RT9198/A
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator
General Description
Ordering Information
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.
RT9198/A-
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
Features
z
z
z
z
z
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z
z
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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
Applications
z
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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)
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.
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
DS9198/A-14 April 2011
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1
RT9198/A
Pin Configurations
(TOP VIEW)
VOUT
NC
VIN
VOUT
NC
VOUT
VIN
5
4
5
4
5
4
3
2
3
2
VIN GND EN/EN
EN/EN
3
2
3
2
EN/EN GND VIN
NC GND
GND
VOUT
TSOT-23-5/SOT-23-5/
TSOT-23-5/SOT-23-5/
TSOT-23-5/
TSOT-23-3/
SC-70-5 (R-Type)
SC-70-5
SOT-23-5(G-Type)
SOT-23-3
1
2
3
GND
EN/EN
GND
VIN
7
6
5
4
NC
NC
VOUT
NC
NC
GND
VIN
8
2
7
3
6
4
5
EN/EN
NC
NC
VOUT
VIN
VOUT
4
3
2
EN/EN
WDFN-6L 2x2
MSOP-8
GND
SC-82
Typical Application Circuit
RT9198
VIN
CIN
1uF
Chip Enable
On
VIN
VOUT
COUT
1uF
EN
VOUT
GND
Off
RT9198A
VIN
CIN
1uF
Chip Enable
Off
VIN
VOUT
COUT
1uF
EN
VOUT
GND
On
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2
DS9198/A-14 April 2011
RT9198/A
Functional Pin Description
Pin Name
Pin Function
EN
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.
EN
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.
NC
No Internal Connection.
GND, Exposed Pad
Ground. The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
VOUT
Output Voltage.
VIN
Input Voltage.
Function Block Diagram
EN/EN
Shutdown
and
Logic Control
VIN
VREF
-
MOS Driver
+
Error
Amplifier
VOUT
Current-Limit
and
Thermal
Protection
GND
DS9198/A-14 April 2011
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3
RT9198/A
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage ---------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5 -----------------------------------------------------------------------SC-70-5, SC-82 ---------------------------------------------------------------------------------------------------------MSOP-8 ------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 ------------------------------------------------------------------------------------------------------------z Package Thermal Resistance (Note 2)
TSOT-23-3/TSOT-23-5/SOT-23-3/SOT-23-5, θJA ------------------------------------------------------------------SC-70-5, SC-82, θJA ----------------------------------------------------------------------------------------------------MSOP-8, θJA -------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJA ------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJC ------------------------------------------------------------------------------------------------------z Junction Temperature --------------------------------------------------------------------------------------------------z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------z Storage Temperature Range ------------------------------------------------------------------------------------------z ESD Susceptibility (Note 3)
HBM (Human Body Mode) --------------------------------------------------------------------------------------------MM (Machine Mode) ---------------------------------------------------------------------------------------------------z
6V
z
Recommended Operating Conditions
z
z
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z
400mW
300mW
625mW
606mW
250°C/W
333°C/W
160°C/W
165°C/W
20°C/W
150°C
260°C
−65°C to 150°C
2kV
200V
(Note 4)
Supply Input Voltage ---------------------------------------------------------------------------------------------------EN Input Voltage --------------------------------------------------------------------------------------------------------Junction Temperature Range -----------------------------------------------------------------------------------------Ambient Temperature Range ------------------------------------------------------------------------------------------
2.5V to 5.5V
0V to 5.5V
−40°C to 125°C
−40°C to 85°C
Electrical Characteristics
(VIN = VOUT + 1V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Output Voltage Accuracy
ΔVOUT
Current Limit
ILIM
Quiescent Current
Dropout Voltage
IQ
(Note 5)
VDROP
Test Conditions
Min
Typ
Max
Unit
IOUT = 1mA
−2
--
