LP38858_15 Datasheet, PDF (3/21 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

LP38858
www.ti.com
SNVS462D – OCTOBER 2006 – REVISED APRIL 2013
Operating Ratings⁽¹⁾
V_IN Supply Voltage
V_BIAS Supply Voltage
I_OUT
Junction Temperature Range⁽²⁾
(V_OUT + V_DO) to V_BIAS
3.0V to 5.5V
0 mA to 1.5A
−40°C to +125°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but does not ensure specific performance limits. For ensured specifications and conditions,
see the Electrical Characteristics.
(2) Device power dissipation must be de-rated based on device power dissipation (P_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 = 1 µF, C_SS = open.
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
V_OUT Accuracy
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⁽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)
I_GND(BIAS)
UVLO
Quiescent Current Drawn from V_IN
Supply
Quiescent Current Drawn from
V_BIAS Supply
Under-Voltage Lock-Out Threshold
LP38858-0.8
10 mA ≤ I_OUT ≤ 1.5A
LP38858-1.2
10 mA ≤ I_OUT ≤ 1.5A
10 mA ≤ I_OUT ≤ 1.5A
V_BIAS rising until device is
functional
-
7.0
8.5
9.0
mA
11
12
15
-
3.0
3.8
4.5
mA
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
Soft-Start
Output Short-Circuit Current
V_IN = V_OUT(NOM) + 1V,
V_BIAS = 3.0V, V_OUT = 0.0V
-
4.5
-
A
LP38858-0.8
r_SS
Soft-Start internal resistance
LP38858-1.2
11.0
13.5
16.0
kΩ
13.5
16.0
18.5
t_SS
Soft-Start time
t_SS = C_SS × r_SS × 5
LP38858-0.8, C_SS = 10 nF
LP38858-1.2, C_SS = 10 nF
-
675
-
μs
-
800
-
(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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