delay

IL = 3A

µs

TdON

Turn-on delay

IL = 3A

µs

ISD

SD Input Current

VSD = VIN

ERROR FLAG

Threshold

See(5)

VTH

Threshold Hysteresis

See(5)

VEF(Sat)

Error Flag Saturation

Isink = 100µA

0.02

0.1

Flag Reset Delay

µs

Ilk

Error Flag Pin Leakage

Current

Imax

Error Flag Pin Sink Current

VError = 0.5V

(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. The line

and load regulation specification contains only the typical number. However, the limits for line and load regulation are included in the

output voltage tolerance specification.

(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)

Error Flag threshold and hysteresis are specified as percentage of regulated output voltage. See Application Hints.

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