+2
%
R LOAD = 1Ω
360
400
--
mA
μA
RT9198, VEN ≧ 1.2V, IOUT = 0mA
RT9198A, VEN ≦ 0.4V, IOUT = 0mA
IOUT = 200mA
--
90
130
--
170
200
IOUT = 300mA
--
220
330
mV
Line Regulation
ΔVLINE
V IN = (VOUT + 1V) to 5.5V,
IOUT = 1mA
--
--
0.3
%
Load Regulation
ΔVLOAD
1mA < IOUT < 300mA
--
--
0.6
%
Shutdown Current
ISHDN
RT9198, VEN = GND, Shutdown
RT9198A, VEN = VIN, Shutdown
--
0.01
1
μA
EN Input Bias Current
IIBEN
V EN = GND or VIN
--
0
100
nA
To be continued
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4
DS9198/A-14 April 2011
RT9198/A
Parameter
EN Threshold
Logic-Low
Voltage
Logic-High
Voltage
Power Supply f = 100Hz
Rejection Rate f = 10kHz
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
Symbol
Test Conditions
VIL
RT9198, VIN = 3V to 5.5V, Shutdown
RT9198A, VIN = 3V to 5.5V, Enable
VIH
RT9198, VIN = 3V to 5.5V, Enable
RT9198A, VIN = 3V to 5.5V, Shutdown
PSRR
C OUT = 1μF, IOUT = 100mA
Min
Typ
Max
--
--
0.4
Unit
V
1.2
--
--
--
−60
--
--
−30
--
TSD
--
165
--
°C
ΔTSD
--
30
--
°C
dB
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. θJA is measured in the natural convection at TA = 25°C on a low effective single layers thermal conductivity test board
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.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
DS9198/A-14 April 2011
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5
RT9198/A
Typical Operating Characteristics
Quiesent Current vs. Temperature
Output Voltage vs. Temperature
100
VIN = 5V
CIN = COUT = 1uF
RT9198/A-15
VIN = 3.3V
CIN = COUT = 1uF
95
Quiescent Current (uA)
Output Voltage (V)
2
1.9
1.8
No Load
1.7
90
85
80
75
70
65
60
1.6
-50
-25
0
25
50
75
100
-50
125
-25
0
EN Pin Shutdown Threshold vs. Temperature
Current Limit (mA)
EN Pin Threshold Voltage (V)
0.75
0.5
125
RT9198/A-15
CIN = COUT = 1uF
500
450
400
350
0.25
300
-50
-25
0
25
50
75
100
125
2
2.5
3
Temperature (°C)
20
RT9198/A-33
CIN = COUT = 1uF
3.5
4
4.5
5
5.5
6
6.5
Input Voltage (V)
Dropout Voltage vs. Load Current
TJ = 125°C
250
PSRR
VOUT = 2.5V
CIN = COUT = 1uF, X7R
0
200
TJ = 25°C
PSRR (dB)
Dropout Voltage (mV)
100
550
1
300
75
Current Limit vs. Input Voltage
600
RT9198/A-15
VIN = 3.3V
CIN = COUT = 1uF
1.25
50
Temperature (°C)
Temperature (°C)
1.5
25
150
TJ = -40°C
100
-20
-40
ILOAD = 100mA
-60
50
ILOAD = 10mA
-80
0
0
0.05
0.1
0.15
0.2
Load Current (A)
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6
0.25
0.3
10
0.01
100
0.1
1K
1
10K
10
100K
100
1M
1000
Frequency (kHz)
(Hz)
DS9198/A-14 April 2011
RT9198/A
Line Transient Response
ILOAD = 50mA
4
3
Input Voltage
Deviation (V)
CIN = COUT = 1uF
5
Output Voltage
Deviation (mV)
Output Voltage
Deviation (mV)
Input Voltage
Deviation (V)
Line Transient Response
20
0
-20
CIN = COUT = 1uF
4
3
50
0
-50
Time (100μs/Div)
Time (100μs/Div)
Output Voltage
Deviation (mV)
0
50
0
-50
10
Load Current
(mA)
50
VIN = 3.3V
CIN = COUT = 1uF
VOUT = 1.5V
ILOAD = 1mA to 250mA
200
0
50
0
-50
Time (100μs/Div)
Start Up
EN Pin Shutdown Response
RT9198-18, VIN = 5V
CIN = COUT = 1uF
5
0
2
1
0
Time (10μs/Div)
DS9198/A-14 April 2011
400
Time (100μs/Div)
VOUT = 1.8V
ILOAD = 1mA
Output Voltage
(V)
EN Pin Voltage
(V)
Output Voltage
(V)
VOUT = 1.5V
ILOAD= 1mA to 50mA
Load Transient Response
EN Pin Voltage
(V)
100
Output Voltage
Deviation (mV)
Load Current
(mA)
Load Transient Response
VIN = 3.3V
CIN = COUT = 1uF
ILOAD = 250mA
5
10
VOUT = 1.8V
ILOAD = 1mA
RT9198-18, VIN = 5V
CIN = COUT = 1uF
5
0
2
1
0
Time (1ms/Div)
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RT9198/A
Noise
Noise
VOUT = 1.8V
ILOAD = 150mA
400
400
200
200
0
-200
-400
0
-200
-400
f = 10Hz to 100kHz
Time (5ms/Div)
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8
VOUT = 1.8V
No Load
VIN = 4.5V
CIN = COUT = 1uF
Noise (μV)
Noise (μV)
VIN = 4.5V
CIN = COUT = 1uF
f = 10Hz to 100kHz
Time (5ms/Div)
DS9198/A-14 April 2011
RT9198/A
Applications Information
Like any low-dropout regulator, the external capacitors used
for the RT9198/A must be carefully selected for regulator
stability and performance. Using a capacitor whose value
is > 1μF on the RT9198/A input and the amount of
capacitance can be increased without limit. The input
capacitor must be located a distance of not more than
0.5 inch from the input pin of the IC and returned to a
clean analog ground. Any good quality ceramic or tantalum
can be used for this capacitor. The capacitor with larger
value and lower ESR (equivalent series resistance) provides
better PSRR and line-transient response.
