RT9070B 70V, Low Dropout Voltage Linear Regulator General Description Features The RT9070B is a high voltage (70V operation), low quiescent current, low dropout linear regulator. The device supplies 20mA output current with a maximum dropout voltage of 230mV. Its low quiescent and shutdown currents (23A operating and 3A shutdown) are ideal for use in battery-powered and/or high voltage systems. Ground current is well-controlled in all conditions, including dropout. The RT9070B operates with any reasonable output capacitors including 1F low-ESR ceramic types. It features excellent line and load transient responses. Internal protection circuitry includes reverse-battery protection, current limiting, thermal shutdown, and reverse current protection. Wide Input Voltage Range: 4.5V to 70V Low Quiescent Current: 23A Operating and 3A Shutdown Low Dropout Voltage: 180mV (typical) at 20mA Adjustable (1.25V to 60V) Output Voltage 2% Initial Output Tolerance Stable with 1F Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors No Reverse-Current Protection Diode Needed 70V Reverse-Battery Protection Internal Current Limit Internal Thermal Shutdown Protection Marking Information The RT9070B has an adjustable output voltage (1.25V to 60V). It is available in the SOT-23-5 package. 6A=DNN 6A= : Product Code DNN : Date Code Applications Low Current, High Voltage Regulators Battery Powered Applications Telecom and Datacom Applications Automotive Applications Simplified Application Circuit RT9070B VIN VIN VOUT VOUT R1 CIN CCOMP COUT FB SHDN R2 GND Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 June 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9070B Ordering Information Pin Configurations RT9070B (TOP VIEW) Package Type B : SOT-23-5 VOUT Lead Plating System G : Green (Halogen Free and Pb Free) 5 4 2 Note : 3 VIN GND SHDN Richtek products are : FB RoHS compliant and compatible with the current SOT-23-5 requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Functional Pin Description Pin No. Pin Name Pin Function 5 VOUT Output Voltage Pin. The VOUT pin supplies power to the load. A minimum output capacitor of 1F is required for stable operation. 4 FB Feedback Voltage Input. Connect to the center tap of a resistor divider for setting the output voltage. 2 GND Ground. 3 SHDN Shutdown Control Input. Connect SHDN of high to disable the output voltage and reduce the IC’s quiescent current to 3A (typical). Connect SHDN low to enable the output. SHDN is a high-voltage pin and can be connected directly to a high-voltage input less than 60V. 1 VIN Power Input. Bypass VIN with a 0.18F or larger capacitor with adequate voltage rating. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016 RT9070B Function Block Diagram VOUT VIN Current Limit SHDN - + OverTemperature Protection FB VREF GND Operation The RT9070B is a high input-voltage linear regulator specifically designed to minimize external components. The input voltage range is from 4.5V to 70V. The device Over-Temperature Protection supplies 20mA of output current with a maximum dropout voltage of 230mV. Its 23A quiescent and 3A temperature exceeds 150°C (typ.). Once the junction temperature cools down by approximately 20°C, the shutdown currents make it ideal for use in battery-powered applications. Unlike many PNP LDO regulator will automatically resume operation. regulators, ground current does not increase much in dropout conditions. Output Transistor The RT9070B includes a built-in PNP output transistor configured for low dropout voltage. The output transistor blocks the large reverse current from output to input node if the output voltage is held higher than the input The over-temperature protection function will turn off the PNP output transistor when the internal junction Reverse-Battery Protection The RT9070B VIN can withstand reverse voltages as high as 70V. Both the IC and the load are protected and no negative voltage will appear at the output. Reverse-Output Protection The RT9070B protects against current flow to the input (VIN) when the output voltage exceeds VIN. voltage (such as in battery-backup applications), because there is no parasitic diode across VIN and If the input is left open circuit or grounded, the FB pin will act like a resistor (typically 10k) in series with a diode VOUT directly. when pulled above ground. If the FB pin is connected to a resistor divider now and the output voltage is held Error Amplifier The Error Amplifier compares the output feedback voltage at FB to an internal reference voltage and controls the PNP output transistor's base current to maintain output voltage regulation. higher than the input voltage, a current will conduct from output via the resistor divider and FB node to ground. Because the current is limited by the resistor divider and FB internal resistor, no additional output blocking diode is needed if the limited current is acceptable. Current Limit Protection Shutdown Control The RT9070B provides a current limit function to prevent damage during output over-load or shorted-circuit conditions. The output current is detected by an internal current-sense transistor. The RT9070B SHDN input is an active-high input that turns off the output transistor and reduces the quiescent current to 3A typical. Connect SHDN to a voltage below 0.4V for normal operation. Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 June 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9070B Absolute Maximum Ratings (Note 1) VIN Pin Voltage -------------------------------------------------------------------------------------------------------- 70V to 80V SHDN Pin Voltage ---------------------------------------------------------------------------------------------------- 0.3V to 60V VOUT to GND Voltage ----------------------------------------------------------------------------------------------- 70V to 70V VOUT to VIN Voltage------------------------------------------------------------------------------------------------- 70V to 70V FB Pin Voltage --------------------------------------------------------------------------------------------------------- 0.3V to 7V Power Dissipation, PD @ TA = 25C SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.45W Package Thermal Resistance (Note 2) SOT-23-5, JA ---------------------------------------------------------------------------------------------------------- 218.1C/W SOT-23-5, JC ---------------------------------------------------------------------------------------------------------- 28.5C/W Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260C Junction Temperature ------------------------------------------------------------------------------------------------ 150C Storage Temperature Range --------------------------------------------------------------------------------------- 65C to 150C ESD Susceptibility (Note 3) HBM (Human Body Model) ----------------------------------------------------------------------------------------- 2kV MM (Machine Model) ------------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 4) Supply Input Voltage ------------------------------------------------------------------------------------------------- 4.5V to 70V Ambient Temperature Range--------------------------------------------------------------------------------------- 40C to 85C Junction Temperature Range -------------------------------------------------------------------------------------- 40C to 125C Electrical Characteristics (4.5V < VIN < 70V, VSHDN = 0V , FB pin connected to VOUT pin, COUT = 1F (ceramic), TA = 25C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit ILOAD = 20mA 4.5 -- 70 V VIN = 12V, ILOAD = 100A 1.23 1.25 1.27 100A < ILOAD < 20mA 1.21 1.25 1.29 Input Voltage VIN FB Pin Voltage VFB Line Regulation VLINE VIN = 4.5V to 70V, ILOAD = 100A -- 1 10 mV Load Regulation VLOAD VIN = 12V, ILOAD = 100A to 20mA -- 3 25 mV ILOAD = 100A -- 9 50 ILOAD = 1mA -- 37 100 ILOAD = 10mA -- 130 200 ILOAD = 20mA -- 180 230 ILOAD = 0mA -- 20 30 ILOAD = 20mA -- 750 1200 COUT = 1F, ILOAD = 20mA, BW = 10Hz to 100kHz -- 120 -- Dropout Voltage VDROP GND Pin Current IGND Output Voltage Noise VON Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 V mV A VRMS is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016 RT9070B Parameter FB Pin Bias Current Symbol Test Conditions IFB Min Typ Max Unit -- 8 100 nA VIH On to Off -- -- 2 VIL Off to On 0.4 -- -- SHDN Pin Current ISHDN VSHDN = 2V -- 0.4 2 A Quiescent Current in Shutdown ISD VIN = 6V, or VSHDN = 0V -- 3 10 A Power Supply Rejection Rate PSRR VIN = 7V (Avg), VRIPPLE = 0.5 VP-P, f RIPPLE = 120Hz, ILOAD = 20mA -- 75 -- dB Output Current Limit ILIM VIN = 12V, VOUT = 11V, VFB = 1.2V 25 40 -- mA Input Reverse Leakage Current IVINr VIN = –70V, VOUT = 0V -- -- 6 mA Reverse Output Current IVOUTr FB connect to OUT, VOUT = 1.27V, VIN < 0V -- 19 40 A Over-Temperature Protection TSD -- 150 -- C Shutdown Threshold 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. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. Note 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 June 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9070B Typical Application Circuit VIN 4.5V to 70V RT9070B 1 VIN VOUT 5 CIN 0.18μF R1 CCOMP VOUT COUT 1.25V to 60V 1μF FB 4 3 SHDN R2 GND 2 Figure 1. RT9070B Adjustable Output VIN 4.5V to 70V RT9070B 1 VIN VOUT 5 MJD31C CIN 0.18μF R3 100 3 SHDN FB GND 2 R1 CCOMP COUT 10μF VOUT 1.25V to 60V 4 R2 Figure 2. RT9070B External Transistor Application Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016 RT9070B Typical Operating Characteristics Output Voltage vs. Load Current Quiescent Current vs. Supply Voltage 0.40 30 Quiescent Current (μA) 0.32 Output Voltage (%) 0.24 0.16 0.08 0.00 -0.08 -0.16 -0.24 -0.32 25 20 15 10 5 VIN = 12V, VOUT = 3.3V 0 -0.40 0 2.5 5 7.5 10 12.5 15 17.5 0 20 10 Output Voltage vs. Temperature 40 50 60 70 Quiescent Current vs. Temperature 0.5 40 0.4 Quiescent Current (µA) 35 0.3 0.2 0.1 VIN = 4.5V 0.0 VIN = 70V -0.1 -0.2 -0.3 30 25 20 15 10 5 -0.4 VIN = 12V IOUT = 0.1mA 0 -0.5 -50 -25 0 25 50 75 100 -50 125 -25 0 Temperature (°C) 25 50 75 100 125 Temperature (°C) PSRR vs. Frequency Shutdown Current vs. Supply Voltage 0 10 COUT = 4.7μF -20 COUT = 0.47μF 9 Shutdown Current (μA)1 -10 -30 PSRR (dB) 30 Supply Voltage (V) Load Current (mA) Output Voltage (%) 20 -40 -50 -60 -70 -80 8 7 6 5 4 3 2 1 -90 0 -100 10 100 1000 