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RT9198/A
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator
General Description
The RT9198/A is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9198/A performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9198/A also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9198/A consumes less than 0.01μA in shutdown mode and has fast turn-on time less than 50μs. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-3, SOT-23-5, SC-70-5, SC-82 and WDFN-6L 2x2 packages, the RT9198/ A also offers a range from 1.5V to 5.0V with 0.1V per step.
Features
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Low-Noise for RF Application Fast Response in Line/Load Transient Quick Start-Up (Typically 50μs) < 0.01μA Standby Current When Shutdown Low Dropout : 220mV @ 300mA Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1μF Output Capacitor Required for Stability High Power Supply Rejection Ratio Custom Voltage Available RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9198/APackage Type U5 : SC-70-5 U5R : SC-70-5 (R-Type) Y : SC-82 V : SOT-23-3 B : SOT- 23-5 BR : SOT- 23-5 (R-Type) QW : WDFN-6L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V 1H : 1.85V 2H : 2.85V 4G : 4.75V Chip Enable Function (Active Low) Chip Enable Function (Active High)
Applications
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CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances
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.
Note : RichTek Pb-free and Green products are : `RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. `Suitable for use in SnPb or Pb-free soldering processes. `100% matte tin (Sn) plating. DS9198/A-10 November 2006 www.richtek.com 1
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RT9198/A
Pin Configurations
(TOP VIEW)
VIN 4 VOUT 3 2 GND
1 GND VIN 3 2 VOUT
VIN GND EN/EN
1 2 3
5
VOUT
EN/EN NC
1 2
5
VIN
1
4
NC
GND
3
4
VOUT
EN/EN
SOT-23-5/SC-70-5 (R-Type)
SOT-23-5/SC-70-5
SC-82
SOT-23-3
EN/EN GND VIN
1 2 3
6 5 4
NC NC VOUT
Note : There is no pin1 indicator on top mark for SC-82 type, and pin 1 will be lower left pin when reading top mark from left to right. Pin2 of SC-82 is wider than other pins.
WDFN-6L 2x2
Typical Application Circuit
RT9198 V IN C IN 1uF VIN VOUT C OUT 1uF EN GND V OUT
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GND
Chip Enable On Off
RT9198A V IN C IN 1uF VIN VOUT C OUT 1uF EN GND V OUT
Chip Enable Off On
DS9198/A-10 November 2006
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RT9198/A
Functional Pin Description
Pin Name EN EN NC GND, Exposed Pad VOUT VIN Pin Function Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. Chip Enable (Active Low). Note that this pin is high impedance. There should be a pull high 100kΩ resistor connected to VIN when the control signal is floating. No Internal Connect. Ground. Exposed pad should be soldered to PCB board and connected to GND. Output Voltage. Input Voltage.
Function Block Diagram
EN/EN Shutdown and Logic Control VREF
+ Error Amplifier
VIN
MOS Driver VOUT Current-Limit and Thermal Protection GND
DS9198/A-10 November 2006
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RT9198/A
Absolute Maximum Ratings
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(Note 1) 6V 400mW 300mW 606mW 250°C/W 333°C/W 165°C/W 20°C/W 150°C 260°C −65°C to 150°C 2kV 200V
Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOT-23-3/SOT-23-5 ------------------------------------------------------------------------------------------------------SC-70-5, SC-82 -----------------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------z Package Thermal Resistance (Note 4) SOT-23-3/SOT-23-5, θJA ------------------------------------------------------------------------------------------------SC-70-5, SC-82, θJA -----------------------------------------------------------------------------------------------------WDFN-6L .