RT9017 Preliminary 500mA Peak, Thermal Folded Back CMOS LDO Regulator General Description Features 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 0.01μA in shutdown mode and has fast turn-on time less than 50μs. RT9017 is short circuit thermal folded back protected. RT9017 lowers its OTP trip point from 165°C to 110°C when output short z Short Circuit Thermal Folded Back Protection z 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. z Low-Noise for RF Application Fast Response in Line/Load Transient Quick Start-Up (Typically 50μ μs) 0.01μ μA 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 1μ μF Output Capacitor Required for Stability High Power Supply Rejection Ratio Custom Voltage Available RoHS Compliant and 100% Lead (Pb)-Free 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 Note : Richtek Pb-free and Green products are : `RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. z z z z z z z z z z z z Applications z z z z z z CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances 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 6 2 5 3 7 4 NC NC VOUT WDFN-6L 2x2 1 2 GND VOUT SOT-23-3 `Suitable for use in SnPb or Pb-free soldering processes. `100% matte tin (Sn) plating. DS9017-03 August 2007 www.richtek.com 1 RT9017 Preliminary EN 1 NC 2 GND 3 5 VIN VOUT 4 VIN 1 GND 2 EN 3 SOT-23-5 5 VOUT 4 NC SOT-23-5 (R-Type) Typical Application Circuit RT9017 VIN VIN CIN 1uF VOUT COUT 1uF Chip Enable EN VOUT GND Functional Pin Description Pin Name EN 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. NC No Internal Connection. GND Ground. VOUT Output Voltage. VIN Input Voltage. Function Block Diagram EN Shutdown and Logic Control VIN VREF - MOS Driver + Error Amplifier VOUT Current-Limit and Thermal Protection GND www.richtek.com 2 DS9017-03 August 2007 RT9017 Preliminary Absolute Maximum Ratings (Note 1) Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOT-23-3 -------------------------------------------------------------------------------------------------------------------SOT-23-5 -------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------z Package Thermal Resistance (Note 4) SOT-23-3, θJA --------------------------------------------------------------------------------------------------------------SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------------z Junction Temperature ----------------------------------------------------------------------------------------------------z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------z Storage Temperature Range -------------------------------------------------------------------------------------------z ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) -----------------------------------------------------------------------------------------------------z 6V z Recommended Operating Conditions z z z 400mW 400mW 606mW 250°C/W 250°C/W 165°C/W 150°C 260°C −65°C to 150°C 2kV 200V (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = VOUT + 1V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units Output Voltage Accuracy ΔVOUT IOUT = 1mA −2 -- +2 % Current Limit ILIM RLOAD = 1Ω 530 -- -- mA Quiescent Current IQ -- 90 130 μA Dropout Voltage (Note 5) VDROP VEN >= 1.2V, IOUT = 0mA IOUT = 300mA, VOUT > 2.8V -- 220 -- IOUT = 500mA, VOUT > 2.8V -- 380 -- Line Regulation ΔVLINE VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA -- -- 0.3 % Load Regulation ΔVLOAD 1mA < IOUT < 500mA -- -- 0.6 % Standby Current ISTBY VEN = GND, Shutdown -- 0.01 1 μA EN Input Bias Current IIBSD VEN = GND or VIN -- 0 100 nA VIL VIN = 3V to 5.5V, Shutdown -- -- 0.4 1.2 -- -- -- −60 -- -- −30 -- EN Threshold Power Supply Rejection Rate Logic-Low Voltage Logic-High Voltage VIH f = 100Hz f = 10kHz PSRR VIN = 3V to 5.5V, Start-Up COUT = 1μF, IOUT = 100mA mV V dB Thermal Shutdown Temperature TSD -- 165 -- °C Thermal Shutdown Temperature Hysteresis ΔTSD -- 30 -- °C -- 110 -- °C Thermal Folded Back DS9017-03 August 2007 www.richtek.com 3 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. θJA is measured in the natural convection at TA = 25°C 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. www.richtek.com 4 DS9017-03 August 2007 RT9017 Preliminary Typical Operating Characteristics Quiesent Current vs. Temperature Output Voltage vs. Temperature 100 VIN = 5V CIN = COUT = 1uF RT9017-15PB 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 RT9017-15PB VIN = 3.3V CIN = COUT = 1uF 100 125 RT9017-33PB