RTQ2531A RICHTEK | Alldatasheet
Document overview
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Technical content
Features
⚫ Input Voltage Range : 1.7V to 5.5V ⚫ Output Voltage Range : 0.6V to 5.3V ⚫ Accurate Voltage Reference 0.6V 1.5%, Over −40C to 125C ⚫ Ultra High PSRR : 48dB at 500kHz ⚫ Excellent Noise Immunity : 25VRMS ⚫ Ultra Low Dropout Voltage : 150mV at 500mA ⚫ Enable Control ⚫ Short-Circuit Protection ⚫ Output-to-Input Reverse Current Protection ⚫ Support Power-OK Output Indicator Function ⚫ RoHS Compliant and Halogen Free
Applications
⚫ Portable Electronic Device ⚫ Optical Modules ⚫ Camera Modules ⚫ PLL/Synthesizer, Clocking Sensors ⚫ Medium-Current, Noise Sensitive Application Pin Configuration (TOP VIEW) VOUT BYP FB POK VIN GS GND EN GND WDFN-8SL 2x2 Simplified Application Circuit EN FB VOUT RTQ2531A GND VINVIN VOUT COUTCIN Enable Logic Supply CBYP R1 BYP GS POK POK
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 Marking Information 68 : Product Code W : Date Code 68W Functional Pin Description Pin No. Pin Name Pin Function 1 VIN Supply input. A 10F or larger ceramic capacitor is recommended for good noise bypass and should be placed as close as possible to this pin. 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 3 EN Enable control input. Connecting this pin to logic high enables the regulator, and driving this pin low puts it into shutdown mode. The device can have VIN and VEN sequenced in any order without causing damage to the device. 4 GS Internally Used. Connect GS to GND.
5 POK
Power-OK Output. Open -drain output that goes high when the output is above 91% of the nominal regulation voltage. The pin is pulled to ground when the output voltage is lower than its specified threshold, EN shutdown, OCP and OTP. 6 FB Feedback voltage input. This pin is used to set the desired output voltage via an external resistive divider. The feedback reference voltage is 0.6V typically. 7 BYP Bypass Input. Connecting a 0.01 F to this output further reduces output noise. Slew rate = (5V / ms) x (0.01F / CBYP).
8 VOUT
LDO output pin. A 4.7 F or larger ceramic capacitor (above 2 F effective capacitance) ensures the stability requirement. Place the output capacitor as close as possible to the device and minimize the impedance between the VOUT pin and the load.
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Functional Block Diagram GND FB VOUT 0.54V EN VIN BYP Reverse Current protection Charge Pump Bandgap AB Control Logic EA+ - Current Limit Thermal ProtectionUVLO POK Operation The RTQ2531A operates with single supply input ranging from 1.7V to 5.5V and is capable of delivering up to 500mA current to the output. The high PSRR and low noise features provides a clean supply to the application. A low-noise reference and error amplifier are inc luded to reduce device noise. The BYP capacitor filters the noise from the reference, and the feed -forward capacitor filters the noise from the error amplifier. The high power -supply rejection ratio (PSRR) of the RTQ2531A minimizes the coupling of input supply noise to the output. Enable The RTQ2531A provides an EN pin, as an external chip enable control, to enable or disable the device. Pull the EN pin low to turn -off the regulator and enters the shutdown mode, while pull the EN pin high to turn -on the reg ulator. When the regulator is shutdown, the ground current is reduced to a maximum of 1 A. The enable circuitry has hysteresis (typically 100mV) for use with relatively slowly ramping analog signals. If not used, connect the EN pin as close as possible to the largest capacitance on the input to prevent voltage droops on the VIN line from triggering the enable