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Preliminary
RT9017
500mA Peak, Thermal Folded Back CMOS LDO Regulator
General Description
The RT9017 is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9017 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 RT9017 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RT9017 consumes less than 0.01A in shutdown mode and has fast turn-on time less than 50s. RT9017 is short circuit thermal folded back protected. RT9017 lowers its OTP trip point from 165C to 110C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. 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 and WDFN-6L 2x2 packages, the RT9017 also offers a range of 1.5V to 3.5V with 0.1V per step.
Features
Short Circuit Thermal Folded Back Protection Low-Noise for RF Application Fast Response in Line/Load Transient Quick Start-Up (Typically 50s) 0.01A Standby Current When Shutdown Low Dropout : 380mV @ 500mA Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1F 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
RT9017Package Type V : SOT-23-3 B : SOT- 23-5 BR : SOT- 23-5 (R-Type) QW : WDFN-6L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 15 : 1.5V 16 : 1.6V : 34 : 3.4V 35 : 3.5V 1H : 1.85V 2H : 2.85V
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.
Pin Configurations
(TOP VIEW)
VIN 3
EN GND VIN
1 2 3 7 6 5 4
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. DS9017-03 August 2007
NC NC VOUT
1 GND
2 VOUT
WDFN-6L 2x2
SOT-23-3
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RT9017
EN NC GND 1 2 3 4 5 VIN
Preliminary
VIN GND
1 2 3
5
VOUT
VOUT
EN
4
NC
SOT-23-5
SOT-23-5 (R-Type)
Typical Application Circuit
RT9017 VIN CIN 1uF VIN VOUT COUT 1uF EN GND VOUT
Chip Enable
Functional Pin Description
Pin Name EN NC 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. No Internal Connection. Ground. Output Voltage. Input Voltage.
Function Block Diagram
EN Shutdown and Logic Control VREF +
Error Amplifier
VIN
MOS Driver VOUT Current-Limit and Thermal Protection GND
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Preliminary Absolute Maximum Ratings
(Note 1)
RT9017
6V 400mW 400mW 606mW 250C/W 250C/W 165C/W 150C 260C -65C to 150C 2kV 200V
Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-3 -------------------------------------------------------------------------------------------------------------------SOT-23-5 -------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-3, JA --------------------------------------------------------------------------------------------------------------SOT-23-5, JA --------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, 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)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range -------------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VIN = VOUT + 1V, CIN = COUT = 1F, TA = 25C, unless otherwise specified)
Parameter Output Voltage Accuracy Current Limit Quiescent Current Dropout Voltage (Note 5) Line Regulation Load Regulation Standby Current EN Input Bias Current EN Threshold Power Supply Rejection Rate Logic-Low Voltage
Symbol VOUT ILIM IQ VDROP VLINE
Test Conditions IOUT = 1mA RLOAD = 1 VEN >= 1.2V, IOUT = 0mA IOUT = 300mA, VOUT > 2.8V IOUT = 500mA, VOUT > 2.8V VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA
Min -2 530 --------1.2 ------
Typ --90 220 380 --0.01 0 ---60 -30 165 30 110
Max +2 -130 --0.3 0.6 1 100 0.4 -------
Units % mA A mV % % A nA V
VLOAD 1mA < IOUT < 500mA ISTBY IIBSD VIL VEN = GND, Shutdown VEN = GND or VIN VIN = 3V to 5.5V, Shutdown VIN = 3V to 5.5V, Start-Up COUT = 1F, IOUT = 100mA
Logic-High Voltage VIH f = 100Hz f = 10kHz PSRR TSD TSD
dB C C C
Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis Thermal Folded Back
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RT9017
Preliminary
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. JA is measured in the natural convection at TA = 25C on a low effective single layer thermal conductivity test board 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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Preliminary Typical Operating Characteristics
Output Voltage vs. Temperature
2
RT9017
Quiesent Current vs. Temperature
100 95
VIN = 5V CIN = COUT = 1uF
RT9017-15PB VIN = 3.3V CIN = COUT = 1uF
Quiescent Current (uA)
Output Voltage (V)
1.9
90 85 80 75 70 65
1.8
No Load
1.7
1.6 -50 -25 0 25 50 75 100 125
60 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
EN Pin Shutdown Threshold vs. Temperature
1.5
Dropout Voltage vs. Load Current
600 500
EN Pin Threshold Voltage (V)
Dropout Voltage (mV)
1.25
RT9017-15PB VIN = 3.3V CIN = COUT = 1uF
