RT2517AGQV

® RT2517A 1A, 6V, Ultra Low Dropout Linear Regulator General Description Features The RT2517A is a high performance positive voltage regulator designed for applications requiring low input voltage and ultra low dropout voltage at up to 1A. The feature of ultra low dropout voltage is ideal for applications where output voltage is very close to input voltage. The input voltage can be as low as 2.2V and the output voltage is adjustable by an external resistive divider. The RT2517A provides an excellent output voltage regulation over variations in line, load and temperature. Current limit and thermal shutdown functions are provided. Additionally, an enable pin is designed to further reduce power consumption while shutdown and the shutdown current is as low as 0.1μA.  The RT2517A is available in the VDFN-8AL 3x3 package.  Ordering Information Marking Information       Input Voltage Range : 2.2V to 6V VOUT Range from 1.2V to VIN − VDROP Reference Voltage : 1.2V ±2.5% over −40°°C to 85°°C Ultra Low Dropout Voltage : 150mV at 1A over −40°°C to 85°°C Low Quiescent 0.1μ μA in Shutdown Mode Soft-Discharge Function Thermal Shutdown and Current Limit Applications    Automotive Audio, Navigation, & Info systems Industrial Grade General Purpose Point of Load Digital Set top Boxes Vehicle Electronics RT2517A 27= : Product Code Pin 1 Orientation*** (2) : Quadrant 2, Follow EIA-481-D YMDNN : Date Code 27=YM DNN Package Type QV : VDFN-8AL 3x3 (V-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Pin Configuration (TOP VIEW) Note : ***Empty means Pin1 orientation is Quadrant 1 Richtek products are :  1 NC 2 8 VIN 7 IC 6 NC 5 EN GND RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  VOUT ADJ 3 GND 4 Suitable for use in SnPb or Pb-free soldering processes. 9 VDFN-8AL 3x3 Simplified Application Circuit VIN VIN RT2517A VOUT C1 Enable EN Copyright © 2022 Richtek Technology Corporation. All rights reserved. C2 ADJ GND DS2517A-03 April 2022 VOUT R1 R2 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT2517A Functional Pin Description Pin No. 1 Pin Name Pin Function VOUT Output voltage. A minimum 10F capacitor should be placed directly at this pin. 2, 6 NC No internal connection. 3 ADJ Feedback voltage input. Connect an external resistor divider to this pin for output voltage setting. If this pin is connected to the VOUT pin, the output voltage will be set at 1.2V. 4, GND 9 (Exposed pad) Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum the power dissipation. 5 EN Enable control input. Connecting this pin to logic high enables the regulator or driving this pin low puts it into shutdown mode. EN can be connected to VIN if not used. (EN pin is not allowed to be left floating) 7 IC Internal connection. Leave floating and do not make connection to this pin. 8 VIN Supply voltage input. Connect a minimum 10F ceramic capacitor at this pin. Copyright © 2022 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS2517A-03 April 2022 RT2517A Functional Block Diagram RSENSE VOUT VIN VPUMP - - + + ADJ VIN EN VIN Thermal Shutdown VOUT + VIN - Reference Generator GND Reverse Voltage Shutdown Operation The RT2517A is a low input voltage low dropout LDO that can support the input voltage range from 2.2V to 6V and the output current can be up to 1A. The RT2517A uses internal charge pump to achieve low input voltage operation and the internal compensation network is well designed to achieve fast transient response with good stability. In steady-state operation, the feedback voltage is regulated to the reference voltage by the internal regulator. When the feedback voltage signal is less than the reference, the on resistance of the power MOSFET is decreased to increase the output current through the power MOSFET, and the feedback voltage will be charge back to reference. If the feedback voltage is less than the reference, the power MOSFET current is decreased to make the output voltage discharge back to reference by the loading current. Reverse Current Protection The reverse current protection is guarantee by the NMOSFET with bulk capacitors connected to GND and the internal circuit. The reverse voltage detection circuit shuts the total loop down if the output voltage is higher than input voltage. Copyright © 2022 Richtek Technology Corporation. All rights reserved. DS2517A-03 April 2022 Output Under-Voltage Protection (UVP) and OverCurrent Fold-Back When the feedback voltage is lower than 0.15V after internal soft-start end, the UVP is triggered. If the overcurrent condition is trigged during UVP state, the OC limit current will be decreased to limit the output power and change into re-soft start state at the same time. Soft-Start An internal current source charges an internal capacitor to build the soft-start ramp voltage. The typical soft-start time is 150μs. During the soft-start state, the output current will be limited to prevent the inrush current. Over-Temperature Protection (OTP) The RT2517A has an over-temperature protection. When the device triggers the OTP, the device shuts down until the temperature back to normal and move to re-soft start state. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT2517A Absolute Maximum Ratings         (Note 1) Supply Voltage, VIN ----------------------------------------------------------------------------------------------------Other Pins ----------------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C VDFN-8AL 3x3 -----------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) VDFN-8AL 3x3, θJA -----------------------------------------------------------------------------------------------------VDFN-8AL 3x3, θJC -----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------Junction Temperature --------------------------------------------------------------------------------------------------Storage Temperature Range ------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Model) -------------------------------------------------------------------------------------------CDM (Charged Device Model) ----------------------------------------------------------------------------------------MM (Machine Model) ---------------------------------------------------------------------------------------------------- Recommended Operating Conditions    −0.3V to 7V −0.3V to 6V 3.31W 30.2°C/W 5.5°C/W 260°C 150°C −65°C to 150°C 2kV 1kV 200V (Note 4) Supply Input Voltage, VIN ---------------------------------------------------------------------------------------------- 2.2V to 6V Junction Temperature Range ------------------------------------------------------------------------------------------ −40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------------ −40°C to 85°C Electrical Characteristics (VIN = 2.2V to 6V, IOUT = 10μA to 1A, VADJ = VOUT, −40°C ≤ TA ≤ 85°C, unless otherwise specified) Parameter Symbol Test Conditions VIN = 3.3V, TA = 25C Min Typ Max 1 -- 1 2.5 -- 2.5 Unit Output Voltage VOUT Shutdown Current ISHDN VIN = 3.3V, VEN = 0V -- 0.1 -- A Quiescent Current IQ VIN = 3.3V, IOUT = 0A -- 0.4 -- mA Line Regulation VLINE IOUT = 10mA -- 0.01 -- %/V Load Regulation VLOAD IOUT = 10mA to 1A, VIN = 3.3V -- 0.5 -- %A Current Limit ILIM VIN = 3.3V 1.05 1.6 -- A Short-Circuit Current ISC VOUT = 0V -- 700 -- mA Current Foldback Threshold VFold VIN = 3.3V -- 0.4 -- V Dropout Voltage VDROP IOUT = 1A -- 150 300 mV ADJ Reference Voltage VADJ VIN = 3.3V, VADJ = VOUT , IOUT = 10mA 1.192 TA = 25C 1.2 1.216 V ADJ Current IADJ VIN = 3.3V -- 20 -- nA Power Supply Rejection Ratio PSRR f = 100Hz, IOUT = 1A -- 58 -- f = 10kHz, IOUT = 1A -- 37 -- Output Noise Voltage eNO COUT = 10F -- 27 x VOUT -- 2.2V  VIN  6V, 10mA  IOUT  1A Copyright © 2022 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 % dB VRMS is a registered trademark of Richtek Technology Corporation. DS2517A-03 April 2022 RT2517A Parameter EN Input Voltage Symbol Test Conditions Min Typ Max Unit Logic-High VIH 1.7 -- -- Logic-Low VIL -- -- 0.5 -- 0.02 -- A VIN = 6V, VEN = 0V V EN Input Current IEN Thermal Shutdown Threshold TSD -- 160 -- C Thermal Shutdown Hysteresis TSD -- 30 -- 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 high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package. The PCB copper area with exposed pad is 70mm2. Note 3. Devices are ESD sensitive. Handling precautions are recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Copyright © 2022 Richtek Technology Corporation. All rights reserved. DS2517A-03 April 2022 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT2517A Typical Application Circuit RT2517A 8 VIN VIN VOUT C1 10µF Enable R1 10k 5 ADJ 3 EN VOUT 1.8V/1A 1 C2 10µF R2 20k GND 4, 9 (Exposed Pad) Figure 1. 1.8V Output Voltage Operation Circuit Copyright © 2022 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS2517A-03 April 2022 RT2517A Typical Operating Characteristics Quiescent Current vs. Temperature Reference Voltage vs. Temperature 1.15 Quiescent Current (mA) Reference Voltage (V) 1.210 1.205 VIN = 5V VIN = 3.3V 1.200 1.195 1.190 0.95 VIN = 5V 0.75 VIN = 3.3V 0.55 VOUT = 1.8V VOUT = 1.8V 0.35 1.185 -50 -25 0 25 50 75 100 -50 125 -25 0 50 75 Shutdown Current vs. Temperature 125 UVLO vs. Temperature 1.8 1.7 1.4 1.6 UVLO (V) Rising 1.0 VIN = 5V VIN = 3.3V 0.6 1.5 1.4 Falling VOUT = 1.8V VEN = 5V 0.2 1.3 -50 -20 10 40 70 100 130 -50 -25 0 Temperature (°C) 25 50 75 100 125 Temperature (°C) EN Threshold Voltage vs. Temperature Dropout Voltage vs. IOUT 1.3 EN Threshold Voltage (V) 180 Dropout Voltage (mV) 100 Temperature (°C) Temperature (°C) Shutdown Current (µA)1 25 150 120 90 60 125°C 25°C −40°C 30 1.2 Rising 1.1 1.0 Falling 0.9 0.8 VIN = 5V IOUT = 1A 0.7 0 0 0.2 0.4 0.6 0.8 I OUT (A) Copyright © 2022 Richtek Technology Corporation. All rights reserved. DS2517A-03 April 2022 1 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT2517A Line Transient Response Load Transient Response VOUT (10mV/Div) VIN (1V/Div) IOUT (1A/Div) VOUT (10mV/Div) VIN = 3.3V to 4.3V, VOUT = 1.8V, IOUT = 1A VIN = 3.3V, VOUT = 1.8V, IOUT = 0 to 1A Time (100μs/Div) Time (500μs/Div) Power On from EN Power Off from EN VEN (2V/Div) VEN (2V/Div) VOUT (1V/Div) VOUT (1V/Div) I IN (1A/Div) VIN = 2.5V, VOUT = 1.5V, IOUT = 1A I IN (1A/Div) VIN = 2.5V, VOUT = 1.5V, IOUT = 1A Time (100μs/Div) Time (100μs/Div) PSRR vs. Frequency 0 -10 IOUT = 300mA PSRR (dB) -20 -30 IOUT = 100mA -40 IOUT = 1mA -50 -60 -70 VIN = 3.25V to 3.35V, VOUT = 1.8V -80 100 1000 10000 100000 1000000 Frequency (Hz) Copyright © 2022 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. DS2517A-03 April 2022 RT2517A Application Information The RT2517A is a low voltage, low dropout linear regulator with an external bias supply input capable of supporting an input voltage range from 2.2V to 6V and adjustable output voltage from 1.2V to (VIN − VDROP). Output Voltage Setting The RT2517A output voltage is adjustable via the external resistive voltage divider. The output voltage is set according to the following equation : VOUT = VADJ   1+ R1   R2  For ADJ pin noise immunity, the resistive divider total value of R1 and R2 are suggested not over 100kΩ, where VADJ is the reference voltage with a typical value of 1.2V. Dropout Voltage The dropout voltage refers to the voltage difference between the VIN and VOUT pins while operating at specific output current. The dropout voltage VDROP also can be expressed as the voltage drop on the pass-FET at specific output current (IRATED) while the pass-FET is fully operating at ohmic region and the pass-FET can be characterized as an resistance RDS(ON). Thus the dropout voltage can be defined as (VDROP = VIN − VOUT = RDS(ON) x IRATED). For normal operation, the suggested LDO operating range is (VIN > VOUT + VDROP) for good transient response and PSRR ability. Vice versa, while operating at the ohmic region will degrade these performance severely. Chip Enable Operation Feed-Forward Capacitor (CFF) The RT2517A is designed to be stable without the external feed-forward capacitor (C FF). However, an external feedforward capacitor between VOUT and ADJ pin is often adopted to optimizes the transient, noise, and PSRR performance. Regarding to the resistance value of the voltage divider, the recommended CFF values are as below : CFF = 1nF, for both R1 and R2 are larger than 1kΩ CFF = 10nF, for both R1 and R2 are smaller than 1kΩ RT2517A VIN VIN R1 EN *CFF COUT ADJ GND Current Limit The RT2517A contains an independent current limit circuitry, which controls the pass transistor's gate voltage, limiting the output current to 1.6A (typ.). CIN and COUT Selection VOUT VOUT CIN The RT2517A goes into sleep mode when the EN pin is in a logic low condition. In this condition, the pass transistor, error amplifier, and band gap are all turned off, reducing the supply current to only 10μA (max.). The EN pin can be directly tied to VIN to keep the part on. R2 Figure 2. Application Circuit with CFF The RT2517A is designed specifically to work with low ESR ceramic output capacitor for space saving and performance consideration. Using a ceramic capacitor with capacitance range from 10μF to 47μF on the RT2517A output ensures stability. Input capacitance is selected to minimize transient input droop during load current steps. For general application, the requirement of input capacitor with a 10μF is recommended to minimize input impedance and provide the desired effect and do not affect stability. 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 Copyright © 2022 Richtek Technology Corporation. All rights reserved. DS2517A-03 April 2022 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT2517A 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. For recommended operating condition specifications, the maximum junction temperature is 125°C. The junction to ambient thermal resistance, θJA, is layout dependent. For VDFN-8AL 3x3 package, the thermal resistance, θJA, is 30.2°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) / (30.2°C/W) = 3.31W for VDFN-8AL 3x3 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 3 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Maximum Power Dissipation (W)1 3.5 Four-Layer PCB 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 3. Derating Curve of Maximum Power Dissipation Copyright © 2022 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 is a registered trademark of Richtek Technology Corporation. DS2517A-03 April 2022 RT2517A Outline Dimension 2 1 2 1 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 0.800 1.000 0.031 0.039 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.250 0.370 0.010 0.015 0.230 b1 0.009 D 2.900 3.100 0.114 0.122 D2 1.700 1.800 0.067 0.071 E 2.900 3.100 0.114 0.122 E2 1.450 1.550 0.057 0.061 e 0.650 0.026 e1 0.650 0.026 L 0.350 0.450 0.014 0.018 V-Type 8AL DFN 3x3 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. DS2517A-03 April 2022 www.richtek.com 11