® RT9030A 300mA, Low Input Voltage, Low Dropout, Low Noise UltraFast Without Bypass Capacitor CMOS LDO Regulator General Description Features The RT9030A is a high-performance, 300mA LDO regulator, offering extremely high PSRR and ultra-low dropout. Ideal for portable RF and wireless applications with demanding performance and space requirements. The RT9030A quiescent current as low as 25μA further prolongs the battery life. The RT9030A also works with low ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. The RT9030A consumes typical 0.7μA in shutdown mode and has fast turn-on time less than 40μs. The other features include ultra-low dropout voltage, high output accuracy, current limiting protection and high ripple rejection ratio. Ordering Information RT9030A Package Type B : SOT-23-5 Lead Plating System G : Green (Halogen Free and Pb Free) Fixed Output Voltage 10 : 1.0V 11 : 1.1V : 32 : 3.2V 33 : 3.3V 1B : 1.25V 1H : 1.85V 2H : 2.85V 1K : 1.05V Wide Operating Voltage Range : 1.5V to 5.5V Output Voltage Range : 1V to 3.3V Low Dropout : 300mV at 300mA Ultra-Low-Noise for RF Application Ultra-Fast Response in Line/Load Transient Current Limiting Protection Thermal Shutdown Protection High Power Supply Rejection Ratio Only 1μ μF Output Capacitor Required for Stability TTL-Logic-Controlled Shutdown Input RoHS Compliant and Halogen Free Applications 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 NC 5 4 2 3 VIN GND EN SOT-23-5 Note : Richtek 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. Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9030A-02 December 2013 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9030A Typical Application Circuit 1 VIN VIN CIN 1µF/X7R Chip Enable 3 VOUT 5 RT9030A NC EN VOUT COUT 1µF/X7R 4 GND 2 Functional Pin Description Pin No. Pin Name Pin Function 1 VIN Supply Input. 2 GND Ground. 3 EN Enable Input Logic, Active High. When the EN pin is open, it will be pulled low internally. 4 NC No Internal Connection. 5 VOUT Regulator Output. Function Block Diagram EN POR OTP 1µA Current Limit VREF + VIN MOS Driver VOUT GND Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9030A-02 December 2013 RT9030A Absolute Maximum Ratings (Note 1) Supply Input Voltage -----------------------------------------------------------------------------------------------------EN Input Voltage ----------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOT-23-5 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------------MM (Machine Model) ----------------------------------------------------------------------------------------------------- Recommended Operating Conditions 6V 6V 0.400W 250°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 4) Input Voltage Range ------------------------------------------------------------------------------------------------------ 1.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = VOUT + 0.5V, VEN = VIN, CIN = COUT = 1μF/X5R (Ceramic), TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Typ Max Unit -- 30 -- VRMS 2 0 2 % Output Noise Voltage VON Output Voltage Accuracy (Fixed Output Voltage) VOUT Quiescent Current IQ IOUT = 0mA -- 25 50 A Shutdown Current ISHDN VEN = 0V -- 0.7 1.5 A Current Limit ILIM RLOAD = 0, 1.5V VIN < 5.5V 350 600 -- mA 50 400 550 40 250 400 20 150 300 -- -- 1 Dropout Voltage (Note 5) (Note 6) Load Regulation (Note 7) (Fixed Output Voltage) EN Threshold Voltage VDROP VLOAD IOUT = 0mA Min VOUT = 1.2V to 1.4V, IOUT = 300mA VOUT = 1.5V to 2.4V, IOUT = 300mA VOUT = 2.5V to 3.3V, IOUT = 300mA VIN = (VOUT + 0.6V) to 5.5V, IOUT = 1mA to 300mA Logic-High VIH 1.6 -- 5.5 Logic-Low VIL 0 -- 0.3 IEN -- 1 3 -- 67 -- -- 55 -- -- 40 -- EN Pin Current f = 1kHz Power Supply Rejection Rate f = 10kHz PSRR f = 100kHz Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9030A-02 December 2013 mV % V A dB is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9030A Parameter Line Regulation Symbol VLINE Test Conditions VIN = (VOUT + 0.6V) to 5.5V, IOUT = 1mA to 300mA Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis TSD Min Typ Max Unit -- 0.01 0.2 %/V -- 150 -- -- 20 -- C 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. