RT4723WSC

RT4723 Dual Output AMOLED Bias General Description Features The RT4723 is a highly integrated Boost, LDO and  2.5V to 4.6V Supply Voltage Range inverting charge pump to generate positive and  Single Wire Protocol negative output voltage. The negative output voltages  Fixed 4.6V Positive Voltage Output can be adjusted from 0.6V to 2.4V with 100mV steps  Negative Voltage Output from 0.6V to 2.4V per 0.1V by SWIRE Pin by SWIRE interface protocol. The part maintains the highest efficiency by utilizing a 0.33x/0.5x mode  Auto-Mode Transition of 0.33x/0.5x Charge Pump fractional charge pump with automatic mode transition. With its input voltage range of 2.5V to 4.6V, the  Built-in Soft-Start RT4723 is powered by  55mA Maximum Output Current single-cell battery and the output current up to 55mA.  Programmable Output Fast Discharge Function The RT4723 is available in WL-CSP-15B 1.39x2.07  High Impedance Output when IC Shutdown (BSC) package to achieve optimized solution for PCB  UVLO, OCP, SCP, OTP Protection space.  Shutdown Current < 1A  Available in 15-Ball WL-CSP Package optimized for products Ordering Information Applications RT4723  Package Type WSC : WL-CSP-15B 1.39x2.07 (BSC) AMOLED Bias in Portable Device Marking Information Note : 36W Richtek products are :  36 : Product Code W : Date Code 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 VIN VIN LXP CBOOST BOOST CIN VOP VOP COP RT4723 C2P VON VON CF2 CON C2N C1P SWIRE CF1 C1N GND Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 PGND is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT4723 Pin Configuration (TOP VIEW) GND A1 A2 A3 C2N B3 C2P C3 C1N D3 C1P E3 VOP VON SWIRE B1 B2 PGND VIN C1 C2 GND LXP D1 D2 GND PGND E1 E2 BOOST WL-CSP-15B 1.39x2.07 (BSC) Functional Pin Description Pin No. Pin Name Pin Function A1, C2, D2 GND Ground. A2 VON Negative terminal output. A3 C2N Flying capacitor 2 negative connection. B1 SWIRE Enable and VON voltage setting. B2, E1 PGND Power ground. B3 C2P Flying capacitor 2 positive connection. C1 VIN Power input. C3 C1N Flying capacitor 1 negative connection. D1 LXP Switching node of boost converter. D3 C1P Flying capacitor 1 positive connection. E2 BOOST Output voltage of boost converter. E3 VOP Positive terminal output. Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Functional Block Diagram BOOST LXP UVLO VIN SCP1 Bandgap Reference VREF LDO VOP -0.33x/-0.5x Charge Pump C1P C1N C2P C2N P1 PWM Logic N1 GM + DAC RP2 OCP1 VREF RP1 Oscillator Fast Discharge VOP VON Soft-Start SWIRE Pulse Counter VON RN2 PGND SCP2 + RN1 DAC GND VREF Operation The RT4723 is a highly integrated Boost, LDO and The available voltage range is from 0.6V to 2.4V with inverting charge pump to generate positive and 100mV negative output voltage. It can support input voltage Temperature Protection (OTP) and Short Circuit range from 2.5V to 4.6V and the output current up to Protection (SCP) mechanisms to prevent the device 55mA. The VOP positive output voltage is set at a from damage with abnormal operations. When the typical value of 4.6V. The VON negative output voltage SWIRE voltage is logic low for more than 350s, the IC is set at a typical value of 2.4V and can be will be shut down with low input supply current less programmed through single wire protocol (SWIRE pin). than 1A. Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 per step. The RT4723 provides Over- is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT4723 Absolute Maximum Ratings (Note 1)  Supply Input Voltage VIN Pin --------------------------------------------------------------------------------------- 0.3V to 6V  Output voltage VOP Pin --------------------------------------------------------------------------------------------- 0.3V to 6V  Output voltage VON Pin --------------------------------------------------------------------------------------------- 6V to 0.3V  Others pin to GND ---------------------------------------------------------------------------------------------------- 0.3V to 6V  Power Dissipation, PD @ TA = 25°C WL-CSP-15B 1.39x2.07 (BSC) --------------------------------------------------------------------------------- 2W  Package Thermal Resistance (Note 2) WL-CSP-15B 1.39x2.07 (BSC), JA ----------------------------------------------------------------------------- 49.8°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 MM (Machine Model) ----------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 4)  Supply Input Voltage Range ---------------------------------------------------------------------------------------- 2.5V to 4.6V  Positive Output Voltage ---------------------------------------------------------------------------------------------- 4.6V  Negative Output Voltage Range ----------------------------------------------------------------------------------- 2.4V to 0.6V  Ambient Temperature Range -------------------------------------------------------------------------------------- 40C to 85C  Junction Temperature Range -------------------------------------------------------------------------------------- 40C to 125C Electrical Characteristics (VIN = 3.7V, VOP = 4.6V, VON = 2.4V, CIN = 4.7F, CBOOST = 20F, COP = 10F, CON = 30F, CF1 = 1F, L1 = 2.2H, TA = 25°C, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Unit 2.5 -- 4.6 V Power Supply Input Voltage Range VIN Under Voltage Lockout Threshold Voltage VUVLO_H VIN rising -- 2.2 2.5 V VUVLO_L VIN falling -- 2.1 2.3 V Over-temperature Protection TOTP (Note 5) -- 140 -- C Over-temperature Protection Hysteresis TOTP_HYST (Note 5) -- 15 -- C Shutdown Current ISHDN SWIRE = 0V -- -- 1 A Efficiency Peak 1 Eff_1 IOP = ION = 1mA (Note 5) -- 58 -- % Efficiency Peak 2 Eff_2 IOP = ION = 5mA (Note 5) -- 75 -- % Efficiency Peak 3 Eff_3 IOP = ION = 15mA -- 83 -- % -- 4.6 -- V (Note 5) LDO Output Positive Output Voltage Range VOP Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Parameter Symbol Test Conditions Min Typ Max Unit Positive Output Voltage Accuracy VOP_ACC 1 -- 1 % Positive Output Current Capability IOP_MAX -- -- 55 mA Positive Output Voltage Ripple VOP_RIPPLE IOP = 20mA -- 10 -- mV Line Regulation VOP_LINE VIN = 2.9 to 4.5V, IOP = 20mA (Note 5) -- 5 -- mV Load Regulation VOP_LOAD IOP = 0mA to 30mA -- 5 -- mV Fast Discharge Resistance RDISP -- 105 --  Short Circuit Protection VSCP1 -- < 80% VOP -- V 2.4 -- 0.6 V -- 100 -- mV 1 -- 1 % -- -- 30 -- -- 55 0.8 1 1.2 MHz -- 20 -- mV (Note 5) (Note 5) Charge Pump Output Negative Output Voltage Range VON Negative Output Voltage Setting Range VON_SET Negative Output Voltage Accuracy VON_ACC Negative Output Current Capability Per step ION_MAX (Note 5) ION_HBM VON = 2.2V (Note 5) mA Negative Charge Pump Switching Frequency fOSC_N Negative Output Voltage Ripple VON_RIPPLE ION = 20mA Line Regulation VON_LINE VIN = 2.9 to 4.5V, ION = 20mA (Note 5) -- 10 -- mV Load Regulation VON_LOAD ION = 0mA to 30mA -- 30 -- mV Fast Discharge Resistance RDISN -- 60 --  Short Circuit Protection VSCP2 -- > 80% VON -- V SWIRE Turn-off Detection Time toff_dly 350 -- -- s SWIRE Signal Stop Indicate Time tstop 350 -- -- s Twait after Data twait_int 10 -- -- ms Rising Input High Threshold Voltage Level VIH 1.2 -- VIN V Falling Input Low Threshold Voltage Level VIL 0 -- 0.4 V SWIRE Pull Low Resistor RSWIRE -- 300 -- k Wake up Delay twkp -- -- 1 s (Note 5) (Note 5) Logic Input (SWIRE) Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT4723 Parameter Symbol Test Conditions Min Typ Max Unit SWIRE Rising Time tR -- -- 200 ns SWIRE Falling Time tF -- -- 200 ns Clocked SWIRE High tON 2 10 40 s Clocked SWIRE Low tOFF 2 10 40 s SWIRE to VOP On Time tVOP_ON -- 1.6 -- ms Input Clocked SWIRE Frequency fSWIRE 25 -- 250 kHz 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 effective-thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Spec. is guaranteed by design. Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Typical Application Circuit L1 2.2µH VIN 2.5V to 4.6V C1 VIN CIN 4.7µF D1 LXP CBOOST1 10µF E2 BOOST VOP E3 CF2 1µF VON A2 CON1 10µF A3 C2N B1 C1P D3 SWIRE CON2 10µF CON3 10µF VON -0.6V to -2.4V CF1 1µF C1N C3 GND A1, C2, D2 VOP 4.6V COP 10µF RT4723 B3 C2P CBOOST2 10µF PGND B2, E1 Table 1. Component List of Evaluation Board Reference CIN CBOOST1, CBOOST2, COP, CON1, CON2, CON3 CF1, CF2 Qty. Part Number Description 1 GRM188R61C475KAAJ 4.7F/16V/X5R L1 Package 0603 Supplier Murata 6 GRM188R61A106KE69 10F/10V/X5R 0603 Murata 2 GRM155R61C105KE01 GLCLK2R201A 1269AS-H-2R2M = P2 0402 Murata ALPS Murata 1 1F/16V/X5R 2.2H 2.2H 2.5mm x 2.0mm x 1.0mm Time Diagram SWIRE Interface TON TOFF 90% Twkp 10% TR TF Power Sequence Twait_int > 10ms VIN SWIRE 0 Tss2 ≤ 2ms Tss1 ≤ 3ms Toff_dly > 350μs Tstop > 350μs … 0 1 2 1.5ms ≤ Tdly ≤ 2.5ms 10 11 4.6V Hi-Z VOP 0 0 TVOP_ON -1.4V VON Hi-Z -2.4V Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT4723 Table 2. VON Output Voltage with SWIRE Pulse Pulse VON(V) 0 2.4 (default) 1 2.4 2 2.3 3 2.2 4 2.1 5 2.0 6 1.9 7 1.8 8 1.7 9 1.6 10 1.5 11 1.4 12 1.3 13 1.2 14 1.1 15 1.0 16 0.9 17 0.8 18 0.7 19 0.6 20 0 Table 3. VOP/VON Shutdown Discharge Selection with SWIRE Pulse Pulse Discharge 21 Enable Once pulse 21 received on SWIRE pin, the RT4723 will enable the discharge function to discharge the VOP/VON outputs for 20ms and then enter high impedance state when fault or power-off condition. The discharge function is default disabled and outputs keep high impedance state when fault or power-off condition . Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Typical Operating Characteristics Efficiency vs. Output Current VOP vs. Output Current 4.620 90 4.615 85 80 VOP (V) Efficiency (%) 4.610 VIN = 4.5V 75 VIN = 3.7V VIN = 2.7V 70 65 VOP = 4.6, VON = 2.4V 0.005 0.01 0.015 0.02 0.025 4.600 4.595 VIN = 2.7V 4.590 VIN = 3.7V 4.585 VIN = 4.5V VOP = 4.6, VON = 2.4V 4.580 60 0 4.605 0 0.03 0.005 0.01 Output Current (A) VON vs. Output Current 4.600 -2.365 4.599 -2.370 4.598 VIN = 3.7V VIN = 2.7V -2.390 4.596 0.03 IOP = 0mA 4.595 IOP = 10mA 4.594 -2.395 4.593 -2.400 4.592 -2.405 IOP = 30mA 4.591 VOP = 4.6, V ON = 2.4V VOP = 4.6, V ON = 2.4V 4.590 -2.410 0 0.005 0.01 0.015 0.02 0.025 2.5 0.03 3.5 4.0 Input Voltage (V) VON vs. Input Voltage Power On SWIRE (4V/Div) -2.36 IOP = 30mA -2.37 3.0 Output Current (A) -2.35 VON (V) 0.025 4.597 VIN = 4.5V VOP (V) VON (V) -2.375 -2.385 0.02 VOP vs. Input Voltage -2.360 -2.380 0.015 Output Current (A) 4.5 5.0 VIN = 3.7V, VOP = 4.6V, VON = 2.4V VON (0.5V/Div) -2.38 IOP = 10mA -2.39 VOP (1V/Div) IOP = 0mA -2.40 VOP = 4.6, VON = 2.4V -2.41 2.5 3 3.5 4 Input Voltage (V) Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 4.5 IVIN (0.1A/Div) Time (1ms/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT4723 Power Off with Discharge VIN = 3.7V, VOP = 4.6V, VON = 2.4V SWIRE (4V/Div) Power OFF without Discharge SWIRE (4V/Div) VIN = 3.7V, VOP = 4.6V, VON = 2.4V VON (0.5V/Div) VON (0.5V/Div) VOP (1V/Div) IVIN (0.1A/Div) VOP (1V/Div) IVIN (0.1A/Div) Time (5ms/Div) Time (10ms/Div) Power On with SWIRE is Low Power On with SWIRE is High SWIRE (4V/Div) SWIRE (4V/Div) VIN (2V/Div) VIN (2V/Div) VBOOST (2V/Div) VBOOST (2V/Div) VIN = 3.7V, VOP = 0V, VON = 0V VIN = 3.7V, VOP = 4.6V, VON = -2.4V Time (10ms/Div) Time (10ms/Div) Power On with SWIRE from Low to High SWIRE (4V/Div) VIN (2V/Div) VBOOST (2V/Div) VIN = 3.7V Time (10ms/Div) Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Application Information The RT4723 is a highly integrated Boost, LDO and The inductance inverting charge pump to generate positive and according to the following equation : negative output voltages for AMLOED bias. It can support input voltage range from 2.5V to 4.6V and the output current up to 55mA. The VOP positive output can eventually be determined η   VIN    VOUT  VIN  2 L 0.4   VOUT   I OUT(MAX)fOSC 2 voltage is generated from