Richtek Rtq2522agqw Evaluation Board Owner's Manual (+ PDF)

Contents hide

1 RTQ2522AGQW Evaluation Board

2 Product Information

2.1 Performance Specification Summary

3 Product Usage Instructions

3.1 Power-up Procedure

3.2 Detailed Description of Hardware

3.2.1 Headers Description and Placement

3.2.2 Test Points

3.3 Documents / Resources

3.3.1 References

RTQ2522AGQW Evaluation Board

Product Information

The RTQ2522AGQW(2) Evaluation Board is a reference design for
demonstration and evaluation of the RTQ2522A, an ultra-low dropout
(LDO) linear regulator with soft-start. It features a 2A output
current capability and is designed for use in various power
applications.

The Evaluation Board user guide provides detailed information on
the operational use of the board. It includes setup and operating
instructions, thermal and layout guidelines, a PCB layout,
schematic diagram, and a bill of materials (BOM). For more detailed
information, please refer to the RTQ2522A datasheet available at
http://www.richtek.com.

Performance Specification Summary

Specification	Test Conditions	Min	Typ	Max	Unit
Input Voltage Range	VOUT + Vdrop	1.1	–	5.5	V
VBIAS Pin Voltage	–	2.7	–	5.5	V
Output Voltage Range	Vin = 5V, IOUT = 2A	0.8	0.8	3.6	V
Line Regulation	VOUT (normal) + 0.3V VIN 5.5V	–	0.03	–	%/V
Load Regulation	50mA IOUT 2A	–	0.09	–	%/A
VIN Dropout Voltage	–	–	100	150	mV
VBIAS Dropout Voltage	VOUT = 80% x VOUT (normal)	–	1.55	1.8	V

Product Usage Instructions

Power-up Procedure

To power up the RTQ2522AGQW(2) Evaluation Board, you will need
the following equipment:

RTQ2522A Evaluation Board
DC power supply capable of at least 5.5V and 2A
Electronic load capable of 2A
Function Generator
Oscilloscope

Follow the steps below to verify board operation:

With power off, connect the input power supply to VIN and GND
pins.
With power off, connect the electronic load between the VOUT
and nearest GND pins.
Turn on the power supply at the input. Make sure that the input
voltage does not exceed 6V on the Evaluation Board.
Check the proper output voltage using a voltmeter.
Once the proper output voltage is established, adjust the load
within the operating ranges and observe the output voltage
regulation, quiescent current, dropout voltage, PSRR, noise, and
other performance parameters.

Detailed Description of Hardware

Headers Description and Placement

The RTQ2522AGQW(2) Evaluation Board consists of various headers
for connecting external components. Please carefully inspect all
the components used in the board according to the provided Bill of
Materials table and ensure that they are undamaged and correctly
installed. If any component is missing or damaged, please contact
our distributors or email us at [email protected].

Test Points

The Evaluation Board is equipped with test points for easy
measurement and debugging. The test points and their corresponding
pin names are listed in the table below:

Test Point/ Pin Name	Function
VIN	Supply input pin.
VOUT	Output voltage pin.

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your power partner.

RTQ2522AGQW(2) Evaluation Board

2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start Evalution Board Guidance

General Description
The Evaluation Board user guide describes the operational use of the RTQ2522A evaluation board as a reference design for demonstration and evaluation of the RTQ2522A, an ultra-low dropout (LDO) linear regulator with soft-start. Included in this user guide are setup and operating instructions, thermal and layout guidelines, a printed circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM). For more detail information, please refer to the RTQ2522A datasheet
Table of Contents
General Description ……………………………………………………………………………………………………………………………………1 Performance Sepcification Summary ……………………………………………………………………………………………………………2 Power-up Procedure …………………………………………………………………………………………………………………………………..2 Detailed Description of Hardware …………………………………………………………………………………………………………………3 Bill of Materials…………………………………………………………………………………………………………………………………………..4 Typical Applications ……………………………………………………………………………………………………………………………………5 Evaluation Board Layout……………………………………………………………………………………………………………………………..8 More Information………………………………………………………………………………………………………………………………………10 Important Notice for Richtek Evaluation Board……………………………………………………………………………………………..10

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RTQ2522AGQW(2) Evaluation Board

Performance Specification Summary

Summary of the RTQ2522A Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.