CIN = COUT = 1uF 0.75 0.5 TJ = 125°C 400 TJ = 25°C 300 200 TJ = -40°C 100 0.25 0 -50 -25 0 25 50 75 100 125 0 100 200 300 400 Temperature (°C) Load Current (mA) PSRR Line Transient Response Input Voltage Deviation (V) VOUT = 2.5V CIN = COUT = 1uF, X7R 0 -20 Output Voltage Deviation (mV) PSRR (dB) 75 500 Dropout Voltage (mV) EN Pin Threshold Voltage (V) 600 1 20 50 Dropout Voltage vs. Load Current EN Pin Shutdown Threshold vs. Temperature 1.25 25 Temperature (°C) Temperature (°C) 1.5 0 -40 ILOAD = 100mA -60 ILOAD = 10mA CIN = COUT = 1uF 500 ILOAD = 50mA 5 4 3 20 0 -20 -80 10 0.01 100 0.1 1K 1 10K 10 100K 100 1M 1000 Time (100μs/Div) Frequency (kHz) (Hz) DS9017-03 August 2007 www.richtek.com 5 RT9017 Preliminary 4 50 0 -50 CIN = COUT = 1uF ILOAD = 10mA to 300mA RT9017-35PB VIN = 5.0V 200 0 50 0 -50 Time (100μs/Div) Time (500μs/Div) Load Transient Response Start Up CIN = COUT = 1uF ILOAD = 10mA to 400mA 400 200 10 VOUT = 1.8V ILOAD = 1mA VIN = 5V CIN = COUT = 1uF 5 0 Output Voltage (V) 0 50 0 -50 10 2 1 0 Time (500μs/Div) Time (10μs/Div) EN Pin Shutdown Response Noise VIN = 5V CIN = COUT = 1uF 5 400 0 200 2 VOUT = 1.8V ILOAD = 150mA VIN = 4.5V CIN = COUT = 1uF VOUT = 1.8V ILOAD = 1mA Noise (μV) Output Voltage Load Current Deviation (mV) (mA) EN Pin Voltage (V) 400 Output Voltage Deviation (mV) 3 RT9017-35PB VIN = 5.0V Output Voltage (V) ILOAD = 250mA Load Current (mA) CIN = COUT = 1uF 5 Load Transient Response EN Pin Voltage (V) Output Voltage Deviation (mV) Input Voltage Deviation (V) Line Transient Response 0 -200 -400 1 0 f = 10Hz to 100kHz Time (1ms/Div) www.richtek.com 6 Time (5ms/Div) DS9017-03 August 2007 Preliminary RT9017 Noise VOUT = 1.8V No Load VIN = 4.5V CIN = COUT = 1uF Noise (μV) 400 200 0 -200 -400 f = 10Hz to 100kHz Time (5ms/Div) DS9017-03 August 2007 www.richtek.com 7 RT9017 Preliminary Applications Information 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 > 1μF 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. Enable Function 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 1μF with ESR is > 20mΩ 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. Thermal Considerations 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 protection limits power dissipation in RT9017. When the operation junction temperature exceeds 165°C, 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 30°C. RT9017 lowers its OTP trip level from 165°C to 110°C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. This limits IC case temperature under 100°C 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 (Ω)ESR (Ω) OUT ESR Region ofCStable COUT 100.00 100 RT9017-15PB CIN = 1μF, X7R Unstable Region 10 10.00 COUT = 1uF 1.001 IOUT TSD 165 °C 110 °C OTP Trip Point 110 °C Stable Region 0.10 VOUT 0.01 IC Temperature Unstable Region (Simulation Verity) 80 °C 0.00 0 100 200 300 Load Current (mA) 400 500 Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs Figure 1 www.richtek.com 8 DS9017-03 August 2007 RT9017 Preliminary 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 ) / θJA Where T J(MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. 700 WDFN-6L 2x2 Power Dissipation (mW) For continuous operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : 600 500 SOT-23-3/ SOT-23-5 400 300 200 100 0 0 25 50 75 100 125 150 Ambient Temperature (°C) Figure 3. Derating Curve for Packages For recommended operating conditions specification of RT9017, 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 SOT-23-3/SOT23-5 package is 250°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 = 400 mW (SOT-23-3/ SOT-23-5) PD(MAX) = (125°C−25°C)/333 = 300 mW (SC-70-5) The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. 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. DS9017-03 August 2007 www.richtek.com 9 RT9017 Preliminary Outline Dimension H D L C B e A A1 b Symbol Dimensions In Millimeters Dimensions In Inches 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 www.richtek.com 10 DS9017-03 August 2007 RT9017 Preliminary H D L B C b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches 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 DS9017-03 August 2007 www.richtek.com 11 RT9017 Preliminary 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. Symbol Dimensions In Millimeters Dimensions In Inches 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 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek.com 12 DS9017-03 August 2007