RT6158AWSC

® RT6158A High Efficiency, Low Quiescent, 2A Buck-Boost Converter General Description Features The RT6158A converter is a high efficiency single inductor converter which can operate with wide input voltage 2.5V to 5V such as battery which is higher or lower than the output voltage and it can supply the load current up to 2A. The maximum peak current in the switches is limited to a typical value of 4.5A. Feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The Buck-Boost operates at 2MHz typical switching frequency in full synchronous operation.  Input Voltage Range : 2.5V to 5V  Adjustable Output Voltage : 2.1V to 5.2V by External Divided Resistors Up to 2A Maximum Load Capability for VIN = 3V, VOUT = 3.5V Up to 96% Efficiency (VIN = 4.2V, VOUT = 3.5V, ILOAD = 0.5A) OCP, OVP, OTP, UVLO and SCP Function 2MHz Switching Frequency 5μ μA Non-Switching Low Quiescent Current Forced PWM and Automatic PFM/PWM Mode Selection Output Fast Discharge Function Automatic / Seamless Step Up and Step Down Mode Transitions 25-Ball WL-CSP Package       The RT6158A operates in Pulse Frequency Modulation (PFM) mode for increasing efficiency. The PFM mode can be disabled, forcing the RT6158A to operate at a fixed switching frequency operation at 2MHz. The RT6158A can also be synchronized with external frequency at MODE pin from 2.2MHz to 2.6MHz. The RT6158A output voltage is programmable using an external resistor divider; the output voltage range is from 2.1V to 5.2V.    Ordering Information RT6158A Package Type WSC : WL-CSP-25B 2.07x2.33 (BSC) Applications     Note : Cellular Telephones Wifi Module Tablet PC Portable Instrument Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit L1 LX1 VIN LX2 PVIN RT6158A CIN VOUT VOUT R1 AVIN CFF COUT FB EN R2 MODE AGND Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 PGND is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT6158A Marking Information Pin Configuration 0M : Product Code 0M YM DNN (TOP VIEW) YMDNN : Date Code A1 PVIN A2 PVIN B1 B2 A3 A4 A5 PVIN PVIN AVIN B3 B4 B5 LX1 LX1 LX1 LX1 EN C1 C2 C3 C4 C5 PGND PGND PGND MODE AGND D1 LX2 D2 LX2 E1 E2 VOUT VOUT D3 D4 D5 LX2 LX2 AGND E3 E4 E5 VOUT VOUT FB WL-CSP-25B 2.07x2.33 (BSC) Functional Pin Description Pin No. Pin Name Pin Function A1, A2, A3, A4 PVIN Power input supply. The input voltage range is from 2.5V to 5V after soft-start is finished. Connect input capacitors between this pin and PGND with a wide PCB trace. A5 AVIN Analog input supply. AVIN Connect to PVIN. B1, B2, B3, B4 LX1 Switching node 1. Connect to inductor. B5 EN Chip enable. This input must not be left floating and must be terminated. C1, C2, C3 PGND Power ground. Connect to this pin with the shortest path for power transmission to reduce parasitic component effect. C4 MODE High for PFM mode, low for FCCM mode. This pin also can be used to synchronize switching frequency with 2.2MHz to 2.6MHz. This input must not be left floating and must be terminated. C5, D5 AGND Analog ground. This is the signal reference ground for the IC. D1, D2, D3, D4 LX2 Switching node 2. Connect to inductor. E1, E2, E3, E4 VOUT Output voltage pin. PCB trace length from VOUT to the output filter capacitor should be as short and wide as possible. FB Output voltage feedback. The typical value of the voltage at the FB pin is 800mV. E5 Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A Functional Block Diagram LX2 LX1 A PVIN D Power MOS Gate Driver UVLO AVIN B VOUT Rd C DIS OCP EN PWM Control Digital Control DIS MODE AMP + OSC OVP OTP SCP FB AGND VREF PGND Operation The RT6158A is a synchronous current mode constant on/off time (CMCOT) switching Buck-Boost converter designed to an adjustable output voltage with an input supply that can be above, equal, or under the output voltage. The inductor current is regulated by a fast current regulator which is controlled by a voltage control loop. The voltage error amplifier gets its feedback input from the FB pin. The output voltage of the RT6158A is Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 adjustable, and can be set by the external divided resistor. When VIN is greater than VOUT, the device operates in Buck mode. When VIN is lower than VOUT, the device operates in Boost mode. When VIN is close to VOUT, the RT6158A automatically enters Buck or Boost mode. In that case, the converter will maintain the regulation for output voltage and keep a minimum current ripple in the inductor to guarantee good performance. