LP38788, LP38788-ADJ

SNVS802B – APRIL 2012 – REVISED OCTOBER 2012

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Electrical Characteristics

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

range of -40°C to +125°C. Minimum and Maximum limits are guaranteed 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. Unless

otherwise stated the following conditions apply: VIN = 5.5V, VSET = 5.00V, CCP= 10 nF, CIN = 10 μF 50mΩ Tantalum, COUT =

10

μF X7R MLCC, IOUT = 10 mA, and TJ = 25°C.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

1.188

1.212

(-1%)

(+1%)

VFB

Feedback Voltage

1.200

V

1.176

1.224

5.5V

≤ VIN ≤ 15.0V

(-2%)

(+2%)

VOS

Voltage Offset

VOUT - VSET

0

3

25

mV

IFB

Feedback Pin Current

VFB = 1.200V

-

0

1

µA

VIN = 4.5V, VSET = 4.00V

-

46

-

SET Pin Internal

ISET

VIN = 5.5V, VSET = 5.00V

28.0

52

76.0

μA

Current Sink

VIN = 12.5V, VSET = 12.0V

-

71

-

Line Regulation

5.5V

≤ VIN ≤ 15.0V

ΔVOUT / ΔVIN

-

0.005

-

%/V

(1)

IOUT = 10mA

Load Regulation

VIN = 5.5V

ΔVOUT / ΔIOUT

-

-0.2

-

%/A

(2)

10 mA

≤ IOUT ≤ 800 mA

Dropout Voltage

VDO

IOUT = 800 mA

-

250

565

mV

(3)

Under-Voltage Lock-

UVLO

VIN Rising

2.31

2.65

3.00

V

Out

ΔUVLO

UVLO Hysteresis

VIN Falling from UVLO threshold

-

180

-

mV

Ground Pin Current

IGND

IOUT = 800mA

-

1.2

5.0

mA

(4)

Ground Pin Current,

IQ

Quiescent

IOUT = 0 mA

-

1.3

5.0

mA

(4)

Ground Pin Current,

ISD

Shutdown

VEN = 0.0V

-

6.7

20.0

µA

(4)

ISC

Short Circuit Current

RLOAD = 0Ω

540

1100

2000

mA

CP Pin Voltage above

ΔVCP

VCP - VIN

-

2.8

-

V

VIN

tSTART

Start-up Time

From VEN > VEN(ON) to VOUT ≥ 98% of VOUT(NOM)

-

150

250

µs

VIN = 5.00V, VOUT = 4.70V, f = 10 kHz

-

60

-

Power Supply

PSRR

VIN = 5.00V, VOUT = 4.70V, f = 100 kHz

-

23

-

dB

Rejection Ratio

VIN = 5.00V, VOUT = 4.70V, f = 1 MHz

-

33

-

Output Noise Voltage

VIN = 5.5V, VOUT = 5.00V

eN

-

4

-

µV(RMS)

(RMS)

BW = 10 Hz to 100 kHz

ENABLE INPUT

Enable ON Threshold

VEN(ON)

VEN rising from 0.50V until Output is ON

1.05

1.25

1.45

V

Voltage

Enable Threshold

ΔVEN

VEN Falling from VEN(ON) until Output is OFF

-

100

-

mV

Voltage Hysteresis

EN Pin Low Bias

IEN(IL)

VEN = 500 mV

-

2

3.0

µA

Current

EN Pin High Bias

IEN(IH)

VEN = 2.0V

-

2

3.0

µA

Current

(1)

Line Regulation: % change in VOUT(NOM) for every 1V change in VIN= (( ΔVOUT / VOUT(NOM)) / ΔVIN ) x 100%

(2)

Load Regulation: % change in VOUT(NOM) for every 1A change in IOUT = (( ΔVOUT / VOUT(NOM) ) / ΔIOUT ) x 100%

(3)

Dropout voltage (VDO) is defined as the differential voltage measured between VOUT and VIN when VIN, falling from VIN = VOUT + 1V,

causes VOUT to drop 2% below the value measured with VIN = VOUT + 1V.

(4)

Ground pin current is the sum of the current in both GND pins (Pin 4 + Pin 5) only, and does not include current from the SET pin.

4

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