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| LP38841 Datasheet, PDF (4/18 Pages) National Semiconductor (TI) – 0.8A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors | |||
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LP38841
SNVS289B â DECEMBER 2004 â REVISED SEPTEMBER 2006
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 guaranteed through testing, statistical correlation, or design.
Symbol
Parameter
Conditions
Min
Typ (1)
Max
Units
VO
Output Voltage Tolerance
10 mA < IL < 0.8A
VO(NOM) + 1V ⤠VIN ⤠5.5V
0.788
0.776
0.8
0.812
0.824
4.5V ⤠VBIAS ⤠5.5V
1.182
1.164
1.2
1.218
1.236
V
ÎVO/ÎVIN
ÎVO/ÎIL
VDO
Output Voltage Line Regulation (2) VO(NOM) + 1V ⤠VIN ⤠5.5V
Output Voltage Load Regulation (3) 10 mA < IL < 0.8A
Dropout Voltage (4)
IL = 0.8A
1.478
1.455
1.5
1.523
1.545
0.01
%/V
0.1
0.4
1.3
%/A
75
120
205
mV
IQ(VIN)
Quiescent Current Drawn from VIN 10 mA < IL < 0.8A
Supply
30
35
40
mA
VS/D ⤠0.3V
0.06
1
30
µA
IQ(VBIAS)
Quiescent Current Drawn from
VBIAS Supply
10 mA < IL < 0.8A
VS/D ⤠0.3V
2
4
6
mA
0.03
1
30
µA
ISC
Short-Circuit Current
Shutdown Input
VOUT = 0V
2.6
A
VSDT
Output Turn-off Threshold
Output = ON
Output = OFF
0.7
1.3
V
0.3
0.7
Td (OFF)
Td (ON)
IS/D
θJ-A
Turn-OFF Delay
Turn-ON Delay
S/D Input Current
Junction to Ambient Thermal
Resistance
RLOAD X COUT << Td (OFF)
RLOAD X COUT << Td (ON)
VS/D =1.3V
VS/D ⤠0.3V
TO-220, No Heatsink
TO-263, 1 sq.in Copper
20
µs
15
1
µA
â1
65
°C/W
35
AC Parameters
PSRR (VIN)
Ripple Rejection for VIN Input
Voltage
VIN = VOUT +1V, f = 120 Hz
80
PSRR (VBIAS) Ripple Rejection for VBIAS Voltage
en
Output Noise Density
VIN = VOUT + 1V, f = 1 kHz
VBIAS = VOUT + 3V, f = 120 Hz
VBIAS = VOUT + 3V, f = 1 kHz
f = 120 Hz
65
dB
58
58
1
µV/rootâH
z
Output Noise Voltage
VOUT = 1.5V
BW = 10 Hz â 100 kHz
BW = 300 Hz â 300 kHz
150
µV (rms)
90
(1) Typical numbers represent the most likely parametric norm for 25°C operation.
(2) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(3) 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.
(4) 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 © 2004â2006, Texas Instruments Incorporated
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