Datasheet

LM2990
SNVS093D –JUNE 1999–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
V
IN
= −5V + V
O(NOM)
(1)
, I
O
= 1A, C
O
= 47 μF, unless otherwise specified. Boldface limits apply over the entire operating
temperature range, −40°C ≤ T
J
≤ 125°C, all other limits apply for T
J
= 25°C.
LM2990-12 LM2990-15
Units
Parameter Conditions
(Limit)
Typ
(2)
Limit
(3)
Typ
(2)
Limit
(3)
Output Voltage (V
O
) −11.76 −14.70 V (max)
5 mA ≤ I
O
≤ 1A
−12.24 −15.30 V (min)
−12 −15 V
5 mA ≤ I
O
≤ 1A −11.40 −14.25 V (max)
−12.60 −15.75 V (min)
Line Regulation I
O
= 5 mA,
6 60 6 60 mV (max)
V
O(NOM)
−1V > V
IN
> −26V
Load Regulation 50 mA ≤ I
O
≤ 1A 3 50 3 50 mV (max)
Dropout Voltage I
O
= 0.1A, ΔV
O
≤ 100 mV 0.1 0.3 0.1 0.3 V (max)
I
O
= 1A, ΔV
O
≤ 100 mV 0.6 1 0.6 1 V (max)
Quiescent Current (I
q
) I
O
≤ 1A 1 5 1 5 mA (max)
I
O
= 1A, V
IN
= V
O(NOM)
9 50 9 50 mA (max)
Short Circuit Current R
L
= 1Ω
(4)
1.2 0.9 1.0 0.75 A (min)
Maximum Output Current See
(4)
1.8 1.4 1.8 1.4 A (min)
Ripple Rejection V
ripple
= 1 V
rms
,
52 42 52 42 dB (min)
ƒ
ripple
= 1 kHz, I
O
= 5 mA
Output Noise Voltage 10 Hz–100 kHz, I
O
= 5 mA 500 1500 600 1800 μV (max)
Long Term Stability 1000 Hours 2000 2000 ppm
(1) V
O(NOM)
is the nominal (typical) regulator output voltage, −5V, −5.2V, −12V or −15V.
(2) Typicals are at T
J
= 25°C and represent the most likely parametric norm.
(3) Limits are specified and 100% production tested.
(4) The short circuit current is less than the maximum output current with the −12V and −15V versions due to internal foldback current
limiting. The −5V and −5.2V 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 1.5A.
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