RT9017-33PB CIN = COUT = 1uF TJ = 125C
400 300 200 100 0
1
TJ = 25C
0.75
TJ = -40C
0.5
0.25 -50 -25 0 25 50 75 100 125
0
100
200
300
400
500
Temperature (C)
Load Current (mA)
20
PSRR
Input Voltage Deviation (V)
VOUT = 2.5V CIN = COUT = 1uF, X7R 5 4 3
Line Transient Response
CIN = COUT = 1uF ILOAD = 50mA
0
PSRR (dB)
-20
-40
Output Voltage Deviation (mV)
1K 1 10K 10 100K 100 1M 1000
20 0 -20
ILOAD = 100mA
-60
ILOAD = 10mA
-80
10 0.01
100 0.1
Time (100s/Div)
Frequency (kHz) (Hz)
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RT9017
Line Transient Response
Input Voltage Deviation (V)
5 4 3
Preliminary
Load Transient Response
Load Current (mA)
400 200 0 RT9017-35PB VIN = 5.0V CIN = COUT = 1uF ILOAD = 10mA to 300mA
CIN = COUT = 1uF
ILOAD = 250mA
Output Voltage Deviation (mV)
50 0 -50
Output Voltage Deviation (mV)
50 0 -50
Time (100s/Div)
Time (500s/Div)
Load Transient Response
EN Pin Voltage (V)
RT9017-35PB VIN = 5.0V CIN = COUT = 1uF ILOAD = 10mA to 400mA 10 5 0 VIN = 5V CIN = COUT = 1uF
Start Up
VOUT = 1.8V ILOAD = 1mA
Output Voltage Load Current Deviation (mV) (mA)
400 200 0
Output Voltage (V)
50 0 -50
2 1 0
Time (500s/Div)
Time (10s/Div)
EN Pin Shutdown Response
EN Pin Voltage (V)
10 5 VIN = 5V CIN = COUT = 1uF VOUT = 1.8V ILOAD = 1mA 400 VIN = 4.5V CIN = COUT = 1uF
Noise
VOUT = 1.8V ILOAD = 150mA
Noise (V)
0
200 0 -200 -400
Output Voltage (V)
2 1 0
f = 10Hz to 100kHz
Time (1ms/Div)
Time (5ms/Div)
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Preliminary
RT9017
Noise
VIN = 4.5V CIN = COUT = 1uF 400 VOUT = 1.8V No Load
Noise (V)
200 0 -200 -400 f = 10Hz to 100kHz
Time (5ms/Div)
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RT9017
Applications Information
Preliminary
Like any low-dropout regulator, the external capacitors used with the RT9017 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9017 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 RT9017 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 > 20m on the RT9017 output ensures stability. The RT9017 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 RT9017 and returned to a clean analog ground.
Enable Function The RT9017 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 RT9017 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 RT9017. When the operation junction temperature exceeds 165C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 30C. RT9017 lowers its OTP trip level from 165C to 110C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. This limits IC case temperature under 100C and provides maximum safety to end users when output short circuit occurs.
VOUT Short to GND
0.4V
Region of Stable COUT ESR vs. Load Current
100.00 100
VOUT
C OUT ESR () Region of Stable COUT ESR ()
Unstable Region 10 10.00
RT9017-15PB CIN = 1F, X7R
IOUT
1.00 1
COUT = 1uF
TSD 165 C 110 C OTP Trip Point 110 C IC Temperature 80 C
0.10
Stable Region
0.01
Unstable Region (Simulation Verity)
0.00 0 100 200 300 400 500
Load Current (mA)
Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs
Figure 1
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DS9017-03 August 2007
Preliminary
For continuous 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 : 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. For recommended operating conditions specification of RT9017, 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 SOT-23-3/SOT23-5 package is 250C/W and WDFN-6L 2x2 package is 165C/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)/250 = 400 mW (SOT-23-3/ SOT-23-5) PD(MAX) = (125C-25C)/333 = 300 mW (SC-70-5) The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT9017 packages, the Figure 3. of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
700
RT9017
WDFN-6L 2x2
Power Dissipation (mW)
600 500 400 300 200 100 0 0 25 50 75 100 125 150
SOT-23-3/ SOT-23-5
Ambient Temperature (C)
Figure 3. Derating Curve for Packages
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RT9017
Outline Dimension
Preliminary
D
H L
C
B
e
A A1 b
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 1.803 0.080 0.300 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.071 0.003 0.012 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024
SOT-23-3 Surface Mount Package
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Preliminary
RT9017
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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RT9017
Preliminary
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
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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DS9017-03 August 2007

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