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RT4813 High Efficiency Boost Converter

EVB_RT4813GQUF

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The RT4813 allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current; this IC provides a compact solution for systems using advanced Li-Ion battery chemistries.

Purpose

The RT4813 is a Boost converter with the input voltage range from 1.8V to 5.5V and provide an average output current limit range from 0.55A to 3.1A. This document explains the function and use of the RT4813 evaluation board (EVB), and provides information to enable operation, output voltage setting of the evaluation board.

 

Introduction

General Product Information

The RT4813 allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current; this IC provides a compact solution for systems using advanced Li-Ion battery chemistries.

The RT4813 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 3.1A. Quiescent current in Shutdown Mode is less than 1µA, which maximizes battery life.

 

Product Feature

  • CMCOT Topology and Small Output Ripple when VIN Close VOUT Voltage
  • Operates from a Single Li-ion Cell : 1.8V to 5.5V
  • Adjustable Output Voltage : 1.8V to 5.5V
  • PSM Operation
  • Up to 96% Efficiency
  • Input Over Current Limit
  • Input/Output Over Voltage Protection
  • Programmable Average Output Current Limit Range : 3100mA to 550mA
  • Internal Compensation
  • Output Discharge
  • Output Short Protection
  • True Load Disconnect

 

Key Performance Summary Table

Key Features

Evaluation Board Number: PCB090_V1

Default Input Voltage

3.6V

Max Output Current

3.1A

Default Output Voltage

VOUT = 5V

Default Marking & Package Type

RT4813GQUF, UQFN-9L 2x2 (FC)

 

Bench Test Setup Conditions

Headers Description and Placement

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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

Comment (expected waveforms or voltage levels on test points)

VIN

Input voltage

Input voltage with range 1.8V to 5.5V.

EN

VOUT Enable

Enable control pin for VOUT.

SW

Switching Node

Switching Node.

PGND/GND

Ground

Ground.

SDA/SCL

I2C Control

Pins to set functions such as ILIM_OFF / IPCHG.

VOUT

Output Voltage

Default voltage : 5V ± 1%.

FB

Feedback Voltage

Default voltage : 0.5V ± 1%.

 

Power-up & Measurement Procedure

1. Connect input voltage (1.8V < VIN < 5.5V).

2. To use a jumper at “H” option to tie EN pin to input voltage VIN via JP1 or external voltage for enabling the device. Inversely, to use a jumper at “L” option to tie EN pin to ground GND for disabling the device.

3. To verify the output voltage VOUT via the dividing resistors.

4. To connect an external load up to 1A and verify the output voltage and current.

 

I2C Register Setting

The register as the table shown can be programmed by a MCU through the dedicated I2C interface. The device slave address is 0x39.

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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

RT4813GQUF

Boost Converter

UQFN-9L 2x2 (FC)

Richtek

C1, C2, C3, C4

4

GRM21BR61A226ME51

22µF/10V/X7R/0805

C-0805

Murata

C5

1

GRM185R61C105KE44D

1µF/16V/X5R/0603

C-0603

Murata

C6

1

GRM32ER61A107ME20L

100µF/10V/X5R/1210

C-1210

Murata

L1

1

SPM6530T-1R5M100

1.5µH

L-SH8018

TDK

R1

1

PFR059093FNH

909K/0402/1%

R-0402

乾坤

R2

1

PFR05104FNH

100K/0402/1%

R-0402

乾坤

 

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 2017/07/26
Bill of Materials 2017/07/26
Gerber File 2017/07/26
Schematic 2017/07/26
RT4813

高效率升壓轉換器

RT4813

RT4813能讓電子系統充分發揮新型化學電池的優勢,它在電池電壓低於系統電源 IC 需要的電壓時還能供足夠的能量供其使用。它內含功率電晶體、同步整流器,電流消耗低,為使用鋰離子電池供電的系統提供了一個結構緊湊的解決方案。
即使電池電壓已經低於系統要求的最低電壓,RT4813內含的Boost轉換器也能提供足夠的電壓供系統使用。在升壓模式下,其輸出電壓精度在最大3.1A負載下也能得到保證。在關機模式下,它的電流消耗低於2μA,可使電池壽命得到最大化延長。

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