LP3875EMP-18 Datasheet, PDF (5/25 Pages) Texas Instruments – LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators

LP3872, LP3875
www.ti.com
SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS – LP3872/LP3875
Limits in standard typeface are for T_J = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V_IN = V_O(NOM) + 1V, I_L = 10 mA, C_OUT = 10µF, V_SD = 2V.
Symbol
Parameter
Conditions
Typ ⁽¹⁾
LP3872/5 ⁽²⁾
Min Max
Units
V_O
Output Voltage Tolerance ⁽³⁾
V_OUT +1V ≤ V_IN ≤ 7.0V, 10 mA ≤ I_L ≤ 1.5A
0
-1.5 +1.5
-3.0 +3.0
%
ΔV _OL
Output Voltage Line Regulation ⁽³⁾ _{VOUT + 1V ≤ VIN ≤ 7.0V}
0.02
0.06
%
ΔV_O/
ΔI_OUT
Output Voltage Load Regulation ⁽³⁾ _{10 mA ≤ IL ≤ 1.5A}
0.06
0.12
%
V_IN -
V_OUT
Dropout Voltage ⁽⁴⁾
I_L = 150 mA
I_L = 1.5A
38
50
60
mV
380
450
550
I_GND
Ground Pin Current In Normal
Operation Mode
I_L = 150 mA
I_L = 1.5A
5
9
10
mA
6
14
15
Ground Pin Current In Shutdown
I_GND
Mode
I_O(PK)
Peak Output Current
Short Circuit Protection
V_SD ≤ 0.3V
-40°C ≤ T_J ≤ 85°C
V_O ≥ V_O(NOM) - 4%
0.01
10
µA
50
1.8
A
I_SC Short Circuit Current
Shutdown Input
3.2
A
V_SDT
Shutdown Threshold
Output = High
Output = Low
V_IN
2
V
0
0.3
T_dOFF
Turn-off delay
T_dON
Turn-on delay
I_SD
SD Input Current
Error Flag
V_T
V_TH
V_EF(Sat)
Td
Threshold
Threshold Hysteresis
Error Flag Saturation
Flag Reset Delay
I_L = 1.5A
I_L = 1.5A
V_SD = V_IN
See ⁽⁵⁾
See ⁽⁵⁾
I_sink = 100µA
20
µs
25
µs
1
nA
10
5
16
%
5
2
8
%
0.02
0.1
V
1
µs
I_lk
Error Flag Pin Leakage Current
I_max
Error Flag Pin Sink Current
AC Parameters
V_Error = 0.5V
1
nA
1
mA
PSRR Ripple Rejection
V_IN = V_OUT + 1V, C_OUT = 10µF
V_OUT = 3.3V, f = 120Hz
73
V_IN = V_OUT + 0.5V, C_OUT = 10µF
V_OUT = 3.3V, f = 120Hz
57
ρ_n(l/f)
Output Noise Density
f = 120Hz
0.8
e_n
Output Noise Voltage
BW = 10Hz – 100kHz, V_OUT = 2.5V
BW = 300Hz – 300kH, V_OUT = 2.5V
150
100
dB
µV
µV
(rms)
(1) Typical numbers are at 25°C and represent the most likely parametric norm.
(2) Limits are specified by testing, design, or statistical correlation.
(3) Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage.
Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current. The line
and load regulation specification contains only the typical number. However, the limits for line and load regulation are included in the
output voltage tolerance specification.
(4) Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.
Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is
nothing but the input to output differential, since the minimum input voltage is 2.5V.
(5) Error Flag threshold and hysteresis are specified as percentage of regulated output voltage. See Application Hints.
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