RT6202A RICHTEK | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 15
Technical content
Features
ACOT® Mode Enables Fast Transient Response 4.5V to 18V Input Voltage Range 35mΩΩΩΩΩ Internal Low Side N-MOSFET Advanced Constant On-Time Control Support All Ceramic Capacitors Up to 95% Efficiency 650kHz Switching Frequency at all Load Current (RT6202B) Discontinuous Operating Mode at Light Load (RT6202A) Adjustable Output Voltage from 0.765V to 8V Adjustable Soft-Start Cycle-by-Cycle Current Limit Input Under Voltage Lockout RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems Computer Peripherals LCD Monitors and TVs Green Electronics/Appliances Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs Simplified Application Circuit 5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter Pin Configuration (TOP VIEW) SOP-8 (Exposed Pad) EN FB VREG5 SS VIN BOOT GND SW GND 4 5 RT6202A/B VREG5 FB VIN BOOT SW SS VOUTVIN GND ENEnable
DS6202A/B-01 January 2022www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Functional Pin Description Pin No. Pin Name Pin Function 1 EN Enable Control Input. A logic-high enables the converter; a logic-low forces the IC into shutdown mode reducing the supply current to less than 10A. 2 FB Feedback Voltage Input. It is used to regu late the output of the converter to a set value via an external resistive voltage divider. The feedback threshold voltage is 0.765V typically. 3 VREG5 Internal Regulator Output. Connect a 1F capacitor to GND to stabilize output voltage. 4 SS Soft-Start Time Setting. Connect an external capacitor between this pin and GND to set the soft- start time. 5, 9 (Exposed Pad) GND Power Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 6 SW Switch Node. Connect this pin to an external L-C filter. 7 BOOT Bootstrap Supply for High Side Gate Driver. Connect a 0.1 F capacitor between the BOOT and SW pin. 8 VIN Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a suitably large (10F x 2) ceramic capacitor.
Ordering Information
Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT6202AHGSP : Product Code YMDNN : Date Code RT6202AHGSP RT6202BHGSP : Product Code YMDNN : Date Code RT6202BHGSP RT6202A/B Package Type SP : SOP-8 (Exposed Pad-Option 2) Lead Plating System G : Green (Halogen Free and Pb Free) UVP Trim Operation H : Hiccup PSM/PWM Mode A : PSM Mode B : PWM Mode RT6202AH GSPYMDNN RT6202BH GSPYMDNN
DS6202A/B-01 January 2022 www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Functional Block Diagram Operation The RT6202A/B is a synchronous step-down converter with advanced constant on-time control mode. Using the ACOT ® control mode can reduce the output capacitance and provide fast transient response. It can minimize the component size without additional external compensation network. Internal Regulator The regulator provides 5V power to supply the internal control circuit. Connecting a 1 μF ceramic capacitor for decoupling and stability is required. Soft-Start In order to prevent the converter output voltage from overshooting during the startup period, the soft-start function is necessary. The soft-start time is adjustable and can be set by an external capacitor. UVLO Protection To protect the chip from operating at insufficient supply voltage, the UVLO is needed. When the input voltage of VIN is lower than the UVLO falling threshold voltage, the device will be latch-off. Thermal Shutdown When the junction temperature exceeds the OTP threshold value, the IC will shut down the switching operation. Once the junction temperature cools down and is lower than the OTP lower threshold, the converter will automatically resume switching POR & Reg Driver BOOT VREG5 Control VBIAS On-Time VIN FB Min. Off-Time Ripple Gen. VREF ZC Comparator SS SW GND EN VREG5 OC 6µA VREG5 UV & OV SW FB VIN
