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RT6266 Step-Down Converter Evaluation Board

EVB_RT6266GSP

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The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter that can deliver up to 2.4A output current from a 7.5V to 36Vinput supply. The RT6266’s current mode architecture with internal compensation is optimized for 5V car charger application over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT6266 also provides output over voltage protection output under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6266 is available in a SOP-8 (Exposed Pad) package.

Purpose

The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter with load line Compensation. This document explains the function and use of the RT6266 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements.

Introduction

General Product Description

The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter that can deliver up to 2.4A output current from a 7.5V to 36Vinput supply. The RT6266’s current mode architecture with internal compensation is optimized for 5V car charger application over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT6266 also provides output over voltage protection output under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6266 is available in a SOP-8 (Exposed Pad) package.

Product Features

  • ±2% High Accuracy Feedback Voltage
  • 7.5V to 36V Input Voltage Range
  • 2.4A Continuous Output Current (2.7A Peak)
  • CC/CV Mode Control
  • Adjustable Load Line Compensation
  • Short Circuit Protection
  • Integrated N-MOSFET Switches
  • Current Mode Control
  • Fixed Frequency Operation : 100kHz
  • Programmable Output Current Limit
  • 110mΩ Internal Power MOSFET Switch
  • Low EMI
  • Up to 95% Efficiency
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection

Application

  • USB Power Supplies
  • Automotive Cigarette Lighter Adapters
  • Power Supply for Linear Chargers
  • DC/DC Converters with Current Limited

Evaluation Board

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

Input voltage range = 7.5V to 36V

VOUT

Output voltage

Output voltage = 5V

CSP

Current Sense Positive Input.

In this RT6266 EVB original setting, the CSP pin of JP1 should be connected short with CSN1 by jumper for normal operation.

CSN

Current Sense Negative Input.

In this RT6266 EVB original setting, the CSN pin of JP2 should be connected short with CSN2 by jumper for normal operation.

Power-up & Measurement Procedure

1. Connect input power (7.5V< VIN < 36V) and input ground to VIN pin.

2. Connect positive end and negative end of load to VOUT pin.

3. The output voltage of (Vout) can be set by R1 and R2.

Vout = VREF * (1+R1/R2)

where VREF = 0.8V (typ.)

Specification

Parameter

Symbol

Min

Typ.

Max

Units

Input Voltage Range

VIN

7.5

36

V

Output Voltage

VOUT

5

V

Oscillator Frequency

fOSC

85

100

115

kHz

Output Current

IOUT

2.4

A

Upper Switch Current Limit

ILIM

4.4

A

Schematic

Technical Document Image Preview

BOM

Reference

Q'ty

P/N

Description

Package

Manufacture

U1

1

RT6266GSP

Step-down converter

SOP-8

RICHTEK

C2, C8, C12

3

C1608X7R1H104K080AA

0.1μF/±10%/50V/X7R

C-0603

TDK

C3, C4

2

C3216X5R1H106K160AB

10μF/±10%/50V/X5R

C-1206

TDK

C1, C5, C6, C7, C10, C13

6

NC

C9

1

GR, E-Cap

470μF/16V

CHI LI TEH

C11

1

C3216X7R1E106K

10uF/±10%/25V/X7R

C-1206

TDK

L1

1

Short

L2

1

MCD110C-390K-LV

39uH

MAG.LAYERS

L3

1

NC

D1

1

CDBA340-G

3A/40V

Comchip

R1

1

180k

R2

1

34.3k

R3

1

100k

R6, R7

2

Short

R17, R18

2

67m

R4, R5, R8

3

NC

PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Step-Down Converter Efficiency Test

Technical Document Image Preview

Title Last Update Share Download
Evaluation Board User Guide 2015/06/29
Bill of Materials 2015/06/29
Gerber File 2015/09/18
Schematic 2015/09/18
RT6266

2.4A, 36V, 100kHz, 負載/輸入電壓調節補償可調的非同步降壓型轉換器

RT6266

RT6266 為高效率,單片式的非同步整流DC/DC轉換器,輸入電壓範圍從7.5V至36V,輸出電流至2.4A。RT6266具有內部補償機制的電流模式架構,為車用5V充電應用中,大範圍負載變化以及輸出電容的最佳化解決方案。逐週期形式的限流機制可在輸出短路時提供電路保護作用,緩啟動機制則可消除啟動瞬間的輸入電流湧浪的問題。此外RT6266提供輸出過電壓保護,輸出低電壓保護與過熱關機保護功能,低電流(<3µA)的關機模式則可斷開與輸出的連接,實現簡易的電池供電系統中的電源管理。RT6266採用SOP-8(裸露焊盤)的封裝規格。

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