EVB RT9742AGJ5F-00 EN

RT9742AGJ5F
Evaluation Board
your power partner.
55mΩ, 3A High-Side Power Switches with Flag
Purpose
The RT9742A is a cost-effective, low-voltage, single N-MOSFET high-side Power Switch IC for USB application. This
document explains the function and use of the RT9742A 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
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RT9742AGJ5F
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Introduction
General Product Information
The RT9742A integrates an over-current protection circuit, a short fold back circuit, a thermal shutdown circuit and
an under-voltage lockout circuit for overall protection. Besides, a flag output is vailable to indicate fault conditions to
the local USB controller. Furthermore, the chip also integrates an embedded delay function to prevent miss-operation
from happening due to inrush-current. The RT9742A is an ideal solution for USB power supply and can support
flexible applications since it is available in TSOT-23-5 (FC) package.
Product Feature
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55mΩ (typ.) N-MOSFET Switch
Operating Range : 2.7V to 6V
Reverse Blocking Current
Under Voltage Lockout
Deglitched Fault Report (FLG)
Thermal Protection with Fold-back
Over Current Protection
Short Circuit Protection
UL Approved−E219878
Nemko Approved-NO87949
Key Performance Summary Table
Key Features
Evaluation Board Number : PCB050_V1
Input Voltage Range
2.7V to 6V
Max Output Current
3A
Default Output Voltage
5V @ VIN = 5V
Default Marking & Package Type
RT9742AGJ5F, TSOT-23-5 (FC)
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RT9742AGJ5F
Evaluation Board
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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
[email protected]
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. Support 2.7V to 6V Input Voltage.
EN
Enable test point
High = Enable. Apply a voltage exceeds than enable logic high voltage
(2V) for chip enable.
GND
Ground
Ground.
VOUT
Output voltage
Output voltage pin. Probe this pin to observe the output voltage
waveform.
/FLG
Fault FLAG Output
FLAG output indicator pin. FLAG is a low active output. Once the over
current, short circuit, and over temperature occurring, it will indicate
“LOW” after 10ms delay time.
Power-up & Measurement Procedure
1. Connecting input power (2.7V < VIN < 6V) and input ground to VIN and GND test pins respectively.
2. Connecting 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 “HI” option to tie EN test pin to input power
VIN for enabling the device. Inversely, to use a jumper at “LO” option to tie EN test pin and ground GND for
disabling the device.
4. Connecting an external load up to 5A to the VOUT and GND terminals and verify the over current protection and
FLAG indication.
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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
RT9742AGJ5F
Power Switch with Flag
TSOT-23-5 (FC)
RICHTEK
CIN
1
10µF/10V/X7R/0805
C-0805
COUT
1
0.1μF/50V/X7R/0805
C-0805
C1, C2
2
NC
J1
1
SIP-3P
SIP-3P
R1
1
10kΩ/0603
R-0603
R3
1
100kΩ/0603
R-0603
R2
1
NC
GP1, GP2, GP3,
GP4
4
VIN, GND, VOUT, GND
(Gold Pin)
SIP-1P
TP1, TP2, TP3
3
VIN-S, VOUT-S, /FLG
(Test Pin)
SIP-1P
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PCB Layout
Top View
Bottom View
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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 TO
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
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