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LP3988-Q1

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SLAS928B – MARCH 2013 – REVISED NOVEMBER 2016

Product Folder Links: LP3988-Q1

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Copyright © 2013–2016, Texas Instruments Incorporated

(1)

All electrical characteristics having room-temperature limits are tested during production with TJ = 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)

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

(4)

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

(5)

Short-circuit current is measured on input supply line after pulling down VOUT to 95% VOUT(NOM).

(6)

Specified by design. Not production tested. The capacitor tolerance should be ±30% or better over the full temperature range. The full

range of operating conditions such as temperature, DC bias and even capacitor case size for the capacitor in the application must be

considered during device selection to ensure this minimum capacitance specification is met. TI recommends X7R capacitor types to

meet the full device temperature range.

6.5 Electrical Characteristics

Unless otherwise specified: VEN = 1.8 V, VIN = VOUT + 0.5 V, CIN = 1 µF, IOUT = 1 mA, COUT = 1 µF; typical values and limits

are for TJ = 25°C, and minimum and maximum values and limits apply over the entire junction temperature range for

operation,

−40°C to +125°C.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ΔVOUT

Output voltage tolerance

TJ = 25°C

−2

2

% of

VOUT(NOM)

–3.5

3.5

Line regulation error

VIN = VOUT(NOM) + 0.5 V to 6 V

TJ = 25°C

−0.15

0.15

%/V

VIN = VOUT(NOM) + 0.5 V to 6 V

–0.2

0.2

Load regulation error(3)

IOUT = 1 mA to 150 mA, TJ = 25°C

0.005

%/mA

IOUT = 1 mA to 150 mA

0.007

PSRR

Power supply rejection ratio

VIN = VOUT(NOM) + 1 V,

ƒ = 1 kHz,

IOUT = 50 mA (See Figure 15)

65

dB

VIN = VOUT(nom) + 1 V,

ƒ = 10 kHz, IOUT = 50 mA

(See Figure 15)

45

IQ

Quiescent current

VEN = 1.4 V, IOUT = 0 mA, TJ = 25°C

85

120

µA

VEN = 1.4 V, IOUT = 0 to 150 mA

140

200

VEN = 0.4 V

0.003

1

VDO

Dropout voltage(4)

IOUT = 1 mA

1

5

mV

IOUT = 150 mA, TJ = 25°C

80

115

IOUT = 150 mA

150

ISC

Short-circuit current limit

See(5)

600

mA

en

Output noise voltage

BW = 10 Hz to 100 kHz,

COUT = 1 µF

220

µVRMS

COUT

Output capacitor

Capacitance(6)

1

20

µF

ESR(6)

5

500

m

Ω

TSD

Thermal shutdown

temperature

160

°C

Thermal shutdown hysteresis

20

ENABLE CONTROL CHARACTERISTICS

IEN

Maximum input current at EN

VEN = 0 V and VIN = 6 V

0.1

µA

VIL

Logic low input threshold

VIN = 2.5 V to 6 V

0.5

V

VIH

Logic high input threshold

VIN = 2.5 V to 6 V

1.2

V