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5A, 18V, 650kHz, ACOT™ Synchronous Step-Down Converter

EVB_RT6207AHGQUF

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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.

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.


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

  • 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



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

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)

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.



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 :

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Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

C1, D1, L2

3

NC

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

TAIYO YUDEN

R2

1

17k

R-0603

R3

1

24k

R-0603

R4, R5

2

100k

R-0603

CP1

1

short

U1

1

RT6207AHGQUF

DC/DC Converter

UQFN-13JL 2x3 (FC)

RICHTEK



PCB Layout

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Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

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PCB Layout—Inner Side (3rd Layer)

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Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2016/01/14
Bill of Materials 2016/01/14
Gerber File 2016/01/14
Schematic 2016/01/14
Part NumberFree SampleBuy From Authorized Distributor
EVB_RT6207AHGQUF Not available Buy from Distributor
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