RTQ2522A/RTQ2522B - 2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start | Richtek Technology
® RTQ2522A/B 2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start General Description The RTQ2522A/B is a very low dropout linear regulator which operates from input voltage as low as 0.8V. The device is capable of supplying 2A of output current with a typical dropout voltage of only 90mV. A VBIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the VIN supply for high efficiency regulation. User-programmable soft-start limits the input inrush current and minimizes stress on the input power. The enable input and power good output allow easy sequencing with external regulators. This complete flexibility provides an easy-to-use robust power management solution for a wide variety of applications. The RTQ2522A/B is stable with output capacitor greater than or equal to 2.2F. A precise reference and error amplifier deliver 2% accuracy over load, line and temperature. Over-current limit and over-temperature protection are also included. The RTQ2522A/B is available in the WDFN-10L 3x3 and WQFN-20L 5x5 packages. Applications PCs, Servers, Modems, and Set-Top-Boxes FPGAApplications DSP Core and I/O Voltages Instrumentation Post-Regulation Applications Applications With Sequencing Requirements Features Ultralow VIN Range : 0.8V to 5.5V VBIAS Voltage Range : 2.7V to 5.5V VOUT Voltage Range : 0.8V to 3.6V Low Dropout : 90mV Typ at 2A, VBIAS = 5V 2% Accuracy Over Line/Load/ Temperature PGOOD Indicator for Easy Sequence Control Programmable Soft-Start Provides Linear Voltage Startup Stable with Any Output Capacitor 2.2F Over-Current and Over-Temperature Protection Ordering Information RTQ2522A/B Pin 1 Orientation*** (2) : Quadrant 2, Follow EIA-481-D Package Type QW : WDFN-10L 3x3 (W-Type) QW : WQFN-20L 5x5 (W-Type) Lead Plating System G: Richtek Green Policy Compliant A : WDFN-10L 3x3 B : WQFN-20L 5x5 Note : ***Empty means Pin1 orientation is Quadrant 1 Richtek products are Richtek Green Policy compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Simplified Application Circuit VIN VBIAS CIN CBIAS CSS RTQ2522A/B VIN PGOOD EN VBIAS VOUT SS FB GND RPGOOD R1 VOUT COUT R2 Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RTQ2522A/B Pin Configuration VIN 1 VIN 2 PGOOD 3 VBIAS 4 EN 5 GND 10 VOUT 9 VOUT 8 FB 7 SS 11 6 GND (TOP VIEW) VOUT VOUT VOUT NC FB VOUT 1 NC 2 NC 3 NC 4 VIN 5 20 19 18 17 16 15 SS 14 NC GND 13 NC 12 GND 21 11 EN 6 7 8 9 10 VIN VIN VIN PGOOD VBIAS WDFN-10L 3x3 Marking Information RTQ2522AGQW KK=YM DNN KK= : Product Code YMDNN : Date Code WQFN-20L 5x5 RTQ2522BGQW RTQ2522B GQW YMDNN RTQ2522BGQW : Product Number YMDNN : Date Code Functional Pin Description Pin No. WDFN-10L 3x3 WQFN-20L 5x5 1, 2 5, 6, 7, 8 Pin Name VIN 9, 10 1, 18, 19, 20 VOUT 3 9 PGOOD 4 10 VBIAS 5 11 EN 6, 11 (Exposed Pad) 12, 21 (Exposed Pad) GND 7 15 SS Pin Function Power input of the device. Regulated output voltage. A minimum of 2.2F capacitor should be placed directly at this pin. Power good indicator. An open-drain, active-high output that indicates the status of VOUT. A pull-up resistor from 10k to 1M should be connected from this pin to a supply of up to 5.5V. Bias input pin. Providing input voltage for internal control circuitry. Chip enable (Active-High). Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of its operating value. Connect to VIN if not being used. Ground. The Exposed Pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Connect a capacitor between this pin and the ground to set the soft-start ramp time of the output voltage. Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 RTQ2522A/B Pin No. Pin Name WDFN-10L 3x3 WQFN-20L 5x5 8 16 FB -- 2, 3, 4, 13, 14, 17 NC Pin Function Feedback pin. Connect this pin to an external voltage divider to set the output voltage. No internal connection. This pin can be left floating or connected to GND. Functional Block Diagram VIN VBIAS SS EN Current Limit UVLO Soft-Start Discharge + + - 0.8V Reference Thermal Protection Hysteresis and Deglitch 0.9 x VREF + VOUT FB PGOOD GND Operation The RTQ2522A/B is a very low dropout linear regulator which operates from input voltage as low as 0.8V. It provides a highly accurate output that is capable of supplying 2A of output current with a typical dropout voltage of only 90mV. Output voltage range is from 0.8V to 3.6V. VIN and VBIAS Supply The VBIAS input supplies the internal reference and LDO circuitry while all output current comes directly from the VIN input for high efficiency regulation. With external VBIAS 3.25V above VOUT, offers the RTQ2522A/B very low dropout performance (140mV Max. at 2A) which allows the device to be used in place of a DC-DC converter and still achieve good efficiency. This provides designers to achieve the smallest, simplest, and lowest cost solution. For applications where an auxiliary bias voltage is not Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 available or low dropout is not required. In these applications, VBIAS is suggested be 1.8V above VOUT and attention on power rating and thermal is needed. Enable and Shutdown The EN pin is active high. Apply a voltage above 1.1V ensures the LDO regulator turns on, while the regulator turns off if the VEN belows 0.4V. The enable circuitry has typical 50mV hysteresis and deglitching for use with relatively slowly ramping analog signals. That helps avoid on-off cycling as a result of small glitches in the VEN signal. A fast rise-time signal must be used to enable the RTQ2522A/B if precise turn-on timing is required. If not used, EN can be connected to either VIN or VBIAS. If EN is connected to VIN, it should be connected as close as possible to the largest capacitance on the input to prevent voltage droops on that line from triggering the enable circuit. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RTQ2522A/B Soft-Start The RTQ2522A/B includes a soft-start feature to prevent excessive current flow during start-up. When the LDO is enabled, an internal soft-start current (ISS) charges the external soft-start capacitor (CSS) to build a ramp-up voltage internally. The RTQ2522A/B achieve a linear and monotonic soft-start by tracking the voltage ramp until the voltage exceeds the internal reference. The soft-start ramp time can be calculated using Equation 1 : tSS(s) = VREF CSS ISS = 0.8V CSS(F) 0.44 A (1) Power GOOD When the output voltage is greater than VIT + VHYS, the output voltage is considered good and the open-drain PGOOD pin goes high impedance and is typically pulled high with external resistor. If VOUT drops below VIT or if VBIAS drops below 1.9 V, the open-drain output turns on and pulls the PGOOD output low. The PGOOD pin also asserts when the device is disabled, OCP or OTP triggered. Over-Current Protection The RTQ2522A/B has built-in over-current protection. When over current (typ. 3A) is detected, the RTQ2522A/ B foldback and limit the current at typical 2.25A. It allows the device to supply surges of up to 3A and prevent the device over-heating if short circuit happened. Thermal Protection At higher temperatures, or in cases where internal power dissipation causes excessive self heating on chip, the thermal shutdown circuitry will shut down the LDO when the junction temperature exceeds approximately 160°C. It will re enable the LDO once the junction temperature drops back to approximately 140°C. The RTQ2522A/B will cycle in and out of thermal shutdown without latch-up or damage until the overstress condition is removed. Long term overstress (TJ > 125°C) should be avoided as it can degrade the performance or shorten the life of the part. Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 RTQ2522A/B Absolute Maximum Ratings (Note 1) Supply Input Voltage, VIN --------------------------------------------------------------------------------------- -0.3V to 6V Other Pins ---------------------------------------------------------------------------------------------------------- -0.3V to 6V Output Voltage, VOUT ------------------------------------------------------------------------------------------- -0.3V to (VIN + 0.3V) Power Dissipation, PD @ TA = 25°C WDFN-10L 3x3 ---------------------------------------------------------------------------------------------------- 3.27W WQFN-20L 5x5 ---------------------------------------------------------------------------------------------------- 3.54W Package Thermal Resistance (Note 2) WDFN-10L 3x3, JA ----------------------------------------------------------------------------------------------- 30.5°C/W WDFN-10L 3x3, JC ---------------------------------------------------------------------------------------------- 7.5°C/W WQFN-20L 5x5, JA ---------------------------------------------------------------------------------------------- 28.2°C/W WQFN-20L 5x5, JC ---------------------------------------------------------------------------------------------- 7.1°C/W Junction Temperature -------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------ -65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Model) ------------------------------------------------------------------------------------- 2kV Recommended Operating Conditions (Note 4) Supply Input Voltage --------------------------------------------------------------------------------------------- 0.8V to 5.5V Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 105°C Electrical Characteristics (VEN = 1.1V, VIN = VOUT + 0.3V, VBIAS = 5V, CBIAS = 0.1F, CIN = COUT = 10F, CSS = 1nF, IOUT = 50mA, TA = -40°C to 105°C, unless otherwise specified. Typical values are at TA = 25°C) Parameter Symbol Test Conditions Min Typ Max Unit Input Voltage VBIAS Pin Voltage VIN VBIAS VOUT + VDROP -- 5.5 V 2.7 -- 5.5 V Internal Reference VREF TA = 25C 0.796 0.8 0.804 V Output Voltage Range Accuracy Line Regulation VOUT VLINE VIN = 5V, IOUT = 2A VREF -- 3.6 V 2.97V VBIAS 5.5V, 50mA IOUT 2A 2 0.5 2 % VOUT (Normal) + 0.3 VIN 5.5V -- 0.03 -- %/V Load Regulation VIN Dropout Voltage VBIAS Dropout Voltage VLOAD 50mA IOUT = 2A VDROP_VIN IOUT = 2A, VBIAS VOUT (Normal) 3.25V VDROP_VBIAS IOUT = 2A, VIN = VBIAS -- 0.09 %/A -- 90 140 mV -- 1.55 1.8 V Current Limit ILIM VOUT = 80% × VOUT (Normal) 2.5 -- 5.5 A Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RTQ2522A/B Parameter Symbol Bias Pin Current IBIAS Shutdown Supply Current (IGND) ISHDN Feedback Pin Current IFB Power-Supply Rejection (VIN to VOUT) Power-Supply Rejection (VBIAS to VOUT) PSRR (Note 5) Output Noise Voltage Minimum Startup Time Soft-Start Charging Current Enable Input Voltage Logic_High Logic_Low Enable Pin Hysteresis Enable Pin Deglitch Time Enable Pin Current PGOOD Trip Threshold PGOOD Trip Hysteresis PGOOD Output Low Voltage PGOOD Leakage Current Noise (Note 5) tSTR (Note 5) ISS VIH VIL VEN_HYS VEN_DG IEN VIT VHYS VPGOOD_ L IPGOOD_LK Thermal Shutdown Temperature TSD Test Conditions VEN = 0.4V 1kHz, IOUT = 1.5A, VIN = 1.8V, VOUT = 1.5V 300kHz, IOUT = 1.5A, VIN = 1.8V, VOUT = 1.5V 1kHz, IOUT = 1.5A, VIN = 1.8V, VOUT = 1.5V 300kHz, IOUT = 1.5A, VIN = 1.8V, VOUT = 1.5V 100Hz to 100kHz, IOUT = 1.5A, CSS = 0.001F RLOAD for IOUT = 1A, CSS = open VSS = 0.4V VEN = 5V VOUT decreasing IPGOOD = 1mA (sinking), VOUT < VIT VPGOOD = 5.25 V, VOUT > VIT Shutdown, temperature increasing Reset, temperature