LP38855 Datasheet, PDF (4/14 Pages) National Semiconductor (TI) – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

Symbol
ENABLE Pin
Parameter
I_EN
ENABLE pin Current
Conditions
V_EN = V_BIAS
V_EN = 0.0V, V_BIAS = 5.5V
V_EN(ON) Enable Voltage Threshold
V_EN rising until Output = ON
V_EN(HYS) Enable Voltage Hysteresis
V_EN falling from V_EN(ON) until
Output = OFF
t_OFF
Turn-OFF Delay Time
t_ON
Turn-ON Delay Time
AC Parameters
R_LOAD × C_OUT << t_OFF
R_LOAD × C_OUT << t_ON
PSRR
(V_IN)
Ripple Rejection for V_IN Input
Voltage
V_IN = V_OUT +1V,
f = 120 Hz
V_IN = V_OUT + 1V,
f = 1 kHz
PSRR
(V_BIAS)
Ripple Rejection for V_BIAS Voltage
V_BIAS = V_OUT + 3V,
f = 120 Hz
V_BIAS = V_OUT + 3V,
f = 1 kHz
Output Noise Density
f = 120 Hz
e_n
Output Noise Voltage
BW = 10 Hz − 100 kHz
BW = 300 Hz − 300 kHz
Thermal Parameters
T_SD
Thermal Shutdown Junction
Temperature
T_SD(HYS)
θ_JA
Thermal Shutdown Hysteresis
Thermal Resistance, Junction to
Ambient(Note 3)
TO220-5
TO263-5
Thermal Resistance, Junction to TO220-5
θ_JC
Case(Note 3)
TO263-5
MIN
TYP
MAX
Units
-
0.01
-
-19
-13
-30
-40
-51
µA
1.00
0.90
1.25
1.50
1.55
V
50
100
150
mV
30
200
-
20
-
µs
-
15
-
-
80
-
dB
-
65
-
-
58
-
dB
-
58
-
-
1
-
µV/√Hz
-
150
-
-
90
-
µV_RMS
-
160
-
°C
-
10
-
-
60
-
-
60
-
°C/W
-
3
-
-
3
-
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device
is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics. Specifications do not
apply when operating the device outside of its rated operating conditions.
Note 2: The Human Body Model (HBM) is a 100 pF capacitor discharged through a 1.5k resistor into each pin. Test method is per JESD22-A114. The HBM rating
for device pin 1 (EN) is ±1.5 kV.
Note 3: Device power dissipation must be de-rated based on device power dissipation (T_D), ambient temperature (T_A), and package junction to ambient thermal
resistance (θ_JA). Additional heat-sinking may be required to ensure that the device junction temperature (T_J) does not exceed the maximum operating rating. See
the Application Information section for details.
Note 4: Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
Note 5: Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load to full load.
Note 6: Dropout voltage is defined the as input to output voltage differential (V_IN - V_OUT) where the input voltage is low enough to cause the output voltage to
drop 2% from the nominal value.
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