10000 100000 Frequency (Hz) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 June 2016 1000000 0 10 20 30 40 50 60 70 Supply Voltage (V) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9070B Current Limit vs. Supply Voltage Output Voltage vs. Supply Voltage 80 0.1 0.0 60 Output Voltage (%) Current Limit (mA) 70 50 40 30 20 -0.1 -0.2 IOUT = 0mA IOUT = 0.1mA -0.3 IOUT = 1mA IOUT = 20mA -0.4 10 0 -0.5 0 10 20 30 40 50 60 70 0 10 Supply Voltage (V) 20 30 40 50 60 70 Supply Voltage (V) Ground Current vs. Supply Voltage Reverse Current vs. Temperature 1000 12 10 800 Reverse Current (μA) Ground Current (μA) 900 IOUT = 0mA 700 IOUT = 0.1mA 600 IOUT = 1mA 500 IOUT = 10mA 400 IOUT = 20mA 300 200 8 6 4 2 100 VIN = 70V 0 0 0 10 20 30 40 50 60 70 -50 -25 0 25 50 Supply Voltage (V) Temperature (°C) Dropout Voltage vs. Temperature VOUT vs. VIN 75 100 125 300 IOUT = 0.1mA Dropout Voltage (mV) 250 IOUT =1mA +80V IOUT = 10mA 200 IOUT = 20mA VIN (30V/Div) 150 100 VOUT (2V/Div) 80V 50 IOUT = 20mA, COUT = 1F 0 -50 -25 0 25 50 75 100 Temperature (°C) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 125 Time (1ms/Div) is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016 RT9070B Line Transient Waveform Rising Line Transient Waveform Falling VIN (10V/Div) VIN (10V/Div) VOUT_AC (100mV/Div) VOUT_AC (100mV/Div) VOUT = 3.3V, IOUT = 20mA, COUT = 1F, CCOMP = 220pF Time (25s/Div) Time (25s/Div) Line Transient Waveform Full Load Transient Waveform IOUT (10mA/Div) VIN (10V/Div) VOUT_AC (20mV/Div) VOUT_AC (100mV/Div) VOUT = 3.3V, IOUT = 20mA, COUT = 1F, CCOMP = 220pF Time (50s/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 VOUT = 3.3V, IOUT = 20mA, COUT = 1F, CCOMP = 220pF June 2016 VIN = 12V, VOUT = 3.3V, COUT = 10F, CCOMP = 220pF Time (50s/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9070B Application Information The RT9070B is a high input-voltage linear regulator specifically designed to minimize external components. The input voltage range is from 4.5V to 70V. The device supplies 20mA of output current with a maximum dropout voltage of 230mV. Adjustable Output Voltage and Compensation The adjustable output may be set to provide from 1.25V to 60V, using external feedback voltage divider resistors (Figure 1). To achieve the correct compensation (with your external FB divider, use a lower divider resistor (R2) value below 100k. Calculate R1 according to the following formula : R2 = R1 / (VOUT / 1.25V – 1). Then, calculate the compensation capacitor (CCOMP) value according to the following formula : CCOMP = 25s/R1 Thermal Considerations The RT9070B’s high input-voltage capability and high output current capability require careful use to avoid over-heating the IC and activating the internal thermal protection. To avoid thermal shutdown, do not exceed the IC’s maximum operating junction temperature range of 125C. 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) / JA Added External NPN for High-Current Applications where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and JA is the junction to Higher ambient thermal resistance. output currents and/or increased power dissipation are possible using an external NPN output transistor. VOUT drives the base of the transistor and FB monitors the actual output voltage, as in normal applications. The output (Figure 2) can be used. Component Selection A low-ESR capacitor such as ceramic type must be connected between VIN and GND with short, wide traces to bypass input noise. RT9070B is designed to work with small input capacitor to reduce the cost from high-voltage low-ESR requirement. To guarantee a minimum 0.1F input capacitance, a ceramic 0.18F input capacitor with an appropriate voltage rating is recommended. The RT9070B operates with any reasonable output capacitor including low-ESR ceramic types. Low-ESR aluminum and tantalum capacitor may also be used. A minimum of 1F is recommended and much higher values are also acceptable. Connect the output capacitor between VOUT and GND with short, wide traces to keep the circuit stable. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 For recommended operating condition specifications, the maximum junction temperature is 125C. The junction to ambient thermal resistance, JA, is layout dependent. For SOT-23-5 package, the thermal resistance, JA, is 218.1C/W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25C can be calculated by the following formula : PD(MAX) = (125C 25C) / (218.1C/W) = 0.45W for SOT-23-5 package The maximum power dissipation depends on the operating ambient temperature for fixed TJ(MAX) and thermal resistance, JA. The derating curve in Figure 3 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016 RT9070B Maximum Power Dissipation (W)1 0.5 Four-Layer PCB 0.4 0.3 0.2 0.1 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 3. Derating Curve of Maximum Power Dissipation Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS9070B-01 June 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT9070B Outline Dimension 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 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. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS9070B-01 June 2016