RICHTEK RTQ2540HN-TA Evaluation Board User Guide
- June 12, 2024
- RICHTEK
Table of Contents
- RICHTEK RTQ2540HN-TA Evaluation Board
- Product Usage Instructions
- General Description
- Performance Specification Summary
- Power-up & Measurement Procedure
- Suggestion Required Equipment:
- Detailed Description of Hardware
- Typical Applications
- Evaluation Board Layout
- FAQ
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
RICHTEK RTQ2540HN-TA Evaluation Board
Specifications
- Input Voltage Range: 1.1V to 6.5V
- Output Voltage Range: 0.8V to 5.5V
- Line Regulation: 0.05% per Volt
- Load Regulation: 0.08% per Ampere
- Dropout Voltage: 70mV to 145mV
- Package: WQFN-12L 2.2×2.5 (FC)
Product Usage Instructions
Power-up & Measurement Procedure
Suggested Equipment:
- RTQ2540H evaluation board
- DC power supply capable of at least 6.5V and 4A
- Electronic load capable of 4A
- Function generator
- Oscilloscope
Test Procedure:
- Connect input power supply to VIN and GND through GP1/GP2 terminals.
- Connect electronic load to VOUT and GND through GP3/GP4 terminals.
- Turn on power supply ensuring input voltage does not exceed 6V.
- Check output voltage regulation with different load currents for normal operation.
Notifications:
- Do not turn on input power supply before all connections are ready.
- Avoid using oscilloscope probes with long ground leads for output ripple voltage measurement.
Detailed Description of Hardware: Headers Description and Placement
Carefully inspect all components in the EVB based on the Bill of Materials
table to ensure correct installation and no damage. Contact distributors or
email evb_service@richtek.com for missing or
damaged components.
Test Points
| Test Point | Pin Name | Description |
|---|---|---|
| GP1 | VIN | Positive terminal for supply input voltage. |
| GP2 | GND | Negative terminal for supply input voltage. |
| GP3 | VOUT | Positive terminal for output voltage. |
| GP4 | GND | Negative terminal for output voltage. |
General Description
The RTQ2540H is a high-current, ultra-low noise, ultra-low-dropout (LDO) linear regulator. This document explains the function and use of the RTQ2540H evaluation board (EVB) and provides information for the setup and operating instructions, a schematic diagram, a printed circuit board (PCB) layout, and a bill of materials (BOM). For more detail information, please refer to the RTQ2540H datasheet.
Performance Specification Summary
The RTQ2540H Evaluation Board (EVB) is a four-layer board measuring 50mm x 33.5mm with a copper thickness of 1oz, and Table 1 is the summary of the EVB performance specification.
Table 1. RTQ2540H Evaluation Board Performance Specification Summary
| Key Features | Test Conditions | Min | Typ | Max | Unit |
|---|
Input Range
Input Voltage| | 1.1| 1.1| 6.5| V
Enable Input Voltage| | 1.1| —| 6.5| V
Output Range
Output Voltage| Using external resistive voltage divider| 0.8| 0.8| 5.5| V
Line Regulation| IOUT = 1mA, 1.1V ≤ VIN ≤ 6.5V| —| 0.05| —| %/V
Load Regulation| 1mA ≤ IOUT ≤ 4A| —| 0.08| —| %/A
Dropout Voltage| VIN = 1.1V to 6.5V, IOUT = 4A, VFB = 0.8V – 3%| —| 70| 145|
mV
Package
WQFN-12L 2.2×2.5 (FC)
Power-up & Measurement Procedure
Suggestion Required Equipment:
- RTQ2540H evaluation board
- DC power supply capable of at least 6.5V and 4A
- Electronic load capable of 4A
- Function generator
- Oscilloscope
Test Procedure with Suitable Measurement Equipment:
- Connect input power supply with wide and short as possible to VIN and GND through GP1/GP2 terminals.
- Connect the electronic load to VOUT and GND through GP3/GP4 terminals.
- Turn on the power supply and make sure that the input voltage does not exceed 6V.
- Check output voltage regulation with different IOUT for normal operation.
Notifications:
- Do not turn on input power supply before all connections are ready.
- Do not use the oscilloscope probe with long ground lead for output ripple voltage measurement, it is recommended to touch the probe tip and grounding directly across the last output capacitor.
Detailed Description of Hardware
Headers Description and Placement
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 | Description |
|---|---|---|
| GP1 | VIN | Positive terminal for supply input voltage. |
| GP2 | GND | Negative terminal for supply input voltage. |
| GP3 | VOUT | Positive terminal for output voltage. |
| GP4 | GND | Negative terminal for output voltage. |
| GP5 | GND | Reference ground test point. |
| TP1 | VIN | For supply input voltage measurement. |
| TP2 | EN | Enable voltage input pin. |
| TP3 | PGOOD | For power good measurement. |
| TP4 | VOUT | For output voltage measurement. |
| JP1 | Enable | Connection for Enable voltage. |
| JP2 | PGOOD | Connection for power good pull high voltage. |
Bill of Materials
| Reference | Count | Part Number | Description | Package | Manufacturer |
|---|---|---|---|---|---|
| U1 | 1 | RTQ2540HN-TA | Linear Regulator | WQFN-12L 2.2×2.5 (FC) | RICHTEK |
| C3, C6 | 2 | 1210X476K160CT | Capacitor, Ceramic, 47µF, 16V, X5R | C-1210 | WALSIN |
| C4, C5 | 2 | 0603B104K500CT | Capacitor, Ceramic, 0.1µF, 50V, X7R | C-0603 | WALSIN |
| C9, C11 | 2 | 0603B103K500CT | Capacitor, Ceramic, 10nF, 50V, X7R | C-0603 | WALSIN |
| C10 | 1 | 0603B105K250CT | Capacitor, Ceramic, 1µF, 25V, X5R | C-0603 | WALSIN |
| R1 | 1 | RTT031182FTP | Resistor, Chip, 11.8k, 1% | R-0603 | RALEC |
| R2 | 1 | WR06X3741FTL | Resistor, Chip, 3.74k, 1% | R-0603 | WALSIN |
| R3, R5 | 2 | WR06X1003FTL | Resistor, Chip, 100k, 1% | R-0603 | WALSIN |
Typical Applications
EVB Schematic Diagram
Measure Result
Evaluation Board Layout
Figure 1 to Figure 4 are the RTQ2540H evaluation board layout.
More Information
For more information, please find the related datasheet or application notes
from the Richtek website http://www.richtek.com.
Important Notice for Richtek Evaluation Board
THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL
BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT
OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL
RICHTEK BE LIABLE TO THE BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING
WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
FAQ
Q: What should I do if the output voltage is not within the specified
range?
A: Check the input voltage and load conditions, ensure proper
connections, and verify component integrity.
Q: Can I use a power supply with a higher voltage than 6.5V?
A: It is recommended to stay within the specified input voltage range to
prevent damage to the device.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>