LP38511

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SNOSAU6E – NOVEMBER 2007 – REVISED APRIL 2013

OPERATING RATINGS

(1) (continued)

Junction Temperature(2)

−40°C to +125°C

(2)

Device operation must be evaluated, and derated as needed, based on ambient temperature (TA), power dissipation (PD), maximum

allowable operating junction temperature (TJ(MAX)), and package thermal resistance (θJA).

ELECTRICAL CHARACTERISTICS

Unless otherwise specified: VIN = 2.5V, IOUT = 10 mA, CIN = 10 µF, COUT = 10 µF, VEN = VIN. 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

2.25V

≤ VIN ≤ 5.5V

-1.0

+1.0

VOUT

Output Voltage Tolerance(1)

0

%

10 mA

≤ IOUT ≤ 800 mA

−2.5

+2.5

Output Voltage Line

0.02

ΔVOUT/ΔVIN

2.25V

≤ VIN ≤ 5.5V

-

-

%/V

Regulation(1)(2)

0.06

Output Voltage Load

0.25

ΔVOUT/ΔIOUT

10 mA

≤ IOUT ≤ 800 mA

-

-

%/A

Regulation(1)(3)

0.40

225

VDO

Dropout Voltage(4)

IOUT = 800 mA

-

135

mV

260

IOUT = 10 mA

11

-

7.5

12

ERROR pin = GND

Ground Pin Current, Output

mA

Enabled

IOUT = 800 mA

13

IGND

-

9.5

14

ERROR pin = GND

VEN = 0.50V

Ground Pin Current, Output

3.5

-

0.1

µA

Disabled

12

ERROR pin = GND

ISC

Short Circuit Current

VOUT = 0V

-

1.5

-

A

Enable Input

VEN rising from 0.50V until

0.90

1.50

VEN(ON)

Enable ON Threshold

1.20

V

VOUT = ON

0.80

1.60

VEN falling from 1.60V until

0.60

1.40

VEN(OFF)

Enable OFF Threshold

1.00

V

VOUT = OFF

0.50

1.50

VEN(HYS)

Enable Hysteresis

VEN(ON) - VEN(OFF)

-

200

-

mV

Time from VEN < VEN(OFF) to VOUT =

td(OFF)

Turn-off delay

-

1

-

OFF, ILOAD = 1.5A

µs

Time from VEN >VEN(ON) to VOUT =

td(ON)

Turn-on delay

-

25

-

ON, ILOAD = 800 mA

VEN = VIN

-

1

-

IEN

Enable Pin Current

nA

VEN = 0V

-

-1

-

ERROR Flag

VOUT rising threshold where ERROR

78

90

98

Flag goes high

VTH

Error Flag Threshold(5)

%

VOUT falling threshold where

74

85

93

ERROR Flag goes low

VERROR(SAT)

ERROR Flag Saturation Voltage ISINK = 1 mA

-

12.5

45

mV

ERROR Flag Pin Leakage

Ilk

VERROR = 5.5V

-

1

-

nA

Current

td

ERROR Flag Delay time

-

1

-

µs

(1)

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.

(2)

Output voltage line regulation is defined as the change in output voltage from the nominal value (

ΔVOUT) due to a change in the voltage

at the input (

ΔVIN).

(3)

Output voltage load regulation is defined as the change in output voltage from the nominal value (

ΔVOUT) due to a change in the load

current at the output (

ΔIOUT).

(4)

Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value. For

the LP38511-1.8, the minimum VIN operating voltage is the limiting factor.

(5)

The ERROR Flag thresholds are specified as percentage of the nominal regulated output voltage. See APPLICATION INFORMATION.

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