RTQ2511-QA RICHTEK | Alldatasheet
Document overview
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Technical content
Features
AEC-Q100 Grade 1 Qualified 2A Ground Current at No Load ±2% Output Accuracy 200mA Output Current Maximum Operating Input Voltage 14V Dropout Voltage : 0.4V at 100mA Support Fixed Output Voltage from 2.5V to 9V (0.1V per step, 3.3V and 5V are available) Current-Limit Protection Over-Temperature Protection RoHS Compliant and Halogen Free
Ordering Information
QW : WDFN-8L 3x3 (W-Type) RTQ2511- Lead Plating System G : Green (Halogen Free and Pb Free) Output Voltage 25 : 2.5V 28 : 2.8 30 : 3.0V 33 : 3.3V 50 : 5V 62 : 6.2V 80 : 8V 90 : 9V -QA Grade QA : AEC-Q100 Qualified and Screened by High Temperature Simplified Application Circuit VCC EN VOUT GND COUTCIN VOUT RTQ2511 VCC EN
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2511-QA-00 November 2020 Pin Configuration (TOP VIEW) VOUT NC NC VCC NC EN NC GND GND WDFN-8L 3x3 Functional Pin Description Pin No. Pin Name Pin Function 1 VOUT Output of the regulator. 2, 4, 5, 7 NC No internal connection. 3, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. 6 EN Enable control input. 8 VCC Supply voltage input. Functional Block Diagram VCC GND EN VOUT Current/Thermal Sense Band Gap Reference
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2511-QA-00 November 2020 www.richtek.com Operation Basic Operation The RTQ2511 is a low quiescent current linear regulator designed especially for low external component systems. The input voltage range is from 3.5V to 14V. The minimum required output capacitance for stable operation is 1F effective capacitance after consideration of the temperature and voltage coefficient of the capacitor. Output Transistor The RTQ2511 builds in a P-MOSFET output transistor which provides a low switc h-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. Enable The RTQ2511 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 zero. Current-Limit Protection The RTQ2511 provides current limit function to prevent the device from damages during over -load or shorted- circuit conditions. This current is detected by an internal sensing transistor. Over-Temperature Protection The over-temperature protection function t urns off the P-MOSFET when the junction temperature exceeds 150C (typ.) and the output current exceeds 30mA. Once the junction temperature cools down by approximately 20 C, the regulator automatically resumes operation.
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2511-QA-00 November 2020 Absolute Maximum Ratings (Note 1) VOUT to GND Power Dissipation, PD @ TA = 25°C Package Thermal Resistance (Note 2) ESD Susceptibility (Note 3) Recommended Operating Conditions (Note 4)
Electrical Characteristics
(VCC = 14V, TJ = 40C to 125C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage VCC 3.5 -- 14 V Output Voltage Range VOUT 2.5 -- 12 V DC Output Accuracy VOUT ILOAD = 1mA, VCC = 14V 2 -- 2 % Dropout Voltage VDROP ILOAD = 100mA, VCC > 4.5V -- 0.4 1.2 V ILOAD = 100mA, VCC > 3.5V and < 4.5V -- -- 1.5 V VCC Consumption Current IQ ILOAD = 0mA, VOUT 5.5V -- 2 3.5 μA ILOAD = 0mA, VOUT > 5.5V -- 3.5 5 μA Shutdown GND Current VEN = 0V, VCC = 14V, VOUT = 0V -- 0.01 1 μA EN Input Current IEN VEN = 14V, VCC = 14V -- -- 0.1 μA Line Regulation VLINE ILOAD = 1mA, 5.5V < VCC < 14V -- -- 0.4 % ILOAD = 1mA, 3.5V < VCC < 5.5V -- 0.1 0.3 %
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2511-QA-00 November 2020 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Unit Load Regulation VLOAD 1mA < ILOAD < 100mA, 40°C TJ 105°C, VCC = VOUT + 2V -- 0.5 1 % Load Regulation VLOAD 1mA < ILOAD < 100mA, 105°C TJ 125°C, VCC = VOUT + 2V -- -- 2 % Output Current Limit ILIM VCC = VOUT + 2V 210 350 490 mA Enable Input Voltage Logic-High VIH 1.7 -- -- V Logic-Low VIL -- -- 0.6 Thermal Shutdown Temperature TSD ILOAD = 30mA, (Note 5) -- 150 -- °C Thermal Shutdown Hysteresis TSD (Note 5) -- 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. JA is measured under natural convection (still air) at TA = 25C with the component mounted on a high effective-thermal- conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. JC 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. Note 5. Guarantee by design. Typical Application Circuit VCC EN VOUT GND COUTCIN VOUT RTQ2511 VCC EN 1μF 3.5V to 14V (Effective Capacitance 1μF) 8 1 3, 9 (Exposed Pad) Note : All input and output capacitance in the suggested parameter mean the effective capacitance. The ef fective capacitance needs to consider any De-rating Effect like DC bias.