decreasing Min Typ Max Unit -- 1 2 mA -- 1 50 A 1 0.15 1 A -- 60 -- dB -- 30 -- -- 50 -- dB -- 30 -- -- 25 x VOUT -- VRMS -- 200 -- s -- 440 -- nA 1.1 -- 5.5 V 0 -- 0.4 -- 50 -- mV -- 20 -- s -- 0.1 1 A 85 90 94 %VOUT -- 3 -- %VOUT -- -- 0.3 V -- 0.1 1 A -- 165 -C -- 140 -- 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 maximum rating conditions may affect device reliability. Note 2. JA is measured under natural convection (still air) at TA = 25°C with the component mounted on a high effectivethermal-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. Guaranteed by design. Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 Typical Application Circuit RTQ2522A/B VIN VBIAS RTQ2522A 1, 2 VIN PGOOD 3 CIN CBIAS CSS 5 EN 4 VBIAS 7 SS VOUT 9, 10 CFF *Option FB 8 GND RPGOOD R1 R2 6, 11 (Exposed Pad) VOUT COUT VIN VBIAS RTQ2522B 5, 6, 7, 8 VIN PGOOD 9 CIN 11 EN 10 VBIAS CBIAS 15 SS VOUT 1, 18, 19, 20 *OpCtiFoFn FB 16 CSS GND 12, 21 (Exposed Pad) RPGOOD R1 R2 COUT VOUT * : The feedforward capacitor is optional for the transient response and circuit stability improvement. Table 1. Suggested Component Value VOUT (V) 0.8 R1 (k) Short R2 (k) Open 0.9 0.619 4.99 1.0 1.13 4.53 1.05 1.37 4.42 1.1 1.87 4.99 1.2 2.49 4.99 1.5 4.12 4.75 1.8 3.57 2.87 2.5 3.57 1.69 3.3 3.57 1.15 Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RTQ2522A/B Typical Operating Characteristics VBIAS Voltage (V) VBIAS Voltage UVLO vs. Temperature 2.31 2.29 Logic_High 2.27 2.25 2.23 2.21 2.19 2.17 logic_Low 2.15 2.13 2.11 VIN = 1.8V, VOUT = 1.2V, VBIAS = 5V, IOUT = 50mA -50 -25 0 25 50 75 100 125 Temperature (°C) Reference Voltage vs. Temperature 0.810 Reference Voltage (V) 0.805 0.800 0.795 0.790 -50 -25 VIN = 1.8V, no load 0 25 50 75 Temperature (°C) 100 125 VIN Dropout Voltage vs. (VBIAS - VOUT) 350 300 250 200 105°C 25°C 150 -40°C 100 50 VIN = 1.5V, IOUT = 2A 0 1 1.5 2 2.5 3 3.5 4 4.5 5 VBIAS - VOUT (V) VIN - VOUT (mV) Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 Output Spectral Noise Density (V /Hz)1 Enable Voltage Threshold (V)1 (VIN - VOUT) Dropout Voltage (mV) Enable Voltage Threshold vs. Temperature 0.90 0.85 Logic_High 0.80 0.75 logic_Low 0.70 0.65 0.60 0.55 VIN = 1.8V, VOUT = 1.2V, VBIAS = 5V, IOUT = 50mA 0.50 -50 -25 0 25 50 75 100 125 Temperature (°C) Dropout Voltage vs. Output Current 140 120 100 105°C 25°C 80 -40°C 60 40 20 0 0 VIN = 1.5V, VBIAS = 5V 500 1000 1500 Output Current (mA) 2000 Output Spectral Noise Density 100 10 1 0.1 0.01 0.001 VIN = 1.5V, VOUT = 1.2V, COUT = 10F, ILOAD = 1.5A 10 100 1000 10000 100000 Frequency (Hz) is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 RTQ2522A/B PSRR (dB) PSRR (dB) VIN PSRR vs. Frequency 90 80 70 60 50 40 ILOAD = 0.1A 30 ILOAD = 1.5A 20 10 0 10 VIN = 1.8V, VOUT = 1.2V, COUT = 10F, CSS = 1nF 100 1K 10K 100K 1M 10M Frequency (Hz) 100 90 80 70 60 50 40 30 20 10 0 10 VBIAS PSRR vs. Frequency ILOAD = 0.1A ILOAD = 0.5A ILOAD = 1.5A VIN = 1.8V, VOUT = 1.2V, VBIAS = 5V, COUT = 10F, CSS = 1nF 100 1K 10K 100K 1M 10M Frequency (Hz) Power Up Response CSS = 0nF VOUT (500mV/Div) CSS = 2.2nF CSS = 1nF Load Transient Response VOUT (50mV/Div) EN (2V/Div) Time (1ms/Div) IOUT (1A/Div) VIN = 2.5V, VOUT = 1.5V, IOUT = 100mA to 1.5A Time (50s/Div) Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RTQ2522A/B Application Information Richtek's component specification does not include the following information in the Application Information section. Thereby no warranty is given regarding its validity and accuracy. Customers should take responsibility to verify their own designs and reserve suitable design margin to ensure the functional suitability of their components and systems. The RTQ2522A/B is a low dropout regulator that features soft-start capability. It provides