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RT9193
300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator
General Description
The RT9193 is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9193 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RT9193 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9193 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 SC-70-5, SOT-23-5, TSOT-23-5, WDFN-6L 2x2 and MSOP-8 packages.
Features
Ultra-Low-Noise for RF Application Ultra-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
CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances
Ordering Information
RT9193Package Type U5 : SC-70-5 B : SOT-23-5 J5 : TSOT-23-5 QW : WDFN-6L 2x2 (W-Type) F : MSOP-8
Marking Information
Operating Temperature Range P : Pb Free with Commercial Standard For marking information, contact our sales representative G : Green (Halogen Free with Commer- directly or through a Richtek distributor located in your cial Standard) area, otherwise visit our website for detail. Output Voltage 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V 1H : 1.85V 2H : 2.85V 4G : 4.75V
Note : Richtek Pb-free and Green 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. 100% matte tin (Sn) plating. DS9193-11 May 2008 www.richtek.com 1
Typical Application Circuit
RT9193 VIN CIN VIN GND EN BP CBP 22nF VOUT COUT VOUT
1uF/X7R Chip Enable
1uF/X7R
RT9193
Pin Configurations
(TOP VIEW)
VIN GND EN 1 2 3 4 BP 5 VOUT
EN GND VIN
1 2 3 7
6 5 4
BP NC VOUT
NC VIN NC VOUT
8 2 3 4 7 6 5
NC EN BP GND
WDFN-6L 2x2 SC-70-5/SOT-23-5/TSOT-23-5
MSOP-8
Functional Pin Description
Pin Name EN BP GND 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. Reference Noise Bypass. Ground . Output Voltage. Power Input Voltage.
Function Block Diagram
EN Quick Start BP VREF +
Error Amplifier
Shutdown and Logic Control
VIN
MOS Driver VOUT Current-Limit and Thermal Protection GND
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RT9193
Absolute Maximum Ratings
(Note 1) 6V 300mW 400mW 606mW 625mW 333C/W 250C/W 165C/W 160C/W 150C 260C -65C to 150C 2kV 200V Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SC-70-5 ---------------------------------------------------------------------------------------------------------------------TSOT-23-5/SOT-23-5 -----------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------MSOP-8 --------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-70-5, JA --------------------------------------------------------------------------------------------------------------TSOT-23-5/SOT-23-5, JA -----------------------------------------------------------------------------------------------WDFN-6L 2x2, JA --------------------------------------------------------------------------------------------------------MSOP-8 JA ---------------------------------------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 3) 2.5V to 5.5V 0V to 5.5V -40C to 125C -40C to 85C
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 Standby Current EN Input Bias Current EN Threshold (Note 5)
(VIN = VOUT + 1V, CIN = COUT = 1F, CBP = 22nF, TA = 25C, unless otherwise specified)
Symbol VOUT ILIM IQ VDROP VLINE
Test Conditions IO UT = 1mA RL OAD = 1 V EN
Min -2 360 --
Typ -400 90 170
Max +2 -130 200 300 0.3 0.6 1 100 0.4 ---
Units % mA A mV % % A nA V VR MS
1.2V, I OUT = 0mA
IO UT = 200mA, VOUT > 2.8V IO UT = 300mA, VOUT > 2.8V V IN = (VOUT + 1V) to 5.5V, IO UT = 1mA V EN = GND, Shutdown V EN = GND or VIN V IN = 3V to 5.5V, Shutdown V IN = 3V to 5.5V, Start-Up 10Hz to 100kHz, IOUT = 200mA CO UT = 1F ------1.2 --
220 --0.01 0 --100
VLOAD 1mA < IOUT < 300mA ISTBY IIBSD VIL Logic-Low Voltage
Logic-High Voltage VIH eNO
Output Noise Voltage
To be continued
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RT9193
Parameter Power Supply Rejection Rate f = 100Hz f = 10kHz Symbol PSRR TSD TSD Test Conditions C OUT = 1F, IOUT = 10mA Min ----Typ -70 -50 165 30 Max ----Units dB C C
Thermal Shutdown Temperature Thermal Shutdown Temperature
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. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board (Single Layer, 1S) of JEDEC 51-3 thermal measurement standard. Note 5. The dropout voltage is defined as VIN - VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
