Datasheet

LM2991
www.ti.com SNVS099H –MAY 1999–REVISED JUNE 2013
ELECTRICAL CHARACTERISTICS
V
IN
= −10V, V
O
= −3V, I
O
= 1A, C
O
= 47 μF, R1 = 2.7 kΩ, T
J
= 25°C, unless otherwise specified. Boldface limits apply over
the entire operating junction temperature range.
Parameter Conditions Typical
(1)
Min Max Units
5 mA ≤ I
O
≤ 1A −1.210 −1.234 −1.186
Reference Voltage V
5 mA ≤ I
O
≤ 1A, V
O
− 1V ≥ V
IN
≥ −26V −1.27 −1.15
−2 −3
Output Voltage Range V
V
IN
= −26V −25 −24
Line Regulation I
O
= 5 mA, V
O
− 1V ≥ V
IN
≥ −26V 0.004 0.04 %/V
Load Regulation 50 mA ≤ I
O
≤ 1A 0.04 0.4 %
0.1 0.2
I
O
= 0.1A, ΔV
O
≤ 100 mV V
0.3
Dropout Voltage
0.6 0.8
I
O
= 1A, ΔV
O
≤ 100 mV V
1
Quiescent Current I
O
≤ 1A 0.7 5 mA
Dropout Quiescent Current V
IN
= V
O
, I
O
≤ 1A 16 50 mA
Ripple Rejection V
ripple
= 1 Vrms, f
ripple
= 1 kHz, I
O
= 5 mA 60 50 dB
Output Noise 10 Hz − 100 kHz, I
O
= 5 mA 200 450 μV
(V
OUT
: ON) 1.2 0.8
ON /OFF Input Voltage V
(V
OUT
: OFF) 1.3 2.4
V
ON/OFF
= 0.8V (V
OUT
: ON) 0.1 10
ON /OFF Input Current μA
V
ON/OFF
= 2.4V (V
OUT
: OFF) 40 100
Output Leakage Current V
IN
= −26V, V
ON/OFF
= 2.4V, V
OUT
= 0V 60 250 μA
Current Limit V
OUT
= 0V 2 1.5 A
(1) Typicals are at T
J
= 25°C and represent the most likely parametric norm.
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