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2A, 6.5V, Ultra Low Noise, Ultra Low Dropout Linear Regulator

EVB_RTQ2532WGQV(2)

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The Evaluation Board user guide describes the operational use of the RTQ2532W evaluation board as a reference design for demonstration and evaluation of the RTQ2532W, an ultra-low noise, ultra low-dropout (LDO) linear regulator.

General Description

The Evaluation Board user guide describes the operational use of the RTQ2532W evaluation board as a reference design for demonstration and evaluation of the RTQ2532W, an ultra-low noise, ultra low-dropout (LDO) linear regulator.

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 RTQ2532W datasheet.



Performance Specification Summary

Summary of the RTQ2532W Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2532W Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

1.1

1.1

6.5

V

Output Current

0

--

2

A

Output Voltage Range

Using ecternal resistors

0.8

0.8

5.5

V

Line Regulation

IOUT = 1mA, 1.1V ≤ VIN ≤ 6.5V

--

0.05

--

%/V

Load Regulation

1mA ≤ IOUT ≤ 2A

--

0.08

--

%/A

Dropout Voltage

VIN = 1.1V to 6.5V, IOUT = 2A,

VFB = 0.8V - 3%

--

--

125

mV



Power-up Procedure

Suggestion Required Equipments

  • RTQ2532W Evaluation Board
  • DC power supply capable of at least 6.5V 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.



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 電子用品 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

VOUT

Output of the regulator.

VIN

Supply input pin.

BIAS

Bias input pin.

PG

Power good sense pin.

GND

System ground pin.

EN

Enable sense pin.

VOUT-S1/VOUT-S2

Waveform sense pin for resistor R3.

JP1

User can decide EN pin connected to high or low.

JP3

Output voltage setting pin.

J5

Short to by-pass resistor R3.



Bill of Materials

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

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RTQ2532WGQV(2)

RTQ2532W

LDO

VQFN-20L 5x5

RICHTEK

C-NR/SS, CFF

2

0603B103K500CT

10nF

Capacitor, ceramic,

50V, X7R

0603

WALSIN

C3, C11

2

0805X226M250CT

22μF

Capacitor, ceramic,

25V, X5R

0805

WALSIN

C9, C12

2

0603B104K500CT

0.1μF

Capacitor, ceramic,

50V, X7R

0603

WALSIN

R-SNS, R3

2

WR06X000 PTL

0

Resistor, Chip

0603

WALSIN

REN1, RPG

2

WR06X1003FTL

100k

Resistor, Chip

0603

WALSIN



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 smaller size MLCC capacitors will have much lower capacitance.

3. VOUT select pin settings of JP3 please refer to Table 2.


Table 2. VOUT Select Pin Settings for Different Targets

VOUT (V)

50mV

100mV

200mV

400mV

800mV

1.6V

VOUT (V)