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RT9193
Typical Operating Characteristics
Output Voltage vs. Temperature
1.8 1.7
Quiescent Current vs. Temperature
95 90
Quiescent Current (uA)
50 75 100 125
RT9193-15xU5 VIN = 3.3V CIN = COUT = 1uF X7R
RT9193-15xU5 VIN = 3.3V CIN = COUT = 1uF X7R
Output Voltage (V)
1.6 1.5 1.4 1.3 1.2 -50 -25 0 25
85 80 75 70 65 60 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Dropout Voltage vs. Load Current
300 250 200
RT9193-33xB CIN = COUT = 1uF TJ = 125C
20
PSRR
VIN = 4V to 5V CIN = COUT = 1uF, X7R
Dropout Voltage (mV)
0
PSRR (dB)
TJ = 25C
150 100 50 0 0 0.05 0.1 0.15 0.2 0.25 0.3
-20
TJ = -40C
-40
-60
ILoad = 100mA ILoad = 10mA
-80
10 0.01
100 0.1
1K 1
10K 10
100K 100
1M 1000
Load Current (A)
Frequency (kHz) (Hz)
EN Pin Shoutdown Threshold vs. Temperature
1.75
EN Pin Shutdown Response
EN Pin Voltage (V)
10 5 0 VIN = 5V CIN = COUT = 1uF RT9193-28xU5 No Load
EN Pin Shoutdown Threshold (V)
1.5
RT9193-15xU5 VIN = 3.3V CIN = COUT = 1uF X7R
1.25
1
Output Voltage (V)
-50 -25 0 25 50 75 100 125
2 1 0
0.75
0.5
Time (500s/Div)
Temperature (C)
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RT9193
Load Transient Response
Load Current (mA) Load Current (mA)
VIN = 5V, VOUT = 2.8V 100 CIN = COUT = 1uF 50 0 ILoad = 1mA to 60mA
Load Transient Response
VIN = 5V, VOUT = 2.8V 400 CIN = COUT = 1uF 200 0 ILoad = 1mA to 250mA
Output Voltage Deviation (mV)
20 0 -20
Output Voltage Deviation (mV)
50 0 -50
Time (500s/Div)
Time (500s/Div)
Line Transient Response
Input Voltage Deviation (V)
6 5 4
Line Transient Response
Input Voltage Deviation (V)
6 5 4 VIN = 4V to 5V COUT = 1uF RT9193-25xB ILoad = 100mA
VIN = 4V to 5V COUT = 1uF
RT9193-25xB ILoad = 1mA
Output Voltage Deviation (mV)
10 0 -10
Output Voltage Deviation (mV)
10 0 -10
Time (50s/Div)
Time (100s/Div)
Noise
VIN = 4.5V CIN = COUT = 1uF, X7R 200 RT9193-30xB ILoad = 50mA 200
Noise
VIN = 4.5V CIN = COUT = 1uF, X7R RT9193-15xU5 ILoad = 50mA
Noise (V)
0 -100 -200
Noise (V)
f = 10Hz to 100kHz
100
100 0 -100 -200
f = 10Hz to 100kHz
Time (10ms/Div)
Time (10ms/Div)
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RT9193
Start Up
EN Pin Voltage (V)
10 5 0 VIN = 5V CIN = COUT = 1uF RT9193-28xU5 No Load
Output Voltage (V)
2 1 0
Time (10s/Div)
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RT9193
Applications Information
Like any low-dropout regulator, the external capacitors used with the RT9193 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9193 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 RT9193 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 1F with ESR is > 25m on the RT9193 output ensures stability. The RT9193 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 not more than 0.5 inch from the VOUT pin of the RT9193 and returned to a clean analog ground. Bypass Capacitor and Low Noise Connecting a 22nF between the BP pin and GND pin significantly reduces noise on the regulator output, it is critical that the capacitor connection between the BP pin and GND pin be direct and PCB traces should be as short as possible. There is a relationship between the bypass capacitor value and the LDO regulator turn on time. DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. Enable Function The RT9193 features an LDO regulator enable/disable function. To assure the LDO regulator will switch on, the EN turn on control level must be greater than 1.2 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.4 volts. For to protecting the system, the RT9193 have a quick-discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Thermal Considerations Thermal protection limits power dissipation in RT9193. When the operation junction temperature exceeds 165C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 30C. For continue operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is : PD = (VIN-VOUT) x IOUT + VIN x IQ 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 :
RT9193-15xU5 CIN = COUT = 1uF, X7R
150 200 250 300
Region of Stable COUT ESR vs. Load Current
100.00 100
Instable
10.00 10
C OUT ESR ()
1 1.00 Stable
0.10
0.01
PD(MAX) = ( TJ(MAX) - TA ) /JA Where T J(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance.
