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RT9081AGQZA Linear Regulator Evaluation Board

EVB_RT9081AGQZA(2)

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The RT9081A is a high performance positive voltage regulator with separated bias voltage (VBIAS), designed for applications requiring low input voltage and ultra low dropout voltage, output current up to 500mA. The feature of ultra low dropout voltage is ideal for applications where output voltage is very close to input voltage. The input voltage can be as low as 0.8V and the output voltage is adjustable by an external resistive divider. The RT9081A features very low quiescent current consumption for portable applications. The device is available in the ZADFN-6L 1.2x1.2 package.

Purpose

The The RT9081A is a high performance positive voltage regulator with separated bias voltage (VBIAS), designed for applications requiring low input voltage and ultra low dropout voltage, output current up to 500mA. This document explains the function and use of the RT9081A evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.

 

Introduction

General Product Information

The RT9081A is a high performance positive voltage regulator with separated bias voltage (VBIAS), designed for applications requiring low input voltage and ultra low dropout voltage, output current up to 500mA. The feature of ultra low dropout voltage is ideal for applications where output voltage is very close to input voltage. The input voltage can be as low as 0.8V and the output voltage is adjustable by an external resistive divider. The RT9081A features very low quiescent current consumption for portable applications. The device is available in the ZADFN-6L 1.2x1.2 package.

Product Feature

l Input Voltage Range : 0.8V to 5.5V

l Bias Voltage Range : 2.4V to 5.5V

l 1.5% Output Voltage Accuracy @ 25°C

l Ultra Low Dropout Voltage : 140mV at 500mA

l Low Bias Input Current :

480μA in Operating Mode

40.5μA in Disable Mode

l Enable Control

l Active Discharge Function

l Stable with a 1μF Output Ceramic Capacitor

 

Key Performance Summary Table

Key Features

Evaluation Board Number: PCB087_V1

Default Input Voltage

VOUT(Normal) + 0.3V < VIN < 5.5V, VOUT + 1.6V < VBIAS < 5.5V

Max Output Current

500mA

Default Output Voltage

1.2V

Default Marking & Package Type

RT9081AGQZA(2), ZADFN-6L 1.2x1.2

 

Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

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

Signal

Comment (expected waveforms or voltage levels on test points)

VIN

Input voltage

Power input for the LDO.

EN

Enable test point

LDO enable signal input.

GND

Ground

Ground.

VBIAS

Power input for the internal control circuit

Supply voltage for the LDO control circuit. Mandatory to power up VBIAS before EN and VIN.

VOUT

Output voltage

Power output for the LDO.

 

Power-up & Measurement Procedure

1. Connect input power (VVOUT + 0.3V < VIN < 5.5V, VOUT + 1.6V < VBIAS < 5.5V) and input ground to VIN/VBIAS and GND test pins respectively.

2. Connect positive end and negative terminals of load to VOUT and GND test pins respectively.

3. There is a 3-pin header “EN” for enable control. To use a jumper at “H” option to tie EN test pin to input power VIN for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for disabling the device.

4. Verify the output voltage (approximately 1.2V) between VOUT and GND.

5. Connect an external load up to 500mA to the VOUT and GND terminals and verify the output voltage and current.

 

Output Voltage Setting

Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula:

Technical Document Image Preview

 

Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview

 

Bill of Materials

Reference

Qty

Part number

Description

Package

Manufacture

U1

1

RT9081AGQZA(2)

Linear Regulator

ZADFN-6L 1.2x1.2

RICHTEK

C1, C5

2

C2012X7R1E105KT

1µF/25V/X7R

C-0805

TDK

C4

1

C1608X7R1H104K080AA

0.1μF/50V/X7R

C-0603

TDK

R1

1

RTT033322FTP

33.2k

R-0603

旺詮

R2

1

WR06X6652FTL

66.5k

R-0603

WALSIN

REN1

1

WR06X1003FTL

100k

R-0603

WALSIN

 

PCB Layout

Technical Document Image Preview

PCB Layout—Top View

Technical Document Image Preview

PCB Layout—Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2017/07/26
Bill of Materials 2017/07/26
Gerber File 2017/07/26
Schematic 2017/07/26
RT9081A

5.5V, 500mA超低压差线性稳压器

RT9081A

RT9081A是由独立偏置电压 (VBIAS)驱动的高性能正电压调节器,专为需要低输入电压和超低压差、输出电流高达500mA的应用而设计。超低压差特性是输出电压非常接近输入电压应用的理想选择。输入电压可低至0.8V,输出电压可透过外部电阻分压器调节。RT9085A具有非常低的静态电流消耗,适用于便携式应用,采用ZADFN-6L 1.2x1.2 封装。

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