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RT9178 Datasheet

  • RT9178

  • SHDN/BP. Ultra Low-Noise. FTR

  • 236.48KB

  • 12頁(yè)

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Preliminary
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鈥檚 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 0.01碌A(chǔ) in shutdown
mode and has fast turn-on time less than 100碌S. The
other features include ultra low dropout voltage, high
output accuracy, current limiting protection, and high
ripple rejection ratio. Available in the 5-lead SOT-25
package, the RT9178 also offers a range of 2.4V to
3.3V with 0.1V per step.
Features
Ultra-Low-Noise for RF Application
Ultra-Fast Response in Line/Load Transient
Quick Start-Up (Typically 100碌S)
< 0.01碌A(chǔ) Quiescent Current When Shutdown
Low Dropout: 200mV at 200mA
Wide Operating Voltage Ranges: 2.5V ~ 6.0V
TTL-Logic-Controlled Shutdown Input
Low Temperature Coefficient
Current Limiting Protection
Thermal Shutdown Protection
Only 1碌F Output Capacitor Required for Stability
High Power Supply Rejection Ratio
Custom Voltage Available
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-25 Type I
BR : SOT-25 Type II
Operating Temperature Range
C: Commercial Standard
Output Voltage
24 : 2.4V
25 : 2.5V
:
:
33 : 3.3V
Pin Configurations
Part Number
RT9178-
CB
(Plastic SOT-25)
Pin Configurations
TOP VIEW
5
4
1
2
3
1.
2.
3.
4.
5.
VIN
GND
SHDN
BP
OUT
RT9178-
CBR
(Plastic SOT-25)
TOP VIEW
5
4
1
2
3
1.
2.
3.
4.
5.
OUT
GND
VIN
SHDN
BP
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.
DS9178-02 April 2003
www.richtek.com
1

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