® RT9053A Low Dropout, 400mA Adjustable Linear Regulator General Description Features The RT9053A is a high performance, 400mA LDO regulator and ultra low dropout. The quiescent current is as low as 42μA, further prolonging the battery life. The RT9053A also works with low ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Ordering Information RT9053A Package Type B : SOT-23-5 QW : WDFN-6L 2x2 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) (for WDFN-6L 2x2 Only) Note : Wide Operating Voltage Ranges : 2.2V to 5.5V Low Dropout : 230mV at 400mA Ultra Fast Response in Line/Load Transient Current Limiting Protection Thermal Shutdown Protection Output Only 1μ μF Capacitor Required for Stability RoHS Compliant and Halogen Free Applications Mega Sim Card CDMA/GSM Cellular Handsets Portable Information Appliances Laptop, Palmtops, Notebook Computers Hand-Held Instruments Mini PCI& PCI-Express Cards PCMCIA & New Cards Pin Configurations (TOP VIEW) VOUT FB 5 4 Richtek roducts are : ments of IPC/JEDEC J-STD-020. 2 RoHS compliant and compatible with the current requireSuitable for use in SnPb or Pb-free soldering processes. 3 EN 1 GND VIN 2 GND The RT9053A consumes typically 0.7μA in shutdown mode. The other features include low dropout voltage, high output accuracy, and current limiting protection. The RT9053A is available in SOT-23-5 and WDFN-6L 2x2 packages. Adjustable Output Voltage Down to 0.8V 3 7 6 FB 5 NC VOUT 4 VIN GND EN SOT-23-5 WDFN-6L 2x2 Marking Information RT9053AGB RT9053AGQW 3Q= : Product Code 3Q=DNN DNN : Date Code JH : Product Code JHW W : Date Code RT9053AZQW J_H : Product Code J_HW Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS9053A-03 September 2014 W : Date Code is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9053A Typical Application Circuit RT9053A VIN VIN CIN 1µF VOUT COUT 1µF VOUT R1 Chip Enable EN FB R2 GND Functional Pin Description Pin No. SOT-23-5 WDFN-6L 2x2 1 Pin Name Pin Function 3 2, 7 (Exposed Pad) VIN 3 1 EN 4 6 FB Supply Input. Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Chip Enable (Active High). When the EN goes to a logic low, the device will be shutdown mode. Output Voltage Feedback. 5 -- 4 5 VOUT NC Regulator Output. No Internal Connection. 2 GND Function Block Diagram EN POR OTP Current Limit VREF FB VIN + MOS Driver VOUT GND Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. RT9053A-03 September 2014 RT9053A Absolute Maximum Ratings (Note 1) Supply Input Voltage, VIN -----------------------------------------------------------------------------------------------EN Input Voltage ---------------------------------------------------------------------------------------------------------- Power Dissipation, PD @ TA = 25°C (Note 2) SOT-23-5 -------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 ------------------------------------------------------------------------------------------------------------- Package Thermal Resistance SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJC -------------------------------------------------------------------------------------------------------- Lead Temperature (Soldering 10sec.) ------------------------------------------------------------------------------- Junction Temperature ---------------------------------------------------------------------------------------------------- Storage Temperature Range ------------------------------------------------------------------------------------------- ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------------MM (Machine Model) ---------------------------------------------------------------------------------------------------- Recommended Operating Conditions 6V 6V 0.4W 0.606W 250°C/W 165°C/W 8.2°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 4) Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 2.2V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = 3.7V, CIN = COUT = 1μF, IOUT = 20mA, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 0.792 0.8 0.808 V FB Reference Voltage VFB Output Voltage Accuracy VOUT IOUT = 10mA 1 0 1 % Quiescent Current IQ IOUT = 0mA -- 35 50 A Shutdown Current ISHDN -- 0.7 1.5 A Current Limit ILIM 400 650 1000 mA Dropout Voltage VDROP VEN = 0V RLOAD = 0, 2.2V VIN < 5.5V IOUT = 400mA -- 230 350 mV Load Regulation VLOAD 1mA < IOUT < 400mA 2.2V VIN < 5.5V -- -- 1 % Line Regulation VLINE VIN = (VOUT + 0.5) to 5.5V, IOUT = 1mA -- 0. 