LP3875-ADJ datasheet(4/20 Pages) TI

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LP3875-ADJ

SNVS247D – SEPTEMBER 2003 – REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS — LP3875-ADJ

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, IL = 10 mA, COUT = 10µF, VSD = 2V.

Typ (1)

LP3875-ADJ (2)

Symbol

Parameter

Conditions

Units

Min

Max

VOUT +1V ≤ VIN ≤ 7V

1.198

1.234

VADJ

Adjust Pin Voltage

1.216

10 mA

≤ IL ≤ 1.5A

1.180

1.253

VOUT +1V ≤ VIN≤ 7V

IADJ

Adjust Pin Input Current

100

10 mA

≤ IL ≤ 1.5A

0.02

ΔVOL

Output Voltage Line Regulation (3)

VOUT +1V ≤ VIN ≤ 7.0V

0.06

ΔVO/ ΔIOUT

Output Voltage Load Regulation (3) 10 mA

≤ IL ≤ 1.5A

0.12

IL = 150 mA

VIN - VOUT

Dropout Voltage (4)

450

IL = 1.5A

380

550

IL = 150 mA

Ground Pin Current In Normal

IGND

Operation Mode

IL = 1.5A

VSD ≤ 0.3V

0.01

Ground Pin Current In Shutdown

IGND

µA

Mode

-40°C

≤ TJ ≤ 85°C

IO(PK)

Peak Output Current

VO ≥ VO(NOM) - 4%

1.8

Short Circuit Protection

ISC

Short Circuit Current

3.2

Shutdown Input

Output = High

VIN

VSDT

Shutdown Threshold

Output = Low

0.3

TdOFF

Turn-off delay

IL = 1.5A

µs

TdON

Turn-on delay

IL = 1.5A

µs

ISD

SD Input Current

VSD = VIN

AC Parameters

VIN = VOUT + 1V

COUT = 10uF

VOUT = 3.3V, f = 120Hz

PSRR

Ripple Rejection

VIN = VOUT + 0.5V

COUT = 10uF

VOUT = 3.3V, f = 120Hz

ρn(l/f)

Output Noise Density

f = 120Hz

0.8

µV

BW = 10Hz – 100kHz, VOUT = 2.5V

150

Output Noise Voltage

µV (rms)

BW = 300Hz – 300kHz, VOUT = 2.5V

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.

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