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36VIN, 3A, High Efficiency, 2.1MHz, Synchronous Step-Down Converter Evaluation Board

EVB_RTQ2104GSP-QA

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General Description

The RTQ2104GSP-QA evaluation board showcases the regulator’s performance, delivering 3A output from a 4V to 36V input at 2.1MHz. Suitable for industrial and communication systems, it offers protection against shorted outputs, input undervoltage, overcurrent, and thermal shutdown. The documentation includes a BOM, typical application, board overview, power-up procedure, performance summary, and hardware description to provide information on the board’s components, capabilities, and usage.



Performance Specification Summary

Summary of the RTQ2104GSP Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2104GSP Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

Soft-start is finished

3

--

36

V

Output Current

0

--

3

A

Default Output Voltage

0.8

--

VIN

V

Operation Frequency

1.89

2.1

2.31

MHz

Output Ripple Voltage

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

--

10

--

mVp-p

Line Regulation

VOUT = 5V, IOUT = 3A, VIN = 7V to 25V

--

±1

--

%

Load Regulation

VIN = 12V, VOUT = 5V, IOUT = 0.5A to 3A

--

±1

--

%

Load Transient Response

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

--

±10

--

%

Maximum Efficiency

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

--

90

--

%



Power-up Procedure

Suggestion Required Equipments

  • RTQ2104GSP Evaluation Board
  • DC power supply capable of at least 36V and 3A
  • Electronic load capable of 3A
  • Function Generator
  • Oscilloscope

Quick Start Procedures

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made. 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) With power off, connect the input power supply to VIN and GND pins.

2) With power off, connect the electronic load between the VOUT and nearest GND pins.

3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 36V on the Evaluation Board.

4) Check for the proper output voltage using a voltmeter.

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.



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 電子產品, 螢幕擷取畫面, 電路 的圖片

自動產生的描述

一張含有 文字, 螢幕擷取畫面, 電路, Rectangle 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

DC power supply positive input terminal. The input voltage range is from 3V to 36V after soft-start is finished.

VOUT

Electronic load positive output terminal. Draw maximum output current up to 3A.

GND

Reference ground for power supply or electronic load. Provide the ground return path for the control circuitry and low-side power MOSFET.

VIN_EMI+

Positive input terminal of EMI filter circuit.

VIN_EMI-

Negative input terminal of EMI filter circuit.

PG

Power-good indication test point. The test point can be used to measure the power-good singal.

EN

Enable control input. A logic-high enables the converter; a logic-low forces the device into shutdown mode.

JP1

EN jumper. Connect EN to logic-low to disable, connect logic-high to enable.



Bill of Materials

VIN = 12V, VOUT = 5V, IOUT = 3A, fSW = 2100kHz

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U4

1

RTQ2104GSP-QA

RTQ2104GSP-QA

Step-Down Converter

SOP-8 (Exposed Pad)

RICHTEK

CFF1

1

0603B121K500CT

120pF

Capacitor, Ceramic, 50V, X7R

0603

WALSIN

CVCC1

1

GRM21BR71A106KE51L

10µF

Capacitor, Ceramic, 10V, X7R

0805

MURATA

C3

1

UMK316AB7475KL-T

4.7µF

Capacitor, Ceramic, 50V, X7R

1206

TAIYO

YUDEN

C4, C7, C16, CBOOT1

4

0603B104K500CT

0.1µF

Capacitor, Ceramic, 50V, X7R

0603

WALSIN

C5, C6

2

LMK316AB7226KL-TR

22µF

Capacitor, Ceramic, 10V, X7R

1206

TAIYO

YUDEN

R1

1

WR06X1053FTL

105k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R2

1

WR06X2002FTL

20k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

RBOOT1

1

WR06X10R0FTL

10

Resistor, Chip, 1/10W, 1%

0603

WALSIN

RPG1, REN1

2

WR06X1003FTL

100k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

L1

1

78439344022

2.2µH

Inductor,

Isat = 7.5A, 10.5mΩ

6.65x6.45x3mm

Würth Elektronik



Typical Applications

EVB Schematic Diagram

一張含有 圖表, 文字, 方案, 圖解 的圖片

自動產生的描述


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

Load Transient Response

Technical Document Image Preview

Technical Document Image Preview

Power On from EN

Power Off from EN

Technical Document Image Preview

Technical Document Image Preview

Short Circuit Response – Short and Recovery

Start-Up Dropout Performance

Technical Document Image Preview

Technical Document Image Preview

Efficiency vs. Output Current

Output Voltage vs. Output Current

Technical Document Image Preview

Technical Document Image Preview

Output Voltage vs. Input Voltage

Radiated EMI Performance

Technical Document Image Preview

Technical Document Image Preview


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

Figure 1 to Figure 4 are RTQ2104GSP Evaluation Board layout. This board size is 100mm x 70mm and is constructed on four-layer PCB, outer layers with 2 oz. Cu and inner layers with 1 oz. Cu.

Technical Document Image Preview

Figure 1. Top View (1st layer)


Technical Document Image Preview

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


Technical Document Image Preview

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


Technical Document Image Preview

Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2024/08/14
Bill of Materials 2024/08/14
Schematic 2024/08/14
Gerber File 2024/08/14
RTQ2104-QA
RTQ2104-QA

The RTQ2104 is a 3A, high-efficiency, current mode synchronous step-down converter which is optimized for automotive applications. The device operates with input voltages from 3V to 36V and is protected from load dump transients up to 42V, eases input surge protection design. The device can program the output voltage between 0.8V to VIN. The low quiescent current design with the integrated low RDS(ON) power MOSFETs achieves high efficiency over the wide load range. The peak current mode control with simple internal compensation allows the use of small inductors and results in fast transient response and good loop stability.

The ultra-low minimum on-time enable constant-frequency operation even at very high step down ratios. The build-in spread-spectrum frequency modulation further helping systems designers with better EMC management.

The RTQ2104 provides complete protection functions such as input under voltage lockout, output under voltage protection, over current protection, and thermal shutdown. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RTQ2104 is available in SOP-8 (Exposed Pad) package.

IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RTQ2104GSP-QAPSOP-82,500 Request Digikey 3 Buy
Mouser 0 Lead-Time: 14 weeks
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