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT6158A Absolute Maximum Ratings           (Note 1) Input Voltage, PVIN, AVIN ----------------------------------------------------------------------------------------------Output Voltage, VOUT --------------------------------------------------------------------------------------------------Switch Node Voltage, LX1, LX2 ---------------------------------------------------------------------------------------< 20ns -----------------------------------------------------------------------------------------------------------------------Other I/O Pins Voltage (EN, MODE, FB) ---------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WL-CSP-25B 2.07x2.33 (BSC) ---------------------------------------------------------------------------------------- 2.8W Package Thermal Resistance (Note 2) WL-CSP-25B 2.07x2.33 (BSC), θJA ----------------------------------------------------------------------------------- 35.7°C/W Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV Recommended Operating Conditions      −0.3V to 6V −0.3V to 6V −0.3V to 6V −3V to 8.5V −0.3V to 6V (Note 4) Input Voltage, PVIN, AVIN ----------------------------------------------------------------------------------------------Output Voltage, VOUT --------------------------------------------------------------------------------------------------Output Current, IOUT ----------------------------------------------------------------------------------------------------Junction Temperature Range -------------------------------------------------------------------------------------------Ambient Temperature Range -------------------------------------------------------------------------------------------- 2.5V to 5V 2.1V to 5.2V 0A to 2A −40°C to 125°C −40°C to 85°C Electrical Characteristics (VIN = 3.6V, VOUT = 3.5V, CIN = 10μF x 2, COUT = 10μF x 4, L = 1μH, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions PVIN and AVIN Min Typ Max Unit 2.5 -- 5 V Input Voltage Range VIN Logic Input High Threshold VIH 1.2 -- -- V Logic Input Low Threshold VIL -- -- 0.4 V Under-Voltage Lockout VUVLO 2.05 2.15 2.25 V Under-Voltage Lockout Hysteresis VUVLO_H 0.02 0.1 0.25 V Shutdown Current ISHDN VIN = 3.5V, EN = L -- -- 1 A Input Quiescent Current IQVIN Non-switching. VIN = 4.2V, VOUT = 3.5V, EN = VIN, Mode = VIN 2 5 8 A Switching Quiescent Current IQSW ILOAD = 0A. VIN = 4.2V, VOUT = 3.5V, EN = VIN, Mode = VIN 5 8 11 A Switching Frequency f SWCOT MODE = H, |VIN - VOUT| > 1V 1 2 2.6 MHz Switching Frequency f SWCCM MODE = L 1.3 2 2.8 MHz Synchronous Switching Frequency Range f SWSYNC MODE = square wave, 10% < duty < 90% 2.2 -- 2.6 MHz Rising   Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A Parameter Soft-Start Time Symbol Test Conditions Min Typ Max tSS_EN Time from EN goes H to 90% VOUT starts ramp up 0.3 1 2 tSS VIN = 4V, VOUT = 3.5V, ILOAD = 200mA 0.3 1 2 tSS VIN = 2.5V, VOUT = 3.5V, ILOAD = 200mA 0.6 2 4 Unit ms Minimum off Time tOFF_MIN 15 40 65 ns Minimum on Time tON_MIN 25 40 80 ns 0.792 0.8 0.808 V FB Voltage CCM operation High Side Switch OnResistance RDS_ON_A, D VOUT = 5V 12 20 30 m Low Side Switch OnResistance RDS_ON_B, C VOUT = 5V 12 20 30 m Output Over-Voltage Protection VOVP 5.3 5.6 5.9 V Load Current Threshold, PFM ITH_PWM to PWM VIN = 3.6V, VOUT = 3.3V -- 200 -- mA Load Current Threshold, PWM to PFM ITH_PFM VIN = 3.6V, VOUT = 3.3V -- 200 -- mA FAULT Time tFAULT 15 40 70 ms Thermal Shutdown TOTP (Note 5) -- 160 -- °C Over-Temperature Protection Hysteresis TOTP_HYS (Note 5) -- 20 -- °C Inductor Peak Current Limit ICL 4.3 4.5 5 A Line Regulation VIN = 2.5V to 5V, VOUT = 3.5V, CCM, ILOAD = 1.5A 2 0.6 2 % Load Regulation VIN = 2.5V to 5V, VOUT = 3.5V, CCM operation, ILOAD < 2A 2 0.6 2 % VIN = 3V to 3.6V at 10s, VOUT = 3.5V, ILOAD = 1A -- 100 200 mV VIN = 3.4V, VOUT = 3.5V, ILOAD = 0.5A to 1A at 1s -- 250 400 mV Line Transient VOUTp-to-p Load Transient 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. θJA 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. 