RT9181
150mA LDO Regulator with PGOOD
General Description
The RT9181 is a low dropout voltage regulator with an
output 2% accuracy and supply a continuous 150mA
current within operating range from a +3V to +5.5V input.
The power good function monitors the output voltage
and indicates by pulling low the power good output (open
drain).
The RT9181 requires a small output capacitor with low
ESR for stabilizing output voltage. The device also
minimizes output overshoot during power up.
The RT9181 uses an internal PMOS as the pass device,
which consumes 160μA supply current independent of
load and dropout conditions. The
EN pin controls
the
output and consumes no input bias current. Other
features include current limiting, over temperature
protection, and under voltage lockout.
Features
Low Dropout Voltage Regulator
Up to 150mA Output Current
Power Good (PGOOD) Function
Chip Enable/Shutdown Function
Load Independent, Low Quiescent Current, 160μA
μ
Current Limiting and Thermal Protection
Under Voltage Lockout (UVLO)
Low Variation Due to Load and Line Regulation
Output Stable with Low ESR Capacitors
SOT-23-5
Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Processor Power-Up Sequencing
Laptop, Notebook, and Palmtop Computers
Ordering Information
RT9181-
Package Type
B : SOT-23-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
Default : 1.2V
18 : 1.8V
Pin Configurations
(TOP VIEW)
VIN
GND
EN
1
2
3
4
PGOOD
5
VOUT
SOT-23-5
Note :
RichTek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
Typical Application Circuit
10K
V
IN
1
+
C
IN
1uF
VIN
PGOOD
4
PGOOD
Chip Enable
3
EN
VOUT
GND
2
5
C
OUT
1uF
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
V
OUT
DS9181-14 March 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
