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| LP3893_15 Datasheet, PDF (3/16 Pages) Texas Instruments – 3A Fast-Response Ultra Low Dropout Linear Regulators | |||
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LP3893
www.ti.com
SNVS237B â SEPTEMBER 2003 â REVISED APRIL 2013
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 = COUT =10 µF, VS/D = VBIAS.
Symbol
Parameter
Conditions
Typical (1) MIN (2) MAX (2) Units
VO
Output Voltage Tolerance
10 mA ⤠IL ⤠3A
VO(NOM) + 1V ⤠VIN ⤠5.5V
4.5V ⤠VBIAS ⤠6V
1.216
1.198
1.186
1.234
1.246
1.5
1.478 1.522
1.455 1.545
V
ÎVO/ÎVI
N
ÎVO/ÎIL
Output Voltage Line Regulation (3)
Output Voltage Load Regulation (4)
VDO
Dropout Voltage (5)
VO(NOM) + 1V ⤠VIN ⤠5.5V
10 mA ⤠IL ⤠3A
IL = 3A
1.8
1.773
1.746
1.827
1.854
0.01
%/V
0.04
0.06
%/A
270
650
1000
mV
IQ(VIN)
Quiescent Current Drawn from VIN
Supply
10 mA ⤠IL ⤠3A
3
7
8
mA
VS/D ⤠0.3V
0.03
1
30
µA
IQ(VBIAS) Quiescent Current Drawn from VBIAS 10 mA ⤠IL ⤠3A
Supply
1
2
3
mA
VS/D ⤠0.3V
0.03
1
30
µA
ISC
Short-Circuit Current
Shutdown Input
VOUT = 0V
6
A
VSDT
Output Turn-off Threshold
Output = ON
Output = OFF
0.7
1.3
V
0.7
0.3
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
VS/D ⤠0.3V
1
µA
â1
AC Parameters
PSRR Ripple Rejection for VIN Input Voltage VIN = VOUT +1V, f = 120 Hz
80
(VIN)
VIN = VOUT + 1V, f = 1 kHz
65
PSRR Ripple Rejection for VBIAS Voltage
VBIAS = VOUT + 3V, f = 120 Hz
70
(VBIAS)
VBIAS = VOUT + 3V, f = 1 kHz
65
Output Noise Density
f = 120 Hz
1
dB
µV/rootâ
Hz
en
Output Noise Voltage
BW = 10 Hz â 100 kHz, VOUT = 1.8V
150
BW = 300 Hz â 300 kHz, VOUT = 1.8V
90
µV (rms)
(1) Typical numbers represent the most likely parametric norm for 25°C operation.
(2) Limits are specified through testing, statistical correlation, or design.
(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.
Copyright © 2003â2013, Texas Instruments Incorporated
Product Folder Links: LP3893
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