RT9198A-16GB [RICHTEK]
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator; 300mA，低噪音，超高速的CMOS LDO稳压器
| 型号： | RT9198A-16GB |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | 300mA, Low Noise, Ultra-Fast CMOS LDO Regulator |
| 文件： | 总15页 (文件大小：251K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9198/A
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator
General Description
Features
z Low-Noise for RF Application
The RT9198/A is designed for portable RF and wireless
applications with demanding performance and space
requirements. The RT9198/Aperformance 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-6L2x2 packages, the RT9198/
A also offers a range from 1.5V to 5.0V with 0.1V per
step.
z Fast Response in Line/Load Transient
z Quick Start-Up (Typically 50μs)
z < 0.01μA Standby Current When Shutdown
z Low Dropout : 220mV @ 300mA
z Wide Operating Voltage Ranges : 2.5V to 5.5V
z TTL-Logic-Controlled Shutdown Input
z Low Temperature Coefficient
z Current Limiting Protection
z Thermal Shutdown Protection
z Only 1μF Output Capacitor Required for Stability
z High Power Supply Rejection Ratio
z Custom Voltage Available
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9198/A-
Package Type
U5 : SC-70-5
Applications
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)
z CDMA/GSM Cellular Handsets
z Battery-Powered Equipment
z Laptop, Palmtops, Notebook Computers
z Hand-Held Instruments
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
z PCMCIA Cards
z Portable InformationAppliances
Output Voltage
15 : 1.5V
16 : 1.6V
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.
:
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.
DS9198/A-10 November 2006
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1
RT9198/A
Pin Configurations
(TOP VIEW)
VIN
3
VIN
4
VOUT
VIN
GND
1
2
5
EN/EN
NC
1
2
5
4
VOUT
VIN
3
2
2
1
1
EN/EN
3
4
NC
3
VOUT
GND
GND
EN/EN
GND
VOUT
SOT-23-5/SC-70-5 (R-Type)
SOT-23-5/SC-70-5
SC-82
SOT-23-3
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.
1
2
3
6
5
4
EN/EN
GND
VIN
NC
NC
VOUT
WDFN-6L 2x2
Typical Application Circuit
RT9198
VIN
VOUT
V
OUT
V
IN
C
IN
C
OUT
1uF
1uF
Chip Enable
On
EN
GND
Off
RT9198A
VIN
VOUT
V
OUT
V
IN
C
IN
C
OUT
1uF
1uF
Chip Enable
Off
GND
EN
On
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DS9198/A-10 November 2006
RT9198/A
Functional Pin Description
Pin Name
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.
EN
EN
NC
GND, Exposed Pad Ground. Exposed pad should be soldered to PCB board and connected to GND.
VOUT
VIN
Output Voltage.
Input Voltage.
Function Block Diagram
EN/EN
Shutdown
and
VIN
Logic Control
V
REF
+
MOS Driver
Error
Amplifier
VOUT
GND
Current-Limit
and
Thermal
Protection
DS9198/A-10 November 2006
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RT9198/A
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage------------------------------------------------------------------------------------------------------ 6V
z Power Dissipation, PD @ TA = 25°C
SOT-23-3/SOT-23-5 ------------------------------------------------------------------------------------------------------- 400mW
SC-70-5, SC-82 ------------------------------------------------------------------------------------------------------------ 300mW
WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------- 606mW
z Package Thermal Resistance (Note 4)
SOT-23-3/SOT-23-5, θJA ------------------------------------------------------------------------------------------------- 250°C/W
SC-70-5, SC-82, θJA ------------------------------------------------------------------------------------------------------ 333°C/W
WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------------- 165°C/W
WDFN-6L 2x2, θJC -------------------------------------------------------------------------------------------------------- 20°C/W
z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 3)
z Supply Input Voltage------------------------------------------------------------------------------------------------------ 2.5V to 5.5V