Simulation Verify
0.00 0 50 100
Load Current (mA)
Figure 1
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RT9193
For recommended operating conditions specification of RT9193, where T J(MAX) is the maximum junction temperature of the die (125C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (JA is layout dependent) for TSOT-23-5/ SOT-23-5 package is 250C/W, SC-70-5 package is 333C/ W, WDFN-6L 2x2 package is 165C/W and MSOP-8 package is 160C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = (125C-25C) / 333 = 300mW for SC-70-5 PD(MAX) = (125C-25C) / 250 = 400mW for TSOT-23-5/ SOT-23-5 PD(MAX) = (125C-25C) / 165 = 606mW for WDFN-6L 2x2 PD(MAX) = (125C-25C) / 160 = 625mW for MSOP-8 The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT9193 packages, the Figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
700 600
MSOP-8
WDFN-6L 2x2
Power Dissipation (mW)
500 400 300 200 100 0 0
TSOT-23-5/ SOT-23-5 SC 70-5
25
50
75
100
125
Ambient Temperature (C)
Figure 2. Derating Curve for Packages
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RT9193
Outline Dimension
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 0.650 0.080 0.210 0.260 0.460 Max 1.100 0.100 1.350 0.400 2.450 2.250
Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.026 0.003 0.008 0.010 0.018 Max 0.044 0.004 0.054 0.016 0.096 0.089
SC-70-5 Surface Mount Package
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RT9193
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.700 0.000 1.397 0.300 2.591 2.692 0.838 0.080 0.300 Max 1.000 0.100 1.803 0.559 3.000 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.028 0.000 0.055 0.012 0.102 0.106 0.033 0.003 0.012 Max 0.039 0.004 0.071 0.022 0.118 0.122 0.041 0.010 0.024
TSOT-23-5 Surface Mount Package
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RT9193
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-5 Surface Mount Package
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RT9193
D
D2 L
E
E2 SEE DETAIL A
1 e A A1 A3
b
2
1
2
1
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.
Symbol A A1 A3 b D D2 E E2 e L
Dimensions In Millimeters Min 0.700 0.000 0.175 0.200 1.950 1.000 1.950 0.500 0.650 0.300 0.400 Max 0.800 0.050 0.250 0.350 2.050 1.450 2.050 0.850
Dimensions In Inches Min 0.028 0.000 0.007 0.008 0.077 0.039 0.077 0.020 0.026 0.012 0.016 Max 0.031 0.002 0.010 0.014 0.081 0.057 0.081 0.033
W-Type 6L DFN 2x2 Package
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RT9193
D L
E
E1
e A A1 b A2
Symbol A A1 A2 b D e E E1 L
Dimensions In Millimeters Min 0.810 0.000 0.750 0.220 2.900 0.650 4.800 2.900 0.400 5.000 3.100 0.800 Max 1.100 0.150 0.950 0.380 3.100
Dimensions In Inches Min 0.032 0.000 0.030 0.009 0.114 0.026 0.189 0.114 0.016 0.197 0.122 0.031 Max 0.043 0.006 0.037 0.015 0.122
8-Lead MSOP Plastic Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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