RT6206B RICHTEK | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 15
Technical content
Features
ACOTTM Mode Enables Fast Transient Response 4.5V to 18V Input Voltage Range 5.5A Output Current 35mΩΩΩΩΩ Internal Low Site N-MOSFET Advanced Constant On-Time Control Support All Ceramic Capacitors Up to 95% Efficiency Discontinuous Operating Mode at Light Load 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 5.5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
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. RT6206B Package Type SP : SOP-8 (Exposed Pad-Option 2) QW : WDFN-10L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) UVP Trim Operation H : Hiccup RT6206B VREG5 FB VIN BOOT SW SS VOUTVIN GND ENEnable PGOOD*Power Good * : PGOOD pin for WDFN-10L 3x3 only.
DS6206B-01 May 2015www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Functional Pin Description Pin No. Pin Name Pin Function SOP-8 (Exposed Pad) WDFN-10L 3x3 1 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 2 FB Feedback Voltage Input. It is used to regulate the output of the converter to a set value via an external resistive vo ltage divider. The feedback threshold voltage is 0.765V typically. 3 3 VREG5 Internal Regulator Output. Connect a 1 F capacitor to GND to stabilize output voltage. 4 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) (Exposed Pad) GND Power Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 6 6, 7 SW Switch Node. Connect this pin to an external L-C filter. 7 8 BOOT Bootstrap Supply for High Side Gate Driver. Connect a 0.1 F capacitor between the BOOT and SW pin. 8 9, 10 VIN Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a suitably large (10F x 2) ceramic capacitor. -- 5 PGOOD Open Drain Power Good Indicator Output. Pin Configurations (TOP VIEW) SOP-8 (Exposed Pad) EN FB VREG5 SS VIN BOOT GND SW GND 4 5 WDFN-10L 3x3 Marking Information RT6206BH GSPYMDNN RT6206BHGSP : Product Number YMDNN : Date Code RT6206BHGSP EN FB PGOOD SS VIN VIN BOOT SW SW VREG5 GND RT6206BHGQW 5J=YM DNN 5J= : Product Code YMDNN : Date Code
DS6206B-01 May 2015 www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Function Block Diagram Operation The RT6206B is a synchronous step-down converter with advanced constant on-time control mode. Using the ACOT TM 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 Power Good (for WDFN-10L 3x3 only) After soft-start in finished, the power good function will be activated. When the FB is activated, the PGOOD will become an open-drain output. If the FB is below, the PGOOD pin will be pulled low. * : PGOOD pin for WDFN-10L 3x3 only. Comparator -FB 0.9 x VREF PGOOD* POR & Reg Driver BOOT VREG5 Control VBIAS FB Min. Off-Time Ripple Gen. VREF ZC Comparator SS SW GND EN VREG5 OC 6µA VREG5 UV & OV SW VIN On-Time VIN FB
DS6206B-01 May 2015www.richtek.com Copyright 2015 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 Logic-High 2 -- 18 EN Input Voltage Logic-Low -- -- 0.4 V VFB Voltage TA = 25C 0.757 0.765 0.773 Feedback Threshold Voltage V FB TA = 40C to 85C 0.755 -- 0.775 V 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
DS6206B-01 May 2015 www.richtek.com Copyright 2015 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 Load Regulation 0 IVREG5 5mA -- -- 100 mV Output Current I VREG5 V IN = 6V, VREG5 = 4V, TA = 25C -- 70 -- mA RDS(ON) Switch On Resistance High-Side RDS(ON)_H (VBOOT VSW) = 5.5V -- 80 -- m Low-Side RDS(ON)_L -- 35 -- Current Limit Current Limit ILIM 5.8 6.9 8.4 A Thermal Shutdown Thermal Shutdown Threshold T SD Shutdown Temperature -- 150 -- C Thermal Shutdown Hysteresis TSD -- 20 -- On-Time Timer Control On-Time t ON V OUT = 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 V Hysteresis 0.16 0.35 0.47 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 Power Good PGOOD Threshold VFB Rising 85 90 95 % VFB Falling -- 85 -- PGOOD Sink Current PGOOD = 0.5V 2.5 5 -- mA
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Table 1. Suggested Component Values (VIN = 12V)
- : PGOOD pin for WDFN-10L 3x3 only.