50mV

100mV

200mV

400mV

800mV

1.6V

0.8

Open

Open

Open

Open

Open

Open

2.4

Open

Open

Open

Open

Open

GND

0.85

GND

Open

Open

Open

Open

Open

2.45

GND

Open

Open

Open

Open

GND

0.9

Open

GND

Open

Open

Open

Open

2.5

Open

GND

Open

Open

Open

GND

0.95

GND

GND

Open

Open

Open

Open

2.55

GND

GND

Open

Open

Open

GND

1

Open

Open

GND

Open

Open

Open

2.6

Open

Open

GND

Open

Open

GND

1.05

GND

Open

GND

Open

Open

Open

2.65

GND

Open

GND

Open

Open

GND

1.1

Open

GND

GND

Open

Open

Open

2.7

Open

GND

GND

Open

Open

GND

1.15

GND

GND

GND

Open

Open

Open

2.75

GND

GND

GND

Open

Open

GND

1.2

Open

Open

Open

GND

Open

Open

2.8

Open

Open

Open

GND

Open

GND

1.25

GND

Open

Open

GND

Open

Open

2.85

GND

Open

Open

GND

Open

GND

1.3

Open

GND

Open

GND

Open

Open

2.9

Open

GND

Open

GND

Open

GND

1.35

GND

GND

Open

GND

Open

Open

2.95

GND

GND

Open

GND

Open

GND

1.4

Open

Open

GND

GND

Open

Open

3

Open

Open

GND

GND

Open

GND

1.45

GND

Open

GND

GND

Open

Open

3.05

GND

Open

GND

GND

Open

GND

1.5

Open

GND

GND

GND

Open

Open

3.1

Open

GND

GND

GND

Open

GND

1.55

GND

GND

GND

GND

Open

Open

3.15

GND

GND

GND

GND

Open

GND

1.6

Open

Open

Open

Open

GND

Open

3.2

Open

Open

Open

Open

GND

GND

1.65

GND

Open

Open

Open

GND

Open

3.25

GND

Open

Open

Open

GND

GND

1.7

Open

GND

Open

Open

GND

Open

3.3

Open

GND

Open

Open

GND

GND

1.75

GND

GND

Open

Open

GND

Open

3.35

GND

GND

Open

Open

GND

GND

1.8

Open

Open

GND

Open

GND

Open

3.4

Open

Open

GND

Open

GND

GND

1.85

GND

Open

GND

Open

GND

Open

3.45

GND

Open

GND

Open

GND

GND

1.9

Open

GND

GND

Open

GND

Open

3.5

Open

GND

GND

Open

GND

GND

1.95

GND

GND

GND

Open

GND

Open

3.55

GND

GND

GND

Open

GND

GND

2

Open

Open

Open

GND

GND

Open

3.6

Open

Open

Open

GND

GND

GND

2.05

GND

Open

Open

GND

GND

Open

3.65

GND

Open

Open

GND

GND

GND

2.1

Open

GND

Open

GND

GND

Open

3.7

Open

GND

Open

GND

GND

GND

2.15

GND

GND

Open

GND

GND

Open

3.75

GND

GND

Open

GND

GND

GND

2.2

Open

Open

GND

GND

GND

Open

3.8

Open

Open

GND

GND

GND

GND

2.25

GND

Open

GND

GND

GND

Open

3.85

GND

Open

GND

GND

GND

GND

2.3

Open

GND

GND

GND

GND

Open

3.9

Open

GND

GND

GND

GND

GND

2.35

GND

GND

GND

GND

GND

Open

3.95

GND

GND

GND

GND

GND

GND


Measure Result

Power Up Response

Output Noise vs. Frequency and Output Voltage

Technical Document Image Preview

Technical Document Image Preview

PSRR vs. Frequency and Iout

Load Transient Response

Technical Document Image Preview

Technical Document Image Preview

Load Transient Response vs. Load Slew Rate

Dropout Voltage vs. Output Current

Technical Document Image Preview

Technical Document Image Preview

OCP

Bode Plot

Technical Document Image Preview

一張含有 桌 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

Figure 1 to Figure 4 are RTQ2532W Evaluation Board layout. This board is constructed on four-layer PCB, outer layers with 1 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)


一張含有 文字, 電子用品, 電腦 的圖片

自動產生的描述

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


一張含有 文字, 電子用品, 電腦 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 2023/02/17
Bill of Materials 2023/02/20
Schematic 2023/02/20
Gerber File 2023/02/20
RTQ2532W
RTQ2532W

The RTQ2532W is a high-current (2A), low-noise (6.8μVRMS), high-accuracy (1% over line, load, and temperature), low-dropout linear regulator (LDO) capable of sourcing 2A with extremely low dropout (maximum 125mV). The device output voltage is pin-selectable (up to 3.95V) using a PCB layout without the need of external resistors, thus reducing the overall component count. Designers can achieve higher output voltage with the use of an external resistor divider. The device supports single input supply voltage as low to 1.1V that makes it easy to use.The low noise, high PSRR, and high output current capability make the RTQ2532W ideal to power noise-sensitive devices such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. With very high accuracy, remote sensing, and soft-start capabilities to reduce inrush current, the RTQ2532W is ideal for powering digital loads such as FPGAs, DSPs, and ASICs.The external enable control and power-good indicator function make the control sequence easier. The output noise immunity is enhanced by adding an external bypass capacitor on the NR/SS pin. The device is fully specified over the temperature range of TJ = -40°C to 125°C and is offered in a VQFN-20L 5x5 package.

Part NumberDistributorStockBuy From Authorized Distributor
EVB_RTQ2532WGQV(2) Digikey 4 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RTQ2532WGQV(2)VQFN5x5-201,500 样品 Digikey 2,364 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
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