z EN Input Voltage ----------------------------------------------------------------------------------------------------------- 0V to 5.5V
z Junction Temperature Range-------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range-------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = VOUT + 1V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified)
Parameter
Output Voltage Accuracy
Current Limit
Symbol
Test Conditions
= 1mA
OUT
Min
−2
Typ
--
Max Units
ΔV
I
+2
--
%
OUT
I
R
= 1Ω
LOAD
360
400
mA
LIM
RT9198, V
≧ 1.2V, I
= 0mA
EN
OUT
Quiescent Current
I
Q
--
90
130
μA
RT9198A, V
≦ 0.4V, I
= 0mA
EN
OUT
I
I
= 200mA
--
--
170
220
200
330
OUT
Dropout Voltage (Note 5)
V
DROP
mV
= 300mA
OUT
V
= (V
= 1mA
+ 1V) to 5.5V,
< 300mA
OUT
IN
OUT
Line Regulation
Load Regulation
Shutdown Current
ΔV
ΔV
I
--
--
--
--
--
--
--
0.3
0.6
1
%
%
LINE
I
OUT
1mA < I
LOAD
RT9198, V = GND, Shutdown
RT9198A, V = V , Shutdown
EN
0.01
0
μA
nA
SHDN
IBEN
EN
IN
EN Input Bias Current
Logic-Low
I
V
EN
= GND or V
100
0.4
IN
RT9198, V = 3V to 5.5V, Shutdown
RT9198A, V = 3V to 5.5V, Enable
IN
IN
V
IL
--
Voltage
EN Threshold
V
Logic-High
Voltage
RT9198, V = 3V to 5.5V, Enable
IN
RT9198A, V = 3V to 5.5V, Shutdown
V
IH
1.2
--
--
IN
To be continued
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DS9198/A-10 November 2006
RT9198/A
Parameter
Symbol
Test Conditions
= 1μF, I = 100mA
Min
--
Typ
−60
−30
Max Units
f = 100Hz
f = 10kHz
--
Power Supply
Rejection Rate
PSRR
C
dB
--
OUT
OUT
--
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
T
--
--
165
30
--
--
°C
°C
SD
ΔT
SD
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 recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. 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 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
DS9198/A-10 November 2006
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5
RT9198/A
Typical Operating Characteristics
Quiesent Current vs. Temperature
Output Voltage vs. Temperature
100
95
90
85
80
75
70
65
60
2
RT9198/A-15
VIN = 3.3V
CIN = COUT = 1uF
VIN = 5V
CIN = COUT = 1uF
1.9
1.8
No Load
1.7
1.6
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature
Temperature (°C)
(°C)
EN Pin Shutdown Threshold vs. Temperature
Current Limit vs. Input Voltage
1.5
600
550
500
450
400
350
300
RT9198/A-15
VIN = 3.3V
RT9198/A-15
CIN = COUT = 1uF
CIN = COUT = 1uF
1.25
1
0.75
0.5
0.25
-50
-25
0
25
50
75
100
125
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
(°C)
Temperature
Input Voltage (V)
Dropout Voltage vs. Load Current
PSRR
300
250
200
150
100
50
20
0
RT9198/A-33
CIN = COUT = 1uF
VOUT = 2.5V
CIN = COUT = 1uF, X7R
TJ = 125°C
TJ = 25°C
-20
-40
-60
-80
TJ = -40°C
ILOAD = 100mA
ILOAD = 10mA
0
10
1
100
1K
10K
100K
1M
0
0.05
0.1
0.15
0.2
0.25
0.3
Load Current (A)
Frequency (Hz))
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DS9198/A-10 November 2006
RT9198/A
Line Transient Response
Line Transient Response
CIN = COUT = 1uF
ILOAD = 50mA
CIN = COUT = 1uF
ILOAD = 250mA
5
4
3
5
4
3
20
0
50
0
-20
-50
Time (100μs/Div)
Time (100μs/Div)
Load Transient Response
Load Transient Response
VIN = 3.3V
CIN = COUT = 1uF
VOUT = 1.5V
ILOAD= 1mA to 50mA
VIN = 3.3V
CIN = COUT = 1uF
VOUT = 1.5V
ILOAD = 1mA to 250mA
100
50
0
400
200
0
50
0
50
0
-50
-50
Time (100μs/Div)
Time (100μs/Div)
Start Up
EN Pin Shutdown Response
VOUT = 1.8V
ILOAD = 1mA
VOUT = 1.8V
ILOAD = 1mA
RT9198-18, VIN = 5V
CIN = COUT = 1uF
RT9198-18, VIN = 5V
CIN = COUT = 1uF
10
5
10
5
0
0
2
1
0
2
1
0
Time (10μs/Div)
Time (1ms/Div)
DS9198/A-10 November 2006
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RT9198/A
Noise
Noise
VOUT = 1.8V
ILOAD = 150mA
VOUT = 1.8V
No Load
VIN = 4.5V
CIN = COUT = 1uF
VIN = 4.5V
CIN = COUT = 1uF
400
200
0
400
200
0
-200
-400
-200
-400
f = 10Hz to 100kHz
f = 10Hz to 100kHz
Time (5ms/Div)
Time (5ms/Div)
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DS9198/A-10 November 2006
RT9198/A
Applications Information
Enable Function
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 RT9198/Afeatures an LDO regulator enable/disable
function.
