RT8071CGQW
Evaluation Board
your power partner.
3A, 1MHz, Synchronous Step-Down Converter
Purpose
The RT8071C is a high efficiency synchronous, step-down DC/DC converter. Its input voltage ranges from 2.7V to
5.5V that provides an adjustable regulated output voltage from 0.6V to VIN while delivering up to 3A of output current.
This document explains the function and use of the RT8071C 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 ........................................................................................................... 5
More Information.................................................................................................................................................... 7
Important Notice for Richtek Evaluation Board ....................................................................................................... 7
EVB_RT8071CGQW-00
October 2015
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RT8071CGQW
Evaluation Board
your power partner.
Introduction
General Product Information
The RT8071C is a high efficiency synchronous, step-down DC/DC converter. Its input voltage ranges from 2.7V to
5.5V that provides an adjustable regulated output voltage from 0.6V to VIN while delivering up to 3A of output current.
The internal synchronous low On-resistance power switches increase efficiency and eliminate the need for an
external Schottky diode. The switching frequency is fixed internally at 1MHz. The 100% duty cycle provides low
dropout operation, hence extending battery life in portable systems. Current mode operation with internal
compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The
RT8071C is available in a WDFN-10L 3x3 package.
Product Feature
High Efficiency : Up to 95%
Low RDS(ON) Power Switches : 69mΩ/49mΩ
Current Mode Operation
Fast Transient Response
Fixed Frequency : 1MHz
No Schottky Diode Required
Internal Compensation
0.6V Reference Allows Low Output Voltage
Low Dropout Operation : 100% Duty Cycle
OCP, UVP, OTP
OpenVReg Type 0-LV Compliant
Key Performance Summary Table
Key Features
Evaluation Board Number : PCB052_V1
Input Voltage Range
2.7V to 5.5V
Max Output Current
3A
Default Output Voltage
1.05V
Default Marking & Package Type
RT8071CGQW, WDFN-10L 3x3
Operation Frequency
Steady 1MHz at all loads
EVB_RT8071CGQW-00
October 2015
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RT8071CGQW
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)
FB
Feedback voltage input
Feedback Input. This pin receives the feedback voltage from a
resistive voltage divider connected across the output.
VCC
Supply voltage input.
Supply Voltage Input. Decouple this pin to GND with at least 1µF
ceramic capacitor.
VIN
Input voltage
Power input. Support 2.7V to 5.5V Input Voltage. Decouple this pin to
GND with at least 10µF ceramic capacitor.
GND
Ground
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
SW
Switch node test point
Switch Node. Connect this pin to the inductor.
NC
No connection
No Internal Connection.
PGOOD
Power good indicator
Power Good Indicator. This pin is an open drain logic output. The
PGOOD will be pulled to ground when the output voltage is less
than 90% of the target output voltage.
EN
Enable test point
Enable Control Input. Pull high the EN pin to turn on the converter.
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RT8071CGQW
Evaluation Board
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Power-up & Measurement Procedure
1. Connect input power (2.7V < VIN < 5.5V) and input ground to VIN and GND test pins respectively.
2. Connect 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 “H” option to tie EN test pin to input power
VIN for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for
disabling the device.
4. Verify the output voltage (approximately 1.05V) between VOUT and GND.
5. Connect an external load up to 3A to the VOUT and GND terminals and verify the output voltage and current.
Output Voltage Setting
Set the output voltage with the resistive divider (R3, R5) between VOUT and GND with the midpoint connected to
FB. The output is set by the following formula :
VOUT VFB x (1
R3
)
R5
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RT8071CGQW
Evaluation Board
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Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
PG
TP1
SW
TP2
U1
2
J1
+
C2
0.1uF/0603
18k
SIP-3P
TP3
EN
2
8.2k/0603
GP5
1
Z5
Z6
1
1
FK_1
FK_1
GND
VCC
Z1
1
Z2
1
SIP-1P-M
2
R5
1
1VCC
680pF
GP6
R7
Z3
1
SIP-1P-M
GP4
C9
2
GND
1
1
1
C3
SW-2P
C4
2
22uF/1210
2
22uF/1210
4
DFN-10L 3x3
C1
1
R3
680pF
2
FB
1
NC EC1
2
1
FB
2
EN/FS
1
1
2
3
1
2
3
VCC
Vout
6.2K/0603
2
0.1uF/0603
2
1
JP1
2
10
EN
GND_4
R4
2 VCC
0/0603
C8
1
1
1
C7
2
0.1uF/0603
1
2
10uF/1210
1
2
NC
GP3
C5
0/0603
R6
7
1
SW_7
1.4uH
SW
6
1
1
SW_6
GP2
VOUT
1
VIN
8
1
NC
GND
C6
Vout/3A
L1
PGOOD
1 2
VIN
2 PG 9
R1 100K/0603
3
5
1
GND_5
1
VIN
1
1
GP1
1
Z4
1
SIP-1P-M
GND
SIP-1P-M
Bill of Materials
Reference
Qty
Part Number
Description
Package
Manufacture
U1
1
RT8071CGQW
DC/DC Converter
WDFN-10L 3x3
RICHTEK
C1, C4
2
C3225X5R0J226M
22µF/25V/X5R
1210
TDK
C5
1
C3225X5R0J106M
10µF/50V/X5R
1210
TDK
C6
1
NC
1210
TDK
C3, C9
1
0603B681K500NT
680pF/50V/X7R
0603
WALSIN
C2, C7, C8
3
0603B104K500NT
0.1µF/50V/X7R
0603
WALSIN
EC1
1
NC
1206
JACKSON
L1
1
NR8040T1R4N
1.4µH
R1
1
WR06X1003FT
100k
0603
WALSIN
R3
1
WR06X6201FT
6.2k
0603
WALSIN
R5
1
WR06X8201FT
8.2k
0603
WALSIN
R4, R6
2
WR06X000PT
0
0603
WALSIN
R7
1
WR06X1802FT
18k
0603
WALSIN
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RT8071CGQW
Evaluation Board
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PCB Layout
Top View
Bottom View
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RT8071CGQW
Evaluation Board
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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 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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