01 0.2 %/V Logic-High VIH 1.6 -- 5.5 Logic-Low VIL 0 -- 0.6 Enable Pin Current IEN -- 1 2 A FB Pin Current IFB -- 0.1 1 A Thermal Shutdown Temperature TSD -- 150 -- °C EN Threshold Voltage Copyright © 2014 Richtek Technology Corporation. All rights reserved. RT9053A-03 September 2014 V is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9053A Parameter Symbol Power Supply Rejection Rate PSRR Output Noise Voltage VON Test Conditions Min Typ Max f = 1kHz, I OUT = 10mA -- 56 -- f = 10kHz, I OUT = 10mA -- 35 -- VOUT = 1.5V, COUT = 1F, I OUT = 0mA -- 30 -- Unit dB VRMS Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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 may affect device reliability. Note 2. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3. θJC is measured at the exposed pad of 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. Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. RT9053A-03 September 2014 RT9053A Typical Operating Characteristics Reference Voltage vs. Temperature Quiescent Current vs. Temperature 60 0.815 56 Quiescent Current (µA) Reference Voltage (V) 0.810 0.805 0.800 0.795 0.790 0.785 52 48 44 40 36 32 28 24 VIN = VEN = 3.3V, No Load 0.780 VIN = VEN = 3.3V, No Load 20 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 75 100 125 EN Threshold Voltage vs. Temperature Dropout Voltage vs. Load Current 1.5 TA = 125°C TA = 25°C 0.30 0.25 0.20 TA = −40°C 0.15 0.10 0.05 EN Threshold Voltage (V) 1.4 0.35 Dropout Voltage (V) 50 Temperature (°C) 0.40 1.3 1.2 1.1 1.0 Rising 0.9 Falling 0.8 0.7 0.6 VEN = 3.3V, VOUT = 2.5V 0.00 VIN = 3.3V, No Load 0.5 0 50 100 150 200 250 300 350 400 -50 -25 0 25 50 75 100 125 Temperature (°C) Load Current (mA) Current Limit vs. Input Voltage Current Limit vs. Temperature 0.90 0.90 0.85 0.85 0.80 0.80 Current Limit (A) Current Limit (A) 25 0.75 0.70 0.65 0.75 0.70 0.65 0.60 0.60 0.55 0.55 VIN = 3.3V, VOUT = 1.8V VOUT = 1.8V 0.50 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Input Voltage (V) Copyright © 2014 Richtek Technology Corporation. All rights reserved. RT9053A-03 September 2014 5.5 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9053A Load Transient Response PSRR vs. Frequency 0 -10 VOUT (5mV/Div) PSRR (dB) -20 -30 -40 -50 IOUT (200mA/Div) -60 -70 VIN = 3.3V, VOUT = 2.5V, ILOAD = 200mA to 400mA, CIN = COUT = 1μF / X7R VIN = 3.3V, VOUT = 2.5V ILOAD = 10mA, CIN = COUT = 1μF/X7R -80 10 100 1k 1000 10k 10000 100k 100000 1000000 1M Time (100μs/Div) Frequency (Hz) Enable/Shutdown Response Power On from EN VEN (2V/Div) VEN (5V/Div) VOUT (500mV/Div) VOUT (1V/Div) VIN = 5V, VOUT = 2.5V, No Load Time (5μs/Div) Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 VIN = 5V, VOUT = 2.5V, ILOAD = 15mA Time (500μs/Div) is a registered trademark of Richtek Technology Corporation. RT9053A-03 September 2014 RT9053A Application Information Input Capacitor Selection Enable Function Like any low dropout linear regulator, the external capacitors used with the RT9053A must be carefully selected for stability and performance. The input capacitance is recommended to be at least 1μF, and can be increased without limit. The input capacitor must be located at a distance of less than 0.5 inch from the input pin of the IC and returned to a clean ground plane. Any high-quality ceramic capacitor or tantalum capacitor can be used for the input capacitor. Using input capacitor with larger capacitance and lower ESR (Equivalent Series Resistance) can obtain better PSRR and line transient response. The RT9053A features enable/shutdown function. The voltage at the EN pin determines the enable/shutdown state of the regulator. To ensure the regulator will switch on, the enable control voltage must be greater than 1.6V. The regulator will enter shutdown mode when the voltage at the EN pin falls below 0.6V. If the enable function is not needed, the EN pin should be pulled high or simply tied to VIN to keep the regulator in an on state. Output Capacitor Selection The RT9053A is designed specifically to work with low ESR ceramic output capacitor to save board space and have better performance. The output capacitor is recommended to be at least 1μF. Larger capacitance can reduce noise and improve load transient response, stability and PSRR. The RT9053A can operate with other types of output capacitor due to its wide stable operation