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 0.01uA in shutdown mode and has fast turn-on time less than 50us. 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, TSOT-23-3, TSOT-23-5, SC-70-5, SC-82, MSOP-8 and WDFN-6L 2x2 packages, the RT9198/Aalso offers a range from 1.5V to 5.0V with 0.1V per step.
Features
zLow-Noise for RF Application
zFast Response in Line/Load Transient
zQuick Start-Up (Typically 50us)
z< 0.01uA Standby Current When Shutdown
zLow Dropout : 220mV @ 300mA
zWide Operating Voltage Ranges : 2.5V to 5.5V
zTTL-Logic-Controlled Shutdown Input
zLow Temperature Coefficient
zCurrent Limiting Protection
zThermal Shutdown Protection
zOnly 1uF Output Capacitor Required for Stability
zHigh Power Supply Rejection Ratio
zCustom Voltage Available
zRoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9198/A-
Package 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)
BG : SOT- 23-5 (G-Type) J3 : TSOT- 23-3
J5 : TSOT- 23-5
J5R : TSOT- 23-5 (R-Type)
J5G : TSOT- 23-5 (G-Type) F : MSOP-8
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage 15 : 1.5V
16 : 1.6V
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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)
Note :
Richtek 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.
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
zCDMA/GSM Cellular Handsets
zBattery-Powered Equipment
zLaptop, Palmtops, Notebook Computers
zHand-Held Instruments
zPCMCIA Cards
zPortable Information Appliances
DS9198/A-14 April 2011 |
www.richtek.com |
1
RT9198/A
Pin Configurations
(TOP VIEW)
VOUT |
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NC |
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VIN |
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VOUT |
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NC |
VOUT |
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VIN |
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VIN |
GND EN/EN |
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EN/EN |
NC GND |
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EN/EN GND VIN |
GND |
VOUT |
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TSOT-23-5/SOT-23-5/ |
TSOT-23-5/SOT-23-5/ |
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TSOT-23-5/ |
TSOT-23-3/ |
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SC-70-5 (R-Type) |
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SC-70-5 |
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SOT-23-5(G-Type) |
SOT-23-3 |
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VIN |
VOUT |
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EN/EN |
1 |
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NC |
NC |
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8 |
EN/EN |
4 |
3 |
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GND |
NC |
2 |
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NC |
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GND 2 |
5 |
NC |
GND |
3 |
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6 |
NC |
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VIN 3 |
7 |
4 |
VOUT |
VIN |
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VOUT |
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EN/EN |
GND |
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WDFN-6L 2x2 |
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MSOP-8 |
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SC-82 |
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Typical Application Circuit
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RT9198 |
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VIN |
CIN |
VIN |
VOUT |
VOUT |
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COUT |
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1uF |
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1uF |
Chip Enable |
EN |
GND |
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On |
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Off |
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RT9198A |
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VIN |
CIN |
VIN |
VOUT |
VOUT |
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COUT |
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1uF |
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1uF |
Chip Enable |
EN |
GND |
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Off |
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On |
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www.richtek.com |
DS9198/A-14 April 2011 |
2
RT9198/A
Functional Pin Description
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Pin Name |
Pin Function |
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EN |
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low |
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100kΩ resistor connected to GND when the control signal is floating. |
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Chip Enable (Active Low). Note that this pin is high impedance. There should be a pull high |
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EN |
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100kΩ resistor connected to VIN when the control signal is floating. |
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NC |
No Internal Connection. |
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GND, Exposed Pad |
Ground. The exposed pad must be soldered to a large PCB and connected to GND for |
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maximum power dissipation. |
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VOUT |
Output Voltage. |
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VIN |
Input Voltage. |
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Function Block Diagram |
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EN/EN |
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Shutdown |
VIN |
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and |
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Logic Control |
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VREF |
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- |
MOS Driver |
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+ |
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Error |
VOUT |
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Amplifier |
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Current-Limit |
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and |
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Thermal |
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Protection |
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GND |
DS9198/A-14 April 2011 |
www.richtek.com |
3
RT9198/A
Absolute Maximum Ratings |
(Note 1) |
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z Supply Input Voltage ---------------------------------------------------------------------------------------------------- |
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6V |
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z Power Dissipation, PD @ TA = 25°C |
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TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5 |
------------------------------------------------------------------------ |
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400mW |
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SC-70-5, SC-82 ---------------------------------------------------------------------------------------------------------- |
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300mW |
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MSOP-8 ------------------------------------------------------------------------------------------------------------------- |
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625mW |
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WDFN-6L 2x2 ------------------------------------------------------------------------------------------------------------- |
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606mW |
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z Package Thermal Resistance |
(Note 2) |
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TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5, θJA ------------------------------------------------------------------- |
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250°C/W |
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SC-70-5, SC-82, θJA ----------------------------------------------------------------------------------------------------- |
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333°C/W |
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MSOP-8, θJA -------------------------------------------------------------------------------------------------------------- |
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160°C/W |
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WDFN-6L 2x2, θJA ------------------------------------------------------------------------------------------------------- |
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165°C/W |
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WDFN-6L 2x2, θJC ------------------------------------------------------------------------------------------------------- |
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20°C/W |
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z Junction Temperature --------------------------------------------------------------------------------------------------- |
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150°C |
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z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- |
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260°C |
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z Storage Temperature Range ------------------------------------------------------------------------------------------- |
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−65°C to 150°C |
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z ESD Susceptibility |
(Note 3) |
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HBM (Human Body Mode) --------------------------------------------------------------------------------------------- |
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2kV |
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MM (Machine Mode) ---------------------------------------------------------------------------------------------------- |
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200V |
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Recommended Operating Conditions (Note 4) |
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z Supply Input Voltage ---------------------------------------------------------------------------------------------------- |