the LDO supplied from a synchronous Boost converter, and VOP is set at a where fOSC is the switching frequency. For better typical value of 4.6V. The Boost converter output also system performance, a shielded inductor is preferred to drives an inverting charge pump controller to generate VON negative output voltage which is set at a typical value of 2.4V. The negative output voltage can be programmed through the dedicated pin which implements single wire protocol and the available voltage range is from 0.6V to 2.4V with 100mV per step. avoid EMI problems. Boost Output Capacitor Selection The output ripple voltage is an important index for estimating IC performance. This portion consists of two parts. One is the product of ripple current with the ESR of the output capacitor, while the other part is formed Input Capacitor Selection Input ceramic capacitor with 4.7F capacitance is suggested for applications. For better voltage filtering, select ceramic capacitors with low ESR, X5R and X7R types are suitable because of their wider voltage and by the charging and discharging process of the output capacitor. As shown in Figure 1, VOUT1 can be evaluated based on the ideal energy equalization. According to the definition of Q, the VOUT1 value can be calculated as the following equation : 1 =C OUT  VOUT1 fSOC IOUT  D = fSOC  COUT temperature ranges. Q = IOUT  D  Boost Inductor Selection VOUT1 The inductance depends on the maximum input current. As a general rule, the inductor ripple current range is 20% to 40% of the maximum input current. If 40% is where fOSC is the switching frequency and D is the duty cycle. selected as an example, the inductor ripple current can Finally, taking ESR into consideration, the overall be calculated according to the following equations : output ripple voltage can be determined by the VOUT  IOUT(MAX) IIN(MAX) =   VIN IL = 0.4  IIN(MAX) where η is the efficiency of the VOP Boost converter, following equation : VOUT = VESR + VOUT1 = VESR + IOUT  D fOSC  COUT where VESR = ICrms x RCESR IIN(MAX) is the maximum input current, and IL is the The output capacitor, COUT, should be selected inductor ripple current. The input peak current can then accordingly. be obtained by adding the maximum input current with half of the inductor ripple current as shown in the following equation : IPEAK = 1.2 x IIN(MAX) Note that the saturated current of the inductor must be greater than IPEAK. Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT4723 Over Current Protection The RT4723 includes a cycle-by-cycle current limit IL Input Current function which monitors the inductor current during each ON period. The power switch will be forced off to Inductor Current avoid large current damage once the current is over the limit level. Short Circuit Protection Output Current Time The RT4723 has an advanced output short-circuit protection mechanism which prevents the IC from DTs Output Ripple (ac) damage by unexpected applications. When the output becomes shorted to ground, and the output voltage is Time VOUT1 under the limit level with 1ms (typ.) duration, the bias function enters shutdown mode and can only re-start normal operation after triggering the SWIRE pin. Figure 1. Output Ripple Voltage Without Contribution of ESR Under Voltage Lockout Over Temperature Protection The RT4723 equips an over temperature protection circuitry to prevent overheating due to excessive power dissipation. The OTP will shut down the bias operation To prevent abnormal operation of the IC in low voltage condition, an under voltage lockout is included which shuts down IC operation when input voltage is lower than the specified threshold voltage. Soft-Start when ambient temperature exceeds 140C. Once the ambient temperature cools down by approximately 15C, IC will automatically resume normal operation. To maintain continuous operation, the maximum junction temperature should be prevented from