DIODES AP61062QZ6-EVM Buck Converter Owner’s Manual

DIODES AP61062QZ6-EVM Buck Converter

Specifications

• Input Voltage Range: 2.3V to 5.5V
• Output Current: 600mA
• Integrated high-side power MOSFET and low-side power MOSFET
• Features: Undervoltage Lockout, Overvoltage Protection, Current Limit, Thermal Shutdown
• Package : SOT563

Product Usage Instructions

Pin Assignments and Features

The AP61062Q is designed for easy use with minimal external components. It utilizes constant on-time control for fast transient responses and low output voltage ripple. The device also offers force PWM mode control through the EN pin.

Functional Block Diagram

The functional block diagram shows the internal components of the AP61062Q, including the shutdown comparator, internal soft-start, UVLO, OVP, thermal shutdown, and control logic.

Quick Start Guide

1. Connect the positive and negative leads between VOUT and GND.
2. Set the load to 600mA using an electronic load.
3. Observe the SW signal on an oscilloscope for stable operation.
4. Measure the switching frequency.

Measurement/Performance Guidelines

When measuring the output voltage ripple, ensure short ground lengths on the oscilloscope probe to avoid injecting high-frequency noise into the measurement.

FAQ

• Q: What is the input voltage range of the AP61062Q?
  • A: The input voltage range is 2.3V to 5.5V.
• Q: What are the key features of the AP61062Q?
  • A: The key features include under-voltage lockout, overvoltage protection, current limit, and thermal shutdown.
• Q: How do I measure the output voltage ripple?
  • A: Maintain short ground lengths on the oscilloscope probe to ensure accurate measurement and avoid introducing noise into the ripple measurement.

DESCRIPTION

The AP61062Q is a 600mA, synchronous buck converter with an input voltage range of 2.3V to 5.5V and fully integrates a 120mΩ highside power MOSFET and a 80mΩ low-side power MOSFET to provide high-efficiency step-down DC/DC conversion.

The AP61062Q 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, AP61062Q also features force PWM mode control through EN pin.

The device is available in a SOT563 package.

FEATURES

• Input Range: 2.3V to 5.5V
• Wide Output Voltage Range: 0.6V to 5.5V
• 600mA Continuous Output Current
• 0.6V ± 2% Reference Voltage
• 14µA 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 4) (@ 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
-3 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 5)
HBM| Human Body Model| 6000| V
CDM| Charged Device Model| 1500| V

Notes:

• 4. 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.
• 5. Semiconductor devices are ESD-sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices.

RECOMMENDED OPERATING CONDITIONS

(@ TA = +25°C, unless otherwise specified.)

QUICK START GUIDE

The AP61062QZ6-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP61062QZ6, follow the procedure below:

1. For the 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 the negative terminal to GND.
3. For Enable, place a jumper to the “H” position to enable IC. Jump to the “L” position to disable IC. 3. The evaluation board should now power up with a 1.8V output voltage.
4. 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.
5. Set the load to 600mA 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 voltage with a multimeter as input voltage and output voltage.

SETTING THE OUTPUT VOLTAGE OF AP61062Q

Setting the output voltage

The AP61062Q 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

AP61062Q

Output Voltage (V)| R1 (kΩ)| R2 (kΩ)| L (µH)| C1 (µF)| C2 (µF)| C3 (pF)
1.0| 200.0| 301.0| 1.0| 10| 10| 33
1.2| 200.0| 200.0| 1.0| 10| 10| 33
1.5| 200.0| 133.0| 1.0| 10| 10| 33
1.8| 200.0| 100.0| 1.0| 10| 10| 33
2.5| 200.0| 63.2| 1.0| 10| 10| 33
3.3| 200.0| 44.2| 1.0| 10| 10| 33

EXTERNAL COMPONENT SELECTION

Inductor (L)

1. Low DCR for good efficiency
2. Inductance saturate current must be higher than 2.5A

1.0μH inductor (WURTH ELEC744316100) is recommended for all application circuits.

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

EV BOARD VIEW

BILL OF MATERIALS for AP61062QZ6-EVM (VOUT=1.8V)

Item

| ****

Value

| ****

Type

| ****

Rating

| ****

Description

| ****

Manufacturer PN

---|---|---|---|---|---
C2| 10uF| X8L, Ceramic/0805| 10V| Input CAP| C2012X8L600mA106K125AC
C3| 10uF| X8L, Ceramic/0805| 10V| Output CAP| C2012X8L600mA106K125AC
C5| 33pF| NP0, Ceramic/0603| 100V| Feedforward CAP| C1608NP02A330J080AA

L

| ****

1.0uH

| ****

SMD

| ****

5A

| ****

Inductor

| WURTH ELEC 744316100
R1| 200K| 1%，0805| 1%| ****

Voltage set RES

| ****

–

R2| 100K| 1%，0805| 1%
R3| 100K| 1%，0805| 1%| Enable RES
R4| 100K| 1%，0805| 1%| Power Good RES
U1| –| AP61062QZ6| –| SOT563| Diodes BCD

TYPICAL PERFORMANCE CHARACTERISTICS

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

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