EA8210T6R

21V, 2A, 500KHz Synchronous Buck Converter EA8210 Datasheet General Description The EA8210 is a 2A buck regulator, designed to operate from 4.5V to 21V 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 EA8210 is designed to take into account the light load mode operation. At output loading 20mA condition, the efficiency up to 80%. The EA8210 has complete protection functions, including cycle-by-cycle current limit, short circuit protection, 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 EA8210 is available in the SOT23-6 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 21V Input Voltage Range Output Adjustable Down to 0.8V 2A Continuous Load Current Fixed 500KHz Switching Frequency Internal Compensation Cycle-by-Cycle Current Limit Auto Recovery Hiccup Mode Short Circuit Protection Stable with Low ESR Ceramic Output Capacitors Input UVLO Protection Auto Recovery OTP Protection Available in SOT23-6 Package Applications     Distributed Power Systems Netcom Products LCD TVs and Flat TVs Notebooks Pin Configurations (TOP VIEW) BOOT RUN FBK 6 5 4 Marking 1 2 3 GND LX PWR SOT23-6 1 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Pin Description Pin Name GND Function Description Pin No. Ground pin. 1 LX Internal MOSFET switching output. Connect LX pin with a low pass filter circuit to obtain a stable DC output voltage. 2 PWR The EA8210 power input pin. Recommended to use two 10uF MLCC capacitors between PWR pin and GND pin. 3 FBK Feedback input. Connect FBK pin and GND pin with voltage dividing resistors to set the output voltage. 4 RUN The device turns on/turns off control input. The EA8210 on/off state can be controlled by RUN pin voltage level. Connect RUN pin to PWR pin with a 100KΩ pull up resistor for automatic startup. 5 BOOT The power input of the internal high side N-MOSFET gate driver. Connect a 100nF ceramic capacitor from BOOT pin to LX pin. 6 Function Block Diagram PWR VREG UVLO Regulator VREG Current Sense RUN BOOT 1MΩ HSMOSFET Control Logic LX VREF FBK VREG OSC LSMOSFET POR GND OTP Figure 1. EA8210 internal function block diagram Ver. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 2 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Absolute Maximum Ratings Parameter Value Input Voltage (VPWR) -0.3V to +22V RUN Pin Input Voltage (VRUN) BOOT Pin Voltage (VBOOT) LX Pin Voltage (VLX) -0.3V to +6V VLX-0.3V to VLX+5V -0.3V to +(VPWR+0.5)V FBK Pin Voltage (VFBK) -0.3V to +6V 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 SOT23-6 Thermal Resistance (θJC) 125°C/W SOT23-6 Thermal Resistance (θJA) 250°C/W SOT23-6 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 +21V Output Voltage (VOUT) +0.6V to +17V Junction Temperature Range (TJ) 3 -40°C to +125°C Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8210 21V, 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 21 V 4.5 Shutdown Supply Current ISD VRUN = 0V Quiescent Current IQ VRUN = 2V, VFBK = 105% VREF 1 uA 600 800 uA 2 A Output Load Current ILOAD Reference Voltage VREF Switching Frequency FSW 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 4.5 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 4. 5V ≤ VPWR ≤ 21V 0.776 0.8 0.824 V 400 500 600 KHz 3 VRUN = 0V, VLX= 0V 1 10 uA 0.4 V 2 VFBK = 0.7V V 92 % High Side MOSFET Minimum On Time TONMIN 60 ns Input OVP Threshold VOVP 21.5 V Input OVP Hysteresis VOVP-HYST 100 mV TOTP 170 °C Thermal Shutdown Threshold 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. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 4 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Application Circuit Diagram L1 C3 6.8uH 100nF VOUT C2 22uF R1 120KΩ 1% VPWR 4.5V~21V BOOT LX PWR FBK RUN C4 (Optional) R3 51KΩ R2 22KΩ 1% C1 10uFx2 ON OFF GND EA8210 Figure 2. Typical application circuit diagram Ordering Information Part Number Package Type Packing Information EA8210T6R SOT23-6 Tape & Reel / 3000 Note (1): “T6”: Package type code. (2): “R”: Tape & Reel. 5 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8210 Vin=12V 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Typical Operating Characteristics VPWR=12V, L1=6.8uH, C1=10Fx2, C2=22uF, TA=25°C, unless otherwise noted Load Regulation 5.05 Output Voltage(V) Efficiency(%) Efficiency vs Load Current 100 95 90 85 80 75 70 65 60 Vout=5V 0.05 0.1 0.2 0.5 1 1.5 2 Load Current(A) CH1: VLX CH2: VOUT(AC) VPWR=12V, ILOAD=0.1A switching waveform CH1: VLX CH2: VOUT(AC) VPWR=16V, ILOAD=0.1A switching waveform Ver. 1.0 5.03 5.01 4.99 4.97 Vin=12V 4.95 0.05 0.1 0.2 0.5 1 Load Current (A) 1.5 2 CH1: VLX CH2: VOUT(AC) VPWR=12V, ILOAD=2A switching waveform CH1: VLX CH2: VOUT(AC) VPWR=16V, ILOAD=2A switching waveform Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 6 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Application Information Enable Control The EA8210 use RUN pin to control the regulator turns on / turns off. When the RUN pin input voltage is higher than 2V, the EA8210 enters the operating mode. Drive the RUN pin input voltage lower than 0.4V to ensure the EA8210 into shutdown mode, as shown in Figure3. When the device works in the shutdown mode, the shutdown supply current is about 1uA. The EA8210 also provides automatic startup function as shown in Figure 4. Connect RUN pin and PWR pin with a 100KΩ resistor, when the PWR supply input voltage increasing and higher than RUN pin threshold voltage, the EA8210 will enter operating mode automatically. VPWR 4.5V~21V PWR RUN VPWR 4.5V~21V PWR C1 22uF R4 100KΩ C1 22uF RUN ON OFF GND EA8210 GND EA8210 Figure 3. Enable control by RUN pin voltage Figure 4. Automatic startup application circuit Output Voltage Setting The EA8210 output voltage can be set via a resistor divider (R1, R2). The output voltage is calculated by following equation: R1 VOUT  0.8   0.8 V R2 L1 6.8uH VOUT LX R1 R3 FBK R2 GND EA8210 Figure 5. Feedback Network 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, R3 resistance value for reference. Output Voltage 7 R1 Resistance R2 Resistance R3 Resistance Tolerance 5V 120KΩ 22KΩ 51KΩ 1% 3.3V 150KΩ 47KΩ 51KΩ 1% 1.8V 150KΩ 120KΩ 75KΩ 1% 1.2V 100KΩ 200KΩ 120KΩ 1% Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet 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: Vendor Part Number Capacitance Edc Parameter Size 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 EA8210. 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 EA8210 PCB layout considerations, please refer to the following suggestions in order to get good performance.  High current path traces (shown as below) 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. LX).  LX is a high current noise node. Complete the layout by using short and wide traces. VPWR L1 VOUT C2 R1 R2 C4 (Optional) C3 BOOT LX FBK R3 PWR C1 R4 RUN GND EA8210 * Bold lines indicate high current paths Ver. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 8 EA8210 21V, 2A, 500KHz Synchronous Buck Converter Datasheet Package Information SOT23-6 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 9 Symbol Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0