DS6202A/B-01 January 2022www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Recommended Operating Conditions (Note 3) Absolute Maximum Ratings (Note 1) Power Dissipation, PD @ TA = 25°C Package Thermal Resistance (Note 2) (VIN = 12V, TA = 25°C, unless otherwise specified)
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit Supply Current Shutdown Current I SHDN V EN = 0V -- 1 10 A Quiescent Current I Q V EN = 5V, VFB = 0.8V -- 1 1.3 mA Logic Threshold EN Input Voltage Logic-High 2 -- 18 V Logic-Low -- -- 0.4 VFB Voltage Feedback Threshold Voltage V FB TA = 25C 0.757 0.765 0.773 V TA = 40C to 85C 0.755 -- 0.775 Feedback Input Current I FB V FB = 0.8V -- 0.01 0.1 A VREG5 Output VREG5 Output Voltage V REG5 6V VIN 18V, 0 < IVREG5 5mA 4.8 5.1 5.4 V Line Regulation 6V VIN 18V, IVREG5 = 5mA -- -- 20 mV Load Regulation 0 IVREG5 5mA -- -- 100 mV Output Current I VREG5 V IN = 6V, VREG5 = 4V, TA = 25C -- 70 -- mA
DS6202A/B-01 January 2022 www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Note 1. Stresses beyond those listed “Absolute Maximum Ratings ” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. θ JA is measured at T A = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit RDS(ON) High-Side RDS(ON)_H (VBOOT VSW) = 5.5V -- 120 -- Switch On Resistance Low-Side RDS(ON)_L -- 35 -- Current Limit Current Limit ILIM 6.1 6.9 8.4 A Thermal Shutdown Thermal Shutdown Threshold T SD Shutdown Temperature -- 150 -- Thermal Shutdown Hysteresis TSD -- 20 -- On-Time Timer Control On-Time t ON V IN = 12V, VOUT = 1.05V -- 135 -- ns Minimum Off-Time t OFF(MIN) VFB = 0.7V -- 260 310 ns Soft-Start SS Charge Current V SS = 0V -- 6 -- A SS Discharge Current V SS = 0.5V 0.1 0.2 -- mA UVLO UVLO Threshold Wake Up V REG5 3.6 3.85 4.1 Hysteresis 0.16 0.35 0.47 V Output Under Voltage and Over Voltage Protection OVP Trip Threshold OVP Detect 115 120 125 % OVP Prop Delay -- 5 -- s UVP Trip Threshold 65 70 75 UVP Hysteresis -- 10 -- UVP Prop Delay -- 250 -- s UVP Enable Delay t UVPEN Relative to Soft-Start Time -- tSS x 1.7 -- ms
Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Table 1. Suggested Component Values (VIN = 12V)
DS6202A/B-01 January 2022 www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Typical Operating Characteristics Output Voltage vs. Output Current 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Output Current (A) Output Voltage (V) VIN = 18V VIN = 12V VIN = 5V VOUT = 1.05V RT6202A Output Voltage vs. Input Voltage 1.040 1.042 1.044 1.046 1.048 1.050 1.052 1.054 1.056 1.058 1.060 468 1 0 1 2 1 4 1 6 1 8 Input Voltage (V) Output Voltage (V) VIN = 4.5V to 18V, V OUT = 1.05V Feedback Threshold Voltage vs. Temperature 0.750 0.755 0.760 0.765 0.770 0.775 0.780 -50 -25 0 25 50 75 100 125 Temperature (°C) Feedback Threshold Voltage (V ) VIN = 12V, VOUT = 1.05V, IOUT = 0A Output Voltage vs. Output Current 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Output Current (A) Output Voltage (V) RT6202B VOUT = 1.05V VIN = 18V VIN = 12V VIN = 5V Efficiency vs. Output Current 100 0.001 0.01 0.1 1 10 Output Current (A) Efficiency (%) VOUT = 1.05V RT6202B VIN = 5V VIN = 12V VIN = 18V Efficiency vs. Output Current 100 0.001 0.01 0.1 1 10 Output Current (A) Efficiency (%) RT6202A VOUT = 1.05V VIN = 5V VIN = 12V VIN = 18V
