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500mA, 60V, 350kHz Synchronous Step-Down Converter

EVB_RT6204GSP

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The RT6204 is a 60V, 500mA, 350kHz, high-efficiency, synchronous step-down DC-DC converter with an input-voltage range of 5.2V to 60V and a programmable output-voltage range of 0.8V to 50V. It features current-mode control to simplify external compensation and to optimize transient response with a wide range of inductors and output capacitors. High efficiency can be achieved through integrated N-MOSFETs, and pulse-skipping mode at light loads. With EN pin, power-up sequence can be more flexible and shutdown quiescent current can be reduced to <3µA.
The RT6204 features cycle-by-cycle current limit for over-current protection against short-circuit outputs, and user-programmable soft-start time to prevent inrush current during startup. It also includes input under-voltage lockout, output under-voltage, and thermal shutdown protection to provide safe and smooth operation in all operating conditions.
The RT6204 is available in the SOP-8 (Exposed pad) package.

Purpose

The RT6204 is a 60V, 500mA, 350kHz, high-efficiency, synchronous step-down DC-DC converter with an input-voltage range of 5.2V to 60V and a programmable output-voltage range of 0.8V to 50V. This document explains the function and usage of the RT6204GSP evaluation board (EVB), and provides information for power-up operation, and the modification of the evaluation board and the circuit, to be suitable for individual requirements.


Introduction

General Product Information

The RT6204 is a 60V, 500mA, 350kHz, high-efficiency, synchronous step-down DC-DC converter with an input-voltage range of 5.2V to 60V and a programmable output-voltage range of 0.8V to 50V. It features current-mode control to simplify external compensation and to optimize transient response with a wide range of inductors and output capacitors. High efficiency can be achieved through integrated N-MOSFETs, and pulse-skipping mode at light loads. With EN pin, power-up sequence can be more flexible and shutdown quiescent current can be reduced to <3µA.

The RT6204 features cycle-by-cycle current limit for over-current protection against short-circuit outputs, and user-programmable soft-start time to prevent inrush current during startup. It also includes input under-voltage lockout, output under-voltage, and thermal shutdown protection to provide safe and smooth operation in all operating conditions.

The RT6204 is available in the SOP-8 (Exposed pad) package.


Product Features

  • 0.8V Feedback Reference Voltage with ±1.5% Accuracy
  • Wide Input Voltage Range : 5.2V to 60V
  • Output Current : 500mA
  • Integrated N-MOSFETs
  • Current-Mode Control
  • Fixed Switching Frequency : 350kHz
  • Programmable Output Voltage : 0.8V to 50V
  • Low <3µA Shutdown Quiescent Current
  • Up to 92% Efficiency
  • Pulse-Skipping Mode for Light-Load Efficiency
  • Programmable Soft-Start Time
  • Cycle-by-Cycle Current Limit Protection
  • Input Under-Voltage Lockout, Output Under-Voltage and Thermal Shutdown Protection

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB073_V2

Input Voltage Range

5.2V to 60V

Max Output Current

500mA

Default Output Voltage

5V

Default Marking & Package Type

RT6204GSP, SOP-8 (Exposed pad)

Operation Frequency

Fixed 350kHz



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at 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 Name

Description

VIN

Input Voltage

Supply voltage input, 5.2V to 60V. Bypass VIN to GND with a large high-quality capacitor.

EN

Enable

Enable control input. A logic High (VEN > 1.35V) enables the device, and a logic Low (VEN < 0.925V) shuts down the device.

GND

Ground

Power ground. The exposed pad must be connected to GND and well soldered to the input and output capacitors and a large PCB copper area for maximum power dissipation.

SS

Soft-Start Control

Soft-start capacitor connection node. Connect an external capacitor from SS to GND to set the soft-start time. Do not leave SS pin unconnected. A capacitor of capacitance from 10nF to 100nF is recommended.

BS

Bootstrap Supply

Bootstrap capacitor connection node for high-side gate driver. Connect a 0.1μF ceramic capacitor from BOOT to SW to power the internal gate driver.

SW

Switch Node

Switch node for output inductor connection.

FB

Feedback Voltage Input

Feedback voltage input. Connect FB to the midpoint of the external feedback resistor divider to sense the output voltage. The device regulates the FB voltage at 0.8V (typical) Feedback Reference Voltage.

COMP

Compensation Node

Compensation node for the compensation of the regulation control loop. Connect a series RC network from COMP to GND. In some cases, another capacitor from COMP to GND may be required.



Power-Up & Measurement Procedure

1. Apply a 36V nominal input power supply (VIN < 60V) to the VIN and GND terminals.

2. Set the jumper at J5 to connect terminals 1 and 2, connecting EN to enable operation.

3. Verify the output voltage (approximately 5V) between VOUT and GND.

4. Connect an external load up to 500mA 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 voltage can be set by the following equation :

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

Manufacturer

U1

1

RT6204GSP

DC-DC Converter

SOP-8 (Exposed pad)

RICHTEK

C2

1

0603B682K500

6.8nF/50V/X7R

C-0603

WALSIN

C8, C12, C13

3

C1608X7R1H104KT000N

0.1µF/50V/X7R

C-0603

TDK

C3, C4

2

GRM31CR72A225KA73L

2.2µF/100V/X7R

C-1206

MURATA

C9, C10

2

C3216X5R1H106KT000N

10µF/50V/X5R

C-1206

TDK

C11

1

0603N470J500

47pF/50V/NPO

C-0603

WALSIN

L1

1

7447714101

100µH/1.5A

10x10x5 (mm)

Wurth

R2

1

52.3k

R-0603

R3

1

10k

R-0603

R4

1

24k

R-0603

R5, R9

2

100k

R-0603

R10

1

0

R-0603

R8, C1, C5, C6, C7, EC1, D1, L2

8

NC



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2016/07/18
Bill of Materials 2016/07/18
Gerber File 2016/07/18
Schematic 2016/07/18
RT6204

500mA, 60V, 350kHz 同步降壓型DC-DC轉換器

RT6204

RT6204為具有輸入電壓5.2V~60V及可編程輸出電壓0.8V~50V的60V、500mA、350kHz高效率同步降壓型DC-DC轉換器。電流模式的控制方式可簡化外部補償,並可搭配寬範圍的電感和輸出電容來優化瞬態響應。高效率可藉由集成的N-MOSFET以及輕負載時的脈衝跳躍模式來實現。由於具備EN引腳,使得上電時序可更加靈活及關機靜態電流可降至小於3μA。
RT6204擁有逐週期電流限制的過電流保護,防止短路輸出,用戶可編程軟啟動時間以防止啟動時的浪湧電流。它還包括輸入欠壓鎖定,欠壓輸出和過溫保護,讓IC在所有工作條件下可以安全和平穩的操作。
RT6204採用SOP-8(裸露焊盤)封裝。

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