RT9178
200mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator
General Description
The RT9178 is designed for portable RF and wireless
applications with demanding performance and space
requirements.
The RT9178’ s performance is optimized for battery-
powered systems to deliver ultra low noise and low
quiescent current. A noise bypass pin is also available for
further reduction of output noise. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life. The RT9178 also works with low-ESR ceramic
capacitors, reducing the amount of board space necessary
for power applications, critical in hand-held wireless
devices.
The RT9178 consumes less than 0.01uA in shutdown mode
and has fast turn-on time less than 100us. The other
features include ultra low dropout voltage, high output
accuracy, current limiting protection, and high ripple
rejection ratio. Available in the SOT-23-5 package.
Features
Ultra-Low-Noise for RF Application
Ultra-Fast Response in Line/Load Transient
Quick Start-Up (Typically 100us)
< 0.01uA Quiescent Current When Shutdown
Low Dropout : 200mV at 200mA
Wide Operating Voltage Ranges : 2.5V to 6.0V
TTL-Logic-Controlled Shutdown Input
Low Temperature Coefficient
Current Limiting Protection
Thermal Shutdown Protection
Only 1uF Output Capacitor Required for Stability
High Power Supply Rejection Ratio
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
Ordering Information
RT9178-
Package Type
B : SOT-23-5
BR : SOT-23-5 (R-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
24 : 2.4V
25 : 2.5V
:
31 : 3.1V
32 : 3.2V
2H : 2.85V
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.
Pin Configurations
(TOP VIEW)
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.
VIN
GND
EN
1
2
3
5
VOUT
VOUT
GND
1
2
3
5
BP
4
BP
VIN
4
EN
SOT-23-5
R-Type
SOT-23-5
DS9178-16 April 2008
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
