EA8212T6R

18V, 2A, 500KHz Synchronous Buck Converter EA8212 Datasheet General Description The EA8212 is a 2A buck regulator , designed to operate from 4.5V to 18V input voltage range . Built-in low RDS(ON) high/low side Power-MOSFETS not only reduce external components and has up to 96% efficiency, ideal for 2A output current applications. The EA8212 is designed to take into account the light load mode operation. At output loading 20mA condition, the efficiency up to 80%. The EA8212 has complete protection functions, including cycle-by-cycle current limit, short circuit protection, OVP, OTP and UVLO protection. The internal compensation design not only allows users to more simplified application, and can reduce the cost of external components. The EA8212 is available in the SOT-23-6 package and easy to use. Features               Built-in Low RDS(ON) Power-MOSFETS Efficiency Up to 96% Light Load Efficiency Up to 80% 4.5V to 18V Input Voltage Range Output Adjustable Down to 0.6V 2A Continuous Load Current Fixed 500KHz Switching Frequency Internal Compensation Cycle-by-Cycle Current Limit Auto Recovery Hiccup Mode Short Circuit Protection Output Over Voltage Protection Input UVLO Protection Auto Recovery OTP Protection Available in SOT-23-6 Package Applications     Distributed Power Systems Netcom Products LCD TVs and Flat TVs Notebooks Pin Configurations (TOP VIEW) SWITCH PWR 6 RUN 4 5 Marking 1 2 3 BOOT GND FBK SOT-23-6 1 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Pin Description Pin Name Function Description Pin No. BOOT The power input of the internal high side N-MOSFET gate driver. Connect a 33nF ceramic capacitor from BOOT pin to SWITCH pin. 1 GND Ground pin. 2 FBK Feedback input. Connect FBK pin and GND pin with voltage dividing resistors to set the output voltage. 3 RUN The device turns on/turns off control input. The EA8212 on/off state can be controlled by RUN pin voltage level. Connect RUN pin to PWR pin with a 150KΩ pull up resistor for automatic startup. 4 PWR The EA8212 power input pin. Recommended to use two 10uF MLCC capacitors between PWR pin and GND pin. 5 SWITCH Internal MOSFET switching output. Connect SWITCH pin with a low pass filter circuit to obtain a stable DC output voltage. 6 Function Block Diagram PWR VREG UVLO Regulator VREG Current Sense Enable Control BOOT HSMOSFET Control Logic SWITCH RUN VREF FBK VREG OSC LSMOSFET POR GND OTP Figure 1. EA8212 internal function block diagram Ver. 1.2 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. 2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Absolute Maximum Ratings Parameter Value Input Voltage (VPWR) -0.3V to +21V RUN Pin Input Voltage (VRUN) -0.3V to +21V BOOT Pin Voltage (VBOOT) VSWITCH-0.3V to VSWITCH+6.3V SWITCH Pin Voltage (VSWITCH) -1V to +23V FBK Pin Voltage (VFBK) -0.3V to +6.3V Ambient Temperature operating Range (TA) -40°C to +85°C Maximum Junction Temperature (TJmax) +150°C Lead Temperature (Soldering, 10 sec) +260°C Storage Temperature Range (TS) -65°C to +150°C Note (1):Stresses beyond those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to “Absolute Maximum Ratings” conditions for extended periods may affect device reliability and lifetime. Package Thermal Characteristics Parameter Value SOT-23-6 Thermal Resistance (θJC) 125°C/W SOT-23-6 Thermal Resistance (θJA) 250°C/W SOT-23-6 Power Dissipation at TA=25°C (PDmax) 0.5W Note (1): PDmax is calculated according to the formula: PDMAX=(TJMAX-TA)/ θJA. Recommended Operating Conditions Parameter Value Input Voltage (VPWR) +4.5V to +18V RUN Pin Input Voltage (VRUN) -0.3V to +18V Output Voltage (VOUT) +0.6V to +12V Junction Temperature Range (TJ) 3 -40°C to +125°C Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Electrical Characteristics VPWR=12V, TA=25°C, unless otherwise noted Parameter Input Voltage Symbol Test Conditions VPWR Min Typ Max Unit 18 V 1 uA 4.5 Shutdown Supply Current ISD VRUN = 0V 0.1 Quiescent Current IQ VRUN = 2V, VFBK = 105% VREF, ILOAD = 0A 400 uA VPWR Rising 2.8 V 300 mV UVLO Threshold VUVLO UVLO Hysteresis VUV-HYST Output Load Current ILOAD Reference Voltage VREF Switching Frequency FSW Short Frequency FSHORT 4. 