DIODES AP63357QZV-EVM Automotive Compliant 3.5A Buck Converter Instruction Manual

DIODES AP63357QZV-EVM Automotive Compliant 3.5A Buck Converter

Product Information

Specifications

• Product Name: AP63357QZV-EVM
• Type: Automotive-compliant, 32V, 3.5A Low IQ Synchronous Buck Converter
• Input Voltage Range: 3.8V to 32V
• Integrated Components: 74m highside power MOSFET, 40m low-side power MOSFET
• Control Method: Peak current mode control
• Switching Frequency: 450kHz
• Efficiency: Up to 80% at 1mA Light Load, Up to 87% at 5mA Light Load
• EMI Reduction: Proprietary gate driver design, Frequency Spread Spectrum (FSS)
• Protection Circuitry: Undervoltage Lockout (UVLO), Output Overvoltage Protection (OVP), Output Undervoltage Protection (UVP), Cycle-by-Cycle Peak Current Limit, Thermal Shutdown
• Compliance: AEC-Q100 Qualified, RoHS Compliant

Applications

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

Functional Block Diagram

Absolute Maximum Ratings

Recommended Operating Conditions

Evaluation Board

FAQ

1. What is the input voltage range for the AP63357QZV-EVM?
   The input voltage range for the AP63357QZV-EVM is 3.8V to 32V.

2. What is the switching frequency of the buck converter?
   The switching frequency of the buck converter is 450kHz.

3. Is the AP63357QZV-EVM compliant with automotive standards?
   Yes, the AP63357QZV-EVM is automotive-compliant.

4. What kind of protection circuitry does the AP63357QZV-EVM have?
   The AP63357QZV-EVM has various protection features including undervoltage lockout (UVLO), output overvoltage protection (OVP), output undervoltage protection (UVP), cycle-by-cycle peak current limit, and thermal shutdown.

DESCRIPTION

• The AP63357Q 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 highside power MOSFET and a 40mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.
• The AP63357Q 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 AP63357Q 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. AP63357Q 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/SWP (Type A1), package with wettable flanks.

FEATURES

• AEC-Q100 Qualified with the Following Results
  • Device Temperature Grade 1: -40C to 125C 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
• 22µA Ultralow Quiescent Current (Pulse Frequency Modulation)
• 450kHz Switching Frequency
• Supports Pulse Frequency Modulation (PFM)
  • Up to 80% Efficiency at 1mA Light Load
  • Up to 87% Efficiency at 5mA Light Load
• 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
  • Under voltage 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 AP63357QZV-EVM has a simple layout and allows access to the appropriate signals through test points.

To evaluate the performance of the AP63357Q, 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 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 AP63357Q

Setting the output voltage:

• The AP63357Q 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 & 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.

Table 2. Recommended Capacitors and Resistors

Inductor (L):

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

Table 3. Recommended Inductors

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP63357QZV-EVM (VOUT=5V)

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| | AP63357Q| | QFN

TYPICAL PERFORMANCE CHARACTERISTICS

AP63357QZV-EVM
AUTOMOTIVE-COMPLIANT, 32V, 3.5A LOW IQ SYNCHRONOUS BUCK CONVERTER

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December 2023
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