DIODES AP64200QSP Buck Converter User Guide

DIODES AP64200QSP Buck Converter

Product Information

Specifications

• Input Voltage Range: 3.8V to 40V
• Output Current: 2A

FAQ

• Q: What is the recommended input voltage range for the AP64200Q?
  • A: The recommended input voltage range is from 3.8V to 40V.
• Q: How can I enable or disable the IC on the evaluation board?
  • A: To enable the IC, place a jumper at JH6 to the ON position. To disable, leave it OPEN.
• Q: What is the typical output voltage of the evaluation board?
  • A: The evaluation board typically outputs a voltage of 5.0V.

DESCRIPTION AND FEATURES

DESCRIPTION

The AP64200Q is 2A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 150mΩ high-side power MOSFET and an 80mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. The AP64200Q device is easily used by minimizing the external component count due to its adoption of peak current mode control.

The AP64200Q design is optimized for Electromagnetic Interference (EMI) reduction. The converter 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. It also 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 device is available in a SO-8EP package.

FEATURES

• Qualified for Automotive Applications
• Wide Input Range: 3.8V to 40V
• 2A Continuous Output Current
• 0.8V ±1% Reference Voltage
• 25μA Ultralow Quiescent Current (Pulse Frequency Modulation)
• Adjustable Switching Frequency: 100kHz to 2.2MHz
• External Clock Synchronization: 100kHz to 2.2MHz
• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• Low-Dropout (LDO) Mode
• Precision Enable Threshold to adjust UVLO
• Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

TYPICAL APPLICATIONS CIRCUIT

ABSOLUTE MAXIMUM RATINGS

-0.3 to +45.0 (400ms)
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +42.0| V
VRT/CLK| RT/CLK Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Voltage| -0.3V to +6.0| V
VCOMP| Compensation Pin Voltage| -0.3 to +6.0| V
VSW| Switch Node Voltage| -0.3 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP64200QSP-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP64200QSP, follow the procedure below:

1. 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, to enable IC, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ resistor or leave it OPEN. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 5.0V output voltage.
5. Check for the proper output voltage of 5.0V (±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 2A 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 OUTPUT VOLTAGE:

Table 1 shows a list of recommended component selections for common output voltages.

Table 1. Common Output Voltages

VOUT| R1| R2| L1| R7| C7| C1, C2| C5, C6| C10
---|---|---|---|---|---|---|---|---
1.2V| 4.99KΩ| 10KΩ| 3.3µH| 3.32 KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
1.5V| 8.66KΩ| 10KΩ| 4.7µH| 4.22KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
1.8V| 12.4KΩ| 10KΩ| 4.7µH| 4.99KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
2.5V| 21.5KΩ| 10KΩ| 6.8µH| 6.98KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
3.3V| 31.6KΩ| 10KΩ| 6.8µH| 9.31KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
5.0V| 52.3KΩ| 10KΩ| 10µH| 14KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN
12V| 140KΩ| 10KΩ| 22µH| 22.1KΩ| 5.6nF| 2×10µF| 2×22µF| OPEN

EVALUATION BOARD SCHEMATIC

LAYOUTS

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS

BILL OF MATERIALS for AP64200QSP-EVM for VOUT=5V

Ref

| ****

Value

| ****

Description

| ****

Qty

| ****

Size

| ****

Vendor Name

| ****

Manufacturer PN

| PCB

Layer

---|---|---|---|---|---|---|---
C1, C2| 10µF| Ceramic Capacitor, 50V| 2| 1206| TDK| CGA5L1X7R1H106K160 AC| Top
C3, C4, C9| 0.1µF| Ceramic Capacitor, 50V| 3| 0603| TDK| CGA3E3X8R1H104K08 0AB| Top
C5, C6| 22µF| Ceramic

Capacitor, 16V

| 2| 1210| TDK| CGA6P1X8L1C226M25

0AC

| Top
C7| 5.6nF| Ceramic Capacitor, 50V| 1| 0603| TDK| CGA3E2NP01H562J080 AA| Top
R1| 52.3KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF5232V| Top
R2| 10KΩ| SMD Resistor,

1%

| 1| 0603| Panasonic| ERJ-3EKF1002V| Top
R3| 0Ω| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3GEY0R00V| Top
R4| 100KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1003V| Top
R6| 200KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-S03F2003V| Top
R7| 14KΩ| RES SMD 1%

1/10W

| 1| 0603| Panasonic| ERJ-3EKF1402V| Top
L1| 10µH| DCR=33mΩ, Ir=3.5A| 1| 7.0×6.9x

5mm

| Wurth Electronics| 744314101| Top
JH6|  | PCB Header, 36 POS| 1| 1X3| Amphenol| 78511-136HLF| Top
VIN, VOUT, GNDx2| ****

1598

| Terminal Turret Triple 0.094″ L (Test Points)| ****

4

| ****

Through

-Hole

| ****

Keystone Electronics

| ****

1598-2

| ****

Top

U1

| ****

AP64200Q

| Sync DC-DC Converter| ****

1

| ****

SO-8EP

| Diodes

Incorporated (Diodes)

| ****

AP64200QSP

| ****

Top

TYPICAL PERFORMANCE CHARACTERISTICS

IMPORTANT INFORMATION

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