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 ENpin 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 ENpin is higher than 1.2V. 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.
The output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDOs
application. The RT9198/Ais 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/Aoutput 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/Aand returned to a clean analog ground.
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 :
Region of Stable COUT ESR vs. Load Current
100
Instable
Stable
PD = (VIN − VOUT) x IOUT + VIN x IQ
10
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 :
COUT = 1uF
1
0.10
0.01
0.00
PD(MAX) = ( TJ(MAX) - TA ) / θJA
RT9198/A-15CU5
COUT = 1μF, X7R
Simulation Verify
Where TJ(MAX) is the maximum operating junction
temperature 125°C, TAis the ambient temperature and the
θJA is the junction to ambient thermal resistance.
0
50
100
150
200
250
300
Load Current (mA)
Figure 1
DS9198/A-10 November 2006
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9
Instable
RT9198/A
For recommended operating conditions specification of
RT9198/A, where TJ(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 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 (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
ambient temperature for fixed TJ(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
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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DS9198/A-10 November 2006
RT9198/A
Outline Dimension
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
1.803
0.080
0.300
1.295
0.152
1.803
0.508
2.997
3.099
2.007
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.071
0.003
0.012
0.051
0.006
0.071
0.020
0.118
0.122
0.079
0.010
0.024
b
C
D
e
H
L
SOT-23-3 Surface Mount Package
DS9198/A-10 November 2006
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11
RT9198/A
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
SOT-23-5 Surface Mount Package
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DS9198/A-10 November 2006
RT9198/A
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
1.800
1.800
1.100
0.100
1.350
0.400
2.450
2.250
0.031
0.000
0.045
0.006
0.071
0.071
0.044
0.004
0.054
0.016
0.096
0.089
b
C
D
e
0.650
0.026
H
L
0.080
0.210
0.260
0.460
0.003
0.008
0.010
0.018
SC-70-5 Surface Mount Package
DS9198/A-10 November 2006
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RT9198/A
D
e
H
L
B
C
A
b1
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
0.350
1.800
1.800
1.100
0.100
1.350
0.400
0.500
2.450
2.200
0.031
0.000
0.045
0.006
0.014
0.071
0.071
0.043
0.004
0.053
0.016
0.020
0.096
0.087
b
b1
C
D
e
1.300
0.051
H
L
0.080
0.200
0.260
0.460
0.003
0.008
0.010
0.018
SC-82 Surface Mount Package
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DS9198/A-10 November 2006
RT9198/A
D
D2
L
E
E2
SEE DETAIL A
1
b
e
2
1
2
1
A
A3
A1
DETAILA
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
A1
A3
b
0.700
0.000
0.175
0.200
1.950
1.000
1.950
0.500
0.800
0.050
0.250
0.350
2.050
1.450
2.050
0.850
0.028
0.000
0.007
0.008
0.077
0.039
0.077
0.020
0.031
0.002
0.010
0.014
0.081
0.057
0.081
0.033
D
D2
E
E2
e
0.650
0.026
L
0.300
0.400
0.012
0.016
W-Type 6L DFN 2x2 Package
RICHTEK TECHNOLOGYCORP.
RICHTEK TECHNOLOGYCORP.
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
DS9198/A-10 November 2006
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15
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