5V ≤ VPWR ≤ 21V 2 A 0.588 0.6 0.612 V 400 500 600 KHz VOUT = 0V 100 KHz High Side MOSFET On-Resistance RDS(ON)-HM 90 mΩ Low Side MOSFET On-Resistance RDS(ON)-LM 70 mΩ High Side MOSFET Current Limit ILIM-HM 4 A High Side MOSFET Leakage Current ILEAK-HM RUN Pin Input Low Voltage VRUN-L RUN Pin Input High Voltage VRUN-H Maximum Duty Cycle DMAX 3 VRUN = 0V, VSWITCH = 0V 1 10 uA 0.4 V 2 VFBK = 0.5V V 92 % High Side MOSFET Minimum On Time TONMIN 60 ns Thermal Shutdown Threshold TOTP 160 °C Thermal Shutdown Hysteresis THYST 30 °C Note (1): MOSFET on-resistance specifications are guaranteed by correlation to wafer level measurements. (2): Thermal shutdown specifications are guaranteed by correlation to the design and characteristics analysis. Ver. 1.2 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. 4 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Application Circuit Diagram L1 C3 6.8uH 33nF VOUT 3.3V/2A C2 22uFx1 R1 510KΩ 1% VPWR 4.5V~21V BOOT SWITCH PWR FBK RUN C4 (Optional) R2 110KΩ 1% C1 10uFx2 ON OFF GND EA8212 Figure 2. Typical application circuit diagram Ordering Information Part Number Package Type Packing Information EA8212T6R SOT-23-6 Tape & Reel / 3000 Note (1): “T6”: Package type code. (2): “R”: Tape & Reel. 5 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Typical Operating Characteristics VPWR=12V, VOUT=3.3V, L1=6.8uH, C1=10Fx2, C2=22uF, TA=25°C, unless otherwise noted Efficiency vs. Load Current Efficiency vs. Load Current 100 100 95 80 70 60 VPWR = 5V 50 Efficiency (%) Efficiency (%) 90 90 85 80 75 VPWR = 5V VPWR = 12V 70 VPWR = 12V VOUT = 1.2V 65 VOUT = 3.3V 60 40 10 100 ILOAD (mA) 10 1000 65 80 75 70 VPWR = 12V 65 VOUT = 5V 60 10 100 ILOAD (mA) Case Temperature (°C) 95 Efficiency (%) 75 85 55 45 35 25 VPWR = 12V VOUT = 3.3V 15 1000 0 3.37 3.385 3.36 3.380 VOUT (V) VOUT (V) 3.390 3.33 1.2 1.4 1.6 1.8 2 3.375 3.370 3.365 3.32 3.360 5 6 7 8 9 10 11 12 13 14 16 18 VPWR (V) Ver. 1.2 1 Load Regulation Line Regulation 3.34 0.2 0.4 0.6 0.8 ILOAD (A) 3.38 3.35 1000 TC vs. Load Current Efficiency vs. Load Current 100 90 100 ILOAD (mA) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 ILOAD (A) Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. 6 EA8212 Datasheet 18V, 2A, 500KHz Synchronous Buck Converter Typical Operating Characteristics VPWR=12V, VOUT=3.3V, L1=6.8uH, C1=10Fx2, C2=22uF, TA=25°C, unless otherwise noted VSWITCH VSWITCH ISWITCH ISWITCH 0A Loading Switching Waveform 2A Loading Switching Waveform VOUT (AC) VOUT (AC) ISWITCH ISWITCH 0A Loading Output Ripple Waveform VRUN VRUN VOUT VOUT VSWITCH VSWITCH ISWITCH ISWITCH 0A Loading Power On Waveform 7 2A Loading Output Ripple Waveform 2A Loading Power On Waveform Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Application Information Enable Control The EA8212 use RUN pin to control the regulator turns on / turns off. When the RUN pin input voltage is higher than 2V, the EA8212 enters the operating mode. Drive the RUN pin input voltage lower than 0.4V to ensure the EA8212 into shutdown mode, as shown in Figure3. When the device works in the shutdown mode, the shutdown supply current is less than 1uA. The EA8212 also provides automatic startup function as shown in Figure 4. Connect RUN pin and PWR pin