EVB RT6266GSP-00

your power partner.
RT6266GSP
Evaluation Board
RT6266 Step-Down Converter Evaluation Board
Purpose
The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter with load line
Compensation. This document explains the function and use of the RT6266 evaluation board (EVB) and provides
information to enable operation and modification of the evaluation board and circuit to suit individual requirements.
Table of Contents
Purpose...................................................................................................................................... 1
Introduction ................................................................................................................................ 2
General Product Description ...................................................................................................... 2
Product Features........................................................................................................................ 2
Application ................................................................................................................................. 2
Evaluation Board ........................................................................................................................ 2
Specification ............................................................................................................................... 3
Schematic .................................................................................................................................. 3
BOM ........................................................................................................................................... 4
PCB Layout ................................................................................................................................ 4
Step-Down Converter Efficiency Test ........................................................................................ 5
More Information ........................................................................................................................ 6
Important Notice for Richtek Evaluation Board .......................................................................... 6
EVB_RT6266GSP-00
June 2015
http://www.richtek.com
your power partner.
RT6266GSP
Evaluation Board
Introduction
General Product Description
The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter that can deliver up to 2.4A
output current from a 7.5V to 36Vinput supply. The RT6266’s current mode architecture with internal compensation
is optimized for 5V car charger application over a wide range of loads and output capacitors. Cycle-by-cycle current
limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The
RT6266 also provides output over voltage protection output under voltage protection and thermal shutdown
protection. The low current (<3μA) shutdown mode provides output disconnect, enabling easy power management
in battery-powered systems. The RT6266 is available in a SOP-8 (Exposed Pad) package.
Product Features
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±2% High Accuracy Feedback Voltage
7.5V to 36V Input Voltage Range
2.4A Continuous Output Current (2.7A Peak)
CC/CV Mode Control
Adjustable Load Line Compensation
Short Circuit Protection
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 100kHz
Programmable Output Current Limit
110mΩ Internal Power MOSFET Switch
Low EMI
Up to 95% Efficiency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
Application
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USB Power Supplies
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Automotive Cigarette Lighter Adapters
Power Supply for Linear Chargers
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DC/DC Converters with Current Limited
Evaluation Board
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]
EVB_RT6266GSP-00
June 2015
http://www.richtek.com
RT6266GSP
Evaluation Board
your power partner.
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
Input voltage range = 7.5V to 36V
VOUT
Output voltage
Output voltage = 5V
CSP
Current Sense Positive Input.
CSN
Current Sense Negative Input.
In this RT6266 EVB original setting, the CSP pin of JP1 should be
connected short with CSN1 by jumper for normal operation.
In this RT6266 EVB original setting, the CSN pin of JP2 should be
connected short with CSN2 by jumper for normal operation.
Power-up & Measurement Procedure
1.
Connect input power (7.5V< VIN < 36V) and input ground to VIN pin.
2.
Connect positive end and negative end of load to VOUT pin.
3.
The output voltage of (Vout) can be set by R1 and R2.
Vout = VREF * (1+R1/R2)
where VREF = 0.8V (typ.)
Specification
Parameter
Input Voltage Range
Symbol
Min
VIN
7.5
Output Voltage
VOUT
Oscillator Frequency
fOSC
Output Current
IOUT
Upper Switch Current Limit
ILIM
Typ.
Max
Units
36
V
5
85
100
4.4
V
115
kHz
2.4
A
A
Schematic
EVB_RT6266GSP-00
June 2015
http://www.richtek.com
RT6266GSP
Evaluation Board
your power partner.
BOM
Reference
Q'ty
P/N
Description
Package
Manufacture
U1
1
RT6266GSP
Step-down converter
SOP-8
RICHTEK
C2, C8, C12
3
C1608X7R1H104K080AA
0.1μF/±10%/50V/X7R
C-0603
TDK
C3, C4
2
C3216X5R1H106K160AB
10μF/±10%/50V/X5R
C-1206
TDK
C1, C5, C6, C7,
C10, C13
6
C9
1
GR, E-Cap
470μF/16V
C11
1
C3216X7R1E106K
10uF/±10%/25V/X7R
L1
1
L2
1
L3
1
D1
1
R1
1
180k
R2
1
34.3k
R3
1
100k
R6, R7
2
Short
R17, R18
2
67m
R4, R5, R8
3
NC
NC
CHI LI TEH
C-1206
TDK
Short
MCD110C-390K-LV
39uH
MAG.LAYERS
NC
CDBA340-G
3A/40V
Comchip
PCB Layout
Top View
Bottom View
EVB_RT6266GSP-00
June 2015
http://www.richtek.com
your power partner.
RT6266GSP
Evaluation Board
Step-Down Converter Efficiency Test
EVB_RT6266GSP-00
June 2015
http://www.richtek.com
your power partner.
RT6266GSP
Evaluation Board
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.
EVB_RT6266GSP-00
June 2015
http://www.richtek.com