The output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDOs
application. The RT9198/A is designed specifically to work
with low ESR ceramic output capacitor in space-saving
and performance consideration. Using a ceramic capacitor
whose value is at least 1μF with ESR is more than 20mΩ
on the RT9198/A output ensures stability. The RT9198/A
still works well with output capacitor of other types due to
the wide stable ESR range. Figure 1. shows the curves of
allowable ESR range as a function of load current for various
output capacitor values. Output capacitor of larger
capacitance can reduce noise and improve load transient
response, stability, and PSRR. The output capacitor should
be located with in 0.5 inch from the VOUT pin of the
RT9198/A and returned to a clean analog ground.
Region of Stable COUT ESR vs. Load Current
100.00
100
Instable
C OUT ESR (Ω)
10
10.00
Stable
0.10
0.01
0.00
RT9198/A-15xU5
COUT = 1μF, X7R
0
50
150
200
Load Current (mA)
To assure the RT9198 LDO regulator will switch on, the
EN turn on control level must be greater than 1.2V. The
RT9198 LDO regulator will go into shutdown mode when
the voltage on the EN pin falls below 0.4V. For RT9198A,
the EN turn on control level must be lower than 0.4V to
assure the RT9198A LDO regulator switch on. The
RT9198A LDO regulator will go into shutdown mode when
the voltage on the EN pin is higher than 1.2 V. The RT9198A
equips a quick-discharge function to protect the system.
When the regulator is turned off by EN pin, the internal
MOSFET between VOUT and GND will be turned on to
discharge output voltage quickly. If the enable function is
not needed in a specific application, it may be tied to
GND/VIN to keep the LDO regulator in a continuously on
state.
Thermal Considerations
Thermal protection limits power dissipation in RT9198/A.
When the operating junction temperature exceeds 165°C,
the OTP circuit starts the thermal shutdown function and
turns the pass element off. The pass element turns on
again after the junction temperature cools by 30°C.
For continuous operation, do not exceed absolute
maximum operatiog junction temperature 125°C. The
power dissipation definition in device is shown as following
formula :
250
The maximum power dissipation depends on the thermal
resistance of IC package, PCB layout, the rate of
surroundings airflow and temperature difference between
junction to ambient. The maximum power dissipation can
be calculated by following formula :
PD(MAX) = ( TJ(MAX) - TA ) / θJA
Simulation Verify
100
The RT9198/A features an LDO regulator enable/disable
function.
PD = (VIN − VOUT) x IOUT + VIN x IQ
COUT = 1uF
1.001
Enable Function
300
Where T J(MAX) is the maximum operating junction
temperature 125°C, TA is the ambient temperature and the
θJA is the junction to ambient thermal resistance.
Figure 1
DS9198/A-14 April 2011
Instable
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9
RT9198/A
For recommended operating conditions specification of
RT9198/A, where T J(MAX) is the maximum junction
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) for TSOT-23-3/TSOT23-5/SOT-23-3/SOT-23-5 package is 250°C/W, SC-70-5
and SC-82 package is 333°C/W and WDFN-6L 2x2
package is 165°C/W on standard JEDEC 51-3 thermal
test board. The maximum power dissipation at TA = 25°C
can be calculated by following formula :
PD(MAX) = (125°C − 25°C)/250 = 400mW (TSOT-23-3/
TSOT-23-5/SOT-23-3/SOT-23-5)
PD(MAX) = (125°C − 25°C)/333 = 300mW (SC-70-5/SC-82)
PD(MAX) = (125°C − 25°C) / 165 = 606mW (WDFN-6L 2x2)
The maximum power dissipation depends on operating
Maximum Power Dissipation (mW) 1
ambient temperature for fixed T J(MAX) and thermal
resistance θJA. For RT9198/A packages, the Figure 2. of
derating curves allows the designer to see the effect of
rising ambient temperature on the maximum power
allowed.
