loading

RTQ2118A Charging Port Controller and Integrated 36V 3A Synchronous Buck Converter Evaluation Board

EVB_RTQ2118AGQVT-QA

Share
ACTIVE

The RTQ2118A provides the electrical signatures on D+/D- to support charging schemes compatible with the USB 2.0 Battery Charging Specification BC1.2 and Chinese Telecommunication Industry Standard YD/T 1591-2009. Auto-detect mode is also integrated which supports USB 2.0 Battery Charging Specification BC1.2 Dedicated Charging Port (DCP), Divider 3 mode and 1.2V shorted mode to comply with the legacy fast charging mode of mobile devices.
The RTQ2118A integrates a high efficiency, monolithic synchronous buck converter that can deliver up to 3A output current from a 3V to 36V wide range input supply and is protected from load-dump transients up to 42V.

General Description

The RTQ2118A provides the electrical signatures on D+/D- to support charging schemes compatible with the USB 2.0 Battery Charging Specification BC1.2 and Chinese Telecommunication Industry Standard YD/T 1591-2009. Auto-detect mode is also integrated which supports USB 2.0 Battery Charging Specification BC1.2 Dedicated Charging Port (DCP), Divider 3 mode and 1.2V shorted mode to comply with the legacy fast charging mode of mobile devices.

The RTQ2118A integrates a high efficiency, monolithic synchronous buck converter that can deliver up to 3A output current from a 3V to 36V wide range input supply and is protected from load-dump transients up to 42V.



Performance Specification Summary

The Automotive HV-Buck conveter has an input voltage range from 3V to 36V, and the output voltage is 5V. It can operate in forced PWM mode and PSM mode. And the current limit is implemented by RLIM for difference application. RTQ2118A is available in a WETD-VQFN-32L 5x5 package.


Table 1. RTQ2118A Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

3

--

36

V

Output Current

RLIM = 47kΩ

3.52

4

4.48

A

Default Output Voltage

Setting by the FB pin

--

5

--

V

Operation Frequency

Setting by the RT pin

300

--

2200

kHz

Output Ripple Voltage

VIN = 12V, VOUT = 5V, IOUT = 3A

--

20

--

mVp-p

Line Regulation

CCM, VIN = 6V to 19V, VOUT = 5V, IOUT = 2.4A

--

1

--

%

Load Regulation

CCM, VIN = 12V, VOUT = 5V, IOUT < 3A

--

1

--

%

Load Transient Response

VIN = 12V, VOUT = 5V, IOUT = 1.5A to 3A

-5

--

5

%

Maximum Efficiency

VIN = 9V to 19V, VOUT = 5V, IOUT = 0A to 3A

--

91

--

%



Power-up Procedure

1. Connect input voltage (3V < VIN < 36V) to the VIN pin.

2. Setting MODE and RLIM for device request.

3. To enable Buck converter by the external EN pin.

4. To connect an external load to output and verify the output voltage versus applied current.


Output Voltage Setting

The output voltage set by external feedback resistors expressed in the following equation.

Technical Document Image Preview

where the reference voltage VFB is 0.8V (typical).

The placement of the resistive divider should be as close as possible to the FB pin. For better output voltage accuracy, the divider resistors with ±1% tolerance or better should be used. The resistance of R2 is not larger than 170kΩ for noise immunity considerationis recommended .



Detailed Description of Hardware

Headers Description and Placement

一張含有 電子元件, 電子工程, 電路元件, 被動元件 的圖片

自動產生的描述

一張含有 文字, 電子產品, 電子元件, 電子工程 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

VIN

Input voltage

VBUS

Output voltage

SW

Switching node

GND

GND

DS+

Data line

DS-

Data line

CC1

Type-C configuration pin

CC2

Type-C configuration pin



Bill of Materials

Reference

Count

Part Number

Description

Package

Manufacturer

U1

1

RTQ2118AGQVT-QA

USB Type-C and Power Delivery

WETD-VQFN-32L 5x5

RICHTEK

C1, C2

2

GRM31CR61H106KA12L

10μF/50V/X7R

1210

Murata

C3, C8, CBOOT

3

C1608X7R1H104K080AA

100nF/50V/X7R

0603

TDK

C5, C6

2

CL31A226KAHNNE

22μF/25V/X5R

1210

SAMSUNG

CVCC

1

C2012X7R1A106K125AC

1μF/10V/X7R

0805

TDK

CSS

1

C1608X7R1H103K080AA

10nF/50V/X7R

0603

TDK

CCOMP1

1

0603B472K500CT

4.7nF/50V/X7R

0603

WALSIN

L1

1

1217AS-H_2R2N=P3

2.2μH/9.3A (Maximum)

