lp3855et-adj National Semiconductor Corporation, lp3855et-adj Datasheet - Page 6

• Manufacturer Part Number: lp3855et-adj
• Description: 1.5a Fast Response Ultra Low Dropout Linear Regulators
• Manufacturer: National Semiconductor Corporation

www.national.com
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
C/W (with 0.5in
(with 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
biased 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
Note 11: The SOT 223 package devices have slightly higher dropout due to increased bond wire resistance.
Symbol
PSRR
T
V
T
ρ
dOFF
I
e
dON
n(l/f)
SDT
SD
n
2
, 1oz. copper area), junction-to-ambient. See Application Hints.
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
Parameter
IN
is equal to either [V
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
= 1.5A
= 1.5A
= V
= V
= V
= 3.3V, f = 120Hz
= 3.3V, f = 120Hz
= 2.5V
= 2.5V
= 10uF
= 10uF
OUT(NOM)
OUT
OUT
IN
IN
and V
Conditions
+ 1V
+ 0.5V
+ V
OUT
6
DROPOUT
terminals. This diode is normally reverse biased. This diode will get forward
] or 2.5V, whichever is greater.
Typ (Note
150
100
V
0.8
20
25
73
57
4)
0
1
IN
LP3855-ADJ (Note 5)
Min
2
Max
0.3
jA
µV (rms)
= 60°C/W
Units
jA
nA
dB
µV
µs
µs
V
= 50°