LP38855_15 Datasheet, PDF (3/20 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

LP38855
www.ti.com
SNVS461D – OCTOBER 2006 – REVISED APRIL 2013
Operating Ratings⁽¹⁾
V_IN Supply Voltage
V_BIAS Supply Voltage
V_EN Enable Input Voltage
I_OUT
Junction Temperature Range⁽²⁾
(V_OUT + V_DO) to V_BIAS
3.0V to 5.5V
0.0V to V_BIAS
0 mA to 1.5A
−40°C to +125°C
(1) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications, see Electrical
Characteristics. Specifications do not apply when operating the device outside of its rated operating conditions.
(2) Device power dissipation must be de-rated based on device power dissipation (T_D), ambient temperature (T_A), and package junction to
ambient thermal resistance (θ_JA). Additional heat-sinking may be required to ensure that the device junction temperature (T_J) does not
exceed the maximum operating rating. See the Application Information section for details.
Electrical Characteristics
Unless otherwise specified: V_IN = V_OUT(NOM) + 1V, V_BIAS = 3.0V, I_OUT = 10 mA, C_IN = C_OUT = 10 µF, C_BIAS = 1µF, V_EN = V_BIAS.
Limits in standard type are for T_J = 25°C only; limits in boldface type apply over the junction temperature (T_J) range of -40°C
to +125°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent
the most likely parametric norm at T_J = 25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V_OUT
Output Voltage Tolerance
ΔV_OUT/ΔV_IN
ΔV_OUT/ΔV_BIAS
ΔV_OUT/ΔI_OUT
V_DO
Line Regulation, V_IN(1)
Line Regulation, V_BIAS(1)
Output Voltage Load Regulation⁽²⁾
Dropout Voltage, V_IN − V_OUT(3)
V_OUT(NOM) + 1V ≤ V_IN ≤ V_BIAS,
3.0V ≤ V_BIAS ≤ 5.5V,
10 mA ≤ I_OUT ≤ 1.5A
V_OUT(NOM) + 1V ≤ V_IN ≤ V_BIAS,
3.0V ≤ V_BIAS ≤ 5.5V,
10 mA ≤ I_OUT ≤ 1.5A,
0°C ≤ T_J ≤ 125°C
V_OUT(NOM) + 1V ≤ V_IN ≤ V_BIAS
3.0V ≤ V_BIAS ≤ 5.5V
10 mA ≤ I_OUT ≤ 1.5A
I_OUT = 1.5A
-1.0
-3.0
0
+1.0
+3.0
%
-2.0
0
+2.0
-
0.04
-
%/V
-
0.10
-
%/V
-
0.2
-
%/A
-
130
165
180
mV
I_GND(IN)
LP38855-0.8
10 mA ≤ I_OUT ≤ 1.5A
Ground Pin Current Drawn from V_IN LP38855-1.2
Supply
10 mA ≤ I_OUT ≤ 1.5A
V_EN ≤ 0.5V
-
7.0
8.5
9.0
mA
-
11
12
15
-
1.0
10
300
µA
I_GND(BIAS)
Ground Pin Current Drawn from
V_BIAS Supply
10 mA ≤ I_OUT ≤ 1.5A
V_EN ≤ 0.5V
-
3.0
3.8
4.5
mA
-
100
170
200
µA
UVLO
Under-Voltage Lock-Out Threshold
V_BIAS rising until device is
functional
2.20
2.00
2.45
2.70
2.90
V
UVLO_(HYS)
Under-Voltage Lock-Out Hysteresis
V_BIAS falling from UVLO threshold
until device is non-functional
60
50
150
300
350
mV
I_SC
Output Short-Circuit Current
V_IN = V_OUT(NOM) + 1V,
V_BIAS = 3.0V, V_OUT = 0.0V
-
4.5
-
A
(1) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(2) 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.
(3) Dropout voltage is defined the as input to output voltage differential (V_IN - V_OUT) where the input voltage is low enough to cause the
output voltage to drop 2% from the nominal value.
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