LP3872 datasheet(5/28 Pages) TI1

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LP3872, LP3875

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SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015

6.5 Electrical Characteristics

Unless otherwise specified: TJ = 25°C, VIN = VO(NOM) + 1 V, IL = 10 mA, COUT = 10 µF, VSD = 2 V.

PARAMETER

TEST CONDITIONS

MIN(1)

TYP(2)

MAX(1)

UNIT

Output voltage tolerance (3)

VOUT +1 V ≤ VIN ≤ 7 V, 10 mA ≤ IL ≤ 1.5 A

–1.5%

1.5%

VOUT

VOUT +1 V ≤ VIN ≤ 7 V, 10 mA ≤ IL ≤ 1.5 A,

–3%

–40°C

≤ TJ ≤ 125°C

Output voltage line regulation (3)

VOUT + 1 V ≤ VIN ≤ 7 V

0.02%

ΔVOL

VOUT + 1 V ≤ VIN ≤ 7 V, –40°C ≤ TJ ≤ 125°C

0.06%

Output voltage load regulation (3)

10 mA

≤ IL ≤ 1.5 A

0.06%

ΔVO/

ΔIOUT

10 mA

≤ IL ≤ 1.5 A, –40°C ≤ TJ ≤ 125°C

0.12%

IL = 150 mA

IL = 150 mA, –40°C ≤ TJ ≤ 125°C

VIN -

Dropout voltage (4)

VOUT

IL = 1.5 A

380

450

IL = 1.5 A, –40°C ≤ TJ ≤ 125°C

550

IL = 150 mA

IL = 150 mA,–40°C ≤ TJ ≤ 125°C

Ground pin current in normal

IGND

operation mode

IL = 1.5 A

IL = 1.5 A, –40°C ≤ TJ ≤ 125°C

Ground pin current in shutdown

VSD ≤ 0.3 V

0.01

µA

IGND

mode

–40°C

≤ TJ ≤ 85°C

IO(PK)

Peak output current

VOUT ≥ VO(NOM) – 4%

1.8

SHORT CIRCUIT PROTECTION

ISC

Short-circuit current

3.2

SHUTDOWN INPUT

Output = High

VIN

Output = High, –40°C

≤ TJ ≤ 125°C

VSDT

Shutdown threshold

Output = Low

Output = Low, –40°C

≤ TJ ≤ 125°C

0.3

TdOFF

Turnoff delay

IL = 1.5 A

µs

TdON

Turnon delay

IL = 1.5 A

µs

ISD

SD input current

VSD = VIN

ERROR FLAG

Threshold

See(5)

10%

See(5), –40°C

≤ TJ ≤ 125°C

16%

Threshold hysteresis

See(5)

VTH

See(5), –40°C

≤ TJ ≤ 125°C

ERROR flag saturation

Isink = 100 µA

0.02

VEF(Sat)

Isink = 100 µA, –40°C ≤ TJ ≤ 125°C

0.1

Flag reset delay

µs

Ilk

ERROR flag pin leakage current

Imax

ERROR flag pin sink current

VError = 0.5 V

(1)

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

(2)

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

(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 2.5 V and above. For output voltages below 2.5 V, the dropout voltage is

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

(5)

ERROR Flag threshold and hysteresis are specified as percentage of regulated output voltage. See ERROR Flag Operation.

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