DIODES AP61302QZ6-EVM 3A Synchronous Buck Converter Owner’s Manual

: July 30, 2024
: DIODES

DIODES AP61302QZ6-EVM 3A Synchronous Buck Converter

Specifications

Supply Voltage: 2.4V to 5.5V
Output Voltage: 0.6V to VIN
Operating Ambient Temperature Range: -40°C to +125°C
Operating Junction Temperature Range: -40°C to +150°C

Product Information

The DIODES AP61302Q is a 3A, synchronous buck converter designed for an input voltage range of 2.4V to 5.5V. It features a high-efficiency step-down DC-DC conversion with integrated power MOSFETs and constant on-time (COT) control for fast transient responses.

Pin Assignments

The AP61302Q device is user-friendly with minimal external component requirements. It supports VIN Overvoltage Protection, Peak Current Limit, Valley Current Limit, and Thermal Shutdown features. The device also offers force PWM mode control through the EN pin.

Product Usage Instructions

Connect a power supply providing 5V to the input terminals VIN and GND on the evaluation board configured for VOUT=1.8V.
Connect the positive terminal of an electronic load to VOUT and the negative terminal to GND.
To enable the IC, place a jumper in the H position; place it in the L position to disable the IC.
The evaluation board should power up with a stable 1.8V output voltage.
Set the electronic load to draw a current of 3A and monitor the SW signal on an oscilloscope for stable operation. Measure the switching frequency.

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 high-side 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.

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
- PFM (Vin –VEN < 200mV)
  PWM Regardless of Output Load ( Vin –VEN > 200mV )
Protection Circuitry
- Undervoltage Lockout (UVLO)
- VIN Overvoltage Protection (OVP)
- Peak Current Limit
- Valley Current Limit
- Thermal Shutdown

Pin Assignments

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.)

2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Symbol	Parameter	Rating	Unit
VIN	Supply Pin Voltage	-0.3 to +6.5 (DC)	V

Notes

Stresses greater than the Absolute Maximum Ratings specified above may cause permanent damage to the device. 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.
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.)

Symbol	Parameter	Min	Max	Unit
VIN	Supply Voltage	2.4	5.5	V
VOUT	Output Voltage	0.6	VIN	V
TA	Operating Ambient Temperature Range	-40	+125	°C
TJ	Operating Junction Temperature Range	-40	+150	°C

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:

For evaluation board configured at VOUT=1.8V, connect a power supply to the input terminals VIN and GND. Set VIN to 5V.
Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
For Enable, place a jumper to “H” position to enable IC. Jump to “L” position to disable IC.
The evaluation board should now power up with a 1.8V output voltage.
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.
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

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.
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 voltage with a multimeter as input voltage and output voltage.

Setting the Output Voltage of AP61302Q

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

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

Evaluation Board Schematic

PCB Top Layout

PCB Bottom Layout

EV Board View

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

Item

| ****

Value

| ****

Type

| ****

Rating

| ****

Description

| ****

Description

---|---|---|---|---|---
C2| 22uF| X5R/X7R,

Ceramic/0805

| 10V| Input coupling CAP| TAIYO YUDEN

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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FAQ

Q: What are some common applications for the AP61302Q?

A: The AP61302Q is commonly used in distributed power bus supplies, white goods, small home appliances, FPGA/DSP/ASIC supplies, network video cameras, wireless routers, consumer electronics, and general purpose point of load applications.

Q: How do I ensure the long-term reliability of the AP61302Q device?

A: Avoid exposing the device to stresses greater than the Absolute Maximum Ratings specified in the manual. Take suitable ESD precautions when handling and transporting the device to prevent damage from ESD events.