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 6. The dropout voltage is defined as VIN − VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS9030A-02 December 2013 RT9030A Typical Operating Characteristics Output Voltage vs. Temperature Quiescent Current vs. Temperature 1.80 31 VIN = 4.2V 29 Quiescent Current (µA) Output Voltage (V) 1.75 1.70 1.65 1.60 1.55 27 25 23 VIN = 3.3V 21 19 VIN = 1.65V 17 VIN = 3.3V, VOUT = 1.7V 1.50 15 -50 -25 0 25 50 75 100 125 -50 -25 Temperature (°C) 0 25 50 75 Dropout Voltage vs. Load Current 125 Dropout Voltage vs. Load Current 0.12 0.45 0.40 0.10 125°C 25°C 0.08 0.06 −40°C 0.04 Dropout Voltage (V) Dropout Voltage (V) 100 Temperature (°C) 125°C 0.35 25°C 0.30 0.25 −40°C 0.20 0.15 0.10 0.02 0.05 VOUT = 3.3V 0.00 VOUT = 1.5V 0.00 0 25 50 75 100 125 150 0 100 150 200 Load Current (mA) Power On from EN Power Off from EN VEN (5V/Div) VEN (5V/Div) VOUT (500mV/Div) VOUT (500mV/Div) Time (10μs/Div) Copyright © 2013 Richtek Technology Corporation. All rights reserved. December 2013 250 300 VOUT = 1.7V, VIN = 3.3V, ILOAD = 50mA VOUT = 1.7V, VIN = 3.3V, ILOAD = 50mA DS9030A-02 50 Load Current (mA) Time (50μs/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9030A Line Transient Response Line Transient Response VIN 4.5 (V) VIN 4.5 (V) VOUT (10mV/Div) VOUT (10mV/Div) 3.5 3.5 VOUT = 1.7V, VIN = 3.5V to 4.5V, ILOAD = 10mA VOUT = 1.7V, VIN = 3.5V to 4.5V, ILOAD = 100mA Time (100μs/Div) Time (100μs/Div) Load Transient Response Load Transient Response IOUT (50mA/Div) IOUT (50mA/Div) VOUT (50mV/Div) VOUT (50mV/Div) VOUT = 1.7V, VIN = 3V, ILOAD = 1mA to 50mA VOUT = 1.7V, VIN = 3V, ILOAD = 1mA to 120mA Time (100μs/Div) Time (100μs/Div) PSRR Noise 0 VOUT = 1.7V, VIN = 3.3V ±50mV IOUT = 50mA -10 PSRR (dB) -20 VOUT (100μV/Div) IOUT = 10mA -30 -40 -50 -60 -70 VOUT = 1.7V, VIN = 4.5V (Battery), ILOAD = 50mA -80 Time (10ms/Div) 10 100 1000 10000 100000 1000000 Frequency (Hz) Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS9030A-02 December 2013 RT9030A Applications Information Capacitor Selection Thermal Considerations In order to confirm the regulator stability and performance, X7R/X5R or other better quality ceramic capacitor should be selected. 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 : The output capacitor must meet both requirements for minimum amount of capacitance in all LDOs application. The RT9030A 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 on the RT9030A output ensures stability. Output capacitor with larger capacitance can reduce noise and improve load transient response, stability and PSRR. The output capacitor should be located in less than 0.5 inch from the VOUT pin of the RT9030A and returned to a clean analog ground. Enable The RT9030A goes into shutdown mode when the EN pin is in a logic low condition. During this condition, the pass transistor, error amplifier and bandgap are turned off, reducing the supply current to 0.7μA typical. The EN pin can be directly tied to VIN to keep the part on. Current limit The RT9030A contains an independent current limiter, which monitors and limits the output current to 600mA (typ.) by controling the gate voltage of the pass transistor. The output can be shorted to ground indefinitely without damaging the part. 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. For recommended operating condition specifications, the maximum junction temperature is 125°C. The junction to ambient thermal resistance, θJA , is layout dependent. 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 formula : PD(MAX) = (125°C − 25°C) / (250°C/W) = 0.400W for SOT-23-5 package The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA . The derating curve in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. 0.45 Maximum Power Dissipation (W)1 Like any low-dropout regulator, the external capacitors used with the RT9030A must be carefully selected for regulator stability and performance. Use at least 1μF of capacitor on the RT9030A's input and the amount of capacitance can be increased without limit. The input capacitor should be located in less than 0.5 inch from the input pin of the IC and returned to a clean analog ground. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. Single Layer PCB 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curve of Maximum Power Dissipation Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9030A-02 December 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9030A Layout Considerations Careful PCB Layout is necessary for better performance. The following guidelines should be followed for good PCB layout. Place the input and output capacitors as close as possible to the IC. Keep VIN and VOUT trace as possible as short and wide. Use a large PCB ground plane for maximum thermal dissipation. CIN should be placed as close as possible to VIN pin for good filtering. VIN VIN 1 GND 2 EN 3 COUT should be placed as close as possible to VOUT pin for good filtering. VOUT 5 VOUT CIN COUT 4 NC GND The through hole of the GND pin is recommended to be as many as possible. Figure 2. PCB Layout Guide Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. DS9030A-02 December 2013 RT9030A Outline Dimension H D L B C b A A1 e Dimensions In Millimeters Dimensions In Inches Symbol 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 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. DS9030A-02 December 2013 www.richtek.com 9