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1A, 1.5MHz, 5.5V CMCOT Synchronous Step-Down Converter

EVB_RT5710CHGQW

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The RT5710C is a high efficiency synchronous step-down DC/DC converter. Its input voltage range is from 2.5V to 5.5V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 1A of output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The Current Mode Constant-On-time (CMCOT) operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

Purpose

The RT5710C is a synchronous step-down converter with the input voltage range from 2.5V to 5.5V and provides 1A output current. This document explains the function and use of the RT5710C 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 RT5710C is a high efficiency synchronous step-down DC/DC converter. Its input voltage range is from 2.5V to 5.5V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 1A of output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The Current Mode Constant-On-time (CMCOT) operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors.


Product Feature

  • Efficiency Up to 95%
  • RDS(ON) 160mW HS / 110mW LS
  • VIN Range 2.5V to 5.5V
  • VREF 0.6V with ±2% Accuracy
  • CMCOT™ Control Loop Design for Best Transient Response, Robust Loop Stability with Low-ESR(MLCC) COUT
  • Fixed Soft-Start 1.2ms
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection (UVP Hiccup)
  • Thermal Shutdown Protection
  • Power Saving at Light Load

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB034_V1

Default Input Voltage

3.3V

Max Output Current

1A

Default Output Voltage

1.2V

Default Marking & Package Type

RT5710CHGQW, WDFN-6L 2x2

Operation Frequency

Fixed 1.5MHz



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

Supply Voltage Input.

EN

Enable test point

Enable control input.

GND

Ground

Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation.

IC

No internal connection

FB

Feedback

LX

Switch node test point

Switch node.



Power-up & Measurement Procedure

1. Apply a 3.3V nominal input power supply (2.5V < VIN < 5.5V) to the VIN and GND terminals.

2. Set the jumper at JP1 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 1A 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 :

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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

RT5710CHGQW

DC/DC Converter

WDFN-6L 2x2

RICHTEK

C1, C2

2

GRM31CR71E106KA12L

10μF/25V/X7R

C-1206

MURATA

C3, C5

2

C1608X7R1H104K080AA

0.1μF/±10%/50V/X7R

C-0603

MURATA

C4

1

0603N220J500

22pF/50V/NOP

C-0603

WALSIN

C6

1

GRM31CR71E106KA12L

10μF/25V/X7R

C-1206

MURATA

R1, R2, R3

3

100kW

R-0603

R4

1

N/A

L

1

SR04033R3MSB

3.3μH/2.15A

4.5 x 4 mm

ABC ELECTRONICS



PCB Layout

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Top View (1st layer)

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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 2015/10/27
Bill of Materials 2015/10/27
Gerber File 2015/10/27
Schematic 2015/10/27
RT5710C

1A, 1.5MHz, 6V CMCOT Synchronous Step-Down Converter

RT5710C

The RT5710C is a high efficiency synchronous step-down DC-DC converter. Its input voltage range is from 2.5V to 6V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 1A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The Current Mode Constant-On-time (CMCOT) operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

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