Datasheet

LP38500-ADJ, LP38502-ADJ
www.ti.com SNVS539F –NOVEMBER 2007–REVISED APRIL 2013
Electrical Characteristics
LP38500/2–ADJ (continued)
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
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% 3.6 A
I
SC
Short Circuit Current V
OUT
= 0V 2 3.7 A
Enable Input (LP38502 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
=
t
d(off)
Turn-off delay OFF — 25 —
I
LOAD
= 1.5A
µs
Time from V
EN
>V
IH(EN)
to V
OUT
=
t
d(on)
Turn-on delay ON — 25 —
I
LOAD
= 1.5A
I
IH(EN)
Enable Pin High Current V
EN
= V
IN
— 1 —
nA
I
IL(EN)
Enable Pin Low Current V
EN
= 0V — 0.1 —
AC Parameters
V
IN
= 3.0V, I
OUT
= 1.5A
— 58 —
f = 120Hz
PSRR Ripple Rejection dB
V
IN
= 3.0V, I
OUT
= 1.5A
— 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 DDPAK/TO-263, PFM
(5)
— 37 —
Junction to Ambient 1 sq. in. copper
θ
J-A
°C/W
Thermal Resistance
WSON
(6)
— 80 —
Junction to Ambient
DDPAK/TO-263, PFM — 5 —
Thermal Resistance
θ
J-C
°C/W
Junction to Case
WSON — 16 —
(5) The value of θ
JA
for the DDPAK/TO-263 package and PFM package can range from approximately 30 to 60°C/W depending on the
amount of PCB copper dedicated to heat transfer (See Application Information).
(6) θ
JA
for the WSON package was measured using the LP38502SD-ADJ evaluation board (See Application Information).
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