RT9018A/B
Parameter
Chip Enable
Symbol
Test Conditions
Min
Typ
Max
Units
EN Input Bias Current
I
I
V
V
= 0V
--
--
12
10
--
--
20
1
μA
μA
EN
EN
RT9018A
VDD Shutdown
Current
= 0V
SHDN
EN
RT9018B
--
Logic-Low Voltage V
V
V
= 5V
= 5V
--
--
0.2
--
ENL
ENH
DD
EN Threshold
V
Logic-High Voltage V
1.2
--
DD
Power Good
PGOOD Rising Threshold
PGOOD Hysteresis
PGOOD Sink Capability
PGOOD Delay
--
3
90
10
93
--
%
%
I
= 10mA
--
0.2
1.5
0.4
5
V
PGOOD
0.5
ms
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Thermal Shutdown Temperature
Fold-back
T
--
--
160
30
--
--
°C
°C
SD
ΔT
SD
V
OUT
< 0.4V
--
110
--
°C
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. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a high effective thermal conductivity test board (4 Layers,
2S2P) of JEDEC 51-7 thermal measurement standard. The case point of θJC is on the expose pad for SOP-8 (Exposed
Pad) package.
Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no
load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
current.
Note 7. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load
regulation in the load range from 1mA to 3A.
www.richtek.com
4
DS9018A/B-04 September 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