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2511-QA-00 November 2020 Typical Operating Characteristics Output Voltage vs. Temperature 3.20 3.22 3.24 3.26 3.28 3.30 -50 -25 0 25 50 75 100 125 Temperature (°C) Output Voltage (V) VOUT = 3.3V VCC = 4.3V, Load = 0.1mA VCC = 14V, Load = 0.1mA Output Voltage vs. Output Current 3.20 3.22 3.24 3.26 3.28 3.30 0 20 40 60 80 100 120 140 160 180 200 Output Current (mA) Output Voltage (V) VCC = 4.3V VCC = 14V VOUT = 3.3V Output Voltage vs. Input Voltage 3.20 3.22 3.24 3.26 3.28 3.30 4 5 6 7 8 9 10 11 12 13 14 Input Voltage (V) Output Voltage (V) Load = 0mA Load = 0.1mA Load = 10mA Load = 20mA VOUT = 3.3V Quiescent Current vs. Temperature 0.0 0.5 1.0 1.5 2.0 2.5 -50 -25 0 25 50 75 100 125 Temperature (°C) Quiescent Current (μA) 1 VCC = 14V VCC = 4.3V Quiescent Current vs. Input Voltage 1.0 1.2 1.4 1.6 1.8 2.0 4 5 6 7 8 9 10 11 12 13 14 Input Voltage (V) Quiescent Current (μA) 1 VOUT = 3.3V SHDN Input Leakage Current vs. VIN 4 6 8 10 12 14 Input Voltage (V) Shutdown Current (nA) 1 EN = 0V
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2511-QA-00 November 2020 www.richtek.com SHDN Input Leakage Current vs. Temperature 0.0 0.2 0.4 0.6 0.8 1.0 -50 -25 0 25 50 75 100 125 Temperature (°C) Shutdown Leakage Current (μA) 1 VCC = 14V VCC = 4.3V EN = 0V Enable Threshold vs. Input Voltage 0.0 0.4 0.8 1.2 1.6 2.0 4 6 8 10 12 14 Input Voltage (V) EN Voltage (V) High Threshold Low Threshold Enable Threshold vs. Temperature 0.0 0.4 0.8 1.2 1.6 2.0 -50 -25 0 25 50 75 100 125 Temperature (°C) EN Voltage (V) High Threshold Low Threshold VCC = 14V Dropout Voltage vs. Load Current 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 50 100 150 200 Load Current (mA) Dropout Voltage (V) 125°C 25°C -40°C Current Limit vs. Temperature 100 150 200 250 300 350 400 450 -50 -25 0 25 50 75 100 125 Temperature ( °C ) Current Limit (A) VCC = 4.3V VCC = 14V VOUT = 3.3V Ground Current vs. Load Current 100 150 200 250 0.001 0.01 0.1 1 10 100 1000 Load Current (mA) GND Current (μA) 1 Rising, TA = +125°C Rising, TA = +25°C Rising, TA = -40°C
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2511-QA-00 November 2020 -80 -60 -40 -20 10 100 1000 10000 PSRR (dB) Frequency (Hz) PSRR vs. Frequency Vcc = 4.3V, VOUT = 3.3V, Load = 100mA Line Transient Response Time (100μs/Div) VOUT_ac (20m/Div) VIN (5V/Div) Vcc = 6V to 12V, VOUT = 3.3V, ILOAD = 100mA Load Transient Response Time (250μs/Div) VOUT_ac (100mV/Div) ILOAD (100mA/Div) Vcc = 4.3V, VOUT = 3.3V, ILOAD = 10mA to 150mA Power On from EN Time (25μs/Div) Vcc (10V/Div) EN (2V/Div) VOUT (2V/Div) ILOAD (100mA/Div) Vcc = 12V, VOUT = 3.3V, ILOAD = 100mA Power Off from EN Time (25μs/Div) Vcc (10V/Div) EN (2V/Div) VOUT (2V/Div) ILOAD (100mA/Div) Vcc = 12V, VOUT = 3.3V, ILOAD = 100mA Load Transient Response Time (250μs/Div) VOUT_ac (50mV/Div) ILOAD (50mA/Div) Vcc = 12V, VOUT = 3.3V, ILOAD = 10mA to 100mA
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2511-QA-00 November 2020 www.richtek.com
Application Information