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. TOTP and TOTP_HYS are guaranteed by design. Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT6158A Typical Application Circuit L1 1µH B1, B2, B3, B4 D1, D2, D3, D4 LX1 LX2 A1, A2, A3, A4 PVIN RT6158A CIN E1, E2, E3, E4 VOUT 10µF x 2 VIN 2.5V to 5V A5 R1 1M AVIN B5 EN FB CFF 56pF E5 REN 100k COUT 10µF x 4 R2 294k C4 Pull high voltage (For PFM operation) VOUT 2.1V to 5.2V MODE AGND C5, D5 PGND C1, C2, C3 Below are recommended components information Reference Part Number Description Package Manufacturer CIN GRJ155R60J106ME11D 10F/6.3V/X5R 0402 MuRata COUT GRJ155R60J106ME11D 10F/6.3V/X5R 0402 MuRata CFF GRM0335C1H560JA01D 56pF/50V/NPO 0201 MuRata L1 DFE252010F-1R0M = P02 1H, ±20% 2.5x2x1mm MuRata R1 100k CFF Application Condition 560pF to 680pF Load Transient Performance for wifi application requirement (Load condition 50mA to 450mA with slew rate 400mA/s) Load = 0A to 2A, the system stability 56pF to 680pF Load = 0A to 2A, the system stability Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A Typical Operation Characteristics Efficiency Load Regulation 100 3.0 2.5 VIN = 3.5V 4.2V 2.0 VIN = 4.2V Regulation (%) Efficiency (%) 85 VIN = 3.8V 70 VIN = 3V 55 3.8V 1.5 1.0 3.5V 0.5 0.0 40 0.00001 0.0001 3V -0.5 VOUT = 3.5V VOUT = 3.5V -1.0 0.001 0.01 0.1 1 10 1 10 100 1000 Load Current (A) Output Current (mA) Line Regulation VOUT Ripple Voltage 3.64V 10000 VIN = 3V, VOUT = 3.5V, IOUT = 0A to 2A VOUT (50mV/Div) OutputVoltage(V) 3.60V 0A 3.56V 0.5A 0.1A LX1 (5V/Div) LX2 (5V/Div) 3.52V 2A 3.48V 3.0 3.5 4.0 4.5 LX2 IOUT IOUT (500mA/Div) VOUT = 3.5V 2.5 LX1 5.0 Time (5ms/Div) Input Voltage(V) VOUT Ripple Voltage Load Transient VIN = 4.5V, VOUT = 3.5V, IOUT = 0A to 2A VOUT (50mV/Div) VIN = 4.2V, VOUT = 3.5V, IOUT = 0A to 2A, tR = tF = 1μs VOUT (100mV/Div) LX1 (5V/Div) LX2 (5V/Div) IOUT (500mA/Div) LX1 LX2 IOUT IOUT (1A/Div) Time (5ms/Div) Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 Time (50μs/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT6158A Line Transient Shutdown Current 1.0 VIN = 3V to 3.6V, tR = tF = 10μs, VOUT = 3.5V, IOUT = 1A VOUT = 3.5V, EN = 0 0.8 Quiescent (μ A) VOUT (50mV/Div) 0.6 TC = 85°C 0.4 TC = −40°C TC = 25°C 0.2 VIN (200mV/Div) 0.0 2.5 Time (100μs/Div) 3.5 4.0 4.5 5.0 Input Voltage (V) Switching Quiescent Current Maximum Output Current vs. Input Voltage 10 Maximum Output Current (A) 4.2 9 Quiescent (μA) 3.0 8 7 6 VOUT = 3.5V 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 VOUT = 3.5V 2.4 5 3.6 3.8 4.0 4.2 4.4 4.6 4.8 2.8 5.0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 Input Voltage (V) Input Voltage (V) Power On Power Off VEN (2V/Div) VEN (2V/Div) VOUT (1V/Div) VOUT (1V/Div) ILX (1A/Div) ILX (1A/Div) VIN = 3.6V, VOUT = 3.5V, IOUT = 2A Time (200μs/Div) Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 VIN = 3.6V, VOUT = 3.5V, IOUT = 2A Time (20μs/Div) is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A Application Information The RT6158A Buck-Boost DC-DC converter can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 2A. The maximum peak current in the switches is limited to a typical value of 4.5A. The typical operating input voltage is from 2.5V and 5V. The RT6158A output voltage can be set from 2.1V to 5.2V by changing the external divided resistor on the FB pin. The converter feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes operation. Enable The device can be enabled or by the EN pin. When the EN pin is higher than the threshold of logic high, the device starts operation with soft-start. Once the EN