loading
Richtek

12A, 17V Synchronous Step-Down Converter

EVB_RTQ2822AGQVF

Share
ACTIVE

This document explains the function and use of the RTQ2822A evaluation board (EVB), the RTQ2822A is a high-performance, synchronous step-down converter that can deliver up to 12A output currentvwith an input supply voltage range of 4.5V to 17V. The device integrates low RDS(ON) power MOSFETs, accurate 0.6V reference and an integrated diode for bootstrap circuit to offer a very compact solution. This document explains the function and use of the RTQ2822A evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to meet individual requirements.

General Description

This document explains the function and use of the RTQ2822A evaluation board (EVB), the RTQ2822A is a high-performance, synchronous step-down converter that can deliver up to 12A output currentvwith an input supply voltage range of 4.5V to 17V. The device integrates low RDS(ON) power MOSFETs, accurate 0.6V reference and an integrated diode for bootstrap circuit to offer a very compact solution. This document explains the function and use of the RTQ2822A evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to meet individual requirements.



Performance Specification Summary

Summary of the RTQ2822AGQVF Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2822AGQVF Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Default Input Voltage

Default = 12V

4.5

12

17

V

Output Voltage

Default = 1.2V

0.6

--

5.5

V

Maximum Output Current

--

--

12

A

Operation Frequency

Default = 800kHz

400

800

1200

kHz

Soft-Start Time

CSS = 47nF

--

4.7

--

ms



Power-up Procedure

Suggestion Required Equipments

  • DC Power Supply (Chroma, 62006P-100-25)
  • Electronic load capable of 30A
  • Four Channels Digital Real-Time Oscilloscope
  • Display Multi-meter (34405A)

Power-up & Measurement Procedure

1. Apply a 12V nominal input power supply (4.5V < VIN < 17V) to the VIN and GND terminals.

2. Set the jumper at JP1 to connect terminals H and EN, connecting EN to VIN through resistor R18 (100kΩ). The Enable pin can connected to VIN directly as well to enable operation.

3. Set the jumper at JP2 to connect terminals H and PGOOD, Connenting VCC to H through resistor RPGOOD (100kΩ).

4. Verify the output voltage (approximately 1.2V) between VOUT and GND.

5. Connect an external load up to 12A to the VOUT and GND terminals and verify the output voltage and current.



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 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.


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

MODE

Current limit, switching frequency, and light load operation mode selection pin.

BOOT

Bootstrap

SW

Switch node

PGND

Power ground

VIN

Input voltage

VCC

4.7V internal LDO output

AGND

Analog GND

PGOOD

Power good indicator output

SS

Soft-start time control pin



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacturer

U4

1

RTQ2822AGQVF

Step-Down

DC-DC Converter

VQFN-18L

3.5x3.5 (FC)

RICHTEK

C1, C2,

C7, C15

4

0603B104K500CT

0.1μF, 50V, X7R

0603

WALSIN

C3, C4,

C5, C6

4

GRM21BR61E226ME44L

22μF, 25V, X5R

0805

MURATA

C11, C12, C13, C14

4

GRM32ER61C476KE15L

47μF, 16V, ±20%, X5R,

1210

MURATA

C16

1

0603N101J500CT

100pF, 50V, NPO

0603

MURATA

C17

1

GRM188R71C473KA01

0.047μF, 16V, ±10%, X7R

0603

MURATA

C19

1

GRM185R61A475KE11

4.7μF, 10V, ±20%, X5R

0603

TDK

L1

1

744311068

0.68µH, RDC = 3.1mΩ

7.0x7.0x4.0

WURTH ELEKTRONIK

R1, R14

R16

3

WR06X000 PTL

RES, 0, 1%, 0.1W

0603

WALSIN

R13, R17

2

WR06X1002FTL

RES, 10k, 1%, 0.1W

0603

WALSIN

R18, R19

RPGOOD1

3

WR06X1003FTL

RES, 100k, 1%, 0.1W

0603

WALSIN

RMODE1

1

WR06X1203FTL

RES, 120k, 1%, 0.1W

0603

WALSIN

RMODE2

1

WR06X2002FTL

RES, 20k, 1%, 0.1W

0603

WALSIN



Typical Applications

EVB Schematic Diagram

RTQ2822A demo board: VIN = 12V, VOUT 1.2V / 12A

Technical Document Image Preview


Note:

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 than specified.

