EVB RT6207AHGQUF-00 EN

RT6207AHGQUF
Evaluation Board
your power partner.
5A, 18V, 650kHz, ACOT™ Synchronous Step-Down Converter
Purpose
The RT6207AH is a Advanced Constant On-Time (ACOT™) control architecture step-down converter with the input
voltage range from 4.5V to 18V and provides 5A output current. This document explains the function and use of the
RT6207AH 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.................................................................................................................................................... 8
Important Notice for Richtek Evaluation Board ....................................................................................................... 8
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RT6207AHGQUF
Evaluation Board
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Introduction
General Product Information
The RT6207AH is a high-performance 650kHz, 5A stepdown regulator with internal power switches and
synchronous rectifiers. It features quick transient response using its Advanced Constant On-Time (ACOT™) control
architecture that provides stable operation with small ceramic output capacitors and without complicated external
compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from
0.7V to 8V. The proprietary ACOT™ control improves upon other fast response constant on-time architectures,
achieving nearly constant switching frequency over line, load, and output voltage ranges. Since there is no internal
clock, response to transients is nearly instantaneous and inductor current can ramp quickly to maintain output
regulation without large bulk output capacitance. The RT6297AH is stable with and optimized for ceramic output
capacitors. With internal 60mΩswitches and 22mΩsynchronous rectifiers, the RT6207AH displays excellent
efficiency and good behavior across a range of applications, especially for low output voltages and low duty cycles.
Cycle-by-cycle current limit provides protection against shorted outputs, input under-voltage lock-out,
externally-adjustable soft-start, output under- and over-voltage protection, and thermal shutdown provide safe and
smooth operation in all operating conditions. The RT6207AH is available in the UQFN-13JL 2x3 (FC) package, with
exposed thermal pad.
Product Feature
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Fast Transient Response
Advanced Constant On-Time (ACOT™) Control
4.5V to 18V Input Voltage Range
Adjustable Output Voltage from 0.7V to 8V
5A Output Current
60mΩ Internal High-Side N-MOSFET and 22mΩ Internal Low-Side N-MOSFET
Steady 650kHz Switching Frequency
Up to 95% Efficiency
Optimized for All Ceramic Capacitors
Externally-Adjustable, Pre-Biased Compatible Soft-Start
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Over- and Under-Voltage Protection
Power Good Output
Thermal Shutdown
Key Performance Summary Table
Key Features
Evaluation Board Number : PCB057_V1
Default Input Voltage
12V
Max Output Current
5A
Default Output Voltage
1.2V
Default Marking & Package Type
RT6207AHGQUF, UQFN-13JL 2x3 (FC)
Operation Frequency
Steady 650kHz at PWM
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RT6207AHGQUF
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, pleas e 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 and Connected to High-Side MOSFET Drain.
EN
Enable test point
High = Enable. Enable Control Input.
GND
Ground
Ground.
FB
Converter Feedback Input
Connect to output voltage feedback resistor divider.
NC
No Internal Connection
No Internal Connection.
SS
Soft-Start Control
A external capacitor should be connected to GND.
PVCC
Internal regulator output
5V Power Supply Output. A capacitor (typical 1µF) should be
connected to GND.
PGOOD
Power good signal
Open Drain Power Good Output.
BOOT
Bootstrap supply test point
Bootstrap. This capacitor is needed to drive the power switch's
gate above the supply voltage. It is connected between SW and
BOOT pins to form a floating supply across the power switch
driver. A 0.1µF capacitor is recommended for use.
SW
Switch node test point
Connect this pin to an external L-C filter.
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Power-up & Measurement Procedure
1. Apply a 12V nominal input power supply (4.5V < VIN < 18V) to the VIN and GND terminals.
2. Set the jumper at JP2 to connect terminals 2 and 3, connecting EN to VIN through resistor R5, to enable
operation.
3. Verify the output voltage (approximately 1.2V) between VOUT and GND.
4. Connect an external load up to 5A to the VOUT and GND terminals and verify the output voltage and current.
Output Voltage Setting
Set the output voltage with the resistive divider (R2, R3) between VOUT and GND with the midpoint connected to
FB. The output is set by the following formula :
VOUT = VFB × (1 +
R2
)
R3
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Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
Bill of Materials
Reference
Qty
Package
Manufacture
C1, D1, L2
3
C3, C4
2
UMK325BJ106MM-T
10µF/50V/X5R
C-1210
TAIYO
YUDEN
C5
1
C1608X5R1E105KT000E
1µF/25V/X5R
C-0603
TDK
C6, C8, C12
3
C1608X7R1E104KT000N
0.1µF/50V/X7R
C-0603
TDK
C7
1
C1608X7R1E104KT000N
3.9nF/50V/X7R
C-0603
TDK
C9, C10, C11
3
C3225X5R1E226MT
22µF/25V/X5R
C-1210
TDK
J1
1
VIN
Golden pin
J2, J6
2
GND
Golden pin
J3
1
VOUT
Golden pin
L1
1
NRS8030T1R0NJGJ
1.0µH
R2
1
17k
R-0603
R3
1
24k
R-0603
R4, R5
2
100k
R-0603
CP1
1
short
U1
1
EVB_RT6207AHGQUF-00
Part Number
Description
NC
RT6207AHGQUF
January 2016
DC/DC Converter
5
TAIYO
YUDEN
UQFN-13JL 2x3
(FC)
RICHTEK
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RT6207AHGQUF
Evaluation Board
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PCB Layout
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
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PCB Layout—Inner Side (3rd Layer)
Bottom View (4th Layer)
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RT6207AHGQUF
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 TO
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
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