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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

雙輸出, 300mA 低壓差線性穩壓器

RT9055

RT9055 是雙輸出、低雜訊、低壓差的 300mA 線性穩壓器,其輸出電壓範圍為 0.9V~3.5V ,輸入電壓範圍為 1.5V~5.5V 。RT9055 的輸出電壓精度為 2%,具有極低的輸入輸出電壓降和很低的靜態電流(每路 29μA ),其關機電流幾乎趨於0,是電池供電的可擕式設備的理想之選。它的保護功能包括電流限制、輸出短路保護和過溫保護。RT9055 可與很低容量的陶瓷輸出電容配合穩定工作,對 PCB 空間要求極低,使用成本低廉。RT9055 的封裝是 WL-CSP-6B,擁有 0.8mm x 1.2mm 的小尺寸。

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