range. The output capacitor should be placed less than 0.5 inch from the VOUT pin and returned to a clean ground plane. Output Voltage Setting The output voltage divider R1 and R2 allows adjustment of the output voltage for various application as shown in Figure 1. PSRR RT9053A features high Power Supply Rejection Ratio (PSRR), which is defined as the ratio of output voltage change against input voltage change. VOUT PSRR 20 log V IN A low dropout regulator with a higher PSRR can provide better line transient performance. Current Limit The RT9053A implements an independent current limit circuit, which monitors and controls the pass element’s gate voltage to limit the output current at 650mA (typ.). If the current limit condition lasts for a long time, the regulator temperature may increase high enough to damage the regulator itself. Therefore, the RT9053A implements current limit function and thermal protection function to prevent the regulator from damage when the output is shorted to ground. VOUT R1 FB RT9053A R2 GND Figure 1. Output Voltage Setting The output voltage is set according to the following equation : R1 VOUT VFB 1 R2 where VFB is the feedback reference voltage (0.8V typical). Copyright © 2014 Richtek Technology Corporation. All rights reserved. RT9053A-03 September 2014 Thermal Considerations For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : PD(MAX) = (TJ(MAX) − TA ) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9053A PD(MAX) = (125°C − 25°C) / (250°C/W) = 0.400W for SOT-23-5 package The thermal resistance θJA is determined by the package architecture design and the PCB layout design. However, the package architecture design had been already designed. If possible, it's useful to increase thermal performance by the PCB layout copper design. The thermal resistance θJA can be decreased by adding copper area under the exposed pad of WDFN series package. As shown in Figure 2, we can find the relation between the copper area and the thermal resistance θJA. The thermal resistance will be reduced by adding more copper area. When IC mounted to the standard footprint, the thermal resistance θJA is 165°C/W. Adding copper area of pad to 15mm2 under the package reduces the θJA to 150°C/W. Even further, increasing the copper area of pad to 70mm2 reduces the θJA to 130°C/W. Thermal Resistance (°C/W) 180 160 140 120 100 80 60 Maximum Power Dissipation (W)1 PD(MAX) = (125°C − 25°C) / (165°C/W) = 0.606W for WDFN-6L 2X2 package As shown in Figure 3, we can also find the WDFN-6L 2x2 maximum power dissipation improvement by different copper area design at ambient temperature TA = 25°C operation. 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 10 30 40 50 60 70 Copper Area (mm ) Figure 3. Maximum Power Dissipation PD vs. PCB Copper Area The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. For the RT9053A packages, the derating curves in Figure 4 allow the designer to see the effect of rising ambient temperature on the maximum power dissipation. 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 Copper Area WDFN 2x2 70mm2 WDFN 2x2 15mm2 WDFN 2x2, Min. Layout SOT-23-5, Min Layout Single-Layer PCB 0 40 20 2 Maximum Power Dissipation (W)1 For recommended operating condition specifications of the RT9053A, the maximum junction temperature is 125°C and TA is the ambient temperature. The junction to ambient thermal resistance, θJA, is layout dependent. For WDFN6L 2x2 packages, the thermal resistance, θJA, is 165°C/ W on a standard JEDEC 51-3 single-layer thermal test board. For SOT-23-5 packages, the thermal resistance, θJA, is 250°C/W on a standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formulas : 25 50 75 100 125 Ambient Temperature (°C) 20 Figure 4. Derating Curves for RT9053A Packages 0 0 10 20 30 40 50 60 70 2 Copper Area (mm ) Figure 2. WDFN-6L 2x2 Thermal Resistance θJA vs. PCB Copper Area Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. RT9053A-03 September 2014 RT9053A Outline Dimension 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 Copyright © 2014 Richtek Technology Corporation. All rights reserved. RT9053A-03 September 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9053A 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 14F, No. 8, Tai Yuen 1st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. www.richtek.com 10 RT9053A-03 September 2014