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10A, 18V, 500kHz, ACOT™ Synchronous Step-Down Converter

EVB_RT2810BHGQUF

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The RT2810B is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. The ACOT™ provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.5V to 18V. The proprietary circuit of the RT2810B enables to support all ceramic capacitors. The output voltage can be adjustable between 0.7V and 8V. The soft-start time is adjustable by an external capacitor.

Purpose

The RT2810B is an Advanced Constant On-Time (ACOT™) mode step-down converter with the input voltage range from 4.5V to 18V and provides 10A output current. This document explains the function and use of the RT2810B 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 RT2810B is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. The ACOT™ provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.5V to 18V. The proprietary circuit of the RT2810B enables to support all ceramic capacitors. The output voltage can be adjustable between 0.7V and 8V. The soft-start time is adjustable by an external capacitor.


Product Feature

  • 4.5V to 18V Input Voltage Range
  • 10A Output Current
  • 12mΩ Internal High-Side N-MOSFET and 5.4mΩ Internal Low-Side N-MOSFET
  • Advanced Constant On-Time Control
  • Fast Transient Response
  • Support All Ceramic Capacitors
  • Up to 95% Efficiency
  • Adjustable Switching Frequency from 300kHz to 700kHz
  • Adjustable Output Voltage from 0.7V to 8V
  • Adjustable Soft-Start
  • Pre-bias Start Up
  • Adjustable Current Limit from 6A to 16A
  • Cycle-by-Cycle Over Current Protection
  • Power Good Output
  • Input Under-Voltage Lockout
  • Hiccup Mode Under-Voltage Protection

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB055_V1

Default Input Voltage

12V

Max Output Current

10A

Default Output Voltage

1.4V

Default Marking & Package Type

RT2810BHGQUF, UQFN-16JL 3x3 (FC)

Operation Frequency

Steady 500kHz at all loads



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)

PVCC

Internal Regulator Output

5V bias supply output. Connect a 1µF capacitor to ground.

SS

Soft-Start Time Setting

Soft-Start Time Setting. An external capacitor should be connected between this pin and GND.

VIN

Input voltage

Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a suitably large ceramic capacitor.

GND

Ground

Ground.

PG

Power Good Indicator

Power Good Indicator Open-Drain 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.

EN

Enable Control Input

A logic-high enables the converter; a logic-low forces the IC into shutdown mode reducing the supply current to less than 10µA.



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 R4, to enable operation.

3. Verify the output voltage (approximately 1.4V) between VOUT and GND.

4. Connect an external load up to 10A to the VOUT and GND terminals and verify the output voltage and current.



Output Voltage Setting

Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula :

Technical Document Image Preview



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT2810BHGQUF

DC/DC Converter

UQFN-16JL 3x3 (FC)

RICHTEK

C1

1

NA

C-0603

C3, C4

2

UMK325BJ106MM

10µF/50V/X5R/1210

C-1210

TAIYO YUDEN

C5

1

C1608X5R1E105KT000E

1µF/25V/X5R/0603

C-0603

TDK

C6, C8, C12

3

C1608X7R1H104KT000N

0.1µF/50V/X7R/0603

C-0603

TDK

C7

1

0603B103K500

10nF/50V/X7R/0603

C-0603

WALSIN

C9

1

C3225X5R1E226MT

22µF/25V/X5R/1210

C-1210

TDK

C10, C11

2

C3225X5R1E226MT

22µF/25V/X5R/1210

C-1210

TDK

L1

1

7443340100

1.0µH/17A

8.4 x 7.9 x 7.2mm

Wurth Elektronik

L2

1

NA

R1, R2

2

20k

R-0603

R6

1

150k

R-0603

R7

1

80k

R-0603

R3, R4

1

100k

R-0603



PCB Layout

Technical Document Image Preview

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 2015/12/25
Bill of Materials 2015/12/25
Gerber File 2015/12/25
Schematic 2015/12/25
RT2810A/RT2810B

10A, 18V, 500kHz ACOT® 同步降压型转换器

RT2810A/RT2810B

RT2810A/B 是一款ACOT(Advanced Constant On-Time)操作模式的同步降压型DC/DC转换器。先进固定导通时间(ACOT®)控制架构仅须外加少数的组件即可达到快速的瞬时响应特性,内建的低阻抗MOSFET可在输入电压范围4.5V至18V内提供高效率的操作状态,专有的 ACOT® 模式控制电路可支持所有的的陶瓷电容设计,输出电压可调范围0.7V至8V,可藉由外部电容调整设计缓启动的时间。

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