Datasheet
LP3856-ADJ
SNVS243E –SEPTEMBER 2003–REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS — LP3856-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.
LP3856-ADJ
(2)
Symbol Parameter Conditions Typ
(1)
Units
Min Max
1.198 1.234
V
ADJ
Adjust Pin Voltage V
OUT
+1V ≤ V
IN
≤ 7V, 10 mA ≤ I
L
≤ 3A 1.216 V
1.180 1.253
I
ADJ
Adjust Pin Input Current V
OUT
+1V ≤ V
IN
≤ 7V, 10 mA ≤ I
L
≤ 3A 10 100 nA
0.02
ΔV
OL
Output Voltage Line Regulation
(3)
V
OUT
+1V ≤ V
IN
≤ 7.0V %
0.06
ΔV
O
/ 0.08
Output Voltage Load Regulation
(3)
10 mA ≤ I
L
≤ 3A %
ΔI
OUT
0.14
55
I
L
= 300 mA 39
75
V
IN
- V
OUT
Dropout Voltage
(4)
mV
500
I
L
= 3A 390
700
9
I
L
= 300 mA 4
10
Ground Pin Current In Normal
I
GND
mA
Operation Mode
9
I
L
= 3A 4
10
V
SD
≤ 0.3V 0.01 10
Ground Pin Current In Shutdown
I
GND
µA
Mode
-40°C ≤ T
J
≤ 85°C 50
I
O(PK)
Peak Output Current V
O
≥ V
O(NOM)
- 4% 4.5 A
Short Circuit Protection
I
SC
Short Circuit Current 6 A
Shutdown Input
V
SDT
Rising from 0.3V until Output = ON 1.3 2
V
SDT
Shutdown Threshold V
V
SDT
Falling from 2.0V until Output = OFF 1.3 0.3
T
dOFF
Turn-off delay I
L
= 3A 20 µs
T
dON
Turn-on delay I
L
= 3A 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
µV
e
n
Output Noise Voltage
(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 verified 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.
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