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3A Single Cell Li-Ion Battery Slave Switching Charger

EVB_RT9465GQW

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The RT9465 is a switch-mode single cell li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, and high accuracy voltage regulation. Besides, the charging current is regulated through the integrated sensing resistors.

Purpose

The RT9465 is a switch-mode single cell li-Ion/Li-Polymer battery charger for portable applications. It intergrates a synchronous PWM controller, and high accuracy voltage regulation. Besides, the charging current is regulated through the integrated sensing resistors. This document explains the function and use of the RT9465 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 RT9465 is a switch-mode single cell li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, and high accuracy voltage regulation. Besides, the charging current is regulated through the integrated sensing resistors.


Product Feature

  • Input Voltage Range : 3.9V to 14V
  • Synchronous 1.5MHz/0.75MHz Switching Frequency 95% Max. Duty
  • Up to 92%/94% Peak Efficiency at VIN = 9V/5V
  • VIN Over-Voltage Protection : 14.5V
  • VIN Under-Voltage Protection : 3.8V
  • VIN Under-Voltage-Lock-Out : 3.3V
  • Fault Detection (VIN and VBAT Monitoring)
  • INT Output for Communication with I2C
  • Programmable Minimum Input Voltage Range : 3.9V to 13.4V (0.1V/Step)
  • Programmable Battery Voltage Regulation Range : 3.8V to 5.06V (0.02V/Step)
  • Programmable End of Charge Range : 0.6A to 1.6A (0.1A/Step)
  • Programmable Average Output Current Regulation Range : 0.6A to 3A (0.1A/Step)
  • Junction Temperature Monitor : 60°C to 116°C (4°C/Step)
  • VIN Minimum Input Voltage Regulation (MIVR) : ±3%
  • Battery CV (Constant Voltage) Regulation : ±1%
  • Output CC (Constant Current) Regulation, Output Current < 1A : ±100mA (VBUS = 9V/12V)
  • Output CC (Constant Current) Regulation, Output Current > 1A : ±10% (VBUS = 9V/12V)
  • Junction Temperature Monitor : ±3°C
  • Thermal Shutdown : 160°C

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB096_V1

Input Voltage

3.9V to 14V

Output Voltage

3.8V to 5.06V

Max Output Current

3A

Package Type

RT9465GQW, WQFN-16L 3x3 (W-Type)



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

Comment (expected waveforms or voltage levels on test points)

VIN

Input Voltage

DC input power supply

VOUT

Output Voltage

Battery connection point to positive terminal of the battery pack.

GND

Ground

Ground.

BAT+

Positive Battery Voltage Sense

Positive battery voltage sense. Conect to battery connector.

BAT-

Negative Battery Voltage Sense

Negative battery voltage sense. Conect to battery connector.

EN

Enable Pin

Device enable control pin. Pull low to disable device. I2C not available

when disabled.

INT

Intterrupt

Open drain interrupt output. connect to pull-up voltage via 10kΩ pull-up resistor. Normally high, the INT pin sends an active low.

SDA

SDA

I2C interface data. Connect to pull-up voltage via 10kΩ pull-up resistor.

SCL

SCL

I2C interface clock. Connect to pull-up voltage via 10kΩ pull-up resistor.

LX

Switch node

Switch node. Connect to an external inductor

EXTRNAL

External Pull Up Voltage

External pull up voltage. Connect to power supply

REG

REG

PWM low-side driver and bootstrap power supply.

BOOT

BOOT

Bootstrap supply for high-side MOSFET. Connect a capacitor between BOOT and LX.



Power-up & Measurement Procedure

1. Connect input power (5V < VBUS < 14V) and input ground to VIN and GND test pins respectively.

2. Connect positive end and negative terminals of VBAT to VOUT and GND test pins respectively.

3. There is a 3-pin header (JP3) for pull-up control. To use a jumper at “EXTRNAL” option to tie pull up pin to external pull up voltage. Use a jumper at “BAT+” option to tie pull-up test pin to battery.

4. Connect EN pin to 3.3V to enable device and use I2C to enable charger.



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

RT9465GQW

Switching Charger

WQFN-16L 3x3

RICHTEK

C1

1

GRM155R61E225KE11

2.2µF/25V/X5R

C-0402

muRata

C2

1

GRM155R60J475ME47

4.7µF/6.3V/X5R

C-0402

muRata

C4

1

GRM188R61A106KE69

10µF/10V/X5R

C-0603

muRata

C5

1

GRM033R61C473KE84

47nF/16V/X5R

C-0201

muRata

L1

1

DFE252012F-1R0M

1µH

2.5x2.0x1.2mm

muRata

R1, R2, R3

3

NCP15XH103F03RC

10k

R-0402

muRata



PCB Layout

Technical Document Image Preview

Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

Technical Document Image Preview

PCB Layout—Inner Side (3rd Layer)

Technical Document Image Preview

Bottom View (4th Layer)

RT9465

3A Single Cell Li-on Battery Slave Switching Charger

RT9465

The RT9465 is a switch-mode single cell li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller and high accuracy voltage regulation. Besides, the charging current is regulated through the integrated sensing MOSFET.

The RT9465 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including fast charge mode and constant voltage mode. The key charge parameters are programmable via the I2C interface. The junction temperature is monitored by ADC.

Other features include under-voltage protection, over- voltage protection (including VBAT and VIN side), thermal regulation and MIVR.

The RT9465 is available in a WQFN-16L 3x3 package.

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