DS6206B-01 May 2015 www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Switching Frequency vs. Temperature 500 520 540 560 580 600 620 640 660 680 700 -50 -25 0 25 50 75 100 125 Temperature (°C) Switching Frequency (kHz) 1 Typical Operating Characteristics Efficiency vs. Output Current 100 0.001 0.01 0.1 1 10 Output Current (A) Efficiency (%) VIN = 12V VOUT = 1.05V VOUT = 5V 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 = 12V, VOUT = 1.05V, IOUT = 0A to 5.5A Feedback Voltage vs. Temperature 0.700 0.710 0.720 0.730 0.740 0.750 0.760 0.770 0.780 0.790 0.800 -50 -25 0 25 50 75 100 125 Temperature (°C) Feedback Voltage (V) VIN = 12V, VOUT = 0.765V, IOUT = 0.6A Feedback Voltage vs. Input Voltage 0.740 0.745 0.750 0.755 0.760 0.765 0.770 0.775 0.780 4 5 6 7 8 9 1 01 11 21 31 41 51 61 71 8 Input Voltage (V) Feedback Voltage (V) VIN = 12V, VOUT = 0.765V, IOUT = 0.6A Switching Frequency vs. Output Current 100 200 300 400 500 600 700 800 Output current (A) Switching Frequency (kHz) 1 VIN = 12V, VOUT = 1.05V, IOUT = 0A to 5.5A
DS6206B-01 May 2015www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. 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) Shutdown Current vs. Temperature -50 -25 0 25 50 75 100 125 Temperature (°C) Shutdown Current (μA) 1 VIN = 12V, VOUT = 1.05V, IOUT = 0A Quiescent Current vs. Temperature 600 650 700 750 800 850 900 950 1000 -50 -25 0 25 50 75 100 125 Temperature (°C) Quiescent Current (μA) VIN = 12V, VOUT = 1.05V, IOUT = 0A Time (500ns/Div) Output Ripple Voltage VOUT (10mV/Div) VSW (5V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A Time (100 μs/Div) Load Transient Response IOUT (2A/Div) VOUT (20mV/Div) VIN = 12V, VOUT = 1.05V, IOUT = 1A to 5A VOUT (0.5V/Div) IOUT (5A/Div) VIN (10V/Div) Time (2.5ms/Div) Power On from VIN VIN = 12V, VOUT = 1.05V, IOUT = 5A
DS6206B-01 May 2015 www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. 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 Voltage (V) Falling Rising Time (50 μs/Div) Power Off from EN VOUT (0.5V/Div) IOUT (5A/Div) VEN (5V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A Time (10ms/Div) Power Off from VIN VOUT (0.5V/Div) IOUT (5A/Div) VIN (10V/Div) VIN = 12V, VOUT = 1.05V, IOUT = 5A Time (500 μs/Div) Power On from EN VIN = 12V, VOUT = 1.05V, IOUT = 5A VOUT (0.5V/Div) IOUT (5A/Div) VEN (5V/Div) EN Threshold Voltage vs. Temperature 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 -50 -25 0 25 50 75 100 125 Temperature (°C) EN Threshold Voltage (V ) VIN = 12V, VOUT = 1.05V Falling Rising
Copyright 2015 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.
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation. Figure 5. External Bootstrap Diode and RMS current handling requirements. voltage is lower than 5.5V or duty ratio is higher than 65%. on the maximum power dissipation.
DS6206B-01 May 2015www.richtek.com Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ri chtek Technology Corporation.© 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
DS6206B-01 May 2015 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 circuitry entirely embodied in a Richtek product. Information furnish ed 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 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 R ichtek or its subsidiaries. Dimensions In Millimeters Dimensions In Inches Symbol 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 0.180 0.300 0.007 0.012 D 2.950 3.050 0.116 0.120 D2 2.300 2.650 0.091 0.104 E 2.950 3.050 0.116 0.120 E2 1.500 1.750 0.059 0.069 e 0.500 0.020 L 0.350 0.450 0.014 0.018 W-Type 10L DFN 3x3 Package 1 122 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. DETAIL A Pin #1 ID and Tie Bar Mark Options D E A L be SEE DETAIL A