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Richtek

2A, 18V, 500kHz, ACOT™ Step-Down Converter

EVB_RT6212AHGJ6F

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The RT6212A is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 2A output current from a 4.5V to 18V input supply. The RT6212A adopts ACOT architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over current protection, and thermal shutdown.

Purpose

The RT6212A is a synchronous step-down converter with the input voltage range from 4.5V to 18V and provides 2A output current. This document explains the function and use of the RT6212A 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 RT6212A is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 2A output current from a 4.5V to 18V input supply. The RT6212A adopts ACOT architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over current protection, and thermal shutdown.


Product Feature

  • Integrated 163mΩ/86mΩ MOSFETs
  • 4.5V to 18V Supply Voltage Range
  • 500kHz Switching Frequency
  • ACOT Control
  • 0.8V±1.5% Voltage Reference
  • Internal Start-Up into Pre-biased Outputs
  • Compact Package : TSOT-23-6 Pin
  • Over-Current Protection and Hiccup

 


Key Performance Summary Table

Key Features

Evaluation Board Number : PCB039_V1

Default Input Voltage

12V

Max Output Current

2A

Default Output Voltage

1.2V

Default Marking & Package Type

RT6212AHGJ6F, TSOT-23-6 (FC)

Operation Frequency

Fixed 500kHz



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.

EN

Enable test point

Floating this pin or connecting this pin to GND can disable the device and connecting this pin to logic high can enable the device.

GND

Ground

System Ground. Provides the ground return path for the control circuitry and low-side power MOSFET.

BOOT

Bootstrap supply test point

Bootstrap Supply for High-Side Gate Driver. Connect a 0.1µF or greater capacitor from LX to BOOT to power the high-side switch.

FB

Feedback Voltage Input.

This pin is used to set the desired output voltage via an external resistive divider. The feedback voltage is 0.8V typically.

LX

Switch node test point

LX is the switching node that supplies power to the output and

connect the output LC filter from LX to the output load.



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 enable operation.

3. Verify the output voltage (approximately 1.2V) between VOUT and GND.

4. Connect an external load up to 2A 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 :

Technical Document Image Preview


Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT6212AHGJ6F

DC/DC Converter

TSOT-23-6 (FC)

RICHTEK

C3, C9

2

C3225X5R1E226MT

22µF/25V/X7R

C-1210

TDK

C8

1

C1608X7R1H104K080AA

0.1µF/±10%/50V/X7R

C-0603

TDK

C1, C4, C6, C10, C11, C12, D2

7

N/A

R2

1

12kΩ

R-0603

R3

1

24kΩ

R-0603

R5

1

100kΩ

R-0603

L1

1

7443340220

2.2µH/12.5A

8.4 x 7.9 x 7.2 mm

WE



PCB Layout

Technical Document Image Preview

Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

Technical Document Image Preview

PCB Layout—Inner Side (3rd Layer)

Technical Document Image Preview

Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/10/29
Bill of Materials 2015/10/29
Gerber File 2015/10/29
Schematic 2015/10/29
RT6212A/RT6212B

2A, 18V, 500kHz, ACOT™ 降压型转换器

RT6212A/RT6212B

RT6212A/B 为高效率的DC-DC单片式同步整流转换器,输入电压范围从4.5V至18V,输出电流至2A。RT6212A/B的采用的ACOT架构可增进瞬时响应的表现并固定操作频率。逐周期形式的限流机制可在输出短路时提供电路保护作用,缓启动机制则可消除启动瞬间的输入电流涌浪的问题。此外RT6212A/B提供输出低电压保护、输出过电流与过热关机保护功能。

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