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RT4813A High Efficiency Boost Converter

EVB_RT4813AGQUF

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The RT4813A 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 RT4813A is a Boost converter with the input voltage range from 1.8V to 5.5V and provide an average output current limit range from 2.5A to 3.25A. This document explains the function and use of the RT4813A evaluation board (EVB), and provides information to enable operation, output voltage setting of the evaluation board.

 

Introduction

General Product Information

The RT4813A 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 RT4813A 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 minimum load current of 2.5A. 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
  • Average Output Current Limit Range : 3250mA to 2500mA
  • 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

3.25A

Default Output Voltage

VOUT = 5V

Default Marking & Package Type

RT4813AGQUF, UQFN-9L 2x2 (FC)

 

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

RT4813AGQUF

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
RT4813A

高效率升壓轉換器

RT4813A

RT4813A允許系統使用新的化學組成的電池,當電池電壓低於系統電源IC所需的電壓時,可以提供顯著的能量。通過結合內置的功率電晶體,同步整流和低電源電流,此IC提供了採用鋰離子電池系統一個完整的解決方案。
RT4813A是一個升壓穩壓器,設計用於從單節鋰離子電池提供最小輸出電壓的應用,即使電池電壓低於系統的最小需求電壓。在升壓模式中,輸出電壓調節保證最小負載電流為2.5A。在關斷模式下的靜態電流小於1μA,從而最大程度地延長電池壽命。

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