Table 1. RTQ2522A Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min Typ Max Unit

Input Voltage Range

VOUT + Vdrop

1.1

5.5

VBIAS Pin Voltage

2.7

— 5.5 V

Output Voltage Range

Vin = 5V, IOUT = 2A

0.8 0.8 3.6 V

Line Regulation

VOUT (normal) + 0.3V VIN 5.5V

—

0.03 — %/V

Load Regulation

50mA IOUT 2A

—

0.09 — %/A

VIN Dropout Voltage

IOUT = 2A, VBIAS VOUT (normal) 3.25V

—

100 150 mV

VBIAS Dropout Voltage

VOUT = 80% x VOUT (normal)

—

1.55 1.8

Power-up Procedure
Suggestion Required Equipments RTQ2522A Evaluation Board DC power supply capable of at least 5.5V and 2A Electronic load capable of 2A 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 groundring 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 6V 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, quiescent current, dropout voltage, PSRR, noise and other performance.

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Detailed Description of Hardware
Headers Description and Placement

RTQ2522AGQW(2) Evaluation Board

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 [email protected].

Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test Point/ Pin Name

Function

VIN

Supply input pin.

VOUT

Output of the regulator.

Power good sense pin.

VBIAS

Input pin of bias voltage.

Enable sense pin.

GND

System ground pin.

Soft-start capacitor waveform sense pin.

ENABLE

User can decide EN pin connected to high or low.

BIAS-EN/VIN-EN

Decision of EN pin pull-high voltage source.

BIAS-PG/VOUT-PG Decision of PG pull-high voltage source.

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Bill of Materials

RTQ2522AGQW(2) Evaluation Board

VIN = 1.1V to 6.5V, VOUT = 0.8V to 5.5V, IOUT = 2A

Reference Count

Part Number

Value

Description

Package Manufacturer

RTQ2522AGQW(2)

RTQ2522A

LDO

WDFN-10L 3×3 RICHTEK

TMK212BJ475KG-T

4.7F

Capacitor, ceramic, 25V, X5R

0805

TAIYO YUDEN

1 GRM21BR71A106KE51L

10F

Capacitor, ceramic, 10V, X7R

0805

MURATA

CBIAS

0805B105K250CT

Capacitor, ceramic, 25V, X7R

0805

WALSIN

CSS

0603B102K500CT

1nF

Capacitor, ceramic, 50V, X7R

0603

WALSIN

R1, R5 2

WR06X000 PTL

Resistor, chip

0603

WALSIN

REN1,

REN2, RPG1,

RPG2

WR06X1003FTL

100k

Resistor, chip

0603

WALSIN

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Typical Applications
EVB Schematic Diagram

RTQ2522AGQW(2) Evaluation Board

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.

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Measure Result

Power Up Response

RTQ2522AGQW(2) Evaluation Board
Enable Voltage Threshold vs. Temperature

VBIAS Voltage UVLO vs. Temperature

Dropout Voltage vs. Output Current

Output Spectral Noise Density

VIN PSRR vs. Frequency

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Load Transient Response

RTQ2522AGQW(2) Evaluation Board
OCP

Short Protection

Bode Plot

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.

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RTQ2522AGQW(2) Evaluation Board

Evaluation Board Layout

Figure 1 to Figure 4 are RTQ2522A Evaluation Board layout. This board is constructed on four-layer PCB, outer layers with 1 oz. Cu and inner layers with 1 oz. Cu.

Figure 1. Top View (1st layer)

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

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RTQ2522AGQW(2) Evaluation Board

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

Figure 4. Bottom View (4th Layer)

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RTQ2522AGQW(2) Evaluation Board

More Information

For more information, please find the related datasheet or application notes from 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 BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES.

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