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Richtek

300mA Dual LDO Regulator

EVB_RT9055-NGWSC

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The RT9055 is a dual channel, low noise, and low drop Regulator sourcing up to 300mA at each channel. The input voltage range is from 1.5V to 5.5V. The RT9055 offers 2% accuracy, extremely low dropout voltage and extremely low quiescent current (only 29µA per LDO). The shutdown current is near zero which is suitable for battery powered applications. The RT9055 also provides protection function such as current limiting, output shot circuit protection, and over temperature protection.

Purpose

The RT9055 is a dual channel, low noise, and low drop Regulator sourcing up to 300mA at each channel. Its input voltage range is from 1.5V to 5.5V and provides an adjustable regulated output voltage from 0.9V to 3.5V while delivering up to 0.3A of output current. This document explains the function and use of the RT9055 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 RT9055 is a dual channel, low noise, and low drop Regulator sourcing up to 300mA at each channel. The input voltage range is from 1.5V to 5.5V.

 The RT9055 offers 2% accuracy, extremely low dropout voltage and extremely low quiescent current (only 29µA per LDO). The shutdown current is near zero which is suitable for battery powered applications. The RT9055 also provides protection function such as current limiting, output shot circuit protection, and over temperature protection.


Product Feature

  • Wide Operating Voltage Range : 1.5V to 5.5V
  • Low Noise for RF Application
  • No Noise Bypass Capacitor Required
  • Fast Response in Line/Load Transient
  • TTL Logic Controlled Shutdown Input
  • Low Temperature Coefficient
  • Dual LDO Outputs (300mA/300mA)
  • Ultra-Low Quiescent Current : 29µA/LDO
  • High Output Accuracy 2%
  • Short Circuit Thermal Folded Back Protection
  • Thermal Shutdown Protection
  • Current Limit Protection
  • RoHS Compliant and Halogen Free

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB044_V1

Default Ouput Voltage

0.9V to 3.5V

Max Output Current (Dual LDO Outputs)

300mA/300mA

Ultra-Low Quiescent Current (Single LDO)

29µA

Default Marking & Package Type

RT9055-NGWSC, WL-CSP-6B 0.8x1.2



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to 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)

EN1

Enable point

LDO1 Enable (Acitve High).

VOUT1

Output pin

LDO1 Output Voltage.

GND

Ground

Ground.

VIN

Input voltage

Power Supply Input.

EN2

Enable point

LDO2 Enable (Acitve High).

VOUT2

Output pin

LDO2 Output Voltage.



Power-up & Measurement Procedure

1. Connect input power (1.5V < VIN < 5.5V) and input ground to VIN and GND test pins respectively.

2. To use a jumper at “H” option to tie EN test pin for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for disabling the device.

3. Connect an external load up to 0.3A to the VOUT and GND terminals and verify the output voltage.



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

RT9055-NGWSC

Linear Regulator

WL-CSP-6B 0.8x1.2

RICHTEK

C1, C2, C3

3

C0603X5R

1µF/25V

C-0603

TDK

JP1, JP2

2

Jumper

GP1, GP2, GP3, GP4, GP5, GP6, GP7, GP8

8

Golden Pin

Z1, Z2, Z3, Z4

4

SIP-1P-M

SIP-1P-M



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2016/04/21
Bill of Materials 2016/04/21
Gerber File 2016/04/21
Schematic 2016/04/21
RT9055

双输出, 300mA 低压差线性稳压器

RT9055

RT9055 是双输出、低噪声、低压差的 300mA 线性稳压器,其输出电压范围为 0.9V~3.5V ,输入电压范围为 1.5V~5.5V 。RT9055 的输出电压精度为 2%,具有极低的输入输出电压降和很低的静态电流(每路 29μA ),其停机电流几乎趋于0,是电池供电的便携式设备的理想之选。它的保护功能包括电流限制、输出短路保护和过热保护。RT9055 可与很低容量的陶瓷输出电容配合稳定工作,对 PCB 空间要求极低,使用成本低廉。RT9055 的封装是 WL-CSP-6B,拥有 0.8mm x 1.2mm 的小尺寸。

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