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| LP3892 Datasheet, PDF (4/18 Pages) National Semiconductor (TI) – 1.5A Fast-Response Ultra Low Dropout Linear Regulators | |||
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LP3892
SNVS236D â SEPTEMBER 2003 â 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 = COUT = 10µF, VS/D = VBIAS.
Symbol
Parameter
Conditions
MIN (1)
Typical
(2)
MAX (1)
Units
VO
Output Voltage Tolerance
10 mA ⤠IL⤠1.5A,
VO(NOM) + 1V ⤠VIN ⤠5.5V,
4.5V ⤠VBIAS ⤠6V
ÎVO/ÎVIN Output Voltage Line Regulation(3) (4) VO(NOM) + 1V ⤠VIN ⤠5.5V
ÎVO/ÎIL Output Voltage Load Regulation (5) 10 mA ⤠IL⤠1.5A
VDO
Dropout Voltage (6)
IL = 1.5A (TO-220 and DDPAK/TO-263
only)
IL = 1.5A (SO PowerPAD only)
IQ(VIN)
Quiescent Current Drawn from VIN
Supply
10 mA ⤠IL⤠1.5A
VS/D ⤠0.3V
IQ(VBIAS)
Quiescent Current Drawn from VBIAS
Supply
10 mA ⤠IL⤠1.5A
VS/D ⤠0.3V
ISC
Short-Circuit Current
Shutdown Input
VOUT = 0V
VSDT
Output Turn-off Threshold
Output = ON
Output = OFF
Td (OFF)
Td (ON)
IS/D
Turn-OFF Delay
Turn-ON Delay
S/D Input Current
AC Parameters
RLOAD X COUT << Td (OFF)
RLOAD X COUT << Td (ON)
VS/D =1.3V
VS/D ⤠0.3V
PSRR
(VIN)
PSRR
(VBIAS)
Ripple Rejection for VIN Input Voltage
Ripple Rejection for VBIAS Voltage
Output Noise Density
VIN = VOUT +1V, f = 120 Hz
VIN = VOUT + 1V, f = 1 kHz
VBIAS = VOUT + 3V, f = 120 Hz
VBIAS = VOUT + 3V, f = 1 kHz
f = 120 Hz
en
Output Noise Voltage
BW = 10 Hz â 100 kHz, VOUT = 1.8V
BW = 300 Hz â 300 kHz, VOUT = 1.8V
1.198
1.186
1.478
1.455
1.773
1.746
1.3
1.216
1.234
1.246
1.5
1.522
1.545
V
1.8
1.827
1.854
0.01
%/V
0.04
0.06
%/A
140
320
500
mV
155
340
550
3
7
8
mA
0.03
1
30
µA
1
2
3
mA
0.03
1
30
µA
4.3
A
0.7
V
0.7
0.3
20
µs
15
1
µA
â1
80
65
dB
70
65
1
µV/rootâ
Hz
150
µV (rms)
90
(1) Limits are specified through testing, statistical correlation, or design.
(2) Typical numbers represent the most likely parametric norm for 25°C operation.
(3) 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.
(4) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(5) 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.
(6) Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value. The SO
PowerPAD-8 package devices have a slightly higher dropout voltage due to increased band wire resistance.
4
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