lp3856et-adj National Semiconductor Corporation, lp3856et-adj Datasheet - Page 5

• Manufacturer Part Number: lp3856et-adj
• Description: 3a Fast Response Ultra Low Dropout Linear Regulators
• Manufacturer: National Semiconductor Corporation

Electrical Characteristics
LP3856-ADJ
Shutdown Input
AC Parameters
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is
intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed
test conditions.
Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The devices in TO220 package must be derated at θ
(with 0.5in
0.5in
Note 3: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.
Note 5: Limits are guaranteed by testing, design, or statistical correlation.
Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the output must be diode-clamped to ground.
Note 7: The output PMOS structure contains a diode between the V
if the voltage at the output terminal is forced to be higher than the voltage at the input terminal. This diode can typically withstand 200mA of DC current and 1Amp
of peak current.
Note 8: 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.
Note 9: 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.
Note 10: The minimum operating value for V
Limits in standard typeface are for T
Unless otherwise specified: V
Symbol
PSRR
T
V
T
ρ
2
dOFF
I
SDT
dON
e
SD
n(l/f
, 1oz. copper area), junction-to-ambient. See Application Hints.
n
2
, 1oz. copper area), junction-to-ambient (with no heat sink). The devices in the TO263 surface-mount package must be derated at θ
Shutdown Threshold
Turn-off delay
Turn-on delay
SD Input Current
Ripple Rejection
Output Noise Density
Output Noise Voltage
(Continued)
Parameter
IN
= V
IN
O(NOM)
J
is equal to either [V
= 25˚C, and limits in boldface type apply over the full operating temperature range.
+ 1V, I
Output = High
Output = Low
I
I
V
V
C
V
V
C
V
f = 120Hz
BW = 10Hz – 100kHz
V
BW = 300Hz – 300kHz
V
L
L
SD
IN
OUT
IN
OUT
OUT
OUT
OUT
OUT
= 3A
= 3A
= V
= V
L
= V
= 3.3V, f = 120Hz
= 3.3V, f = 120Hz
= 2.5V
= 2.5V
= 10 mA, C
= 10uF
= 10uF
IN
OUT(NOM)
Conditions
OUT
OUT
IN
and V
+ 1V
+ 0.5V
OUT
+ V
terminals. This diode is normally reverse biased. This diode will get forward biased
5
DROPOUT
OUT
= 10µF, V
] or 2.5V, whichever is greater.
(Note 4)
SD
Typ
150
100
V
0.8
20
25
73
57
0
1
= 2V.
IN
Min
2
LP3856-ADJ
(Note 5)
Max
0.3
jA
= 60˚C/W (with
www.national.com
jA
µV (rms)
= 50˚C/W
Units
nA
dB
µV
µs
µs
V