®
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,
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)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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 products are :
½
Features
Low-Noise for RF Application
Fast Response in Line/Load Transient
Quick Start-Up (Typically 50μs)
μ
< 0.01μA Standby Current When Shutdown
μ
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
μ
High Power Supply Rejection Ratio
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
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.
½
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Applications
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
is a registered trademark of Richtek Technology Corporation.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
DS9198/A-15 July 2015
www.richtek.com
1
RT9198/A
Pin Configurations
(TOP VIEW)
VOUT
5
2
NC
4
3
VIN
5
2
VOUT
4
3
NC
5
2
VOUT
4
3
VIN
3
2
VIN GND EN/EN
EN/EN
NC GND
EN/EN GND VIN
GND
VOUT
TSOT-23-5/SOT-23-5/
SC-70-5 (R-Type)
TSOT-23-5/SOT-23-5/
SC-70-5
TSOT-23-5/
SOT-23-5(G-Type)
VIN
VOUT
3
2
TSOT-23-3/
SOT-23-3
EN/EN
GND
VIN
1
2
3
6
5
4
7
NC
NC
VOUT
NC
NC
GND
VIN
8
2
3
4
7
6
5
EN/EN
NC
NC
VOUT
4
WDFN-6L 2x2
Typical Application Circuit
RT9198
V
IN
C
IN
1uF
VIN
VOUT
C
OUT
1uF
EN
GND
V
OUT
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
GND
EN/EN
GND
MSOP-8
SC-82
Chip Enable
On
Off
RT9198A
V
IN
C
IN
1uF
VIN
VOUT
C
OUT
1uF
EN
GND
V
OUT
Chip Enable
Off
On
is a registered trademark of Richtek Technology Corporation.
DS9198/A-15 July 2015
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
100k 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
100k resistor connected to VIN when the control signal is floating.
No Internal Connection.
Ground. The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Output Voltage.
Input Voltage.
Function Block Diagram
EN/EN
Shutdown
and
Logic Control
V
REF
-
+
Error
Amplifier
VIN
MOS Driver
VOUT
Current-Limit
and
Thermal
Protection
GND
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9198/A-15 July 2015
www.richtek.com
3
RT9198/A
Absolute Maximum Ratings
(Note 1)
6V
400mW
300mW
625mW
606mW
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5 -------------------------------------------------------------------------
SC-70-5, SC-82 ------------------------------------------------------------------------------------------------------------
MSOP-8 ---------------------------------------------------------------------------------------------------------------------
WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5,
θ
JA
-------------------------------------------------------------------- 250°C/W
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5,
θ
JC
------------------------------------------------------------------- 135°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 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V
(Note 4)
2.5V to 5.5V
0V to 5.5V
−40°C
to 125°C
−40°C
to 85°C
Recommended Operating Conditions
Supply Input Voltage ------------------------------------------------------------------------------------------------------
EN Input Voltage -----------------------------------------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
Parameter
Output Voltage Accuracy
Current Limit
Quiescent Current
Dropout Voltage
Line Regulation
Load Regulation
Shutdown Current
EN Input Bias Current
(Note 5)
(V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified)
Symbol
V
OUT
I
LIM
I
Q
V
DROP
V
LINE
V
LOAD
I
SHDN
I
IBEN
Test Conditions
I
OUT
= 1mA
R
LOAD
= 1
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
Unit
%
mA
A
mV
%
%
A
nA
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9198/A-15 July 2015
RT9198/A
Parameter
Logic-Low
Voltage
Logic-High
Voltage
Symbol
V
IL
V
IH
PSRR
T
SD
T
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
= 1F, I
OUT
= 100mA
Min
--
1.2
--
--
--
--
Typ
--
--
60
30
165
30
Max
0.4
V
--
--
--
--
--
dB
C
C
Unit
EN Threshold
Power Supply f = 100Hz
Rejection Rate f = 10kHz
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
Note 1.
Stresses beyond those listed
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may affect
device reliability.
Note 2.
θ
JA
is measured at T
A
= 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3.
θ
JC
is
measured at the exposed pad of the package.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9198/A-15 July 2015
www.richtek.com
5
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