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LP38842-ADJ Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LP38842-ADJ
Description  1.5A Ultra Low Dropout Adjustable Linear Regulators Stable with Ceramic Output Capacitors
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP38842-ADJ Datasheet(HTML) 4 Page - National Semiconductor (TI)

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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 =VO(NOM) + 1V, VBIAS = 4.5V, IL =10mA,
CIN = 10 µF CER, COUT = 22 µF CER, VS/D =VBIAS. Min/Max limits are guaranteed through testing, statistical correlation, or
design. (Continued)
Symbol
Parameter
Conditions
MIN
TYP
(Note 4)
MAX
Units
AC Parameters
PSRR (V
IN)
Ripple Rejection for V
IN Input
Voltage
V
IN =VOUT +1V, f = 120 Hz
80
dB
V
IN =VOUT +1V,f=1kHz
65
PSRR (V
BIAS)
Ripple Rejection for V
BIAS
Voltage
V
BIAS =VOUT + 3V, f = 120 Hz
58
V
BIAS =VOUT +3V,f=1kHz
58
Output Noise Density
f = 120 Hz
1
µV/root−Hz
e
n
Output Noise Voltage
V
OUT = 1.5V
BW = 10 Hz − 100 kHz
150
µV (rms)
BW = 300 Hz − 300 kHz
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. 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.
Note 10: For optimum heat dissipation, the ground pad must be soldered to a copper plane or connected using vias to an internal copper plane.
www.national.com
4


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