5

LP3991

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SNVS296J – DECEMBER 2006 – REVISED JUNE 2016

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Copyright © 2006–2016, Texas Instruments Incorporated

(1)

All limits are ensured. All electrical characteristics having room-temperature limits are tested during production at TJ = 25°C or correlated

using Statistical Quality Control methods. Operation over the temperature specification is ensured by correlating the electrical

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

(2)

All voltages are with respect to the potential at the GND pin.

(3)

VIN(MIN) = VOUT(NOM) + 0.5 V or 1.65 V, whichever is greater. (See Figure 19 in DSBGA Light Sensitivity.)

(4)

The device operates with input voltages up to 4 V. However special care must be taken in relation to thermal dissipation and the need to

derate the maximum allowable ambient temperature.

(5)

The maximum ambient temperature (TA-MAX) is a suggested value dependant on the maximum operating junction temperature (TJ-MAX-

OP) = 125°C); the maximum power dissipation of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of

the part / package in the application (RθJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (RθJA × PD-MAX).

(6)

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

This parameter is only specified for output voltages above 1.8 V.

(7)

The device maintains the regulated output voltage without a load.

(8)

Short circuit current is measured with VOUT pulled to 0 V.

(9)

This electrical specification is ensured by design.

(10) EN pin has an internal 1.2-M

Ω (typical) resistor connected to GND.

6.5 Electrical Characteristics

Unless otherwise noted, VEN = 950 mV, VIN = VOUT + 0.5 V, or 1.8 V, whichever is higher, CIN = 1 µF, COUT = 4.7 µF, IOUT =

1 mA. Typical values and limits apply for TA = 25°C. Minimum and maximum limits apply over the full junction temperature

range for operation,

−40°C to +125°C, unless otherwise specified.

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage

See(2)

1.65

3.6

V

See(3)(4)(5)

4

ΔVOUT

Output voltage tolerance

VIN = VIN(NOM) to 3.6 V

ILOAD = 1 to 300 mA

TJ = 25°C

–1%

1%

–3%

3%

TJ = –25°C to 85°C

–2.5%

2.5%

Line regulation error

VIN = VOUT(NOM) 0.5 V to 3.6 V,

IOUT = 1 mA, 0.8 V ≤ VOUT ≤ 2.8 V

0.05

1

%/V

Load regulation error

IOUT = 1 mA to 300 mA

10

60

µV/mA

VDO

Dropout voltage(6)

1.8 V

≤ VOUT ≤ 2.5 V

IOUT = 150 mA

55

90

mV

IOUT = 300 mA

110

180

VOUT > 2.5 V

IOUT = 150 mA

40

80

IOUT = 300 mA

75

160

ILOAD

Minimum load current

See(7)

0

mA

IQ

Quiescent current

VEN = 950 mV, IOUT = 0 mA

50

100

µA

VEN = 950 mV, IOUT = 300 mA

120

225

VEN = 0.4 V

0.001

1

ISC

Short-circuit current limit

VIN = 3.6 V

(8)

550

900

mA

IOUT

Maximum output current

300

mA

PSRR

Power Supply Rejection Ratio(9)

ƒ = 1kHz, IOUT = 1 mA to 300 mA

65

dB

en

Output noise voltage(9)

BW = 10 Hz to 100 kHz,

VIN = 4.2 V, COUT = 4.7 µF

280

µVRMS

TSHUTDOWN Thermal shutdown

Temperature

160

°C

Hysteresis

20

ENABLE CONTROL CHARACTERISTICS

IEN

(10)

Maximum input current at VEN input

VEN = 0 V, VIN = 3.6 V

0.001

µA

VEN = VIN = 3.6 V

3

5.5

VIL

Low input threshold

VIN = 1.65 V to 3.6 V

0.4

V

VIH

High input threshold

VIN = 1.65 V to 3.6 V

0.95

V