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8A, 6.5V, 2.1MHz Synchronous Step-Down Converter with I2C Interface Evaluation Board

EVB_RTQ2159GQWTF-QA

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The RTQ2159 is a high-performance, synchronous step-down converter that can deliver up to 8A output current with an input supply voltage range of 2.85V to 6.5V. This document explains the function and use of the RTQ2159 evaluation board (EVB), and provides information to enable operation, modification of the evaluation board, bill of materials and schematic to meet individual requirements.

Purpose

The RTQ2159 is a high-performance, synchronous step-down converter that can deliver up to 8A output current with an input supply voltage range of 2.85V to 6.5V. This document explains the function and use of the RTQ2159 evaluation board (EVB), and provides information to enable operation, modification of the evaluation board, bill of materials and schematic to meet individual requirements.



Performance Sepcification Summary

Summary of the RTQ2159 Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2159 Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

2.85

--

6.5

V

Output Current

--

8

--

A

Default Output Voltage

--

1

--

V

Operation Frequency

Output Ripple Voltage

--

460

--

kHz

IOUT = 8A

--

10

--

mVp-p

Line Regulation

IOUT = 8A, VIN = 3V to 6.5V

--

±1

--

%

Load Regulation

VIN = 5V, IOUT = 0A to 8A

--

±1

--

%

Load Transient Response

IOUT = 0A to 8A

--

±5

--

%

Maximum Efficiency

VIN = 5V, VOUT = 1.2V, IOUT = 8A

--

77

--

%



Power-up Procedure

Suggestion Required Equipment

  • RTQ2159GQWT-QA Evaluation Board
  • DC power supply capable of 10A
  • Electronic load capable of 12A
  • Function Generator
  • Oscilloscope

Quick Start Procedure

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on supplies until all connections are made. Note: When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.


Proper measurement equipment setup and follow the procedure below.

1. Turn off the power and connect the input power supply to the VIN and GND pins.

2. Turn off the power and connect the electronic load between the VOUT and the nearest GND pins.

3. Turn on the power supply at the input, ensuring that the input voltage does not exceed 5V on the Evaluation

Board.

4. Use a voltmeter to check for the proper output voltage.

5. Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency, and other performance metrics.



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 電路, 電子工程, 電子產品 的圖片

自動產生的描述

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.


Enable

To automatically start, pull the EN pin to VIN through JP2. Similarly, the converter can be shut down by shorting the EN pin to GND through JP2.


Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test Point/

Pin Name

Function

EN

Enable control input.

BOOT

Supply for high-side gate driver.

SW

Switch node.

PGND

System GND.

VIN

Support 2.85V to 6.5V input voltage.

AVCC

Internal regulator output.

AGND

Signal ground.

PGOOD

Open-drain, power-good indication output.

SS

Soft-start time control pin.

FB

Feedback input.



Bill of Materials

Reference

Count

Part Number

Description

Package

Manufacturer

U1

1

RTQ2159GQWTF-QA

Step-Down DC-DC Converter

WET-WQFN-21L 4x4 (FC)

RICHTEK

C1, C2, C9, C10, C11, C12

6

GRM187R61A226ME15

22µF/10V/X5R

0603

MURATA

C3, C5, C8

3

0603B104K500CT

100nF/50V/X7R

0603

WALSIN

C4

1

GRM188R61E475KE11D

4.7µF/10V/X5R

0603

MURATA

L1

1

744316022

0.22µH

5040

WE

R1, R2

2

WR06X1003FTL

100k

0603

WALSIN

R3

1

WR06X20R0FTL

20

0603

WALSIN

R5, R6, R7

3

RAT030000FTP

0

0603

RALEC

R8

1

WR06X2002FTL

20k

0603

WALSIN



Typical Applications

EVB Schematic Diagram

RTQ2159GQWTF-QA demo board: VIN = 5V, VOUT 1V / 8A

Technical Document Image Preview

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple.

2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.


Measurement Results

Output Ripple Measurement

at VIN = 5V 8A load, VOUT = 1V

Output Ripple Measurement

at VIN = 5V 8A load, VOUT = 2.5V

Technical Document Image Preview

Technical Document Image Preview

Dynamic Load 0A to 8A Load Step, VOUT = 1V

Dynamic Load 0A to 8A Load Step, VOUT = 2.5V

Technical Document Image Preview

Technical Document Image Preview

Start-Up Measurement from Enable:

The EN Pin Low to High

Power-Off Measurement from Enable:

The EN Pin High to Low

Technical Document Image Preview

Technical Document Image Preview



Evaluation Board Layout

一張含有 文字, 圖表, 方案, 工程製圖 的圖片

自動產生的描述

Figure 1. Top View (1st layer)


一張含有 文字, 收據, 黑與白, 圖表 的圖片

自動產生的描述

Figure 2. PCB Layout—Inner Side (2nd Layer)


一張含有 文字, 收據, 圖表, 黑與白 的圖片

自動產生的描述

Figure 3. PCB Layout—Inner Side (3rd Layer)


一張含有 文字, 寫生, 圖表, 圖畫 的圖片

自動產生的描述

Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2024/06/14
Bill of Materials 2024/06/14
Schematic 2024/06/14
Gerber File 2024/06/14
RTQ2159-QA
RTQ2159-QA

RTQ2159 是负载能力高达 8A 的高性能同步 Buck 转换器,可在 2.85V~6.5V 输入电压范围内工作,可经 I2C 接口输入 7 位 VID 编码对其输出电压在 0.6V~1.5V 范围内进行调节。
它集成了低 RDS(ON) MOSFET 功率开关、高精度参考电压源和自举二极管,形成了结构紧凑的解决方案。它所采用改进型固定导通时间(ACOT®)控制架构赋予其超快速的瞬态响应特性,减少了外部元件数量,在整个输入、负载和输出电压范围内的稳态运行频率都保持基本恒定,易于进行 EMI 滤波器设计。它以强制电流连续模式工作,可满足严格的电压调节精度需求。它带有独立的使能控制输入端和 Power Good 指示输出,易于实现时序控制。为了控制启动期间的电流冲击,它带有外接一只电容即可调节软启动时间的 SS 端子。其设计中含有完整的保护措施,其中包括逐周期电流限制、欠压保护、输入欠压锁定保护和过热保护。其封装形式为热性能良好的 WET-WQFN-21L 4x4 (FC)。

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