EN and PGOOD for easily system sequence control, and built-in over current & thermal protection for safe operation. Dropout Voltage Because of two power supply inputs VIN and VBIAS and one VOUT regulator output, there are two Dropout voltages specified. The first is the VIN Dropout voltage is the voltage difference (VIN - VOUT) when VOUT starts to decrease by percent specified in the Electrical Characteristics table. The second, VBIAS dropout voltage is the voltage difference (VBIAS - VOUT) when VIN and VBIAS pins are joined together and VOUT starts to decrease. This option allows the device to be used in applications where an auxiliary bias voltage is not available or low dropout is not required. In these applications, VBIAS is suggested be 1.8V above VOUT and attention on power rating and thermal is needed. Input, Output, and Bias Capacitor Selection The device is designed to be stable for all available types and values of output capacitors 2.2F. The device is also stable with multiple capacitors in parallel, which can be of any type or value. The capacitance required on the VIN and VBIAS pins strongly depends on the input supply source impedance. To counteract any inductance in the input, the minimum recommended capacitor for VIN is 1F and minimum recommended capacitor for VBIAS is 0.1F. If VIN and VBIAS are connected to the same supply, the recommended minimum capacitor for VBIAS is 4.7F. Good quality, low ESR capacitors should be used on the input; ceramic X5R and X7R capacitors are preferred. These capacitors should be placed as close the pins as possible for optimum performance. Adjusting the Output Voltage The output voltage of the RTQ2522A/B is adjustable from 0.8V to 3.6V by external voltage divider resisters as shown Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 in Typical Application Circuit. R1 and R2 can be calculated the output voltage. In order to achieve the maximum accuracy specifications, R2 should be 4.99k. Power Up Sequence Requirement The RTQ2522A/B supports power on the input VIN, VBIAS, and EN pins in any order without damage the device. Generally, connecting the EN and VIN for most application is acceptable, as long as VIN and VEN is greater than the EN threshold (typ. = 1.1V) and the input ramp rate of VIN and VBIAS is faster than the output settled soft-start ramp rate. If the VIN/BIAS input source ramp rate is slower than the output settled soft-start time, the output will track the input supply ramp up level and minus the dropout voltage until it reaches the settled output voltage level. For the other case, If EN is connected with VBIAS, and the provided VIN is present before VBIAS, the output soft-start will as programmed. While VBIAS and VEN are present before VIN is applied also the settled soft-start time has expired, then VOUT tracks VIN ramp up. If the soft-start time has not expired, output tracks VIN ramp up until output reaches the value set by the charging softstart capacitor. 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. is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 For continuous operation, the maximum operating junction temperature indicated under Recommended Operating Conditions is 125°C. The junction-to-ambient thermal resistance, JA, is highly package dependent. For a WDFN-10L 3x3 package, the thermal resistance, JA, is 30.5°C/W on a standard JEDEC 51-7 high effective-thermalconductivity four-layer test board. For a WQFN-20L 5x5 package, the thermal resistance, JA, is 28.2°C/W on a standard JEDEC 51-7 high effective-thermal-conductivity four-layer test board. The maximum power dissipation at TA = 25°C can be calculated as below : PD(MAX) = (125°C - 25°C) / (30.5°C/W) = 3.27W for a WDFN-10L 3x3 package. PD(MAX) = (125°C - 