RT9073-18GB

® RT9073 1μ μA IQ, 250mA Low-Dropout Linear Regulator General Description Features The RT9073 is a low-dropout (LDO) voltage regulators with enable function that operates from 1.2V to 5.5V. It provides up to 250mA of output current and offers low-power operation in miniaturized packaging.  The features of low quiescent current as low as 1μA and almost zero disable current is ideal for powering the battery equipment to a longer service life. The RT9073 is stable with the ceramic output capacitor over its wide input range from 1.2V to 5.5V and the entire range of output load current (0mA to 250mA).         Ordering Information  RT9073/N-  Package Type B : SOT-23-5 U5 : SC-70-5 Lead Plating System G : Green (Halogen Free and Pb Free) Output Voltage   Applications 09 : 0.9V  1K : 1.05V  12 : 1.2V  15 : 1.5V 18 : 1.8V 1μ μA Ground Current at no Load PSRR = 75dB at 1kHz Adjustable Output Voltage Available by Specific Application ±2% Output Accuracy 250mA (VIN ≥ 2.3V) Output Current with EN Low (0.1μ μA) Disable Current 1.2V to 5.5V Operating Input Voltage Dropout Voltage : 0.5V at 250mA when VOUT ≥ 3V Support Fixed Output Voltage 0.9V, 1.05V, 1.2V, 1.5V, 1.8V, 1.9V, 2.5V, 2.7V, 2.8V, 2.9V, 3V, 3.3V Stable with Ceramic or Tantalum Capacitor Current Limit Protection Over Temperature Protection SOT-23-5 and SC-70-5 Packages Available Portable, Battery Powered Equipment Ultra Low Power Microcontrollers Notebook computers 19 : 1.9V Marking Information 25 : 2.5V 27 : 2.7V 28 : 2.8V For marking information, contact our sales representative directly or through a Richtek distributor located in your area. 29 : 2.9V 30 : 3.0V 33 : 3.3V Special Request : Any Voltage Between 0.9V and 3.3V under specific business agreement Pin Function RT9073 : Without NC Pin RT9073N : With NC Pin 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 © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9073 Pin Configurations (TOP VIEW) VOUT SNS/NC 5 4 2 VOUT SNS/NC 5 4 2 3 3 VIN GND EN VIN GND EN SOT-23-5 SC-70-5 Functional Pin Description Pin No. Pin Name Pin Function SOT-23-5 SC-70-5 1 1 VIN Supply Voltage Input. 2 2 GND Ground. 3 3 EN Enable Control Input. 4 4 SNS Output Voltage Sense. NC No Internal Connection. (RT9073N only) 5 5 VOUT Output of the Regulator. Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Function Block Diagram VIN (without sense function) Current/Thermal Sense GND SNS (with sense function) Bandgap Reference + - EN VOUT R1 R2 Operation Basic operation Current Limit Protection The RT9073 is a low quiescent current linear regulator designed especially for low external components system. The input voltage range is from 1.2V to 5.5V. The RT9073 provides current limit function to prevent the device from damages during over-load or shorted-circuit condition. This current is detected by an internal sensing transistor. Output Transistor The RT9073 builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications. Error Amplifier The Error Amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the Gate voltage of P-MOSFET to support good line regulation and load regulation at output voltage. Over Temperature Protection The over temperature protection function will turn off the P-MOSFET when the junction temperature exceeds 150°C (typ.), VIN ≥ 1.5V and the output current exceeds 30mA. Once the junction temperature cools down by approximately 20°C, the regulator will automatically resume operation. Enable The RT9073 delivers the output power when it is set to enable state. When it works in disable state, there is no output power and the operation quiescent current is almost zero. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9073 Absolute Maximum Ratings         (Note 1) VIN, VOUT, SNS, EN to GND ------------------------------------------------------------------------------------------- −0.3V to 6.5V VOUT to VIN ---------------------------------------------------------------------------------------------------------------- −6.5V to 0.3V Power Dissipation, PD @ TA = 25°C SOT-23-5 -------------------------------------------------------------------------------------------------------------------- 0.45W SC-70-5 ---------------------------------------------------------------------------------------------------------------------- 0.29W Package Thermal Resistance (Note 2) SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------- 218.1°C/W SC-70-5, θJA ---------------------------------------------------------------------------------------------------------------- 342.3°C/W Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV MM (Machine Model) ------------------------------------------------------------------------------------------------------ 200V Recommended Operating Conditions    (Note 4) Input Voltage, VIN --------------------------------------------------------------------------------------------------------- 1.2V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VOUT + 1 < VIN < 5.5V, TA = 25°C, unless otherwise specified) Parameter Output Voltage Range Symbol Dropout Voltage (ILOAD = 250mA) (Note 5) (Note 5) VCC Consumption Current Min Typ Max Unit 0.9 -- 3.3 V ILOAD = 1mA 2 -- 2 % 0.9V  VOUT  1.2V -- 0.5 0.65 1.2V  VOUT  1.5V -- 0.3 0.4 1.5V  VOUT  1.8V -- 0.2 0.24 1.8V  VOUT  2.5V -- 0.15 0.18 2.5V  VOUT  3V -- 0.1 0.15 3V  VOUT -- 0.08 0.12 0.9V  VOUT  1.2V -- 1.25 1.45 1.2V  VOUT  1.5V -- 1 1.2 1.5V  VOUT  1.8V -- 0.81 0.9 1.8V  VOUT  2.5V -- 0.68 0.8 2.5V  VOUT  3V -- 0.51 0.6 3V  VOUT -- 0.45 0.6 ILOAD = 0mA, VOUT ≦ 5.5V -- 1 3 VOUT DC Output Accuracy Dropout Voltage (ILOAD = 50mA) Test Conditions VDROP VDROP IQ Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 V V A is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Parameter Symbol Test Conditions Min Typ Max Unit Shutdown GND Current VEN = 0V -- 0.1 0.5 A Shutdown Leakage Current VEN = 0V, VOUT = 0V -- 0.1 0.5 A VEN = 5.5V -- -- 0.1 A 1.2V  VIN  1.5V -- -- 0.6 1.5V  VIN  1.8V -- -- 0.3 1.8V  VIN  2.1V -- -- 0.1 2.1V  VIN  5.5V -- -- 0.15 EN Input Current IEN LINE Line Regulation ILOAD = 10mA % Load Regulation LOAD 5mA < ILOAD < 250mA -- -- 1 % Power Supply Rejection Ratio PSRR VIN = 3V, ILOAD = 50mA, COUT = 1F, VOUT = 2.5V, f = 1kHz -- 75 -- dB VOUT = 0.9V -- 39 -- VOUT = 1.2V -- 46 -- VOUT = 1.8V -- 48 -- VOUT = 3.3V -- 58 -- Peak output current 260 350 500 mA VOUT = 0.5V x VOUT(normal) 150 270 390 mA COUT = 1F, ILOAD = 30mA, BW = 10Hz to 100kHz, VIN = VOUT + 2V Output Voltage Noise Output Current Limit ILIM Fold-Back Current Limit VRMS Logic-High VIH VIN = 5V 1.2 -- -- Logic-Low VIL VIN = 5V -- -- 0.4 Thermal Shutdown Temperature TSD ILOAD = 30mA, VIN  1.5V -- 150 -- C Thermal Shutdown Hysteresis TSD -- 20 -- C Enable Input Voltage V 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 high effective thermal conductivity four-layer test board per JEDEC 51-7. 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. The dropout voltage is defined as VIN − VOUT, when VOUT is 98% of the normal value of VOUT. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9073 Typical Application Circuit RT9073 VIN CIN 1µF EN VIN VOUT VOUT COUT 1µF SNS EN GND Figure 1. Application with Sense Function RT9073N VIN CIN 1µF EN VIN VOUT COUT 1µF VOUT EN GND Figure 2. Application without Sense Function RT9073 VIN VOUT 1µF R1 NC 1µF SNS EN R2 GND Figure 3. Adjustable Output Voltage Application Circuit Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Typical Operating Characteristics Output Voltage vs. Temperature Output Voltage vs. Temperature 0.91 3.32 0.90 Output Voltage (V) Output Voltage (V) 3.31 3.30 3.29 ILOAD = 1mA ILOAD = 250mA 3.28 3.27 ILOAD = 1mA ILOAD = 250mA 0.89 0.88 0.87 3.26 VIN = 5V VOUT = 3.3V VIN = 5V VOUT = 0.9V 0.86 3.25 -50 -25 0 25 50 75 100 -50 125 -25 0 25 50 75 100 125 Temperature (°C) Temperature (°C) Output Voltage vs. Input Voltage Output Voltage vs. Output Current 3.33 0.904 0.902 Output Voltage (V) Outout Voltage (V) 3.32 0.900 0.898 0.896 0.894 3.31 3.3 3.29 0.892 VOUT = 0.9V, ILOAD = 1mA VIN = 5V VOUT = 3.3V 0.890 3.28 1 1.5 2 2.5 3 3.5 4 4.5 5 0 5.5 30 Input Voltage (V) 90 120 150 180 210 240 Output Current (mA) Ground Current vs. Input Voltage Ground Current vs. Temperature 2.1 1.5 1.8 1.4 Ground Current (μA) Ground Current (μA) 60 1.5 1.2 0.9 0.6 0.3 1.3 1.2 1.1 1 0.9 VOUT = 0.9V 0 VIN = 5V, VOUT = 3.3V 0.8 1 1.5 2 2.5 3 3.5 4 4.5 5 Input Voltage (V) Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 5.5 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9073 