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/A also offers a range
from 1.5V to 5.0V with 0.1V per step.
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)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial 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)
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.
Features
Low-Noise for RF Application
Fast Response in Line/Load Transient
Quick Start-Up (Typically 50us)
< 0.01uA 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 1uF Output Capacitor Required for Stability
High Power Supply Rejection Ratio
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
Marking Information
Applications
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
DS9198/A-12 May 2008
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
www.richtek.com
1
RT9198/A
Absolute Maximum Ratings
Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5 ------------------------------------------------------------------------- 400mW
SC-70-5, SC-82 ------------------------------------------------------------------------------------------------------------ 300mW
MSOP-8 --------------------------------------------------------------------------------------------------------------------- 625mW
WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------- 606mW
Package Thermal Resistance (Note 4)
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5,
θ
JA
-------------------------------------------------------------------- 250°C/W
SC-70-5, SC-82,
θ
JA
------------------------------------------------------------------------------------------------------ 333°C/W
MSOP-8,
θ
JA
---------------------------------------------------------------------------------------------------------------- 160°C/W
WDFN-6L 2x2,
θ
JA
--------------------------------------------------------------------------------------------------------- 165°C/W
WDFN-6L 2x2,
θ
JC
-------------------------------------------------------------------------------------------------------- 20°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
(Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 6V
Recommended Operating Conditions
(Note 3)
2.5V to 5.5V
0V to 5.5V
−40°C
to 125°C
−40°C
to 85°C
Supply Input Voltage ------------------------------------------------------------------------------------------------------
EN Input Voltage -----------------------------------------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Output Voltage Accuracy
Current Limit
Quiescent Current
Dropout Voltage (Note 5)
Line Regulation
Load Regulation
Shutdown Current
EN Input Bias Current
Symbol
ΔV
OUT
I
LIM
I
Q
V
DROP
ΔV
LINE
ΔV
LOAD
I
SHDN
I
IBEN
Test Conditions
I
OUT
= 1mA
R
LOAD
= 1Ω
RT9198, V
EN
≧
1.2V, I
OUT
= 0mA
RT9198A, V
EN
≦
0.4V, I
OUT
= 0mA
I
OUT
= 200mA
I
OUT
= 300mA
V
IN
= (V
OUT
+ 1V) to 5.5V,
I
OUT
= 1mA
1mA < I
OUT
< 300mA
RT9198, V
EN
= GND, Shutdown
RT9198A, V
EN
= V
IN
, Shutdown
V
EN
= GND or V
IN
Min
−2
360
--
--
--
--
--
--
--
Typ
--
400
90
170
220
--
--
0.01
0
Max
+2
--
130
200
330
0.3
0.6
1
100
Units
%
mA
μA
mV
%
%
μA
nA
To be continued
www.richtek.com
4
DS9198/A-12 May 2008
RT9198/A
Parameter
Logic-Low
Voltage
Logic-High
Voltage
Symbol
V
IL
V
IH
PSRR
T
SD
ΔT
SD
Test Conditions
RT9198, V
IN
= 3V to 5.5V, Shutdown
RT9198A, V
IN
= 3V to 5.5V, Enable
RT9198, V
IN
= 3V to 5.5V, Enable
RT9198A, V
IN
= 3V to 5.5V, Shutdown
C
OUT
= 1μF, I
OUT
= 100mA
Min
--
1.2
--
--
--
--
Typ
--
--
−60
−30
165
30
Max
0.4
V
--
--
--
--
--
dB
°C
°C
Units
EN Threshold
Power Supply f = 100Hz
Rejection Rate f = 10kHz
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
Note 1.
Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
Devices are ESD sensitive. Handling precaution is recommended.
Note 3.
The device is not guaranteed to function outside its operating conditions.
Note 4.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective single layers thermal conductivity test board
of JEDEC 51-3 thermal measurement standard. The case point of
θ
JC
is on the exposed pad for the package.
Note 5.
The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
DS9198/A-12 May 2008
www.richtek.com
5
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