8.0x8.0x4.5mm

Murata

J1

1

UAF-041RGPB-CF1066

USB Type-A

USB-4P-DIP-AL

Cherng Weei

R0, RBOOT

2

WR06X000 PTL

0

0603

WALSIN

R1

1

RTT031053FTP

105k

0603

RALEC

R2

1

RTT032002FTP

20k

0603

RALEC

R21

1

WR08X2000FTL

200

0805

WALSIN

R46, R47

2

RTT031001FTP

1k

0603

RALEC

R55

1

WR06X1002FTL

10k

0603

WALSIN

R56, REN, RMODE/ SYNC, RPG

4

WR06X1003FTL

100k

0603

WALSIN

R210

1

WR04X000 PTL

0

0402

WALSIN

RCS1, RCS2

2

TGL120610FR060P05Z

0.06

1206

EVER OHMS

RCS3

1

RTT062R00FTP

short

1206

RALEC

RRLIM

1

RTT033302FTP

33k

0603

RALEC

RRT

1

WR06X2202FTL

22k

0603

WALSIN

RCOMP

1

RTT037681FTP

7.68k

0603

RALEC

USB3

1

UP2-AH-1-T

USB Type-A

12.75x18.75x5.52mm

CUI Devices



Typical Applications

EVB Schematic Diagram

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.


Measure Result

Output Ripple Measurement

Output Ripple Measurement

一張含有 文字, 圖表, 行, 繪圖 的圖片

自動產生的描述

一張含有 文字, 圖表, 行, 繪圖 的圖片

自動產生的描述

Load Transient Response

Output Voltage vs. Output Current

一張含有 文字, 行, 圖表, 字型 的圖片

自動產生的描述

一張含有 文字, 行, 圖表, 繪圖 的圖片

自動產生的描述

Efficiency vs. Output Current

一張含有 文字, 圖表, 行, 繪圖 的圖片

自動產生的描述


Note: When measuring the input or 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 directly across the output capacitor.



Evaluation Board Layout

一張含有 電路, 電子工程, 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 螢幕擷取畫面, 文字, 圓形, 設計 的圖片

自動產生的描述

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


一張含有 螢幕擷取畫面, 文字, 圓形, 樣式 的圖片

自動產生的描述

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


一張含有 文字, 螢幕擷取畫面, 圓形, 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 2024/09/26
Bill of Materials 2024/09/26
Schematic 2024/09/26
Gerber File 2024/09/26
RTQ2118A-QA
RTQ2118A-QA

The RTQ2118A combines a charging port controller and a 3A synchronous buck converter.

The RTQ2118A provides the electrical signatures on D+/D- to support charging schemes compatible with the USB 2.0 Battery Charging Specification BC1.2 and Chinese Telecommunication Industry Standard YD/T 1591-2009. Auto-detect mode is also integrated which supports USB 2.0 Battery Charging Specifica­tion BC1.2 Dedicated Charging Port (DCP), Divider 3 mode and 1.2V shorted mode to comply with the legacy fast charging mode of mobile devices.

The RTQ2118A integrates a high efficiency, monolithic synchronous buck converter that can deliver up to 3A output current from a 3V to 36V wide range input supply and is protected from load-dump transients up to 42V.

The RTQ2118A has constant current control to achieve adjustable USB current limit and implement the current sense signal for adjustable USB power output voltage with load line compensation. The converter includes optional spread-spectrum frequency modulation to overcome EMI issue and complete protection for safe and smooth operation in all applied conditions. Protection features include cycle-by-cycle current limit for protection against shorted outputs, soft-start control to eliminate input current surge during start-up, input under-voltage lockout, output under-voltage protection, output over-voltage protection and over-temperature protection. The RTQ2118A can be used to support Type-A connector.

The RTQ2118A is fully specified over the temperature range of TJ = -40°C to 125°C and available in WETD-VQFN-32L 5x5.

TOP