rising above 125C. The RT4723 employs an internal soft-start feature to avoid high inrush current during start-up. The soft-start function is achieved by clamping the output voltage of the internal error amplifier with another voltage source that is increased slowly from zero to near VIN during the soft-start period. Negative Output Voltage Setting Thermal Considerations The junction temperature should never exceed the absolute maximum junction temperature T J(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 The Negative output voltage can be programmed by a MCU through the dedicated pin according to Table 2 “VON Output Voltage with SWIRE Pulse”. Shutdown Delay and Discharge When the SWIRE signal is logic low for more than 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 VOP/VON can be actively discharged to GND with where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and JA is the discharge function enabled referring to Table 3 junction-to-ambient thermal resistance. “VOP/VON Shutdown Discharge Selection with SWIRE For continuous operation, the maximum operating Pulse”. In shutdown mode, the input supply current for junction temperature indicated under Recommended the IC is less than 1A. Operating Conditions is 125C. The junction-to- 350s, the IC function will be shut down. The output Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 ambient thermal resistance, JA, is highly package dependent. For a WL-CSP-15B 1.39x2.07 (BSC) package, the thermal resistance, JA, is 49.8C/W on a Layout Considerations For the best performance of the RT4723, the following PCB layout guidelines should be strictly followed. standard JEDEC 51-7 high effective-thermalconductivity four-layer test board. The maximum power  For good regulation, place the power components as dissipation at TA = 25C can be calculated as below : close to the IC as possible. The traces should be PD(MAX) = (125C  25C) / (49.8C/W) = 2W for a wide and short especially for the high current output WL-CSP-15B 1.39x2.07 (BSC) package. loop. The maximum power dissipation depends on the  operating ambient temperature for the fixed T J(MAX) placed as close to the IC as possible and connected and the thermal resistance, JA. The derating curves in to the ground plane of the PCB. Figure 2 allows the designer to see the effect of rising ambient temperature on the maximum power  The flying capacitor should be placed as close to the C1P/C1N/C2P/C2N pin as possible to avoid noise dissipation. injection. 2.5 Maximum Power Dissipation (W)1 The input and output bypass capacitor should be Four-Layer PCB  Minimize the size of the LXP node and keep the traces wide and short. Care should be taken to avoid 2.0 running traces that carry any noise-sensitive signals 1.5 near LXP or high-current traces.  1.0 Separate power ground (PGND) and analog ground (GND). Connect the GND and the PGND islands at 0.5 a single end. Make sure that there are no other connections between these separate ground planes. 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 2. Derating Curve of Maximum Power Dissipation Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 CON2 RT4723 CON1 VON GND SWIRE CIN VIN GND VON C2N SWIRE PGND C2P VIN GND C1N LXP GND C1P PGND BOOST VOP CF2 CF1 CBST VOP L1 COP GND Figure 3. PCB Layout Guide Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 14 is a registered trademark of Richtek Technology Corporation. DS4723-03 September 2019 RT4723 Outline Dimension Dimensions In Millimeters Dimensions In Inches Symbol 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 2.020 2.120 0.080 0.083 D1 E 1.600 1.340 0.063 1.440 0.053 0.057 E1 0.800 0.031 e 0.400 0.016 WL-CSP-15B 1.39x2.07 (BSC) 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. Copyright © 2019 Richtek Technology Corporation. All rights reserved. DS4723-03 September 2019 is a registered trademark of Richtek Technology Corporation. www.richtek.com 15