DIODES AP63356QZV-EVM Evaluation Boards User Guide

DIODES AP63356QZV-EVM Evaluation Boards

Specifications

• Model: AP63356QZV-EVM
• Type: Automotive-compliant, 32V, 3.5A Low IQ Synchronous Buck Converter
• Input Voltage Range: 3.8V to 32V
• Output Current: 3.5A
• Package Type: V-DFN302013/SWP (Type A1)

Description

The AP63356Q is an automotive-compliant, 3.5A, synchronous buck converter designed for high-efficiency step-down DC-DC conversion. It features a wide input voltage range of 3.8V to 32V and integrates a 74m high-side power MOSFET and a 40m low-side power MOSFET. The device adopts peak current mode control and has an integrated compensation network, allowing for the minimal external component count.

Features

• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• Low-Dropout (LDO) Mode
• Power Good Indicator with 5M Internal Pull-up
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry:
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Output Undervoltage Protection (UVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. Green Device

Applications

• 12V Automotive Power Systems
• Automotive Infotainment
• Automotive Instrument Clusters
• Automotive Body Electronics and Lighting
• Automotive Telematics
• Advanced Driver Assistance Systems

FAQ

Frequently Asked Questions

• Q: What is the input voltage range of the AP63356Q?
  • A: The AP63356Q has a wide input voltage range of 3.8V to 32V.
• Q: What are the protection features of the AP63356Q?
  • A: The AP63356Q has the following protection features:
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Output Undervoltage Protection (UVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Q: What are the recommended applications for the AP63356Q?
  • A: The AP63356Q is suitable for various automotive applications, including:
  • 12V Automotive Power Systems
  • Automotive Infotainment
  • Automotive Instrument Clusters
  • Automotive Body Electronics and Lighting
  • Automotive Telematics
  • Advanced Driver Assistance Systems

DESCRIPTION

The AP63356Q is an automotive-compliant, 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 32V and fully integrates a 74mΩ high- side power MOSFET and a 40mΩ low-side power
MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP63356Q device is easily used by minimizing the external component count due to its adoption of peak current mode control along with the integrated compensation network

The AP63356Q is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. The AP63356Q 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.

The device is available in a 3mm x 2mm, V-DFN3020- 13/SWP (Type A1), package with wettable flanks.

FEATURES

• AEC-Q100 Qualified with the Following Results
  • Device Temperature Grade 1: -40°C to 125°C

TA Range

• Device HBM ESD Classification Level H1C
• Device CDM ESD Classification Level C3B
  • VIN 3.8V to 32V
  • 3.5A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 450kHz Switching Frequency
  • Pulse Width Modulation (PWM) Regardless of Output Load
• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• Low-Dropout (LDO) Mode
• Power Good Indicator with 5MΩ Internal Pull-up
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Output Undervoltage Protection (UVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

APPLICATIONS

• 12V Automotive Power Systems
• Automotive Infotainment
• Automotive Instrument Clusters
• Automotive Body Electronics and Lighting
• Automotive Telematics
• Advanced Driver Assistance Systems

FUNCTIONAL BLOCK

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| -1.0 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 AP63356QZV-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP63356Q, follow the procedure below:

1. For the 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 the negative terminal to GND.
3. For Enable, place a jumper in the “H” position to enable IC. Jump to the “L” position to disable IC.
4. The evaluation board should now power up with a 5V 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 AP63356Q

Setting the output voltage:
The AP63356Q 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,

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 and output Capacitors (Cin, Cout):
2. For lower output ripple, low ESR is required.
3. Low leakage current needed, X5R/X7R ceramic recommended multiple capacitor parallel connection.
4. The Cin and Cout capacitances are greater than 10μF and 44μF respectively. When the 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 a bootstrap capacitor between BST and SW pins to work as a 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 the resistor and capacitor is recommended refer to the below table.

Inductor (L):

1. Low DCR for good efficiency
2. The inductance saturate current must be higher than the output current
3. The recommended inductance is shown in Table 2 below

Table 2. Recommended inductors

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP63356QZV-EVM (VOUT=5V)

Item

| ****

Value

| ****

Type

| ****

Rating

| ****

Description

---|---|---|---|---
C2| 10µF| X7R, Ceramic/1206| 35V| TDK

CGA5L1X7R1V106K160AC

C3| 0.1µF| X8R, Ceramic/0603| 50V| TDK

CGA3E3X8R1H104K080AB

C4| 0.1µF| X8R, Ceramic/0603| 50V| TDK

CGA3E3X8R1H104K080AB

C6| 3.3nF| X7R, Ceramic/0603| 50V| TDK

CGA3E2X7R1H332K080AA

C8, C9, C10| 22µF| X7R, Ceramic/1206| 10V| TDK

CGA5L1X7S1A226M160AC

L1| 6.8µH| 6060| 6.5A| Würth PART 744 393 460 68
R1| 100K| 0603| 1%| Enable RES
R4| 0| 0603| 1%| Bootstrap RES
R5| 157K| 0603| 1%| Voltage set RES*
R6| 30K| 0603| 1%
R7| 36K| 0603| 1%| Comp RES
U1| | AP63356Q| | QFN

TYPICAL PERFORMANCE CHARACTERISTICS

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December 2023
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