3. Set default soft start time 5ms by connecting C17 to 47nF.


Measurement Results

Output Ripple Measurement

Output Ripple Measurement

Technical Document Image Preview

Technical Document Image Preview

Output ripple at 10mA load: 32mVpp

Output ripple at 12A load: 10mVpp

Output Ripple Measurement

Output Ripple Measurement

Technical Document Image Preview

Technical Document Image Preview

Output ripple at 10mA load: 27mVpp

Output ripple at 12A load: 10mVpp

Dynamic Load 0A to 10A Load Step (DCM Mode)

Dynamic Load 0A to 10A Load Step (DCM Mode)

Technical Document Image Preview

Technical Document Image Preview

VPK-PK: 112mV

VPK-PK: 344mV

Start-Up Measurement from Enable

Power-Off Measurement from Enable

Technical Document Image Preview

Technical Document Image Preview

Start-up time 5ms. Soft-start 5ms.

VOUT discharge during power-off

Start-Up Measurement from VIN

Power-Off Measurement from VIN

Technical Document Image Preview

Technical Document Image Preview

Start-up time 2.7ms. Soft-start 1.575ms.

VOUT discharge during power-off.


Thermal Image: 800kHz, PWM mode

IC Top Temperature = 77.5°C

on VIN = 12V, VOUT = 1.2V, IOUT = 12A

IC Top Temperature = 98.2°C

on VIN = 12V, VOUT = 2.5V, IOUT = 12A

Technical Document Image Preview

Technical Document Image Preview



Evaluation Board Layout

Figure 1 to Figure 4 are RTQ2822AGQVF Evaluation Board layout.

一張含有 文字, 電子產品, 螢幕擷取畫面 的圖片

自動產生的描述

Figure 1. Top View (1st layer)


一張含有 文字, 電子產品 的圖片

自動產生的描述

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


一張含有 文字, 電子產品 的圖片

自動產生的描述

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


一張含有 文字, 電子產品 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 2023/05/23
Bill of Materials 2023/05/23
Schematic 2023/05/23
Gerber File 2023/05/23
RTQ2822A/RTQ2822B
RTQ2822A/RTQ2822B

RTQ2822A/B 是具有 12A 电流负载能力的高性能同步 Buck 转换器,可在 4.5V-17V 输入电压范围内工作,集成有低 RDS(ON) MOSFET 功率开关、0.6V 高精度参考电压源和自举二极管,可形成非常紧凑的电源解决方案。
RTQ2822A/B 采用 ACOT® 改进型固定导通时间控制架构,具有超快速的瞬态响应特性,外围元件少,在整个输入、输出和负载范围内的稳态工作频率几乎恒定不变,易于设计其 EMI 滤波器。
该器件提供众多的功能以实现设计上的灵活性,具有可选择的工作频率、电流限制阈值和 PWM 工作模式,可满足多种不同应用的需求;具有独立的使能控制输入、POWER GOOD 指示输出,方便进行时序控制设计;具有通过一只外接电容即可对软启动过程进行设置的 SS,可有效控制启动期间的电流冲击;具有逐周期电流限制、OVP、UVP、输入欠压锁定和 OTP 等保护功能。
RTQ2822A/B 的封装形式是具有很好热性能的 VQFN-18L 3.5x3.5 (FC)。

Part NumberFree SampleBuy From Authorized Distributor
EVB_RTQ2822AGQVF Not available Buy from Distributor
TOP