pin is set at low, the device will be shut down. In shutdown mode, the converter stops switching, internal control circuitry is turned off, and the chip enters a low guiescent state for power consumption. The EN pin must not be left floating and must be terminated. Output Voltage Setting The RT6158A output voltage can be set from 2.1V to 5.2V by changing the external divided resistor on the FB pin. The resistor divider must be connected between VOUT, FB and GND. The typical value of the voltage at the FB pin is 800mV. For decrease the leakage current on FB pin, it is recommended to keep the resistor R2 with large value. For example, it can be R1 = 1MΩ and R2 = 294kΩ for VOUT = 3.5V application, the following Equation is as below : V R1 = R2   OUT  1  VFB  Dynamic Voltage Scaling Control The RT6158A output voltage is adjustable via external divided resistors. If there are different output voltages to be switched (DVS) for application during IC operation (EN = H), the maximum output voltage needs to be selected as the 1st setting for start-up. Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 For example : VOUT1 = 3.3V, VOUT2 = 5V, VOUT3 = 3.8V The maximum output voltage VOUT2 needs to be selected as the 1st start-up setting. MODE states and Synchronization The MODE pin can be used to select different operation modes. When MODE is set high, it means the RT6158A will operate at PFM mode for used to improve efficiency. At this point the converter operates with reduced switching frequency and with a minimum quiescent current to maintain high efficiency. When the load increases, the device will automatically switch to PWM mode. The PFM mode can be disabled by programming the MODE pin low. Connecting a clock signal at MODE pin can force the RT6158A switching frequency to synchronize to the connected clock frequency. The MODE pin input supports standard logic thresholds and the frequency range is between 2.2MHz to 2.6MHz. The MODE pin must not be left floating and must be terminated. Under-Voltage Lockout The under-voltage lockout circuit prevents the device from operating incorrectly at low input voltages. It prevents the converter from turning on the power switches under undefined conditions and prevents the battery from deep discharge. VIN voltage must be greater than 2.15V to enable the converter. During operation, if VIN voltage drops below 2.05V, the converter is disabled until the supply exceeds the UVLO rising threshold. The RT6158A automatically restarts if the input voltage recovers to the input voltage UVLO high level. Short Circuit Protection When the output is shorted to ground, the inductor current decays very slowly rate during a single switching cycle. A current runaway detector is used to monitor inductor current. As current increasing beyond the control of current loop, switching cycles will be skipped to prevent current runaway form occurring. is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT6158A Protection Type Threshold Refer to Electrical Spec. OCP IL > 4.5A Turn on B, D MOS CL will trigger right away. IL < 4.5A UVLO VIN < 2.05V Shutdown 100s VIN > 2.15V OTP TEMP > 160°C Shutdown No delay OTP Hysteresis = 20°C Output OVP VOUT > 5.6V Stop switching No delay VOUT < 5.3V SCP f SW become 1/4 No delay After FAULT 40ms VOUT < 1.2V Protection Method   Over-Temperature Protection The device has a built-in temperature sensor which monitors the internal junction temperature. If the temperature exceeds the OTP threshold, the device stops operating and enters shutdown mode. As soon as the IC temperature decreases below the threshold with a hysteresis, it starts operating again. Over-Voltage Protection When the VOUT pin is floating, the device will trigger the over-voltage protection to avoid the output voltage exceeding critical values for device. In case it reaches the OVP threshold, the device will regulate the output voltage to this value. Inductor Selection The recommended power inductor is 1μH with over 4.5A saturation current rating. In