circuit. Bypass (BYP) The capacitor connected from VOUT to BYP filters the reference noise above the 100Hz range and provides a high-speed feedback p ath for improved transient response. The slew rate of the output voltage during startup is determined by the BYP capacitor. A 0.01 F capacitor sets the slew rate to 5V / ms. This startup rate results in a 50mA slew current drawn from the input at startup to charge the output capacitance. The BYP capacitor value can be adjusted from 4.7nF to 0.1F to change the startup slew rate according to the following formula : Startup slew rate = (5V / ms) x (0.01F / CBYP) Note that this slew rate applies only at startup, and that recovery from a short circuit occurs with a slew rate approximately 100 times slower. Also note that, being a low-frequency filter node, BYP is sensitive to leakage. Power OK The RTQ2531A monitors the feedback pin voltage and indicates the status of the output voltage on the open - drain POK pin. The POK pin requires an external pull - up resistor to an external supply, and any downstream
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 device can receive POK as a logic signal that can be used for sequencing. A pull -up resistor from 10k to 100k is recommended. Make sure that the external pull-up supply voltage results in a valid logic signal for the receiving device or devices. During startup, POK stays low until the output voltage rises to 91% (typical) of its regulation level. If an overload occurs at the output or the output is shutdown, POK goes low. Internal Current Limit (ILIM) The RTQ2531A continuously monitors the output current to protect the pass transis tor against abnormal operations. When an overload or short circuit is encountered, the current limit circuitry limits the output current to 0.7A (typical). Thermal shutdown can be activated during a current limit event because of the high power dissipatio n typically found in these conditions. To ensure proper operation of the current limit, minimize the inductances at the input and load. Continuous operation in current limit is not recommended. Because of the build -in body diode, the pass transistor conducts current when the output voltage exceeds the input voltage. Since the current is not limited, external current protection should be added if the device may work at reverse voltage state. Over-Temperature Protection (OTP) The RTQ2531A implements thermal shutdown protection. The device is disabled when the junction temperature (T J) exceeds 160 C (typical). The LDO automatically turns on again when the temperature falls below 140C (typical). For reliable operation, limit the junction temperature to a maximum of 125 C. Continuously running the RTQ2531A into thermal shutdown or above a junction temperature of 125C reduces long-term reliability. Output Active Discharge When EN and UVLO are lower than the respective threshold voltage during over -temperature protection, the RTQ2531A discharges the LDO output (via VOUT pins) through an internal current sink to ground. Do not rely on the active discharge circuit for discharging a large amount of output capacitance after the input supply collapses because reve rse current can possibly flow from the output to the input. External current protection should be added if the device work at reverse voltage state. Reverse Current Protection The reverse current protection circuit stops the reverse current from VOUT pin t o VIN pin when the output voltage is higher than the input. When VIN drops 10mV below VOUT, the RTQ2531A will shut off the regulator and open the PMOS body diode connection, preventing any reverse current.
