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LP38842 Datasheet(PDF) 4 Page - Texas Instruments

Part # LP38842
Description  Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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LP38842
SNVS291C – DECEMBER 2004 – REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = 10 µF CER, COUT = 22 µF CER, CBIAS = 1
µF CER, VS/D = VBIAS. Min/Max limits are specified through testing, statistical correlation, or design.
(1)
Symbol
Parameter
Conditions
Min
Typ (2)
Max
Units
VO
Output Voltage Tolerance
10 mA < IL < 1.5A
0.788
0.812
0.8
VO(NOM) + 1V ≤ VIN ≤ 5.5V
0.776
0.824
4.5V
≤ VBIAS ≤ 5.5V
1.182
1.218
1.2
V
1.164
1.236
1.478
1.523
1.5
1.455
1.545
ΔVO/ΔVIN
Output Voltage Line Regulation (3)
VO(NOM) + 1V ≤ VIN ≤ 5.5V
0.01
%/V
ΔVO/ΔIL
Output Voltage Load Regulation (4)
10 mA < IL < 1.5A
0.4
0.1
%/A
1.1
VDO
Dropout Voltage (5)
IL = 1.5A
175
115
mV
315
IQ(VIN)
Quiescent Current Drawn from VIN
10 mA < IL < 1.5A
35
30
mA
Supply
40
VS/D ≤ 0.3V
1
0.06
µA
30
IQ(VBIAS)
Quiescent Current Drawn from
10 mA < IL < 1.5A
4
2
mA
VBIAS Supply
6
VS/D ≤ 0.3V
1
0.03
µA
30
ISC
Short-Circuit Current
VOUT = 0V
4
A
Shutdown Input
VSDT
Output Turn-off Threshold
Output = ON
0.7
1.3
V
Output = OFF
0.3
0.7
Td (OFF)
Turn-OFF Delay
RLOAD X COUT << Td (OFF)
20
µs
Td (ON)
Turn-ON Delay
RLOAD X COUT << Td (ON)
15
IS/D
S/D Input Current
VS/D =1.3V
1
µA
VS/D ≤ 0.3V
−1
θJ-A
Junction to Ambient Thermal
TO-220, No Heatsink
65
°C/W
Resistance
DDPAK/TO-263, 1 sq.in Copper
35
AC Parameters
PSRR (VIN)
Ripple Rejection for VIN Input
VIN = VOUT +1V, f = 120 Hz
80
Voltage
VIN = VOUT + 1V, f = 1 kHz
65
dB
PSRR (VBIAS)
Ripple Rejection for VBIAS Voltage
VBIAS = VOUT + 3V, f = 120 Hz
58
VBIAS = VOUT + 3V, f = 1 kHz
58
en
Output Noise Density
f = 120 Hz
1
µV/Hz
Output Noise Voltage
BW = 10 Hz
− 100 kHz
150
µV (rms)
VOUT = 1.5V
BW = 300 Hz
− 300 kHz
90
(1)
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.
(2)
Typical numbers represent the most likely parametric norm for 25°C operation.
(3)
Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(4)
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.
(5)
Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value.
4
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Copyright © 2004–2013, Texas Instruments Incorporated
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