LP5951

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SNVS345G – JUNE 2006 – REVISED DECEMBER 2014

6.5 Electrical Characteristics

All typical (TYP) values and limits are for TA = TJ = 25°C, and minimum (MIN) and maximum (MAX) limits apply over the

operating junction temperature range (TJ ) of –40°C to 125°C unless otherwise specified in the Test Conditions. Unless

otherwise noted, VIN = VOUT(NOM) + 1 V, CIN = 1 µF, COUT = 1 µF, VEN = 0.9 V.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage

VIN ≥ VOUT(NOM) + VDO

1.8

5.5

V

IOUT = 1mA

–2%

2%

TJ = 25°C

Output voltage tolerance

IOUT = 1mA

–3.5%

3.5%

–30°C

≤ TJ ≤ +125°C

ΔVOUT

Line regulation error

VIN = VOUT(NOM) + 1 V to 5.5 V

0.1

%/V

IOUT = 1 mA

Load regulation error

IOUT = 1 mA to 150 mA

–0.01

%/mA

VDO

Output voltage dropout(3)

IOUT = 150 mA , VOUT ≥ 2.5 V

250

mV

IOUT = 150 mA , VOUT < 2.5 V

200

350

IQ

Quiescent current

VEN = 0.9 V, ILOAD = 0

29

55

µA

VEN = 0.9 V, ILOAD = 150 mA

33

70

VEN = 0 V, TJ = 25°C

0.005

1

ISC

Output current (short circuit)

VIN = VOUT(NOM) + 1 V

150

400

mA

Sine modulated VIN, ƒ = 100 Hz

60

PSRR

Power supply rejection ratio

Sine modulated VIN, ƒ = 1 kHz

60

dB

Sine modulated VIN, ƒ = 10 kHz

50

EN

Output noise

BW = 10 Hz - 100 kHz

125

µVRMS

TSD

Thermal shutdown

160

°C

Temperature hysteresis

20

(1)

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

(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)

Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100 mV below the nominal output

voltage. This specification does not apply for output voltages below 1.8 V.

6.6 Enable Control Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IEN

Maximum input current at

0 V

≤ VEN ≤ VIN, VIN = 5.5 V

–1

1

µA

EN input

–40°C

≤ TJ ≤ 125°C

Low input threshold

VIN = 1.8 V to 5.5 V

VIL

0.4

(shutdown)

–40°C

≤ TJ ≤ 125°C

V

VIH

High input threshold

VIN = 1.8 V to 5.5 V

0.9

(enable)

–40°C

≤ TJ ≤ 125°C

6.7 Transient Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ΔVOUT

Dynamic line transient

VIN = VOUT(NOM) + 1 V to

±2

mV

VOUT(NOM) + 1 V + 0.6 V in 30 µs, no load

IOUT = 0 mA to 150 mA in 10 µs

-30

mV

IOUT = 150 mA to 0 mA in 10 µs

20

mV

ΔVOUT

Dynamic load transient

IOUT = 1 mA to 150 mA in 1 µs

-50

mV

IOUT = 150 mA to 1 mA in 1 µs

40

mV

ΔVOUT

Overshoot on start-up

Nominal conditions

10

mV

TON

Turnon time

IOUT = 1 mA

30

µs

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