Like any low dropout linear regulator, the RTQ2511's external input and output capacitors must be properly selected for stability and performance. Use a 1 µF or larger input capacitor and place it close to the IC's VCC and GND pins. Any output capacitor meeting meets the minimum 1mΩ ESR (Equivalent Series Resistance) and effective capacitance larger than 1F 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 circu it's PSRR and line transient response. Enable The RTQ2511 goes into sleep mode when the EN pin is in a logic low condition. During this condition, the RTQ2511 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 0 A typical. The EN pin may be directly tied to Vcc to keep the part on. The Enable input is CMOS logic and cannot be left floating. PSRR The power supply rejection ratio (PSRR) is defined as the gain from the input to output divided by the gain from the supply to the output. The PSRR is found to be PSRR=20 x log(∆Gain Error ∆Supply ) Note that in heavy load measuring, Δsupply will cause Δtemperature. And Δtemperature will cause Δoutput voltage. So the temperature effect is include in heavy load PSRR measuring. Current Limit The RTQ2511 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 0.35A (typ.). The output can be shorted to gr ound indefinitely without damaging the part. Thermal Considerations The junction temperature should never exceed the absolute maximum junction temperature TJ(MAX), listed under Absolute Maximum Ratings, to avoid permanent damage to the device. The maximum allowable power dissipation depends on the thermal resistance of the IC package, the PCB layout, the rate of surrounding airflow, and the difference between the junction and ambient temperatures. The maximum power dissipation can be calculated using the following formula : PD(MAX) = (TJ(MAX) TA) / JA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and JA is the junction-to- ambient thermal resistance. For continuous operation, the maximum operating junction temperature indicated under Recommended Operating Conditions is 150C. The junction-to-ambient thermal resistance,JA, is highly package dependent. For a WDFN-8L 3x3 package, the thermal resistance, JA, is 35C/W on a standar d JEDEC 51 -7 high effective-thermal-conductivity four-layer test board. The maximum power dissipation at T A = 25 C can be calculated as below : PD(MAX) = (150C 25C) / (35C/W) = 3.57W for a WDFN-8L 3x3 package. The maximum power dissipation depends on the operating ambient temperature for fixed TJ(MAX) and thermal resistance, JA. The derating curve in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Figure 1. Derating Curve of Maximum Power Dissipation
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2511-QA-00 November 2020 Outline Dimension 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 0.300 0.008 0.012 D 2.950 3.050 0.116 0.120 D2 2.100 2.350 0.083 0.093 E 2.950 3.050 0.116 0.120 E2 1.350 1.600 0.053 0.063 e 0.650 0.026 L 0.425 0.525 0.017 0.021 W-Type 8L DFN 3x3 Package
Copyright © 2020 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2511-QA-00 November 2020 www.richtek.com Footprint Information Package Number of Pin Footprint Dimension (mm) Tolerance P A B C D Sx Sy M 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.