Shutdown Current vs. Temperature Shutdown Current vs. Input Voltage 0.50 VOUT = 0.9V, VEN = 0V Shutdown Current (μA)1 0.45 Shutdown Current (μA)1 0.30 0.40 0.35 0.30 0.25 0.20 0.15 0.10 VEN = 0V 0.25 0.20 0.15 0.10 VIN = 5V VIN = 3.5V 0.05 0.05 0.00 0.00 1.2 1.6 2 2.4 2.8 3.2 3.6 4 -50 4.4 4.8 5.2 5.6 -25 0 Input Voltage (V) EN Threshold vs. Input Voltage 0.70 25 50 75 100 125 Temperature (°C) EN Threshold vs. Temperature 1.00 EN_H 0.60 0.80 EN_L EN Threshold (V) EN Threshold (V) 0.65 0.55 0.50 0.45 0.40 EN_H 0.60 EN_L 0.40 0.20 0.35 VIN = 5V 0.30 0.00 1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 -50 -25 0 Dropout Voltage vs. Temperature 0.40 50 75 100 125 Dropout Voltage vs. Output Current 1.6 VOUT = 3.3V 0.35 VOUT = 0.9V 1.4 0.30 0.25 Dropout Voltage (V) Dropout Voltage (V) 25 Temperature (°C) Input Voltage (V) ILOAD = 100mA 0.20 0.15 ILOAD = 50mA 0.10 ILOAD = 20mA 0.05 1.2 1.0 TA = 125°C TA = 85°C TA = 25°C TA = −40°C 0.8 0.6 0.4 0.2 0.00 0.0 -50 -25 0 25 50 75 100 Temperature (°C) Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 125 0 50 100 150 200 250 Output Current (mA) is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Dropout Voltage vs. Output Current Dropout Voltage vs. Output Current 1.4 1.2 VOUT = 1.5V 1.0 Dropout Voltage (V) Dropout Voltage (V) 1.2 VOUT = 2.5V 1.0 0.8 0.6 TA = 125°C TA = 85°C TA = 25°C TA = −40°C 0.4 0.2 0.8 TA = 125°C TA = 85°C TA = 25°C TA = −40°C 0.6 0.4 0.2 0.0 0.0 0 50 100 150 200 0 250 50 420 Fold-Back Current Limit (mA) VIN = 5V Current Limit (mA) 480 VOUT = 0.9V 380 VOUT = 3.3V 330 -50 VIN = 5V 370 VOUT = 0.9V 320 VOUT = 3.3V 270 -25 0 25 50 75 100 125 -50 -25 0 50 75 100 125 SNS Input Current vs. Temperature Ground Current vs. Load Current 700 SNS Input Current (nA) VIN = 5V 150 100 TA = −40°C TA = 25°C TA = 125°C 50 0 0.01 25 Temperature (°C) Temperature (°C) GND Current (μA) 250 220 280 200 200 Fold-Back Current Limit vs. Temperature Current Limit vs. Temperature 430 150 Output Current (mA) Output Current (mA) 530 100 VOUT = 0.9V VOUT = 3.3V 600 500 VIN = 5V 400 0.1 1 10 100 1000 Load Current (mA) Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 10000 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9073 Power On from EN Power Off from EN VIN (2V/Div) VEN (2V/Div) VOUT (2V/Div) VIN (2V/Div) VEN (2V/Div) VOUT (2V/Div) I LOAD (100mA/Div) VIN = 5V I LOAD (100mA/Div) VIN = 5V Time (50μs/Div) Time (25μs/Div) Line Transient Load Transient VIN (200mV/Div) VIN (2V/Div) VOUT (5mV/Div) VIN = 2.4V to 5.5V, VOUT = 0.9V, ILOAD = 10mA I LOAD (100mA/Div) VIN = 5V, VOUT = 3.3V, ILOAD = 10mA to 250mA Time (250μs/Div) Time (250μs/Div) PSRR vs. Frequency Output Noise Output Noise 0 VIN = 3.5V, ILOAD = 150mA VIN = 3V, ILOAD = 50mA VIN = 3.5V, ILOAD = 50mA Noise (μV) PSRR (dB) -20 -40 -60 -80 -100 10 100 1000 10000 100000 Frequency (Hz) Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 1000000 300 270 240 210 180 150 120 90 60 30 0 -30 -60 -90 -120 -150 -180 -210 -240 -270 -300 VIN = 2.9V, VOUT = 0.9V, ILOAD = 100mA COUT = 1μF, f = 10Hz to 100kHz 0 1 2 3 4 5 6 7 8 9 10 sec (m) is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Application Information Output Voltage vs. Temperature 3.30 3.29 3.28 Output Voltage (V) Like any low dropout linear regulator, the RT9073’s external input and output capacitors must be properly selected for stability and performance. Use a 1μF or larger input capacitor and place it close to the IC's VIN and GND pins. Any output capacitor meeting the minimum 1mΩ ESR (Equivalent Series Resistance) requirement may be used. Place the output capacitor close to the IC's VOUT and GND pins. Increasing capacitance and decreasing ESR can improve the circuit's PSRR and line transient response. 3.27 ILOAD = 1mA 3.26 3.25 3.24 3.23 3.22 Enable 3.21 The RT9073 has an EN pin to turn on or turn off the regulator, When the EN pin is in logic high, the regulator will be turned on. The shutdown current is almost 0μA typical. The EN pin may be directly tied to VIN to keep the part on. The Enable input is CMOS logic and cannot be left floating. 