applications, it needs to select an inductor with the low DCR for good performance and efficiency. Input and Output Capacitor Selection The input and output capacitors should be ceramic X5R type with low ESL and ESR. The recommended input capacitor value is 2 x 10μF. The recommended output capacitor value is 4 x 10μF. The output capacitor selection determines the output voltage ripple and transient response. It is recommended to use ceramic capacitors placed as close as possible to the VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors which cannot be placed close to the IC, using a small ceramic capacitor in parallel to the large one is recommended. This small capacitor should be placed as close as possible to the VOUT and GND pins of the IC. Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 Shut Down Delay Time Reset Method If the RT6158A operates in Buck mode, the worst-case voltage ripple occurs at the highest input voltage. When the Buck-boost operates in Boost mode, the worst-case voltage ripple occurs at the lowest input voltage. A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain control loop stability. There are no additional requirements regarding minimum ESR. Low ESR capacitors should be used to minimize output voltage ripple. Larger capacitors will cause lower output voltage ripple as well as lower output voltage drop during load transients. 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) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. For continuous operation, the maximum operating junction temperature indicated under Recommended Operating Conditions is 125°C. The junction-to-ambient thermal resistance, θJA, is highly package dependent. For a WLCSP-25B 2.07x2.33 (BSC) package, the thermal resistance, θJA, is 35.7°C/W on a standard JEDEC 51-7 high effective-thermal-conductivity four-layer test board. is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A The maximum power dissipation at TA = 25°C can be calculated as below : PD(MAX) = (125°C − 25°C) / (35.7°C/W) = 2.8W for a WLCSP-25B 2.07x2.33 (BSC) package. The maximum power dissipation depends on the operating ambient temperature for the fixed TJ(MAX) and the thermal resistance, θJA. 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 Layout Considerations Some PCB layout guidelines for optimal performance of the RT6158A list as following. Following figure shows the real PCB layout considerations and it is based on the real component size whose unit is millimeter (mm).  The input capacitor should be placed as closed as possible to PVIN pin for good filtering.  The high current path should be made as short and wide as possible.  The inductor should be placed as close to LX1 and LX2 pin for reducing EMI.  The output capacitor should be placed as closed as PGND pin to ground plane to reduce noise coupling. Four-Layer PCB 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curve of Maximum Power Dissipation Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT6158A TOP Layer CFF Inner Layer1 0201R R2 R1 Inner Layer2 0603R 0603R Bottom Layer VIN VOUT CIN FB PVIN LX1 MODE LX2 VOUT PVIN LX1 PGND LX2 VOUT PVIN LX1 PGND LX2 VOUT PVIN LX1 PGND LX2 VOUT COUT 0402C AGND 0402C AGND 0402C EN 0402C 0402C 0402C AVIN GND L1 2520L Figure 2. PCB Layout Guide Copyright ©2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS6158A-05 August 2019 RT6158A Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.500 0.600 0.020 0.024 A1 0.170 0.230 0.007 0.009 b 0.240 0.300 0.009 0.012 D 2.280 2.380 0.090 0.094 D1 E 1.600 2.020 0.063 2.120 0.080 0.083 E1 1.600 0.063 e 0.400 0.016 25B WL-CSP 2.07x2.33 Package (BSC) Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS6158A-05 August 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT6158A Footprint Information Package Number of Pin WL-CSP2.07*2.33-25(BSC) 25 Type NSMD SMD Footprint Dimension (mm) e 0.400 A B 0.240 0.340 0.270 0.240 Tolerance ±0.025 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. www.richtek.com 14 DS6158A-05 August 2019