RT8023
7
DS8023-03 March 2011 www.richtek.com
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θ
JA
is measured in the natural convection at T
A
= 25°C on a high effective four layers thermal conductivity test board of
JEDEC 51-7 thermal measurement standard. The case point of θ
JC
is on the expose pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The power source for thermal shutdown circuit must be provided by V
IN1
.
There must be a power input into LDO1 and
then the LDO2 can provide the thermal shutdown function.
Parameter Symbol Test Conditions Min Typ Max Unit
Current Limit I
LIM
R
LOAD
= 0Ω 0.35 0.48 0.6 A
Dropout Voltage V
DROP
I
OUT3
= 250mA, V
IN3
> 2.7V -- 250 400 mV
Load Regulation ΔV
LOAD
1mA < I
OUT3
< 250mA,
V
IN3
> 2.7V
-- 1 -- %
Line Regulation ΔV
LINE
V
IN3
= (V
OUT3
+ 0.5) to 5.5V
I
OUT3
= 1mA
-- 0.01 0.2 %/V
EN3 Pin Current I
EN3
Measured EN leakage current.
EN3 = 5.5V
-- 0.1 1 μA
Current Limit I
LIM
R
LOAD
= 0Ω 0.35 0.48 0.6 A
Dropout Voltage V
DROP
I
OUT3
= 250mA, V
IN3
> 2.7V -- 250 400 mV
Load Regulation ΔV
LOAD
1mA < I
OUT3
< 250mA,
V
IN3
> 2.7V
-- 1 -- %
Line Regulation ΔV
LINE
V
IN3
= (V
OUT3
+ 0.5) to 5.5V
I
OUT3
= 1mA
-- 0.01 0.2 %/V
Power Supply Rejection Ratio,
f = 100kHz
PSRR I
OUT3
= 150mA -- 40 -- dB
FB3 Threshold for PGOOD
Transition
-- 0.72 0.76 V
PGOOD3 Pull-Down Resistance -- -- 120 Ω
EN3 Input High 1.4 -- -- V
EN3 Input Low -- -- 0.4 V