3.20 Adjustable Output Voltage Setting Because of the small input current at the SNS pin, the RT9073 with SNS pin also can work as an adjustable output voltage LDO. Figure 3 gives the connections for the adjustable output voltage application. The resistor divider from VOUT to SNS sets the output voltage when in regulation. -50 -25 0 25 50 75 100 125 Temperature (°C) Figure 4. Temperature Coefficient of Adjustable Output Voltage The minimum recommended 50μA in the resistor divider makes the application no longer an ultra low quiescent LDO. Figure 5 is another fine adjustable output voltage application can keep the LDO still operating in low power consumption. The fine fune range is recommended to be less than 50mV (R1 ≤ 91kΩ) in order to keep a good temperature coefficient of the output voltage. RT9073 The voltage on the SNS pin sets the output voltage and is determined by the values of R1 and R2. In order to keep a good temperature coefficient of output voltage, the values of R1 and R2 should be selected carefully to ignore the temperature coefficient of input current at the SNS pin. A current greater than 50μA in the resistor divider is recommended to meet the above requirement. The adjustable output voltage can be calculated using the formula given in equation 1 : VOUT  R1 + R2  VSNS (1) R2 where VSNS is determined by the output voltage selections in the ordering information of RT9073. When we choose 39kΩ and 15kΩ as R1 and R2 respectively, and select a 0.9V output at SNS pin, the adjustable output voltage will be set to around 3.24V. Its temperature coefficient in Figure 4 is still perfect in such kind of application. Copyright © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 VIN VOUT 1µF R1 SNS 56pF/NC 1µF EN GND Figure 5. Fine Adjustable Output Voltage Application Circuit There isn't extra current consumption in the above application. But the temperature coefficient of output voltage will be degraded by the input current at SNS pin. If the tuning range is larger than 50mV, a compensation capacitor (56pF) is required to keep the stability of output voltage. The fine adjustable output voltage is calculated using the formula given in equation2 : VOUT  VSNS + ISNS  R1 (2) is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT9073 where ISNS is the input Current at SNS pin (typical 550nA at room temperature) and VSNS is determined by the output voltage selections in the ordering information of RT9073. The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. The derating curve in Figure 6 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Current Limit 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 : 0.8 Maximum Power Dissipation (W)1 The RT9073 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 0.35A (typ.). The current limiting level is reduced to around 250mA named fold-back current limit when the output voltage is further decreased. The output can be shorted to ground indefinitely without damaging the part. Four-Layer PCB 0.6 SOT-23-5 0.4 SC-70-5 0.2 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 6. Derating Curve of Maximum Power Dissipation 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 and TA is the ambient temperature. The junction to ambient thermal resistance, θJA, is layout dependent. For SOT-23-5 package, the thermal resistance, θJA, is 218.1°C/W on a standard JEDEC 51-7 four-layer thermal test board. For SC-70-5 package, the thermal resistance, θJA, is 342.3°C/ W on a standard JEDEC 51-7 four-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) / (218.1°CW) = 0.45W for SOT-23-5 package PD(MAX) = (125°C − 25°C) / (342.3°CW) = 0.29W for SC-70-5 package Copyright © 2015 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS9073-02 March 2015 RT9073 Outline Dimension H D L B C b A A1 Symbol e 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 © 2015 Richtek Technology Corporation. All rights reserved. DS9073-02 March 2015 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT9073 H D L B C b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.800 1.100 0.031 0.044 A1 0.000 0.100 0.000 0.004 B 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 C 1.800 2.450 0.071 0.096 D 1.800 2.250 0.071 0.089 e 0.650 0.026 H 0.080 0.260 0.003 0.010 L 0.210 0.460 0.008 0.018 SC-70-5 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. www.richtek.com 14 DS9073-02 March 2015