LP3985

www.ti.com

SNVS087AE – OCTOBER 2000 – REVISED MAY 2015

6.5 Electrical Characteristics

Unless otherwise specified: VIN = VOUT(nom) + 0.5 V, CIN = 1 μF, IOUT = 1 mA, COUT = 1 μF, CBYPASS = 0.01 μF. Minimum (MIN)

and Maximum (MAX) values apply over –40°C

≤ TJ ≤ 125°C and typical values are TA = 25°C, unless otherwise indicated.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

–2(3)

2(3)

% of

Output voltage tolerance

IOUT = 1 mA

–3

3

VOUT(nom)

VIN = (VOUT(nom) + 0.5 V) to 6 V,

Line regulation error

For 4.7-V to 5-V options

–0.19

0.19

%/V

ΔVOUT

For all other options

–0.1

0.1

IOUT = 1 mA to 150 mA

0.0025

0.005

%/mA

LP3985IM5 (SOT23-5)

Load regulation error(4)

LP3985 (DSBGA)

0.0004

0.002

%/mA

VIN = VOUT(nom) + 1 V,

Output AC line regulation

1.5

mVP-P

IOUT = 150 mA (Figure 1)

VIN = VOUT(nom) + 0.2 V,

f = 1 kHz,

50

dB

IOUT = 50 mA (Figure 2)

PSRR

Power supply rejection ratio

VIN = VOUT(nom) + 0.2 V,

ƒ = 10 kHz,

40

dB

IOUT = 50 mA (Figure 2)

VEN = 1.4 V, IOUT = 0 mA

For 4.7-V to 5-V options

100

165

For all other options

85

150

IQ

Quiescent current

VEN = 1.4 V, IOUT = 0 to 150 mA

µA

For 4.7-V to 5-V options

155

250

For all other options

140

200

VEN = 0.4 V

0.003

1.5

IOUT = 1 mA

0.4

2

mV

IOUT = 50 mA

20

35

mV

Dropout voltage(5)

IOUT = 100 mA

45

70

mV

IOUT = 150 mA

60

100

mV

Output Grounded

ISC

Short circuit current limit

600

mA

(Steady State)

IOUT(PK)

Peak output current

VOUT ≥ VOUT(nom) – 5%

300

550

mA

TON

Turnon time(6)

CBYPASS = 0.01 µF

200

µs

BW = 10 Hz to 100 kHz,

Output noise voltage(7)

30

µVRMS

COUT = 1 µF

en

Output noise density

CBP = 0

230

nV/

√Hz

IEN

Maximum input current at EN VEN = 0.4 V and VIN = 6 V

±1

nA

Maximum low-level input

V

VIL

VIN = 2.5 V to 6 V

0.4

voltage at EN

Minimum high-level input

V

VIH

VIN = 2.5 V to 6 V

1.4

voltage at EN

Thermal shutdown

°C

160

temperature

TSD

Thermal shutdown hysteresis

20

°C

(1)

All limits are verified. All electrical characteristics having room-temperature limits are tested during production with TA = 25°C or

correlated using Statistical Quality Control (SQC) methods. All hot and cold limits are specified by correlating the electrical

characteristics to process and temperature variations and applying statistical process control.

(2)

The target output voltage, which is labeled VOUT(NOM), is the desired voltage option.

(3)

TA = 25°C only.

(4)

An increase in the load current results in a slight decrease in the output voltage and vice versa.

(5)

Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification

does not apply for input voltages below 2.5V.

(6)

Turnon time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal

value.

(7)

The output noise varies with output voltage option. The 30 µVRMS is measured with 2.5-V voltage option. To calculate an approximated

output noise for other options, use the equation: (30µVRMS)(X)/2.5, where X is the voltage option value.

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: LP3985