LP3990-Q1

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SNVSA66A – OCTOBER 2014 – REVISED DECEMBER 2015

6.5 Electrical Characteristics

Unless otherwise noted, VEN = 950 mV, VIN = VOUT + 1 V or VIN = 2 V, whichever is higher. CIN = 1 µF, IOUT = 1 mA, COUT =

0.47 µF.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage

See(3)

2

6

V

ILOAD = 1 mA, TJ = 25°C

–1%

1%

Output voltage tolerance

Over full line and load regulation

–2.5%

2.5%

ΔVOUT

Line regulation error

VIN = (VOUT(NOM) + 1 V) to 6 V

0.1

0.02

0.1

%/V

VOUT = 0.8 V to 1.95 V

–0.005

0.002

0.005

IOUT = 1 mA

Load regulation error

%/mA

to 150 mA

VOUT = 2 V to 3.3 V

–0.002

0.0005

0.002

VDO

Dropout voltage

IOUT = 150 mA, see

(4) (5)

120

200

mV

ILOAD

Load current

TJ = 25°, see

(5) (6)

0

µA

VEN = 950 mV, IOUT = 0 mA

43

80

IQ

Quiescent current

VEN = 950 mV, IOUT = 150 mA

65

120

µA

VEN = 0.4 V (output disabled), TJ = 25°C

0.002

0.2

ISC

Short circuit current limit

See(7)

550

1000

mA

IOUT

Maximum output current

150

ƒ = 1 kHz, IOUT = 1 mA to 150 mA

55

Power Supply Rejection

PSRR

dB

Ratio

ƒ = 10 kHz, IOUT = 150 mA

35

VOUT = 0.8 V

60

BW = 10 Hz to 100

eη

Output noise voltage(5)

VOUT = 1.5 V

125

µVRMS

kHz

VOUT = 3.3 V

180

Junction temperature (TJ) rising until the output

155

Thermal shutdown

is disabled

TSHUTDOWN

°C

junction temperature

Hysteresis

15

ENABLE CONTROL CHARACTERISTICS

VEN = 0 V (Output is disabled)

0.001

0.1

Maximum input current

TJ = 25°C

IEN

(8)

µA

at EN pin

VEN = 6 V

2.5

6

10

VIN = 2 V to 6 V

VIL

Low input threshold

0.4

VEN falling from ≥ VIH until the output is disabled

V

VIN = 2 V to 6 V

VIH

High input threshold

0.95

VEN rising from ≤ VIL until the output is enabled

(1)

All voltages are with respect to the device GND terminal, unless otherwise stated.

(2)

Minimum and Maximum limits are ensured through test, design, or statistical correlation over the operating junction temperature range

(TJ) of –40°C to 125°C, unless otherwise stated. Typical values represent the most likely parametric norm at TJ = 25°C, and are

provided for reference purposes only.

(3)

VIN(MIN) = VOUT(NOM) + 0.5 V, or 2 V, whichever is higher.

(4)

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

This parameter applies only for output voltages above 2 V.

(5)

This electrical specification is verified by design.

(6)

The device maintains the regulated output voltage without the load.

(7)

Short-circuit current is measured with VOUT pulled to 0 V and VIN worst case = 6 V.

(8)

ENABLE pin has 1-M

Ω (typical) resistor connected to GND.

6.6 Output Capacitor, Recommended Specifications

See

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Capacitance(2)

0.7(3)

1

500

µF

COUT

Output capacitance

ESR

5

m

Ω

(1)

Unless otherwise specified, values and limits apply for TJ = 25°C.

(2)

The full operating conditions for the application must be considered when selecting a suitable capacitor to ensure that the minimum

value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R, Y5V, and Z5U can

also be used. (See Detailed Design Procedure.)

(3)

Limit applies over the full operating junction temperature range (TJ) of −40°C to 125°C.

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