700
WDFN-6L 2x2
600
500
SOT-23-3/SOT-23-5
TSOT-23-3/TSOT-23-5
400
300
SC 70-5
SC-82
200
100
0
0
15
30
45
60
75
90
105
120
135
Ambient Temperature (°C)
Figure 2. Derating Curve for Packages
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10
DS9198/A-14 April 2011
RT9198/A
Outline Dimension
H
D
L
C
B
e
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.508
0.014
0.020
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
1.803
2.007
0.071
0.079
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
SOT-23-3 Surface Mount Package
DS9198/A-14 April 2011
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11
RT9198/A
H
D
L
B
C
b
A
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.559
0.014
0.022
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
0.838
1.041
0.033
0.041
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
SOT-23-5 Surface Mount Package
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DS9198/A-14 April 2011
RT9198/A
H
D
L
C
B
e
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.700
1.000
0.028
0.039
A1
0.000
0.100
0.000
0.004
B
1.397
1.803
0.055
0.071
b
0.300
0.510
0.012
0.020
C
2.591
3.000
0.102
0.118
D
2.692
3.099
0.106
0.122
e
1.803
2.007
0.071
0.079
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
TSOT-23-3 Surface Mount Package
DS9198/A-14 April 2011
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RT9198/A
H
D
L
B
C
b
A
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.700
1.000
0.028
0.039
A1
0.000
0.100
0.000
0.004
B
1.397
1.803
0.055
0.071
b
0.300
0.559
0.012
0.022
C
2.591
3.000
0.102
0.118
D
2.692
3.099
0.106
0.122
e
0.838
1.041
0.033
0.041
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
TSOT-23-5 Surface Mount Package
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DS9198/A-14 April 2011
RT9198/A
H
D
L
B
C
b
A
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.800
1.100
0.031
0.044
A1
0.000
0.100
0.000
0.004
B
1.150
1.350
0.045
0.054
b
0.150
0.400
0.006
0.016
C
1.800
2.450
0.071
0.096
D
1.800
2.250
0.071
0.089
e
0.650
0.026
H
0.080
0.260
0.003
0.010
L
0.210
0.460
0.008
0.018
SC-70-5 Surface Mount Package
DS9198/A-14 April 2011
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RT9198/A
D
e
H
L
B
C
b1
b
A
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.800
1.100
0.031
0.043
A1
0.000
0.100
0.000
0.004
B
1.150
1.350
0.045
0.053
b
0.150
0.400
0.006
0.016
b1
0.350
0.500
0.014
0.020
C
1.800
2.450
0.071
0.096
D
1.800
2.200
0.071
0.087
e
1.300
0.051
H
0.080
0.260
0.003
0.010
L
0.200
0.460
0.008
0.018
SC-82 Surface Mount Package
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DS9198/A-14 April 2011
RT9198/A
D
L
E1
E
e
A2
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.810
1.100
0.032
0.043
A1
0.000
0.150
0.000
0.006
A2
0.750
0.950
0.030
0.037
b
0.220
0.380
0.009
0.015
D
2.900
3.100
0.114
0.122
e
0.650
0.026
E
4.800
5.000
0.189
0.197
E1
2.900
3.100
0.114
0.122
L
0.400
0.800
0.016
0.031
8-Lead MSOP Plastic Package
DS9198/A-14 April 2011
www.richtek.com
17
RT9198/A
D2
D
L
E
E2
1
e
b
A
A1
SEE DETAIL A
2
1
2
1
A3
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.175
0.250
0.007
0.010
b
0.200
0.350
0.008
0.014
D
1.950
2.050
0.077
0.081
D2
1.000
1.450
0.039
0.057
E
1.950
2.050
0.077
0.081
E2
0.500
0.850
0.020
0.033
e
L
0.650
0.300
0.026
0.400
0.012
0.016
W-Type 6L DFN 2x2 Package
Richtek Technology Corporation
Richtek Technology Corporation
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
5F, No. 95, Minchiuan Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
www.richtek.com
18
DS9198/A-14 April 2011
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