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Linear Single Cell Li-Ion Battery Charger IC for Portable Applications

EVB_RT9536HGQW

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The RT9536H is a fully integrated single cell Li-ion battery charger IC ideal for portable applications. The RT9536H optimizes the charging task by using a control algorithm including pre-charge mode, fast charge mode and constant voltage mode. The input voltage range of the VIN pin can be as high as 28V. When the input voltage exceeds the OVP threshold, it will turn off the charging MOSFET to avoid overheating of the chip. In RT9536H, the maximum charging current can be programmed with an external resistor. For USB application, the user can set the current to 100mA/500mA through the EN/SET pin. For the factory mode, the RT9536H can allow 4.25V or 4.4V/2.3A power pass through to support system operation. It also provides a 50mA LDO to support the power of peripheral circuit. The internal thermal feedback circuit regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9536H provides protection functions such as under voltage protection, over voltage protection for VIN supply and thermal protection for battery temperature. The RT9536H is available in a WDFN-10L 3x2 package to achieve optimized solution for PCB space and thermal considerations.

Purpose

The RT9536H is a fully integrated single cell Li-ion battery charger IC ideal for portable applications. This document explains the function and use of the RT9536H 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 RT9536H is a fully integrated single cell Li-ion battery charger IC ideal for portable applications. The RT9536H optimizes the charging task by using a control algorithm including pre-charge mode, fast charge mode and constant voltage mode. The input voltage range of the VIN pin can be as high as 28V. When the input voltage exceeds the OVP threshold, it will turn off the charging MOSFET to avoid overheating of the chip.

In RT9536H, the maximum charging current can be programmed with an external resistor. For USB application, the user can set the current to 100mA/500mA through the EN/SET pin. For the factory mode, the RT9536H can allow 4.25V or 4.4V/2.3A power pass through to support system operation. It also provides a 50mA LDO to support the power of peripheral circuit. The internal thermal feedback circuit regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9536H provides protection functions such as under voltage protection, over voltage protection for VIN supply and thermal protection for battery temperature.

The RT9536H is available in a WDFN-10L 3x2 package to achieve optimized solution for PCB space and thermal considerations.


Product Feature

  • 28V Maximum Rating for DC Adapter
  • Internal Integrated Power MOSFETs
  • Support 4.25V or 4.4V/2.3A Factory Mode
  • 50mA Low Dropout Voltage Regulator
  • Status Pin Indicator
  • Programmer Charging Current
  • Under Voltage Lockout
  • Over Voltage Protection
  • Thermal Feedback Optimized Charge Rate
  • RoHS Compliant and Halogen Free

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB053_V1

Default Input Voltage

5V

Max Output Current

1.2A

Default Output Voltage

4.25V

Default Marking & Package Type

RT9536HGQW, WDFN-10L 3x2



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to 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

Power input. Support 4.75V to 5.5V Input Voltage.

GND

Ground

Ground.

LDO

LDO output

LDO Output (4.9V). This pin provides 50mA output current.

CHGSB

Indicator Output for Charging Status

The CHGSB pin indicate the charger status. During the charging process, the CHGSB pin is pulled low. When the charger is under charge done condition or abnormal condition, the CHGSB will be high impedance.

PGB

Indicator Output for Power Status

The PGB pin indicates the input power status at VIN pin. When the input power is normal, the PGB pin is pulled low.

BATT

Batttery Charge Current Output

Charger output for battery.

ENB

Enable Control Input

Enable and Operation Mode and VOUT Regulation Voltage Setting.



Power-up & Measurement Procedure

1. Connect input power (4.75V < VIN < 5.5V) to VIN test pin.

2. Connect one cell li-ion battery positive and negative terminals to BATT and GND test pin.

3. Pull low to ENB test pin.

4. Verify the LED1 and LED2 whether to light and get charger status.

5. Measure output voltage (approximately 0~4.25V) between BATT and GND.


Specification

Parameter

Symbol

Min

Typ

Max

Units

Battery Voltage Regulation

(CV = 4.25V)

VREG

4.186

4.25

4.313

V

(CV = 4.4V)

4.356

4.4

4.444

VIN Charge Setting Range

(ISET Mode)

ICHG

0.9

1

1.1

A

(USB100)

90

95

100

mA

(USB500)

380

395

410

mA

Over Voltage Protection

VOVP

6.7

6.9

7.1

V



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT9536HGQW

Battery Charge IC

WDFN-10L 3x2

RICHTEK

C2, C3, C6

3

C0603X5R1E225DT

1µF/25V/X5R

0603

TDK

LED1, LED2

2

DIP LED

LED_Red

DIP

R10, R11

2

RC0603FR

300Ω/0603

0603

YAGEO

VR1, VR2

2

5kΩ (可變電阻)

C1, C4, C5, C7

4

NC

0603

R9, R12, R13, R14

4

NC

0603

D1, M1

2

NC



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2016/01/15
Bill of Materials 2016/01/15
Gerber File 2016/01/15
Schematic 2016/01/15
RT9536H

Linear Single Cell Li-Ion Battery Charger IC for Portable Applications

RT9536H

The RT9536H is a fully integrated single cell Li-ion battery charger IC ideal for portable applications. The RT9536H optimizes the charging task by using a control algorithm including pre-charge mode, fast charge mode and constant voltage mode. The input voltage range of the VIN pin can be as high as 28V. When the input voltage exceeds the OVP threshold, it will turn off the charging MOSFET to avoid overheating of the chip.

In RT9536H, the maximum charging current can be programmed with an external resistor. For USB application, the user can set the current to 100mA/500mA through the EN/SET pin. For the factory mode, the RT9536H can allow 4.25V or 4.4V/2.3A power pass through to support system operation. It also provides a 50mA LDO to support the power of peripheral circuit. The internal thermal feedback circuit regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9536H provides protection functions such as under voltage protection, over voltage protection for VIN supply and thermal protection for battery temperature.

The RT9536H is available in a WDFN-10L 3x2 package to achieve optimized solution for PCB space and thermal considerations.

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EVB_RT9536HGQW Not available Buy from Distributor
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