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High Efficiency, 36V 100mA Synchronous Step-Down Converter

EVB_RT6208GE

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The RT6208 is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 100mA output current from a 4.5V to 36V input supply. It requires only 25µA typical supply current at no load while maintaining output voltage regulation. The RT6208 achieves Boundary Conduction Mode (BCM) operation, low quiescent current and programmable high-side peak current limit, providing high efficiency over a wide range of load currents. It also provides soft-start protection to eliminate input current surge during start-up. The low current (3µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6208 is available in a SOT-23-6, SOT-23-8 and SOP-8 (Exposed Pad, with power good function) packages.

Purpose

The RT6208 is a high voltage Buck converter that can deliver up to 100mA output current from a wide input voltage range of 4.5V to 36V. This document explains the function and use of the RT6208 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements.


Introduction

General Product Information

The RT6208 is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 100mA output current from a 4.5V to 36V input supply. It requires only 25µA typical supply current at no load while maintaining output voltage regulation. The RT6208 achieves Boundary Conduction Mode (BCM) operation, low quiescent current and programmable high-side peak current limit, providing high efficiency over a wide range of load currents. It also provides soft-start protection to eliminate input current surge during start-up. The low current (3µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6208 is available in a SOT-23-6, SOT-23-8 and SOP-8 (Exposed Pad, with power good function) packages.


Product Feature

  • Achieves Very High Efficiency in Low Load Conditions
  • ±1% High Accuracy Feedback Voltage
  • 4.5V to 36V Input Voltage Range
  • 100mA Output Current
  • Integrated High-Side and Low-Side Switches
  • No Compensation Required
  • Low Quiescent Current
  • Adjustable Peak Current Limit
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Internal Soft-Start
  • Thermal Shutdown Protection

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB051_V1

Default Input Voltage

12V

Max Output Current

100mA

Default Output Voltage

1.8V, 3.3V, 5V Optional

Default Marking & Package Type

RT6208GE, SOT-23-6

Operation Mode

Boundary Conduction Mode (BCM)

Other Key Features

4.5V to 36V Input Voltage Range

Support duty up to 95%

Protection

Cycle-by-Cycle Over Current Protection

Thermal Shutdown



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

Input voltage range = 4.5V to 36V

VOUT

Output voltage

Default output voltage : 1.8V, 3.3V, 5V Optional

Output voltage range = 0.8V to 5V

SW

Switching node test point

SW waveform

EN

Enable test point

Driving the EN pin high (>1.4V) will turn on the device again. Leaving the EN pin floating will pull the EN pin up to 2V internally and enable RT6208.

ISET

High-Side Peak Current Set Pin

A resistor from this pin to GND sets the high-side peak current limit. Leave floating for the maximum peak current, 225mA. Short this pin to GND for the minimum peak current, 50mA.

GND

Ground

Ground



Power-up & Measurement Procedure

1. Apply a 12V nominal input power supply (4.5V < VIN < 36V) to the VIN and GND terminals.

2. There are 2-pin header 1.8V, 3.3V and 5V for output voltage. To use a jumper choose the output voltage level.

3. Verify the output voltage (approximately 1.8V, 3.3, 5.0V) between VOUT and GND.

4. Connect an external load up to 100mA to the VOUT and GND terminals and verify the output voltage and current.



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

C1

1

0603N101J500

100pF/0603

C-0603

WALSIN

C3

1

C2012X7R1H224KT000N

0.22µF/1206/50V

C-1210

TDK

C4

1

GRM31CR71H475KA12L

4.7µF/1206/50V

C-1210

muRata

C9, C10

2

C3225X5R1E226MT

22µF/1206/25V

C-1210

TDK

C12

1

C1608X7R1H104KT000N

0.1µF/0603/50V

C-0603

TDK

Golden Pin

5

SIP-1P-GP

VIN, GND, VOUT

SIP-1P-GP

J1

1

1.8V

SIP-2P

J2

1

3.3V

SIP-2P

J3

1

5V

SIP-2P

L1

1

MSCDRI5010

100µH

5 x 5

Mag.Layer

RFB1

1

0603 750K 1%

750k/0603

R-0603

WALSIN

RFB2

1

0603 143K 1%

143k/0603

R-0603

WALSIN

RFB3

1

CR0603F240KP05

240k/0603

R-0603

EVER OHMS

RFB4

1

0603T-1-604K

604k/0603

R-0603

WALSIN

RSET

1

NC

OPTION/0603

R-0603

R4

1

0603 4R70 1%

4.7R/0603

R-0603

WALSIN

Test Pin

5

EN, SW, FB, VOUT, ISET

sip-1p-tp

U1

1

RT6208GE

DC/DC Converter

SOT-23-6

Richtek



EVB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2015/11/05
Bill of Materials 2015/11/05
Gerber File 2015/11/05
Schematic 2015/11/05
RT6208

高效率 36V, 100mA, 同步降壓型 DC/DC 轉換器

RT6208

RT6208系列為高效率、單晶同步降壓型DC/DC轉換器,在4.75V至36V的輸入電源範圍可提供最高為100mA的輸出電流。在無負載狀態下,僅需25µA來維持輸出電壓調節。RT6208實現了Boundary Conduction Mode (BCM)操作、低靜態電流和可編程的高側峰值電流限制,可於寬負載電流範圍提供高效率。此外,還提供軟啟動保護,以消除在啟動時的輸入電流浪湧。低電流(3µA)關機模式提供了輸出斷接,從而輕鬆實現電池供電系統的電源管理。RT6208提供SOT-23-6和SOT-23-8的封裝。

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