LP38869

SNVS877B – AUGUST 2012 – REVISED APRIL 2013

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Electrical Characteristics (continued)

Unless otherwise specified: VIN = VOUT(NOM) + 500 mV, VSHDN = VIN, IOUT = 10 mA, CIN = 1 μF MLCC, COUT = 1 μF MLCC, SS =

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

IOUT = 100 µA

-

0.6

2

IGND

Ground Pin Current

mA

IOUT = 1A

-

0.7

-

IOFF

Shutdown Supply Current

VSHDN = 0.0V, VIN = +5.5V, VOUT = 0V

-

2

20

µA

Adjustable Output Voltage Range

1 mA

≤ IOUT ≤ 1 A

0.8

-

5

V

IOUT(MAX)

Maximum Output Current

Continuous

1.0

-

-

A

ISC

Short Circuit Current

VOUT = 0V

1.0

1.9

-

A

VSET = 0.760V, -40°C ≤ TJ ≤ 85°C

2.0

ILIM

In Regulation Current Limit

3

-

A

VSET = 0.760V

1.9

Threshold is where SET pin voltage rising

VSET(TH)

SET Dual Mode Threshold

35

87

138

mV

from 0.0V deactivates the Pre-Set Mode

ISET

SET Pin Bias Current

VSET = +0.900V

-

2

300

nA

IOUT = 1 mA

-

0.2

-

VDO

Dropout Voltage (3)

mV

IOUT = 1.0A

-

185

330

VSHDN rising until output is acitve

VSHDN(ON)

SHDN ON Threshold

1.60

0.86

-

+2.7V

≤ VIN ≤ +5.5V

V

VSHDN falling until output is shutdown

VSHDN(OFF)

SHDN OFF Threshold

-

0.78

0.58

+2.7V

≤ VIN ≤ +5.5V

ΔVSHDN

VSHDN Hysteresis

+2.7V

≤ VIN ≤ +5.5V

-

80

-

mV

VSHDN = 0V

-

0.002

0.1

ISHDN

SHDN Input Bias Current

µA

VSHDN = 5.5V

-

0.002

0.1

ISS

Soft-Start Charge Current

VSS= 0.0V

-

6.7

-

µA

RST Output Low Voltage

IRST(SINK) = 1 mA

-

0.007

0.1

V

Operating Input Voltage (VIN)

IRST(SINK) = 10 μA

1.0

-

5.5

V

Range for RST Valid

IRST

RST Leakage

VIN = 5.5V, VRST = 5.5V

-

0.0

1

µA

VOUT falling from VOUT(NOM) until RST pin

%

VRST(TH)

RST Threshold

86

92

97

goes low

OUT

VOUT rising from VRST(TH) until RST pin goes

ΔVRST

RST Hysteresis

-

10

-

mV

high

Time from when VOUT returns to normal to

tRST(DELAY)

RST Release Delay time

1.0

3

5.5

ms

when VRST goes high

AC Parameters

F = 100 kHz, COUT = 1 µF Ceramic,

PSRR

Ripple Rejection

-

54

-

dB

IOUT = 300 mA

f = 10Hz to 100 kHz, COUT = 1µF Ceramic,

VNOISE

Output Noise

-

50

-

µVRMS

IOUT = 150 mA

Thermal Characteristics

TSD

Thermal Shutdown

TJ rising

-

160

-

°C

ΔTSD

Thermal Shutdown Hysteresis

TJ falling from TSD

-

15

-

(3)

Dropout voltage (VDO) is defined as the minimum input to output differential voltage at which the output voltage drops to 100 mV below

the nominal value. For any output voltage less than 2.5V, the minimum VIN operating voltage of 2.7V is the limiting factor, and dropout

voltage is not a valid parameter.

4

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