25°C) / (28.2°C/W) = 3.54W for a WQFN-20L 5x5 package. The maximum power dissipation depends on the operating ambient temperature for the fixed TJ(MAX) and the thermal resistance, JA. The derating curves in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Maximum Power Dissipation (W)1 4.0 WQFN-20L 5x5 3.5 Four-Layer PCB 3.0 2.5 WDFN-10L 3x3 2.0 1.5 1.0 0.5 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curve of Maximum Power Dissipation RTQ2522A/B Layout Considerations For best performance of the RTQ2522A/B, the PCB layout suggestions below are highly recommend : Input capacitor must be placed as close as possible to IC to minimize the power loop area. Minimize the power trace length and avoid using vias for the input and output capacitors connection. Figure 2 and Figure 3 shows the examples for the layout reference which helps the inductive parasitic components minimization, load transient reduction and good circuit stability. Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RTQ2522A/B GND layout trace should be wider for thermal consideration. GND Plane VOUT Plane VIN Plane PGOOD reference source input Enable signal input CIN COUT VIN 1 VIN 2 PGOOD 3 10 VOUT 9 VOUT R1 8 FB VBIAS 4 11 7 SS EN 5 6 GND R2 CBIAS CSS Add via for thermal consideration GND Plane Figure 2. RTQ2522A PCB Layout Guide VIN Plane GND Plane VIN NC NC NC VOUT CIN 5 4321 VOUT Plane PGOOD reference VIN 6 source input VIN 7 20 VOUT 19 VOUT VIN 8 PGOOD 9 18 VOUT 17 NC R1 VBIAS 10 21 GND 16 FB R2 CBIAS 11 12 13 14 15 COUT EN GND NC NC SS Enable signal input CSS GND Plane Add via for thermal consideration Figure 3. RTQ2522B PCB Layout Guide Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 Outline Dimension RTQ2522A/B D2 D L E E2 SEE DETAIL A 1 e b A A3 A1 21 21 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 A A1 A3 b D D2 E E2 e L Dimensions In Millimeters Min Max 0.700 0.800 0.000 0.050 0.175 0.250 0.180 0.300 2.950 3.050 2.300 2.650 2.950 3.050 1.500 1.750 0.500 0.350 0.450 Dimensions In Inches Min Max 0.028 0.031 0.000 0.002 0.007 0.010 0.007 0.012 0.116 0.120 0.091 0.104 0.116 0.120 0.059 0.069 0.020 0.014 0.018 W-Type 10L DFN 3x3 Package Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RTQ2522A/B Symbol A A1 A3 b D D2 E E2 e L 1 1 2 2 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. Dimensions In Millimeters Min. Max. 0.700 0.800 0.000 0.050 0.175 0.250 0.250 0.350 4.900 5.100 3.100 3.200 4.900 5.100 3.100 3.200 0.650 0.500 0.600 Dimensions In Inches Min. Max. 0.028 0.031 0.000 0.002 0.007 0.010 0.010 0.014 0.193 0.201 0.122 0.126 0.193 0.201 0.122 0.126 0.026 0.020 0.024 W-Type 20L QFN 5x5 Package Copyright ©2023 Richtek Technology Corporation. All rights reserved. www.richtek.com 14 is a registered trademark of Richtek Technology Corporation. DSQ2522A/B-04 August 2023 Footprint Information RTQ2522A/B Package Number of Pin P A Footprint Dimension (mm) Tolerance B C D Sx Sy M V/W/U/X/ZDFN3*3-10 10 0.50 3.80 2.10 0.85 0.30 2.55 1.70 2.30 ±0.05 Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 15 RTQ2522A/B Package Number of Pin P Footprint Dimension (mm) Ax Ay Bx By C D Tolerance Sx Sy V/W/U/XQFN5*5-20 20 0.65 5.80 5.80 3.80 3.80 1.00 0.40 3.25 3.25 ±0.05 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. 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 16 DSQ2522A/B-04 August 2023 RTQ2522A/B Datasheet Revision History Version Date Description 04 2023/8/7 Modify Item General Description on P1 Features on P1 Ordering Information on P1 Operation on P3 Electrical Characteristics on P5 Application Information on P10 Copyright ©2023 Richtek Technology Corporation. All rights reserved. DSQ2522A/B-04 August 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 17Acrobat Distiller 9.0.0 (Windows)