Datasheet

LP38501-ADJ, LP38503-ADJ
SNVS522H –AUGUST 2007–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS, LP38501/3–ADJ
Unless otherwise specified: V
IN
= 3.3V, I
OUT
= 10 mA, C
IN
= 10 µF, C
OUT
= 10 µF, V
EN
= V
IN
, V
OUT
= 1.8V. 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 specified 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
2.7V ≤ V
IN
≤ 5.5V 0.584 0.626
V
ADJ
Adjust Pin Voltage
(1)
0.605 V
10 mA ≤ I
OUT
≤ 3A 0.575 0.635
Adjust Pin Voltage
(1)
2.7V ≤ V
IN
≤ 5.5V 0.596 0.614
V
ADJ
0.605 V
"A" GRADE 10 mA ≤ I
OUT
≤ 3A 0.587 0.623
I
ADJ
Adjust Pin Bias Current 2.7V ≤ V
IN
≤ 5.5V 50 750 nA
550
V
DO
Dropout Voltage
(2)
I
OUT
= 3A 420 mV
665
0.04
ΔV
OUT
/ΔV
IN
Output Voltage Line Regulation
(3) (1)
2.7V ≤ V
IN
≤ 5.5V — — %/V
0.05
0.12
ΔV
OUT
/ΔI
OUT
Output Voltage Load Regulation
(4)(1)
10 mA ≤ I
OUT
≤ 3A — — %/A
0.24
Ground Pin Current In Normal 4
I
GND
10 mA ≤ I
OUT
≤ 3A — 2 mA
Operation Mode 5
0.125
I
DISABLED
Ground Pin Current V
EN
< V
IL(EN)
— 0.025 µA
15
I
OUT(PK)
Peak Output Current V
OUT
≥ V
OUT(NOM)
- 5% 6 A
I
SC
Short Circuit Current V
OUT
= 0V 3.5 6 A
Enable Input (LP38501 Only)
V
IH(EN)
Enable Logic High V
OUT
= ON 1.4 — —
V
V
IL(EN)
Enable Logic Low V
OUT
= OFF — — 0.65
Time from V
EN
< V
IL(EN)
to V
OUT
= OFF
t
d(off)
Turn-off delay — 25 —
I
LOAD
= 3A
µs
Time from V
EN
>V
IH(EN)
to V
OUT
= ON
t
d(on)
Turn-on delay — 25 —
I
LOAD
= 3A
I
IH(EN)
Enable Pin High Current V
EN
= V
IN
— 35 —
nA
I
IL(EN)
Enable Pin Low Current V
EN
= 0V — 35 —
AC Parameters
V
IN
= 3.0V, I
OUT
= 3A
— 58 —
f = 120Hz
PSRR Ripple Rejection dB
V
IN
= 3.0V, I
OUT
= 3A
— 56 —
f = 1 kHz
ρ
n(l/f)
Output Noise Density f = 120Hz, C
OUT
= 10 µF CER — 1.0 — µV/√Hz
BW = 100Hz – 100kHz
e
n
Output Noise Voltage — 100 — µV (rms)
C
OUT
= 10 µF CER
Thermal Characteristics
T
SD
Thermal Shutdown T
J
rising — 170 —
°C
ΔT
SD
Thermal Shutdown Hysteresis T
J
falling from T
SD
— 10 —
Thermal Resistance TO-263, PFM THIN
(5)
θ
J-A
37
Junction to Ambient 1 sq. in. copper
°C/W
Thermal Resistance
θ
J-C
TO-263, TO-263 THIN — 5 —
Junction to Case
(1) 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.
(2) Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value. For
any output voltage less than 2.5V, the minimum V
IN
operating voltage is the limiting factor.
(3) Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the voltage at the
input.
(4) Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in the load current at the
output.
(5) The value of θ
JA
for the TO-263 (TS) package and TO-263 THIN (TJ) package can range from approximately 30 to 60°C/W depending
on the amount of PCB copper dedicated to heat transfer (See Application Information).
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