EA8212AT6R

21V, 2A, 1.2MHz, PWM Mode EA8212A Synchronous Buck Converter Datasheet General Description The EA8212A is a pure PWM mode 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 95% efficiency, ideal for 2A output current applications. The EA8212A has complete protection functions, including cycle-by-cycle current limit, short circuit protection, OVP and OTP protection. The internal compensation design not only allows users to more simplified application, and can reduce the cost of external components. The EA8212A is available in the SOT-23-6 package and easy to use. Features               Built-in Low RDS(ON) Power-MOSFETS Efficiency Up to 95% PWM Mode Operating at Light Load and Heavy Load 4.5V to 21V Input Voltage Range Output Adjustable Down to 0.6V 2A Continuous Load Current Fixed 1.2MHz Switching Frequency Internal Compensation Cycle-by-Cycle Current Limit Auto Recovery Hiccup Mode Short Circuit Protection Shutdown Current < 1uA Output Over Voltage 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 © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8212A 21V, 2A, 1.2MHz, PWM Mode 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 100nF 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 EA8212A on/off state can be controlled by RUN pin voltage level. Don’t leave the RUN pin in the floating state, connect RUN pin to ground with a 1MΩ resistor for weak pull-down. 4 PWR The EA8212A 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 Regulator VREG VREG Current Sense Enable Control BOOT HSMOSFET Control Logic SWITCH RUN VREF FBK VREG OSC LSMOSFET POR GND OTP Figure 1. EA8212A internal function block diagram Ver. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 2 EA8212A Datasheet 21V, 2A, 1.2MHz, PWM Mode Synchronous Buck Converter Absolute Maximum Ratings Parameter Value Input Voltage (VPWR) -0.3V to +23V RUN Pin Input Voltage (VRUN) -0.3V to +23V BOOT Pin Voltage (VBOOT) VSWITCH-0.3V to VSWITCH+5V SWITCH Pin Voltage (VSWITCH) -1V to +23V 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 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 +21V RUN Pin Input Voltage (VRUN) -0.3V to +21V Output Voltage (VOUT) +0.6V to +12V Junction Temperature Range (TJ) 3 -40°C to +125°C Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8212A 21V, 2A, 1.2MHz, PWM Mode 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 0.1 1 uA Quiescent Current IQ VRUN = 2V, VFBK = 105% VREF, ILOAD = 0A 400 600 uA 2 A 0.612 V Output Load Current ILOAD Reference Voltage VREF Switching Frequency FSW 1.2 MHz High Side MOSFET On-Resistance RDS(ON)-HM 95 mΩ Low Side MOSFET On-Resistance RDS(ON)-LM 80 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 4. 5V ≤ VPWR ≤ 21V 0.588 3.5 VRUN = 0V, VSWITCH = 0V 0.6 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. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 4 EA8212A 21V, 2A, 1.2MHz, PWM Mode Synchronous Buck Converter Datasheet Application Circuit Diagram L1 C3 4.7uH 100nF VOUT 3.3V/2A C2 22uF R1 68KΩ 1% VPWR 4.5V~21V BOOT SWITCH PWR FBK RUN C4 (Optional) R2 15KΩ 1% C1 10uF ON OFF GND R3 1MΩ EA8212A Figure 2. Typical application circuit diagram Ordering Information Part Number Package Type Packing Information EA8212AT6R SOT-23-6 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 EA8212A 21V, 2A, 1.2MHz, PWM Mode Synchronous Buck Converter Datasheet Typical Operating Characteristics VPWR=12V, VOUT=3.3V, L1=4.7uH, C1=10uF, C2=22uF, TA=25°C, unless otherwise noted Efficiency vs. Load Current Efficiency vs. Load Current 90 90 Efficiency (%) 100 Efficiency (%) 100 80 70 60 50 40 80 70 60 50 40 30 VPWR = 5V VPWR = 12V VOUT = 3.3V 30 20 10 100 ILOAD (mA) 1000 10 100 ILOAD (mA) 1000 Line Regulation 3.330 3.325 3.325 3.320 3.320 3.315 3.315 VOUT (V) VOUT (V) Load Regulation 3.330 3.310 3.305 3.310 3.305 3.300 3.300 3.295 3.295 3.290 3.290 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 ILOAD (A) CH2: VOUT(AC) CH3: VSWITCH 6 9 12 15 18 VIN (V) CH4: ILOAD Light Load Output Ripple Waveform Ver. 1.0 VPWR = 12V VOUT 5V 20 CH2: VOUT(AC) CH3: VSWITCH CH4: ILOAD Heavy Load Output Ripple Waveform Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 6 EA8212A Datasheet 21V, 2A, 1.2MHz, PWM Mode Synchronous Buck Converter Typical Operating Characteristics VPWR=12V, VOUT=3.3V, L1=4.7uH, C1=10uF, C2=22uF, TA=25°C, unless otherwise noted CH1: VIN CH2: VOUT CH4: ISWITCH CH1: VIN CH2: VOUT CH4: ISWITCH VIN Power On Waveform (ILOAD=0A) CH1: VEN CH2: VOUT CH3: VSWITCH CH4: ILOAD VEN Power On Waveform (ILOAD=0A) CH2: VOUT(AC) CH4: ILOAD 0A~2A Transient Waveform 7 VIN Power On Waveform (ILOAD=2A) CH1: VEN CH2: VOUT CH3: VSWITCH CH4: ILOAD VEN Power On Waveform (ILOAD=2A) CH2: VOUT(AC) CH4: ILOAD 0.2A~1.8A Transient Waveform Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8212A 21V, 2A, 1.2MHz, PWM Mode Synchronous Buck Converter Datasheet Application Information Enable Control The EA8212A use RUN pin to control the regulator turns on / turns off. When the RUN pin input voltage is higher than 2V, the EA8212A enters the operating mode. Drive the RUN pin input voltage lower than 0.4V to ensure the EA8212A into shutdown mode. Don’t leave the RUN pin in the floating state, connect RUN pin to ground with a 1MΩ resistor for weak pull-down, as shown in Figure3. When the device works in the shutdown mode, the shutdown supply current is less than 1uA. The EA8212A 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 EA8212A will enter operating mode automatically. VPWR 4.5V~21V VPWR 4.5V~21V PWR RUN GND C1 10uF PWR R4 150KΩ C1 10uF RUN ON OFF R3 1MΩ GND R3 1MΩ EA8212A EA8212A Figure 3. Enable control by RUN pin voltage Figure 4. Automatic startup application circuit Output Voltage Setting The EA8212A 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 The following table lists common output voltage and the corresponding R1, R2 resistance value for reference. Output Voltage R1 Resistance R2 Resistance Tolerance 5V 56KΩ 7.5KΩ 1% 3.3V 68KΩ 15KΩ 1% 1.8V 30KΩ 15KΩ 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. 1.0 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 8 EA8212A 21V, 2A, 1.2MHz, PWM Mode 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 EA8212A. 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 EA8212A 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. 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 EA8212A PWR C1 R4 RUN GND R3 * Bold lines indicate high current paths 9 Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. Ver. 1.0 EA8212A 21V, 2A, 1.2MHz, PWM Mode 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. 1.0 Symbol Copyright © 2016 Everanalog Integrated Circuit Limited. All Rights Reserved. 10