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RT9181 Datasheet Preview

RT9181 Datasheet

150mA LDO Regulator

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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
z Low Dropout Voltage Regulator
z Up to 150mA Output Current
z Power Good (PGOOD) Function
z Chip Enable/Shutdown Function
z Load Independent, Low Quiescent Current, 160μA
z Current Limiting and Thermal Protection
z Under Voltage Lockout (UVLO)
z Low Variation Due to Load and Line Regulation
z Output Stable with Low ESR Capacitors
z SOT-23-5 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Processor Power-Up Sequencing
z Laptop, Notebook, and Palmtop Computers
Ordering Information
RT9181-
Pin Configurations
(TOP VIEW)
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
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.
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.
VIN 1 5 VOUT
GND 2
EN 3 4 PGOOD
SOT-23-5
Typical Application Circuit
VIN CIN
1uF
1 VIN PGOOD 4
Chip Enable 3 EN VOUT 5
GND
2
10K
PGOOD
VOUT
COUT
1uF
DS9181-14 March 2007
www.richtek.com
1




Richiek

RT9181 Datasheet Preview

RT9181 Datasheet

150mA LDO Regulator

No Preview Available !

RT9181
Function Block Diagram
VIN
Shutdown
Undervoltage
Current
EN
Control
Lockout
Limit
Thermal
Control
Gate
Control
VREF
+
Fault
Output Voltage
Detection
GOOD
Delay
Timer
Power Good
Control
Functional Pin Description
Pin Name
VIN
GND
EN
PGOOD
VOUT
Pin Function
Power Input Voltage
Ground
Chip Enable (Active High)
Power Good Indicator
Output Voltage
Timing Diagram
VOUT
90% max of VOUT (normal)
VPGOODH
tD (PG) 2.0ms typ.
PGOOD
www.richtek.com
2
VOUT
PGOOD
GND
VPGOODL
85% min of VOUT (normal)
DS9181-14 March 2007


Part Number RT9181
Description 150mA LDO Regulator
Maker Richiek
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RT9181 Datasheet PDF






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