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Absolute Maximum Ratings (Note 1) ESD Ratings (Note 2) ⚫ ESD Susceptibility Recommended Operating Conditions (Note 3) Thermal Information (Note 4 and Note 5) Thermal Parameter WDFN-8SL 2x2 Unit JA Junction-to-ambient thermal resistance (JEDEC standard) 52.2 C/W JC(Top) Junction-to-case (top) thermal resistance 160.1 C/W JC(Bottom) Junction-to-case (bottom) thermal resistance 23.1 C/W JA(EVB) Junction-to-ambient thermal resistance (specific EVB) 61.6 C/W JC(Top) Junction-to-top characterization parameter 5.61 C/W JB Junction-to-board characterization parameter 36.5 C/W
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022
Electrical Characteristics
Over operating temperature range (TJ = −40C to 125C), (1.7V VIN 5.5V and VIN VOUT(TARGET) + 0.5V, VOUT(TARGET) = 0.6V, VEN = VIN = 5V, CIN = 10F, COUT = 10F, CBYP = 0.01F, unless otherwise noted. (Note 6) Parameter Symbol Test Conditions Min Typ Max Unit Input Voltage Range VIN 1.7 -- 5.5 V Input Under Voltage Lockout VIN−UVLO VIN rising, 100mV typical hysteresis 1.45 1.6 1.7 V Output Voltage Range VOUT VIN VOUT + 0.1V 0.6 -- 5.3 V Output Voltage Accuracy 1.7V VIN 5.5V for VOUT 1.4 V, VOUT + 0.3V VIN 5.5V for VOUT > 1.4V, 0.1mA IOUT 500mA −1.5 -- 1.5 % Load Regulation VOUT/IOUT 0.1mA IOUT 500 mA -- 0.02 -- %/A Line Regulation VOUT/VIN 1.7V VIN 5.5V for VOUT 1.4V, VOUT + 0.3V VIN 5.5V for VOUT 1.4V, IOUT = 200mA -- 0.04 -- %/V Dropout Voltage VDO IOUT = 500mA VIN 3.6V, TA 85C -- 50 100 mV VIN 3.6V, TA 125C -- -- 120 Output Current Limit ILIM VOUT = 95% of regulation, VIN = VOUT + 0.5V 600 700 800 mA Output Noise VN IOUT = 100mA, f = 10Hz to 100kHz, VOUT = 0.6V, CBYP = 0.01F -- 25 -- VRMS Power Supply Rejection Ratio PSRR IOUT = 10mA f = 1kHz -- 60 -- dB f = 10kHz -- 55 -- Threshold Accuracy VFB Input Bias current VFB = 0.6V CBYP BYPASS CBYPASS 4.7 -- 100 nF BYP Startup Current From BYP to GND during startup -- 50 -- A GND Supply Current GND IOUT = 0mA TA = 85C -- 130 200 GND Shutdown Current VIN = 5.5V, EN = 0 V Enable Input Threshold Enable 1.7V VIN 5.5V EN rising -- 0.8 1.2 V EN falling, TA 85C 0.4 0.7 -- EN falling, TA 125C 0.38 0.7 --
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Unit Enable Input Bias Current 1.7V VEN 5.5V EN falling, TA = 25C −1 0.001 1 EN falling, TA = 85C -- 0.01 -- POK Threshold POK VOUT when POK switches VOUT rising 86 91 95 % VOUT falling -- 88 -- % POK Voltage Low IPOK = 1mA -- 10 100 mV Thermal Shutdown Threshold Thermal Shutdown TJ rising -- 165 -- TJ falling -- 150 -- Load Transient Output Transient IOUT = 50mA to 500mA to 50mA, tRISE = tFALL = 1s -- 50 -- mV/P−P Line Transient VIN = 5V to 5.5V to 5V, tRISE = tFALL = 5s, IOUT = 500mA -- 3 -- mV/P−P IN-to-OUT Reverse Voltage Turnoff Threshold VIN falling below VOUT -- 10 -- mV Note 1. Stresses beyond those listed under “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 m aximum rating conditions may affect device reliability. Note 2. Devices are ESD sensitive. Handling precautions are recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. For more information about thermal parameter, see the Application and Definition of Thermal Resistances report, AN061 Note 5. θJA(EVB), ΨJC(TOP) and ΨJB are measured on a high effective-thermal-conductivity four-layer test board which is in size of 70mm x 50mm; furthermore, all layers with 1 oz. Cu. Thermal resistance/parameter values may vary depending on the PCB material, layout, and test environmental conditions. Note 6. All devices are production tested at TA = 25°C. Specifications over the operating temperatu re range are guaranteed by design and characterization. Note 7. External resistor tolerance is not taken into account.
