RT9055-NGWSC
Evaluation Board
your power partner.
300mA Dual LDO Regulator
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.
Table of Contents
Purpose ................................................................................................................................................................. 1
Introduction............................................................................................................................................................ 2
Key Performance Summary Table .......................................................................................................................... 2
Bench Test Setup Conditions ................................................................................................................................. 3
Schematic, Bill of Materials & Board Layout ........................................................................................................... 4
More Information.................................................................................................................................................... 6
Important Notice for Richtek Evaluation Board ....................................................................................................... 6
EVB_RT9055-NGWSC
April
2016
1
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RT9055-NGWSC
Evaluation Board
your power partner.
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
EVB_RT9055-NGWSC
April
2016
2
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RT9055-NGWSC
Evaluation Board
your power partner.
Bench Test Setup Conditions
Headers Description and Placement
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.
EVB_RT9055-NGWSC
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2016
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RT9055-NGWSC
Evaluation Board
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Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
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
GP1, GP2, GP3,
GP4, GP5, GP6,
GP7, GP8
Z1, Z2, Z3, Z4
2
Jumper
8
Golden Pin
4
SIP-1P-M
EVB_RT9055-NGWSC
April
2016
4
SIP-1P-M
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RT9055-NGWSC
Evaluation Board
your power partner.
PCB Layout
Top View
Bottom View
EVB_RT9055-NGWSC
April
2016
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RT9055-NGWSC
Evaluation Board
your power partner.
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 T O
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
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2016
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