Datasheet
LP3855-ADJ
SNVS244F –SEPTEMBER 2003–REVISED APRIL 2013
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ELECTRICAL CHARACTERISTICS — LP3855-ADJ
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
= 10 mA, C
OUT
= 10µF, V
SD
= 2V.
LP3855-ADJ
(2)
Symbol Parameter Conditions Typ
(1)
Units
Min Max
V
OUT
+1V ≤ V
IN
≤ 7V 1.198 1.234
V
ADJ
Adjust Pin Voltage 1.216 V
10 mA ≤ I
L
≤ 1.5A 1.180 1.253
V
OUT
+1V ≤ V
IN
≤ 7V
I
ADJ
Adjust Pin Input Current 10 100 nA
10 mA ≤ I
L
≤ 1.5A
Output Voltage Line 0.02
ΔV
OL
V
OUT
+1V ≤ V
IN
≤ 7.0V %
Regulation
(3)
0.06
Output Voltage Load
0.06
ΔV
O
/ ΔI
OUT
10 mA ≤ I
L
≤ 1.5A %
0.12
Regulation
(3)
35
I
L
= 150 mA 24
Dropout Voltage,
45
DDPAK/TO-263 and TO-
310
220
(4)
I
L
= 1.5A 240 mV
420
V
IN
- V
OUT
35
I
L
= 150 mA 26
45
Dropout Voltage,
SOT 223
(4)(5)
320
I
L
= 1.5A 260
435
9
I
L
= 150 mA 3
10
Ground Pin Current In
I
GND
mA
Normal Operation Mode
9
I
L
= 1.5A 3
10
V
SD
≤ 0.3V 0.01 10
Ground Pin Current In
I
GND
µA
Shutdown Mode
-40°C ≤ T
J
≤ 85°C 50
I
O(PK)
Peak Output Current V
O
≥ V
O(NOM)
- 4% 1.8 A
Short Circuit Protection
I
SC
Short Circuit Current 3.2 A
Shutdown Input
V
SDT
Rising from 0.3V
1.3 2
until Output = ON
V
SDT
Shutdown Threshold V
V
SDT
Falling from 2.0V
1.3 0.3
until Output = OFF
T
dOFF
Turn-off delay I
L
= 1.5A 20 µs
T
dON
Turn-on delay I
L
= 1.5A 25 µs
I
SD
SD Input Current V
SD
= V
IN
1 nA
AC Parameters
V
IN
= V
OUT
+ 1V, C
OUT
= 10uF
73
V
OUT
= 3.3V, f = 120Hz
PSRR Ripple Rejection dB
V
IN
= V
OUT
+ 0.5V, C
OUT
= 10uF
57
V
OUT
= 3.3V, f = 120Hz
ρ
n(l/f)
Output Noise Density f = 120Hz 0.8 µV
BW = 10Hz – 100kHz, V
OUT
= 2.5V 150
e
n
Output Noise Voltage µV (rms)
BW = 300Hz – 300kHz, V
OUT
= 2.5V 100
(1) Typical numbers are at 25°C and represent the most likely parametric norm.
(2) Limits are specified by testing, design, or statistical correlation.
(3) Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage.
Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current.
(4) Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.
Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is
nothing but the input to output differential, since the minimum input voltage is 2.5V.
(5) The SOT-223 package devices have slightly higher dropout due to increased bond wire resistance.
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