LP38859 datasheet(3/21 Pages) TI1

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LP38859

www.ti.com

SNVS337D – JUNE 2006 – REVISED OCTOBER 2011

Operating Ratings

(1)

VIN Supply Voltage

(VOUT + VDO) to VBIAS

VBIAS Supply Voltage

3.0V to 5.5V

IOUT

0 mA to 3.0A

Junction Temperature Range(2)

−40°C to +125°C

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but does not ensure specific performance limits. For ensured specifications and conditions,

see the Electrical Characteristics.

(2)

Device power dissipation must be de-rated based on device power dissipation (PD), ambient temperature (TA), and package junction to

ambient thermal resistance (

θJA). Additional heat-sinking may be required to ensure that the device junction temperature (TJ) does not

exceed the maximum operating rating. See the Application Information section for details.

Electrical Characteristics

Unless otherwise specified: VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1 µF, CSS = open.

Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.

Symbol

Parameter

Conditions

MIN

TYP

MAX

Units

VOUT(NOM) + 1V ≤ VIN ≤ VBIAS,

-1.0

1.0

3.0V

≤ VBIAS ≤ 5.5V,

0.0

-3.0

3.0

10 mA

≤ IOUT ≤ 3A

VOUT

VOUT Accuracy

VOUT(NOM) + 1V ≤ VIN ≤ VBIAS,

3.0V

≤ VBIAS ≤ 5.5V,

-2.0

0.0

2.0

10 mA

≤ IOUT ≤ 3.0A,

0°C

≤ TJ ≤ +125°C

ΔVOUT/ΔVIN

Line Regulation, VIN

(1)

VOUT(NOM) + 1V ≤ VIN ≤ VBIAS

0.04

%/V

ΔVOUT/ΔVBIAS Line Regulation, VBIAS

(1)

3.0V

≤ VBIAS ≤ 5.5V

0.10

%/V

ΔVOUT/ΔIOUT

Output Voltage Load Regulation(2)

10 mA

≤ IOUT ≤ 3.0A

0.2

%/A

300

VDO

Dropout Voltage(3)

IOUT = 3.0A

240

450

LP38859-0.8

8.5

7.0

10 mA

≤ IOUT ≤ 3.0A

9.0

Quiescent Current Drawn from VIN

IGND(IN)

Supply

LP38859-1.2

10 mA

≤ IOUT ≤ 3.0A

Quiescent Current Drawn from

3.8

IGND(BIAS)

10 mA

≤ IOUT ≤ 3.0A

3.0

VBIAS Supply

4.5

VBIAS rising until device is

2.20

2.70

UVLO

Under-Voltage Lock-Out Threshold

2.45

functional

2.00

2.90

VBIAS falling from UVLO threshold

300

UVLO(HYS)

Under-Voltage Lock-Out Hysteresis

150

until device is non-functional

350

VIN = VOUT(NOM) + 1V,

ISC

Output Short-Circuit Current

6.2

VBIAS = 3.0V, VOUT = 0.0V

Soft-Start

LP38859-0.8

11.0

13.5

16.0

rSS

Soft-Start internal resistance

Ω

LP38859-1.2

13.5

16.0

18.5

LP38859-0.8, CSS = 10 nF

675

Soft-Start time

tSS

μs

tSS = CSS × rSS × 5

LP38859-1.2, CSS = 10 nF

800

(1)

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

(2)

Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load

to full load.

(3)

Dropout voltage is defined the as input to output voltage differential (VIN - VOUT) where the input voltage is low enough to cause the

output voltage to drop no more than 2% from the nominal value.

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