LP38842 Datasheet, PDF (5/11 Pages) National Semiconductor (TI) – 1.5A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors

Electrical Characteristics 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, V_BIAS = 4.5V, I_L = 10 mA, C_IN =
10 µF CER, C_OUT = 22 µF CER, C_BIAS = 1 µF CER, V_S/D = V_BIAS. Min/Max limits are guaranteed through testing, statistical
correlation, or design. (Continued)
Symbol
Parameter
AC Parameters
PSRR (V_IN) Ripple Rejection for V_IN Input
Voltage
PSRR
(V_BIAS)
e_n
Ripple Rejection for V_BIAS
Voltage
Output Noise Density
Output Noise Voltage
V_OUT = 1.5V
Conditions
V_IN = V_OUT +1V, f = 120 Hz
V_IN = V_OUT + 1V, f = 1 kHz
V_BIAS = V_OUT + 3V, f = 120 Hz
V_BIAS = V_OUT + 3V, f = 1 kHz
f = 120 Hz
BW = 10 Hz − 100 kHz
BW = 300 Hz − 300 kHz
TYP
MIN
MAX
(Note 4)
Units
80
65
dB
58
58
1
µV/root−Hz
150
µV (rms)
90
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: At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink thermal values. θ_J-A for TO-220
devices is 65˚C/W if no heatsink is used. If the TO-220 device is attached to a heatsink, a θ_J-S value of 4˚C/W can be assumed. θ_J-A for TO-263 devices is
approximately 35˚C/W if soldered down to a copper plane which is at least 1 square inches in area. If power dissipation causes the junction temperature to exceed
specified limits, the device will go into thermal shutdown.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 4: Typical numbers represent the most likely parametric norm for 25˚C operation.
Note 5: If used in a dual-supply system where the regulator load is returned to a negative supply, the output pin must be diode clamped to ground.
Note 6: Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
Note 7: 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 8: Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value.
Note 9: The machine model is a 220 pF capacitor discharged directly into each pin.
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