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LP38856 Datasheet(PDF) 3 Page - Texas Instruments

Part No. LP38856
Description  3A Fast-Response High-Accuracy LDO Linear Regulator with Enable
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LP38856 Datasheet(HTML) 3 Page - Texas Instruments

 
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LP38856
www.ti.com
SNVS336D – JUNE 2006 – REVISED OCTOBER 2011
Operating Ratings
(1)
VIN Supply Voltage
(VOUT + VDO) to VBIAS
VBIAS Supply Voltage
3.0V to 5.5V
VEN Enable Input Voltage
0.0V to VBIAS
IOUT
0 mA to 3.0A
Junction Temperature Range(2)
−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 (TD), ambient temperature (TA), and package junction to
ambient thermal resistance (
θJA). Additional heat-sinking may be required to ensure that the device junction temperature (TJ) does not
exceed the maximum operating rating. See the Application Information section for details.
Electrical Characteristics
Unless otherwise specified: VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1µF, VEN = VBIAS.
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C
to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent
the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
MIN
TYP
MAX
Units
VOUT(NOM) + 1V ≤ VIN ≤ VBIAS,
-1.0
+1.0
3.0V
≤ VBIAS ≤ 5.5V,
0.0
-3.0
+3.0
10 mA
≤ IOUT ≤ 3.0A
VOUT
Output Voltage Tolerance
%
VOUT(NOM) + 1V ≤ VIN ≤ VBIAS,
3.0V
≤ VBIAS ≤ 5.5V,
-2.0
0
+2.0
10 mA
≤ IOUT ≤ 3.0A,
0°C
≤ TJ ≤ 125°C
ΔVOUT/ΔVIN
Line Regulation, VIN
(1)
VOUT(NOM) + 1V ≤ VIN ≤ VBIAS
-
0.04
-
%/V
ΔVOUT/ΔVBIAS Line Regulation, VBIAS
(1)
3.0V
≤ VBIAS ≤ 5.5V
-
0.10
-
%/V
ΔVOUT/ΔIOUT
Output Voltage Load Regulation(2)
10 mA
≤ IOUT ≤ 3.0A
-
0.2
-
%/A
Dropout Voltage
300
VDO
IOUT = 3.0A
-
240
mV
VIN − VOUT
(3)
450
LP38856-0.8
8.5
-
7.0
10 mA
≤ IOUT ≤ 3.0A
9.0
mA
Ground Pin Current Drawn from VIN LP38856-1.2
12
IGND(IN)
-
11
Supply
10 mA
≤ IOUT ≤ 3.0A
15
10
VEN ≤ 0.5V
-
1.0
µA
300
3.8
10 mA
≤ IOUT ≤ 3.0A
-
3.0
mA
4.5
Ground Pin Current Drawn from
IGND(BIAS)
VBIAS Supply
170
VEN ≤ 0.5V
-
100
µA
200
VBIAS rising until device is
2.20
2.70
UVLO
Under-Voltage Lock-Out Threshold
2.45
V
functional
2.00
2.90
VBIAS falling from UVLO threshold
60
300
UVLO(HYS)
Under-Voltage Lock-Out Hysteresis
150
mV
until device is non-functional
50
350
VIN = VOUT(NOM) + 1V,
ISC
Output Short-Circuit Current
-
6.2
-
A
VBIAS = 3.0V, VOUT = 0.0V
ENABLE Pin
VEN = VBIAS
-
0.01
-
IEN
ENABLE pin Current
µA
-19
-40
VEN = 0.0V, VBIAS = 5.5V
-30
-13
-51
1.00
1.50
VEN(ON)
Enable Voltage Threshold
VEN rising until Output = ON
1.25
V
0.90
1.55
(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 (VIN - VOUT) where the input voltage is low enough to cause the
output voltage to drop no more than 2% from the nominal value
Copyright © 2006–2011, Texas Instruments Incorporated
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