DS6202A/B-01 January 2022www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Switching Frequency vs. Temperature 600 610 620 630 640 650 660 670 680 690 700 - 5 0- 2 5 0 2 5 5 0 7 51 0 0 1 2 5 Temperature (°C) Switching Frequency (kHz) 1 Current Limit vs. Input Voltage 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 4 6 8 1 01 21 41 61 8 Input Voltage (V) Current Limit (A) Current Limit vs. Temperature 5.0 5.5 6.0 6.5 7.0 7.5 8.0 - 5 0- 2 5 0 2 5 5 0 7 51 0 0 1 2 5 Temperature (°C) Current Limit (A) VIN = 12V, VOUT = 1.05V Switching Frequency vs. Input Voltage 600 610 620 630 640 650 660 670 680 690 700 468 1 0 1 2 1 4 1 6 1 8 Input Voltage (V) Switching Frequency (kHz) 1 Time (100 μs/Div) Load Transient Response IOUT (2A/Div) VOUT (20mV/Div) RT6202B VIN = 12V, VOUT = 1.05V, IOUT = 0A to 5A Time (100 μs/Div) Load Transient Response IOUT (2A/Div) VOUT (20mV/Div) RT6202A VIN = 12V, VOUT = 1.05V, IOUT = 1A to 5A
DS6202A/B-01 January 2022 www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Time (10ms/Div) Power Off from VIN VOUT (1V/Div) IOUT (2A/Div) VIN (10V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A Time (2.5ms/Div) Power On from VIN VIN = 12V, VOUT = 1.05V, IOUT = 5A VOUT (1V/Div) IOUT (2A/Div) VIN (10V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A Time (1 μs/Div) Switching VOUT (5mV/Div) IL (5A/Div)VIN = 12V, VOUT = 1.05V, IOUT = 1A Time (1 μs/Div) Switching VOUT (5mV/Div) IL (1A/Div) Time (500 μs/Div) Power On from EN VEN (2V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A VOUT (1V/Div) IOUT (5A/Div) Time (500 μs/Div) Power Off from EN VIN = 12V, VOUT = 1.05V, IOUT = 5A VSW (10V/Div) VSW (10V/Div) VEN (2V/Div) VOUT (1V/Div) IOUT (5A/Div)
DS6202A/B-01 January 2022www.richtek.com Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. UVP Time (10ms/Div) VIN = 12V, VOUT = 1.05V, IOUT shot to GND IOUT (2A/Div) VOUT (500mV/Div) EN Threshold Voltage vs. Temperature 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 -50 -25 0 25 50 75 100 125 Temperature (°C) EN Threshold Voltage (V ) VIN = 12V, VOUT = 1.05V Rising Falling UVLO vs. Temperature 3.4 3.5 3.6 3.7 3.8 3.9 4.0 -50 -25 0 25 50 75 100 125 Temperature (°C) UVLO (V) Rising Falling
Copyright 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. voltage as shown in Figure 4. Figure 4. Output Voltage Setting operation when junction temperature exceeds 150 °C. temperature should be prevented from rising above 150°C. use 1% tolerance or better divider resistors. trapezoidal current at the source of the high side MOSFET. deviations do not offer much relief. for COUT selection to ensure that the control loop is stable. and decreases with higher inductance.
Figure 7. PCB Layout Guide as close to the IC as possible. components away from this trace. Connect feedback network behind the output capacitors. components near the RT6202A/B FB pin. strong ground plane for heat sinking and noise protection.
DS6202A/B-01 January 2022 www.richtek.com 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 ci rcuitry entirely embodied in a Richtek product. Information furnish ed by Richtek is believed to be accurate and reliable. However, no respon sibility is assumed by Richtek or its subsidiaries for its use; nor for any infringeme nts 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. A BJ F H M C D I Y X EXPOSED THERMAL PAD (Bottom of Package) 8-Lead SOP (Exposed Pad) Plastic Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 4.801 5.004 0.189 0.197 B 3.810 4.000 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.510 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.170 0.254 0.007 0.010 I 0.000 0.152 0.000 0.006 J 5.791 6.200 0.228 0.244 M 0.406 1.270 0.016 0.050 X 2.000 2.300 0.079 0.091 Option 1 Y 2.000 2.300 0.079 0.091 X 2.100 2.500 0.083 0.098 Option 2 Y 3.000 3.500 0.118 0.138 Outline Dimension