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| LP3891ES-1.2 Datasheet, PDF (4/19 Pages) Texas Instruments – 1.5% Output Accuracy (25°C), 60 nA Typical Quiescent Current in Shutdown | |||
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LP3891
SNVS235D 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 = 10 µF, VS/D = VBIAS.
Symbol
Parameter
Conditions
MIN (1)
Typical
(2)
MAX (1)
Units
VO
Output Voltage Tolerance
10 mA ⤠IL ⤠0.8A, VO(NOM) + 1V ⤠VIN â¤
5.5V,
4.5V ⤠VBIAS ⤠6V
ÎVO/ÎVIN
ÎVO/ÎIL
VDO
Output Voltage Line Regulation (3) VO(NOM) + 1V ⤠VIN ⤠5.5V
Output Voltage Load Regulation(4) 10 mA ⤠IL ⤠0.8A
(5)
Dropout Voltage (6)
IL = 0.8A (TO220 and TO263 only)
IL = 0.8A (SO PowerPAD only)
IQ(VIN)
Quiescent Current Drawn from VIN 10 mA ⤠IL ⤠0.8A
Supply
VS/D ⤠0.3V
IQ(VBIAS)
Quiescent Current Drawn from
VBIAS Supply
10 mA ⤠IL ⤠0.8A
VS/D ⤠0.3V
ISC
Short-Circuit Current
Shutdown Input
VSDT
Output Turn-off Threshold
Td (OFF)
Td (ON)
IS/D
Turn-OFF Delay
Turn-ON Delay
S/D Input Current
AC Parameters
PSRR (VIN) Ripple Rejection for VIN Input
Voltage
PSRR
(VBIAS)
Ripple Rejection for VBIAS Voltage
Output Noise Density
VOUT = 0V
Output = ON
Output = OFF
RLOAD X COUT << Td (OFF)
RLOAD X COUT << Td (ON)
VS/D =1.3V
VS/D ⤠0.3V
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
1.198
1.186
1.478
1.455
1.773
1.746
1.3
en
Output Noise Voltage
BW = 10 Hz â 100 kHz, VOUT = 1.8V
BW = 300 Hz â 300 kHz, VOUT = 1.8V
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
100
300
400
mV
115
320
430
3
7
8
mA
0.03
1
30
µA
1
2
3
mA
0.03
1
30
µA
2.5
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) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(4) 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.
(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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