LP3873_15 Datasheet, PDF (4/24 Pages) Texas Instruments – 3A Fast Ultra Low Dropout Linear Regulators

LP3873, LP3876
SNVS220E – NOVEMBER 2002 – REVISED APRIL 2013
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Electrical Characteristics
LP3873/LP3876
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) + 1.5V, I_L = 10 mA, C_OUT = 10µF, V_SD = 2V.
Symbol
Parameter
Conditions
Typ ⁽¹⁾
LP3873/6 ⁽²⁾
Units
V_O
ΔV _OL
Output Voltage Tolerance⁽³⁾
Output Voltage Line
Regulation ⁽³⁾
V_OUT +1.5V ≤ V_IN ≤ 7.0V
10 mA ≤ I_L ≤ 3A
V_OUT + 1.5V ≤ V_IN ≤ 7.0V
Min
Max
0
-1.5
+1.5
-3.0
+3.0
%
0.02
%
0.06
ΔV_O/ ΔI_OUT Output Voltage Load
10 mA ≤ I_L ≤ 3A
0.08
%
Regulation ⁽³⁾
0.14
V_IN - V_OUT
Dropout Voltage⁽⁴⁾
I_L = 300 mA
I_L = 3A
80
100
120
mV
800
1000
1200
I_GND
Ground Pin Current In Normal
Operation Mode
I_L = 300 mA
I_L = 3A
5
9
10
mA
6
14
15
I_GND
Ground Pin Current In
Shutdown 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%
1
10
µA
50
4.5
A
I_SC
Short Circuit Current
SHUTDOWN INPUT
6
A
V_SDT
Shutdown Threshold
Output = High
Output = Low
V_IN
2
V
0
0.3
T_dOFF
T_dON
I_SD
ERROR FLAG
Turn-off delay
Turn-on delay
SD Input Current
V_T
V_TH
V_EF(Sat)
Td
Threshold
Threshold Hysteresis
Error Flag Saturation
Flag Reset Delay
I_L = 3A
I_L = 3A
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
1
nA
I_max
Error Flag Pin Sink Current
V_Error = 0.5V
1
mA
(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.
4
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