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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)

Title Last Update Share Download
Evaluation Board User Guide 2018/04/16
Bill of Materials 2018/04/16
Schematic 2018/04/16
Gerber File 2018/04/16
RT9465

從屬式開關模式單節鋰離子電池充電IC

RT9465

RT9465是供可擕式設備使用的開關模式單節鋰離子/聚合物電池充電IC,含有同步架構PWM控制器和精確的電壓調節電路以及用於充電電流檢測的集成化電阻。
RT9465的控制演算法經過優化,可根據預充電、快速充電 (恆壓充電和恆流充電) 等不同的充電模式改變充電參數,關鍵的充電參數可通過I2C介面進行程式控制。通過I2C介面也可對其溫度進行監控。
RT9465具有欠壓保護、過壓保護 (對VBAT側和VBUS側同時進行)、熱調節、反向漏電保護和最低輸入電壓調節 (MIVR) 等特性。
RT9465採用WQFN-16L 3x3封裝。

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