DIODES AP61302QZ6-EVM 2.3v To 5.5v Input 3a Synchronous Buck Converter Owner’s Manual

AP61302QZ6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Description

The DIODES AP61302Q is a 3A, synchronous buck converter with an input voltage range of 2.4V to 5.5V and fully integrates a 70mΩ highside power MOSFET and a 50mΩ low-side power MOSFET to provide high-efficiency step- down DC-DC conversion.
The AP61302Q device is easily used by minimizing the external component count due to its adoption of constant on-time (COT) control to achieve fast transient responses, ease loop stabilization, and low output voltage ripple. Moreover, AP61302Q also features force PWM mode control through EN pin.
The device is available in a SOT563 package.

Pin Assignments

Features

• Input Range: 2.4V to 5.5V

• Wide Output Voltage Range: 0.6V to VIN

• 3A Continuous Output Current

• 0.6V ± 2% Reference Voltage

• 19µA Ultralow Quiescent Current (Pulse Frequency Modulation)

• 2.2MHz Switching Frequency

• Programmable Modulation Mode Through EN
  o PFM (Vin –VEN < 200mV)
  o PWM Regardless of Output Load ( Vin –VEN > 200mV )

• Protection Circuitry
  o Undervoltage Lockout (UVLO)
  o VIN Overvoltage Protection (OVP)
  o Peak Current Limit
  o Valley Current Limit
  o Thermal Shutdown

Applications

• 5V Input Distributed Power Bus Supplies
• White Goods and Small Home Appliances
• FPGA, DSP, and ASIC Supplies
• Network Video Cameras
• Wireless Routers
• Consumer Electronics
• General Purpose Point of Load

Functional Block

Absolute Maximum Ratings (Note 1) (At TA = +25°C, unless otherwise specified.)

-0.3 to + 7.0 (400ms)
VFB| Feedback Pin Voltage| -0.3 to VIN + 0.3| V
VSW| Switch Pin Voltage| -1.0 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
VEN| Enable Pin Voltage| -0.3 to VIN + 0.3| V
TST| Storage Temperature| -65 to +150| °C
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C
ESD Susceptibility (Note 2)
HBM| Human Body Model| 6000| V
CDM| Charged Device Model| 1500| V

Notes:

1. Stresses greater than the Absolute Maximum Ratings specified above may cause permanent damage to the devic e. These are stress ratings only; functional operation of the device at these or any other conditions exceeding  those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.
2. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be take n when handling and transporting these devices.

Recommended Operating Conditions (At TA = +25°C, unless otherwise specified.)

Quick Start Guide

The AP61302QZ6-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP61302QZ6, follow the procedure below:

1. For evaluation board configured at VOUT=1.8V, connect a power supply to the input terminals VIN and GND. Set VIN to 5V.
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 1.8V output voltage.
5. Check for the proper output voltage of 1.8V (±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 3A 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. Test the input capacitor voltage and output capacitor  oltage with a multimeter as input voltage and output voltage.

Setting the Output Voltage of AP61302Q

1. Setting the output voltage

The AP61302Q features external programmable output voltage by using a resistor divider network R1 and R2 as shown in the typical application circuit. The output voltage is calculated as below, First, select a value for R2 according to the value recommended in the table 1. Then, R2 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

AP 61300QIAP61302Q

Output Voltage (V)| 111 (k0)| R2 (kO)| L (pH)| C1 (pF)| C2 (pF)| C3 (pF)
AP61300Q| AP61302Q
1.0| 200.0| 301.0| 1.0| 22| 22| OPEN| 33
1.2| 200.0| 200.0| 1.0| 22| 22| OPEN| 33
1.5| 200.0| 133.0| 1.0| 22| 22| OPEN| 33
1.8| 200.0| 100.0| 1.0| 22| 22| OPEN| 33
2.5| 200.0| 63.| 1.0| 22| 22| OPEN| 33
3.5| 200.0| 44.2| 1.0| 22| 22|  OPEN| 33

Evaluation Board Schematic

PCB Top Layout

PCB Bottom Layout

EV Board View Bill of Materials for AP61302QZ6-EVM (VOUT=1.8V)

EMK212ABJ106KD-T
C3| 22uF| X5R/X7R, Ceramic/0805| 10V| Output coupling CAP| TAIYO YUDEN
EMK212ABJ106KD-T
L| 1.0uH| SMD| >5A| Inductor| WURTH ELEC
744316100
R1| 200K| 0805| 1%| *** Voltage set RES|
R2| 100K| 0805| 1%|
R3| 100K| 0805| 1%| EN RES*|
R4| 100K| 0805| 1%| PG RES|
U1| | AP61302Q| | SOT563| Diodes BCD

Typical Performance Characteristics

IMPORTANT NOTICE

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2. The Information contained herein is for informational purpose only and is provided only to illustrate the 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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Issue 1 – March, 2023
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