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2.5V to 5.5V |
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z EN Input Voltage --------------------------------------------------------------------------------------------------------- |
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0V to 5.5V |
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z Junction Temperature Range ------------------------------------------------------------------------------------------ |
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−40°C to 125°C |
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z Ambient Temperature Range ------------------------------------------------------------------------------------------ |
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−40°C to 85°C |
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Electrical Characteristics |
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(VIN = VOUT + 1V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified) |
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Parameter |
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Symbol |
Test Conditions |
Min |
Typ |
Max |
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Unit |
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Output Voltage Accuracy |
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VOUT |
IOUT = 1mA |
−2 |
-- |
+2 |
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% |
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Current Limit |
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ILIM |
RLOAD = 1Ω |
360 |
400 |
-- |
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mA |
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Quiescent Current |
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IQ |
RT9198, VEN 1.2V, IOUT = 0mA |
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90 |
130 |
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μA |
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RT9198A, VEN 0.4V, IOUT = 0mA |
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Dropout Voltage |
(Note 5) |
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VDROP |
IOUT = 200mA |
-- |
170 |
200 |
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mV |
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IOUT = 300mA |
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220 |
330 |
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Line Regulation |
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VLINE |
VIN = (VOUT + 1V) to 5.5V, |
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0.3 |
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% |
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IOUT = 1mA |
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Load Regulation |
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VLOAD |
1mA < IOUT < 300mA |
-- |
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0.6 |
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% |
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Shutdown Current |
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ISHDN |
RT9198, VEN = GND, Shutdown |
-- |
0.01 |
1 |
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μA |
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RT9198A, VEN = VIN, Shutdown |
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EN Input Bias Current |
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IIBEN |
VEN = GND or VIN |
-- |
0 |
100 |
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nA |
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To be continued |
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www.richtek.com |
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DS9198/A-14 |
April 2011 |
4
RT9198/A
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Logic-Low |
VIL |
RT9198, VIN = 3V to 5.5V, Shutdown |
-- |
-- |
0.4 |
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EN Threshold |
Voltage |
RT9198A, VIN = 3V to 5.5V, Enable |
V |
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Logic-High |
VIH |
RT9198, VIN = 3V to 5.5V, Enable |
1.2 |
-- |
-- |
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Voltage |
RT9198A, VIN = 3V to 5.5V, Shutdown |
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Power Supply |
f = 100Hz |
PSRR |
COUT = 1μF, IOUT = 100mA |
-- |
−60 |
-- |
dB |
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Rejection Rate |
f = 10kHz |
-- |
−30 |
-- |
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Thermal Shutdown |
TSD |
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165 |
-- |
°C |
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Temperature |
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Thermal Shutdown |
TSD |
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30 |
-- |
°C |
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Temperature Hysteresis |
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Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
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stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the |
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operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended |
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periods may remain possibility to affect device reliability. |
Note 2. |
θJA is measured in the natural convection at TA = 25°C on a low effective single layers thermal conductivity test board |
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of JEDEC 51-3 thermal measurement standard. The case point of θJC is on the exposed pad for the package. |
Note 3. Devices are ESD sensitive. Handling precaution is recommended. |
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Note 4. The device is not guaranteed to function outside its operating conditions. |
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Note 5. |
The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. |
DS9198/A-14 April 2011 |
www.richtek.com |
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5 |
RT9198/A
Typical Operating Characteristics
Output Voltage vs. Temperature
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2 |
VIN = 5V |
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CIN = COUT = 1uF |
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(V) |
1.9 |
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Voltage |
1.8 |
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No Load |
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Output |
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1.7 |
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1.6 |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
Temperature (°C)
EN Pin Shutdown Threshold vs. Temperature
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1.5 |
RT9198/A-15 |
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(V) |
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VIN = 3.3V |
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1.25 |
CIN = COUT = 1uF |
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Voltage |
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1 |
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Pin Threshold |
0.75 |
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0.5 |
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EN |
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0.25 |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
Temperature (°C)
Dropout Voltage vs. Load Current
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300 |
RT9198/A-33 |
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250 |
CIN = COUT = 1uF |
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TJ = 125°C |
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(mV) |
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200 |
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Voltage |
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TJ = 25°C |
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150 |
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TJ = -40°C |
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Dropout |
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100 |
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50 |
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0 |
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0 |
0.05 |
0.1 |
0.15 |
0.2 |
0.25 |
0.3 |
Load Current (A)
Quiesent Current vs. Temperature
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100 |
RT9198/A-15 |
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95 |
VIN = 3.3V |
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CIN = COUT = 1uF |
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(uA) |
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90 |
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Current |
85 |
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80 |
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Quiescent |
75 |
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70 |
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65 |
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60 |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
Temperature (°C)
Current Limit vs. Input Voltage
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600 |
RT9198/A-15 |
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550 |
CIN = COUT = 1uF |
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Limit (mA) |
500 |
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450 |
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Current |
400 |
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350 |
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300 |
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2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
6.5 |
Input Voltage (V)
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20 |
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PSRR |
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VOUT = 2.5V |
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CIN = COUT = 1uF, X7R |
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0 |
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(dB) |
-20 |
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PSRR |
-40 |
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ILOAD = 100mA |
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-60 |
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ILOAD = 10mA |
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-80 |
010. 1 |
100.1 |
1K |
10K |
100K |
1M |
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1000 |
Frequency (kHz)
www.richtek.com |
DS9198/A-14 April 2011 |
6