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RT9177A Datasheet Preview

RT9177A Datasheet

Ultra-Low-Noise 200mA/500mA LDO Regulator

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Preliminary
RT9177/A
Ultra-Low-Noise 200mA/500mA LDO Regulator
General Description
Features
The RT9177/A is a 200mA/500mA low dropout and low
noise micro-power regulator suitable for portable RF
applications. The output voltage accuracy is within ±2%
and range from 2.4V to 3.2V in 100mV increments could
be selected. It is designed for using very low ESR output
capacitor. Its output remains stable even when using a
1μF ceramic as its output capacitor.
With an internal PMOS as the pass device, it does not
need extra GND current in heavy load and dropout
conditions. In shutdown mode, nearly zero operation
current makes the IC suitable for battery-power devices.
Other features including current limiting and over
temperature protection. The noise performance can be
improved by connecting a capacitor to the bypass pin.
Ordering Information
RT9177/A-
z Ultra-Low-Noise (150nV/ Hz ) for RF Application
z 1μF Ceramic COUT Stable
z Low Dropout Voltage (220mV @ 200mA)
z Low Operation Current - 80μA Typical
z Shutdown Function
z Low Temperature Coefficient
z Current and Thermal Limiting
z Customized Voltage Available
z SOT-23-5 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Cellular Phones
z Laptop, Notebook, and Palmtop Computers
z Battery-powered Equipment
z Hand-held Equipment
Marking Information
Package Type
B : SOT-23-5 (Type - I)
BR : SOT-23-5 (Type - II)
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Pin
Configurations
Output Voltage
24 : 2.4V
25 : 2.5V
:
31 : 3.1V
32 : 3.2V
2H : 2.85V
500mA Output Current
200mA Output Current
(TOP VIEW)
VIN 1
GND 2
5 VOUT
EN 3 4 BP
SOT-23-5 (Type - I)
Note :
RichTek Pb-free products are :
RoHS compliant and compatible with the current require-
VOUT 1 5 BP
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
GND 2
VIN 3
4 EN
SOT-23-5 (Type - II)
DS9177/A-11 March 2005
www.richtek.com
1




Richiek

RT9177A Datasheet Preview

RT9177A Datasheet

Ultra-Low-Noise 200mA/500mA LDO Regulator

No Preview Available !

RT9177/A
Preliminary
Typical Application Circuit
VIN CIN
1uF
RT9177/A
IN OUT
GND
Chip Enable
EN
BP
COUT VOUT
1uF
CBP
10nF
Functional Pin Description
Pin Name Pin Function
VIN Power Input Voltage
GND
Ground
EN Chip Enable (Active High)
BP Reference Noise Bypass
VOUT
Output Voltage
Function Block Diagram
EN Shutdown
and
Logic Control
VREF
BP + MOS Driver
Error
Amplifier
Current-Limit and
Thermal Protection
VIN
VOUT
R1
R2
GND
www.richtek.com
2
DS9177/A-11 March 2005


Part Number RT9177A
Description Ultra-Low-Noise 200mA/500mA LDO Regulator
Maker Richiek
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RT9177A Datasheet PDF






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