LP3856ES-ADJSLASHNOPB datasheet(4/22 Pages) TI

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LP3856-ADJ

SNVS243E – SEPTEMBER 2003 – REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS — LP3856-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.

LP3856-ADJ(2)

Symbol

Parameter

Conditions

Typ (1)

Units

Min

Max

1.198

1.234

VADJ

Adjust Pin Voltage

VOUT +1V ≤ VIN≤ 7V, 10 mA ≤ IL ≤ 3A

1.216

1.180

1.253

IADJ

Adjust Pin Input Current

VOUT +1V ≤ VIN≤ 7V, 10 mA ≤ IL ≤ 3A

100

0.02

ΔV OL

Output Voltage Line Regulation (3)

VOUT +1V ≤ VIN≤ 7.0V

0.06

ΔVO/

0.08

Output Voltage Load Regulation(3)

10 mA

≤ IL ≤ 3A

ΔIOUT

0.14

IL = 300 mA

VIN - VOUT Dropout Voltage

(4)

500

IL = 3A

390

700

IL = 300 mA

Ground Pin Current In Normal

IGND

Operation Mode

IL = 3A

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%

4.5

Short Circuit Protection

ISC

Short Circuit Current

Shutdown Input

VSDT Rising from 0.3V until Output = ON

1.3

VSDT

Shutdown Threshold

VSDT Falling from 2.0V until Output = OFF

1.3

0.3

TdOFF

Turn-off delay

IL = 3A

µs

TdON

Turn-on delay

IL = 3A

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

µV

Output Noise Voltage

(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 verified 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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