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Peak 12A, 6.5V, 460kHz Synchronous Step-Down Converter Evaluation Board

EVB_RTQ2158AGQWTF-QA

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The RTQ2158A is a high-performance, synchronous step-down converter that can deliver up to peak 12A output current with an input supply voltage range of 2.85V to 6.5V. This document explains the function and use of the RTQ2158A evaluation board (EVB), and provides information to enable operation, modification of the evaluation board, bill of materials and schematic to meet individual requirements.

General Description

The RTQ2158A is a high-performance, synchronous step-down converter that can deliver up to peak 12A output current with an input supply voltage range of 2.85V to 6.5V. This document explains the function and use of the RTQ2158A 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 RTQ2158A Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2158A Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

2.85

--

6.5

V

Output Current

--

12

--

A

Default Output Voltage

--

1.2

--

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

  • RTQ2158AGQWT 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

Qty

Part Number

Description

Package

Manufacturer

U1

1

RTQ2158AGQWTF-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

WURTH 744314047

0.47µH

5040

WE

R1, R2

2

WR06X1003FTL

100k

0603

WALSIN

R3

1

WR06X20R0FTL

20

0603

WALSIN

R5, R6

2

RAT030000FTP

0

0603

RALEC

R7

1

WR06X1332FTL

13.3k

0603

WALSIN

R8

1

WR06X2002FTL

20k

0603

WALSIN

R9, R10, R11, R12

4

WR06X1002FTL

10k

0603

WALSIN



Typical Applications

EVB Schematic Diagram

RTQ2158AGQWTF-QA demo board: VIN = 5V, VOUT 1.2V / 12A

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 6A Load Step, VOUT = 2.5V

Technical Document Image Preview

Technical Document Image Preview

Start-Up Measurement from Enable:

EN Pin Low to High

Power-Off Measurement from Enable:

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 2023/12/07
Bill of Materials 2023/12/07
Schematic 2023/12/07
Schematic 2023/12/07
RTQ2158A-QA
RTQ2158A-QA

RTQ2158A 是峰值負載能力高達 12A 的高性能 ACOT® 架構同步 Buck 轉換器,可輸入電壓範圍為 2.85V~6.5V,集成有低 RDS(ON) MOSFET 功率開關、0.6V 高精度參考電壓源和自舉二極體,構成了一個結構緊湊的電源解決方案。
RTQ2158A 因採用改進型固定導通時間(ACOT®)控制架構而具有超快的瞬態回應速度,外部元件數量少,在整個輸入、負載和輸出電壓範圍內的穩態工作頻率都保持基本恒定,易於進行 EMI 濾波器設計。
它具有獨立的使能控制輸入和 Power Good 指示輸出,方便進行時序控制。為便於進行啟動期間的衝擊電流控制,它帶有通過一隻外接電容即可進行軟啟動時間調節的 SS 端子。它還具有完善的保護性功能設計,其中包括逐週期電流限制、欠壓保護、輸入欠壓鎖定保護和過熱保護功能。其封裝形式為熱性能良好的 WET-WQFN-21L 4x4 (FC)。

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