Datasheet

LP3875-ADJ
SNVS247D –SEPTEMBER 2003–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS — LP3875-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.
Typ
(1)
LP3875-ADJ
(2)
Symbol Parameter Conditions 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
0.02
ΔV
OL
Output Voltage Line Regulation
(3)
V
OUT
+1V ≤ V
IN
≤ 7.0V %
0.06
0.06
ΔV
O
/ ΔI
OUT
Output Voltage Load Regulation
(3)
10 mA ≤ I
L
≤ 1.5A %
0.12
50
I
L
= 150 mA 38
60
V
IN
- V
OUT
Dropout Voltage
(4)
mV
450
I
L
= 1.5A 380
550
9
I
L
= 150 mA 5
10
Ground Pin Current In Normal
I
GND
mA
Operation Mode
14
I
L
= 1.5A 6
15
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% 1.8 A
Short Circuit Protection
I
SC
Short Circuit Current 3.2 A
Shutdown Input
Output = High V
IN
2
V
SDT
Shutdown Threshold V
Output = Low 0 0.3
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 73
C
OUT
= 10uF
V
OUT
= 3.3V, f = 120Hz
PSRR Ripple Rejection dB
V
IN
= V
OUT
+ 0.5V 57
C
OUT
= 10uF
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.
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