DIODES AP63356-EVM 3.8v To 32v Input 3.5a Low Iq Synchronous Buck Owner’s Manual

DIODES AP63356-EVM 3.8v To 32v Input 3.5a Low Iq Synchronous Buck Owner’s Manual

DESCRIPTION

The AP63356 is a 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 32V. The device fully integrates a 74mΩ high-side power MOSFET and a 40mΩ low-side power MOSFET to provide highefficiency step-down DC-DC conversion.

The AP63356 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network.

The AP63356 design is optimized for Electromagnetic Interference (EMI) reduction.

FEATURES

• VIN 3.8V to 32V
• 3.5A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 22µA Ultralow Quiescent Current (Pulse FrequencyModulation)
• 450kHz Switching Frequency
• Pulse Width Modulation (PWM) Regardless of Output Load
• Proprietary Gate Driver Design for Best EMI Reduction

APPLICATIONS

• 5V, 12V, and 24V Distributed Power Bus Supplies
• Flat Screen TV Sets and Monitors
• Power Tools and Laser Printers
• White Goods and Small Home Appliances
• FPGA, DSP, and ASIC Supplies
• Home Audio
• Network Systems
• Gaming Consoles
• Consumer Electronics
• General Purpose Point of Load

The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET tur non and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP63356 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time

The device is available in a 3mm × 2mm V-DFN3020-13 package.

• Frequency Spread Spectrum (FSS) to Reduce EMI
• Power Good Indicator with 5M Internal Pull-up
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry
• Undervoltage Lockout (UVLO)
• Output Undervoltage Protection (UVP)
• Cycle-by-Cycle Peak Current Limit
• Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

FUNCTIONAL BLOCK

Figure 1. Functional Block Diagram

ABSOLUTE MAXIMUM RATINGS

-0.3 to +40.0 (400ms)
VEN| Enable/UVLO Pin Voltage| -0.3 to +35.0| V
VFB| Feedback Pin Voltage| -0.3 to +6.0| V
VCOMP| Compensation Pin Voltage| -0.3 to +6.0| V
VPG| Power-Good Pin Voltage| -0.3 to +6.0| V
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VSW| Switch Pin Voltage| -0.3 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
TST| Storage Temperature| -65 to +150| °C
TJ| Junction Temperature| +170| °C
TL| Lead Temperature| +260| °C
ESD Susceptibility
HBM| Human Body Mode| 2000| V
CDM| Charge Device Model| 1000| V

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP63356-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP63356, follow the procedure below:

1. For evaluation board configured at VOUT = 5V, connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, place a jumper to “H” position to enable IC. Jump to “L” position to disable IC.
4. The evaluation board should now power up with a 12V output voltage.
5. Check for the proper output voltage of 5V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND.
6. Set the load to 3.5A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency

MEASUREMENT/PERFORMANCE GUIDELINES

1. When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
2. For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current

Setting the Output Voltage of AP63356

1. Setting the output voltage

The AP63356 features external programmable output voltage by using a resistor divider network R5 and R6 as shown in the typical application circuit. The output voltage is calculated as below

V=0.8x (Rs+Rs)
Rs
out

First, select a value for R6 according to the value recommended in the table

1. Then, R5 is determined. The output voltage is given by Table 1 for reference. For accurate output voltage, 1% tolerance is required

Table 1. Resistor selection for output voltage setting

EXTERNAL COMPONENT SELECTION:

1. Input & output Capacitors (Cin, Cout)
2. For lower output ripple, low ESR is required.
3. Low leakage current needed, X5R/X7R ceramic recommend, multiple capacitor parallel connection.
4. The Cin and Cout capacitances are greater than 10μF and 44μF respective. When output voltage is set to 1.0V, 66μF Cout is recommended.
5. Bootstrap Voltage Regulator
6. An external 0.1μF ceramic capacitor is required as bootstrap capacitor between BST and SW pin to work as high side power MOSFET gate driver.
7. Compensation Capacitors and Resistors
8. For internal compensation: Connect Comp Pin to GND directly;
9. For external compensation: A resistor and a capacitor in series are connected from Comp Pin to GND, the value of resistor and capacitor is recommended refer to below table.
   Output capacitor(μF)| Vo = 3.3V| Vo = 5.0V| Vo = 1.0V/12V
   ---|---|---|---
   R7(KΩ)| C6(nF)| R7(KΩ)| C6(nF)| R7(Ω)| C6(nF)
   44| 25| 3.3| 24| 3.3| Internal compensation Recommended
   66| 25| 3.3| 36| 3.3| Internal compensation Recommended
10. Inductor (L)
11. Low DCR for good efficiency
12. Inductance saturate current must higher than the output current
13. The recommended inductance is shown in the table 2 below

Table 2. Recommended inductors

EVALUATION BOARD SCHEMATIC
Figure 2. Typical Application Circuit

PCB TOP LAYOUT
Figure 3. AP63356-EVM – Top Layer

PCB BOTTOM LAYOUT
Figure 4. AP63356-EVM – Bottom Layer

BILL OF MATERIALS for AP63356-EVM (VOUT = 5V)

TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. Efficiency vs. Output Current for AP63356

Figure 6. AP63356 Output Voltage Ripple, VIN = 12V, VOUT = 5V IOUT = 50mA

Figure 7. AP63357 Output Voltage Ripple, VIN = 12V, VOUT = 5V IOUT = 50mA

Figure 7. AP63357 Output Voltage Ripple, VIN = 12V, VOUT = 5V IOUT = 50mA

IMPORTANT NOTICE

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2. The Information contained herein is for informational purpose only and is provided only to illustrate he operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users  who design with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which incorporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality control techniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications.
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AP63356
Rev. 1 11 of 11
www.diodes.com
September 2023
© 2023 Copyright Diodes Incorporated. All Rights Reserved.

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