Datasheet

LP2987, LP2988
SNVS004J –MARCH 1999–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
OUT
= 4.7 µF, C
IN
= 2.2 µF, V
S/D
= 2V.
LM2987/8AI-X.X
(1)
LM2987/8I-X.X
(1)
Symbol Parameter Conditions Typical Units
Min Max Min Max
V
IN
–V
O
Dropout Voltage I
L
= 100 µA 2.0 2.0
1
(2)
3.5 3.5
I
L
= 75 mA 120 120
90 mV
170 170
I
L
= 200 mA 230 230
180
350 350
I
GND
Ground Pin Current I
L
= 100 µA 120 120
100
150 150
µA
I
L
= 75 mA 800 800
500
1400 1400
I
L
= 200 mA 2.1 2.1
1 mA
3.7 3.7
V
S/D
< 0.3V 0.05 1.5 1.5 µA
I
O
(PK) Peak Output Current V
OUT
≥ V
O
(NOM) − 5% 400 250 250
mA
I
O
(MAX) Short Circuit Current R
L
= 0 (Steady State)
(3)
400
e
n
LP2987 Output Noise BW = 300 Hz to
Voltage (RMS) 50 kHz, V
OUT
= 3.3V 100
C
OUT
= 10 µF
µV(RMS)
LP2988 Output Noise BW = 300 Hz to 50 kHz,
Voltage (RMS) V
OUT
= 3.3V
20
C
OUT
= 10 µF
C
BYPASS
= .01 µF
ΔV
OUT
/ΔV
IN
Ripple Rejection f = 1 kHz, C
OUT
= 10 µF
65 dB
C
BYP
= 0 (LP2988)
ΔV
OUT
/ΔT Output Voltage
(4)
20 ppm/°C
Temperature Coefficient
I
DELAY
Delay Pin Current Source 1.6 2.8 1.6 2.8
2.2 µA
1.4 3.0 1.4 3.0
SHUTDOWN INPUT
V
S/D
S/D Input Voltage V
H
= O/P ON 1.4 1.6 1.6
V
(5)
V
L
= O/P OFF 0.55 0.18 0.18
I
S/D
S/D Input Current V
S/D
= 0 0 −1 −1
µA
V
S/D
= 5V 5 15 15
(2) Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a
1V differential.
(3) See TYPICAL PERFORMANCE CHARACTERISTICS curves.
(4) Temperature coefficient is defined as the maximum (worst-case) change divided by the total temperature range.
(5) To prevent mis-operation, the Shutdown input must be driven by a signal that swings above V
H
and below V
L
with a slew rate not less
than 40 mV/µs (see APPLICATION HINTS).
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