LP3962 Datasheet, PDF (8/22 Pages) National Semiconductor (TI) – 1.5A Fast Ultra Low Dropout Linear Regulators

Electrical Characteristics
LP3962/LP3965 (Continued)
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 = 33µF, V_SD = V_IN-0.3V.
Symbol
Parameter
Conditions
Typ
(Note 4)
LP3962/5 (Note 5)
Min
Max
Units
T_dOFF
Turn-off delay
I_L = 1.5 A
20
µs
T_dON
Turn-on delay
I_L = 1.5 A
25
µs
I_SD
SD Input Current
V_SD = V_IN
1
nA
ERROR FLAG COMPARATOR
V_T
V_TH
V_EF(Sat)
Td
Threshold
Threshold Hysteresis
Error Flag Saturation
Flag Reset Delay
(Note 9)
(Note 9)
I_sink = 100µA
10
5
5
2
0.02
1
16
%
8
%
0.1
V
µs
I_lk
Error Flag Pin Leakage
Current
1
nA
I_max
Error Flag Pin Sink
V_Error = 0.5V (over temp.)
1
mA
Current
AC PARAMETERS
V_IN = V_OUT + 1.5V
60
C_OUT = 100uF
PSRR
Ripple Rejection
V_OUT = 3.3V
V_IN = V_OUT + 0.3V
40
C_OUT = 100uF
V_OUT = 3.3V
ρ_n(l/f
Output Noise Density
f = 120Hz
0.8
Output Noise Voltage
BW = 10Hz – 100kHz
150
e_n
(rms)
BW = 300Hz – 300kHz
100
dB
µV
µV (rms)
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 Charateristics. 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_jA = 50˚C/W
(with 0.5in², 1oz. copper area), junction-to-ambient (with no heat sink). The devices in the TO263 surface-mount package must be derated at θ_jA = 60˚C/W (with
0.5in², 1oz. copper area), junction-to-ambient. The devices in SOT223 package must be derated at θ_jA = 90˚C/W (with 0.5in², 1oz. copper area), junction-to-ambient.
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 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP396X output must be diode-clamped to ground.
Note 7: The output PMOS structure contains a diode between the V_IN and V_OUT terminals. This diode is normally reverse biased. This diode will get forward 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. The line and load regulation specification contains only
the typical number. However, the limits for line and load regulation are included in the output voltage tolerance specification.
Note 9: Error Flag threshold and hysteresis are specified as percentage of regulated output voltage.
Note 10: 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 11: This specification has been tested for −40˚C ≤ T_J ≤ 85˚C since the temperature rise of the device is negligible under shutdown conditions.
Note 12: The minimum operating value for V_IN is equal to either [V_OUT(NOM) + V_DROPOUT] or 2.5V, whichever is greater.
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