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 Description
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.
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)
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.
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%.
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.
The register as the table shown can be programmed by a MCU through the dedicated I2C interface. The device slave address is 0x39.
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
GRM185R61C105KE44D
1µF/16V/X5R/0603
C-0603
C6
GRM32ER61A107ME20L
100µF/10V/X5R/1210
C-1210
L1
SPM6530T-1R5M100
1.5µH
L-SH8018
TDK
R1
PFR059093FNH
909K/0402/1%
R-0402
乾坤
R2
PFR05104FNH
100K/0402/1%
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
PCB Layout—Inner Side (3rd Layer)
Bottom View (4th Layer)