with a 150KΩ resistor, when the PWR supply input voltage increasing and higher than RUN pin threshold voltage, the EA8212 will enter operating mode automatically. VPWR 4.5V~21V PWR RUN C1 10uFx2 VPWR 4.5V~21V PWR R3 150KΩ C1 10uFx2 RUN ON OFF GND EA8212 GND EA8212 Figure 3. Enable control by RUN pin voltage Figure 4. Automatic startup application circuit Output Voltage Setting The EA8212 output voltage can be set via a resistor divider (R1, R2). The output voltage is calculated by following equation: R1 VOUT  0.6   0.6 V R2 Taking into account the loop stability, R1 resistance value must be greater than 100KΩ. The following table lists common output voltage and the corresponding R1, R2 resistance value for reference. Output Voltage R1 Resistance R2 Resistance Tolerance 5V 220KΩ 30KΩ 1% 3.3V 510KΩ 110KΩ 1% 1.8V 200KΩ 100KΩ 1% 1.2V 100KΩ 100KΩ 1% Input / Output Capacitors Selection The input capacitors are used to suppress the noise amplitude of the input voltage and provide a stable and clean DC input to the device. Because the ceramic capacitor has low ESR characteristic, so it is suitable for input capacitor use. It is recommended to use X5R or X7R MLCC capacitors in order to have better temperature performance and smaller capacitance tolerance. In order to suppress the output voltage ripple, the MLCC capacitor is also the best choice. The suggested part numbers of input / output capacitors are as follows: Ver. 1.2 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. 8 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Vendor Part Number Capacitance Edc Parameter Size TDK C2012X5R1C106K 10uF 16V X5R 0805 TDK C3216X5R1E106K 10uF 25V X5R 1206 TDK C2012X5R0J226K 22uF 6.3V X5R 0805 TDK C3216X5R1A226M 22uF 10V X5R 1206 Output Inductor Selection The output inductor selection mainly depends on the amount of ripple current through the inductor ∆IL. Large ∆IL will cause larger output voltage ripple and loss, but the user can use a smaller inductor to save cost and space. On the contrary, the larger inductance can get smaller ∆IL and thus the smaller output voltage ripple and loss. But it will increase the space and the cost. The inductor value can be calculated as: VPWR  VOUT VOUT L  ΔIL  FSW VPWR For most applications, 4.7uH to 10uH inductors are suitable for EA8212. The suggested part numbers of output inductors are as follows: Vendor Part Number Inductance DCR (Max.) Saturation Current Dimensions (mm) (WxLxH) SUMIDA CDRH8D38-4R7 4.7uH 29mΩ 4A 8x8x3.8 SUMIDA CDRH8D43R-6R8 6.8uH 29.8mΩ 4.2A 8.3x8.5x4.5 PCB Layout Recommendations For EA8212 PCB layout considerations, please refer to the following suggestions in order to get good performance.  High current path traces (shown as Figure 5.) need to be widened.  Place the input capacitors as close as possible to the PWR pin to reduce noise interference.  Keep the feedback path (from VOUT to FBK) away from the noise node (ex. SWITCH).  SWITCH is a high current noise node. Complete the layout by using short and wide traces. VPWR L1 VOUT C2 R1 C4 (Optional) C3 BOOT SWITCH FBK R2 PWR R3 C1 RUN GND EA8212 * Bold lines indicate high current paths 9 Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.2 EA8212 18V, 2A, 500KHz Synchronous Buck Converter Datasheet Package Information SOT-23-6 Package A 6 4 5 B K D L 1 3 2 C M N C1 Top View Recommended Layout Pattern E H1 H G F H2 Side View Front View Unit: mm A Dimension Min Max 0.25 0.52 K Dimension Typ 1.40 B 2.59 3.01 L 1.40 C 0.85 1.05 M 0.95 C1 1.70 2.10 N 0.65 D 1.40 1.80 E 2.70 3.10 F 0.30 0.62 G 0.08 0.25 H 0.89 1.35 H1 0.89 1.20 H2 0.00 0.15 Symbol Ver. 1.3 Symbol Copyright © 2018 Everanalog Integrated Circuit Limited. All Rights Reserved. 10