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 Typical Application Circuit EN FB VOUT RTQ2531A GND VINVIN VOUT COUT CIN Enable Logic Supply CBYP R1 BYP GS 10μF R3 100k 10μF0.01μF 267k 59k 3.3V / 500mA 2 (Exposed Pad) POK POK OUT REF R1 267kV = V 1 + = 0.6V 1 + = 3.3VR2 59k
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Typical Operating Characteristics Quiescent Current 100 150 200 250 Input Voltage (V) Input Current (μA) EN = HIGH, No Load Load Regulation 2.490 2.494 2.498 2.502 2.506 2.510 0 100 200 300 400 500 Output Current (mA) Output Voltage (V) VIN = 3.6V Line Regulation 2.490 2.494 2.498 2.502 2.506 2.510 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Output Voltage (V) IOUT = 200mA VIN = 3.6V, VOUT = 2.5V, IOUT = 50mA to 500mA COUT = 10F, CBYP = 10nF, tRISE = tFALL = 1sVOUT offset 2.5V (50mV/Div) IOUT (200mA/Div) Time (50s/Div) Load Transient Response VIN = 4V to 5V, VOUT = 2.5V, IOUT = 500mA COUT = 10F, CBYP = 10nF VIN offset 4V (500mV/Div) VOUT offset 2.5V (10mV/Div) Time (500s/Div) Line Transient Response VIN = 3.6V, VOUT = 2.5V, IOUT = 500mA COUT = 10F, CBYP = 10nF VEN (2V/Div) VOUT (1V/Div) IOUT (200mA/Div) Time (500s/Div) Power Up Response
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 Dropout Voltage vs. Input Voltage 100 120 140 160 Input Voltage (V) VIN-VOUT Dropout Voltage (mV) 125°C 85°C 25°C 0°C -40°C IOUT = 500mA Dropout Voltage vs. Output Current 100 120 140 160 Output Current (A) VIN-VOUT Dropout Voltage (mV) VIN = 1.7V 125°C 85°C 25°C 0°C -40°C Dropout Voltage vs. Output Current 100 Output Current (A) VIN-VOUT Dropout Voltage (mV) 125°C 85°C 25°C 0°C -40°C VIN = 5.5V PSRR vs. Frequency 100 10 100 1K 10K 100K 1M Frequency (Hz) Power-Supply Rejection Ratio (dB) VIN = 3.6V, VOUT = 2.5V, IOUT = 10mA COUT = 10F, CBYP = 10nF Output Noise vs. Frequency 0.001 0.01 0.1 10 100 1K 10K 100K 1M Frequency (Hz) Output Spectral Noise Density (μV/ Hz) VIN = 1.7V, VOUT = 0.6V, IOUT = 100mA COUT = 10F, CBYP = 10nF
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com 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 1.900 2.100 0.075 0.083 Option1 1.150 1.250 0.045 0.049 Option2 1.550 1.650 0.061 0.065 E 1.900 2.100 0.075 0.083 Option1 0.750 0.850 0.030 0.033 Option2 0.850 0.950 0.033 0.037 e 0.500 0.020 L 0.250 0.350 0.010 0.014 W-Type 8SL DFN 2x2 Package
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 Footprint Information Package Number of Pin Footprint Dimension (mm) Tolerance P A B C D Sx Sy M V/W/U/XDFN2*2-8S Option1 1.30 0.90 1.80 ±0.05 Option2 1.60 0.90
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Packing Information Tape and Reel Data Package Type Tape Size (W1) (mm) Pocket Pitch (P) (mm) Reel Size (A) Units per Reel Trailer (mm) Leader (mm) Reel Width (W2) Min./Max. (mm) (mm) (in) QFN/DFN 2x2 8 4 180 7 2,500 160 600 8.4/9.9 Tape Size W1 P B F ØJ H C, D and K are determined by component size. The clearance between the components and the cavity is as follows: - For 12mm carrier tape: 0.5mm max.
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DSQ2531A-01 October 2022 Tape and Reel Packing Step Photo / Description Step Photo / Description Reel 7” 3 reels per inner box Box A HIC & Desiccant (1 Unit) inside 12 inner boxes per outer box Caution label is on backside of Al bag Outer box Carton A Container Package Reel Box Carton Size Units Item Size(cm) Weight(Kg) Reels Units Item Size(cm) Boxes Unit QFN & DFN 2x2 7” 2,500
Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2531A-01 October 2022 www.richtek.com Packing Material Anti-ESD Property 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 witho ut 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 oth er 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. Surface Resistance Aluminum Bag Reel Cover tape Carrier tape Tube Protection Band /cm2 104 ~ 1011 104 ~ 1011 104 ~ 1011 104 ~ 1011 104 ~ 1011 104 ~ 1011