LM2990_15 datasheet(5/24 Pages) TI

Teilenummer	LM2990

Bauteilbeschribung	LM2990 Negative Low-Dropout Regulator

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LM2990

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SNVS093G – JUNE 1999 – REVISED MAY 2015

6.5 Electrical Characteristics: –5 V and –5.2 V

VIN = −5 V + VOUT(NOM)

(1), I

OUT = 1 A, COUT = 47 μF, unless otherwise specified. All limits apply for TJ = 25°C, unless otherwise

indicated in the Test Conditions.

LM2990 –5V

LM2990 –5.2V

PARAMETER

TEST CONDITIONS

UNIT

MIN(2)

TYP(3)

MAX(2)

MIN(2)

TYP(3)

MAX(2)

5 mA

≤ IOUT ≤ 1 A

−5.1

–5

–4.9

−5.3

–5.2

–5.1

V

Output voltage

5 mA

≤ IOUT ≤ 1 A

(VOUT)

–5.25

–5

−4.75

–5.46

–5.2

–4.94

V

−40°C ≤ TJ ≤ 125°C

IOUT = 5 mA,

Line regulation

4

40

4

40

mV

VO(NOM) −1 V > VIN > −26 V

Load regulation

50 mA

≤ IOUT ≤ 1 A

1

40

1

40

mV

IOUT = 0.1 A, ΔVOUT ≤ 100 mV

0.1

0.3

0.1

0.3

V

−40°C ≤ TJ ≤ 125°C

Dropout voltage

IOUT = 1 A, ΔVOUT ≤ 100 mV

0.6

1

0.6

1

V

−40°C ≤ TJ ≤ 125°C

IOUT ≤ 1 A

1

5

1

5

Quiescent

mA

current (Iq)

IOUT = 1 A, VIN = VOUT(NOM)

9

50

9

50

Short circuit

RL = 1 Ω

(4)

1.5

1.8

1.5

1.8

A

current

Maximum output

See(4)

1.5

1.8

1.5

1.8

A

current

Ripple rejection

Vripple = 1 Vrms,

50

58

50

58

dB(min)

ƒripple = 1 kHz, IOUT = 5 mA

Output noise

10 Hz to 100 kHz, IOUT = 5 mA

μV(max)

250

750

250

750

voltage

Long-term

1000 Hours

ppm

2000

stability

(1)

VOUT(NOM) is the nominal (typical) regulator output voltage, −5 V, −5.2 V, −12 V or −15 V.

(2)

Limits are specified and 100% production tested.

(3)

Typicals are at TJ = 25°C and represent the most likely parametric norm.

(4)

The short circuit current is less than the maximum output current with the

−12 V and −15 V versions due to internal foldback current

limiting. The

−5 V and −5.2 V versions, tested with a lower input voltage, does not reach the foldback current limit and therefore

conducts a higher short circuit current level. If the LM2990 output is pulled above ground, the maximum allowed current sunk back into

the LM2990 is 1.5 A.

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