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Single Cell Li-Ion Battery Charger Evaluation Board

EVB_RT9527GQW

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The evaluation board demonstrates the RT9527GQW to be designed for a fully integrated low cost single-cell Li-ion battery charger ideal for portable applications. The RT9527GQW optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging current is adjustable via an external resistor. It provides a wide fast-charge current setting from 10mA up to 600mA. The RT9527GQW features 28V maximum rating voltage for VIN and provides protection functions including undervoltage protection and overvoltage protection for the AC adapter supply. Besides, the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures.

General Description

The evaluation board demonstrates the RT9527GQW to be designed for a fully integrated low cost single-cell Li-ion battery charger ideal for portable applications. The RT9527GQW optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging current is adjustable via an external resistor. It provides a wide fast-charge current setting from 10mA up to 600mA. The RT9527GQW features 28V maximum rating voltage for VIN and provides protection functions including undervoltage protection and overvoltage protection for the AC adapter supply. Besides, the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures.



Performance Specifications

The performance specificiaitons of RT9527GQW evaluation board are listed in Table 1. The test conditions are VIN = 5V, VBAT = 4V and TA = 25°C, unless otherwise specified.


Table 1. Performance Specifications of RT9527GQW Evaluation Board

Specification

Test Conditions

Min

Typ

Max

Unit

VIN Operating Range

4.4

--

6

V

VIN Undervoltage Lockout

Threshold

VIN = 0V to 5V

3.1

3.3

3.5

V

VIN Undervoltage Lockout

Hysteresis

VIN = 5V to 0V

--

240

--

mV

Battery Voltage Regulation

0°C to 85°C

4.158

4.2

4.242

V

Re-Charge Threshold

Battery Regulation – Recharge Level

60

100

140

mV

VIN Charging Setting Range

10

--

600

mA

Fast-Charge Current Factor

ICHG_F1 = KCHG_F1 / RISET,

ICHG_F1 = 10mA to 50mA

510

600

690

ICHG_F2 = KCHG_F2 / RISET,

ICHG_F2 = 50mA to 600mA

570

600

630

Pre-Charge Current Factor

ICHG_P = KCHG_P / RISET

30

60

90

BAT Pre-Charge Threshold

VBAT falling

2.7

2.8

2.9

V

BAT Pre-Charge Threshold

Hysteresis

--

200

--

mV

Termination Current Ratio

VBAT > VPREC, ICHG < ITERMI,

Technical Document Image Preview= L to H

5

10

15

%

Overvoltage Protection

6.2

6.5

6.8

V

Overvoltage Protect Hysteresis

--

0.2

--

V

ISET Pin Short Protection

375

500

625

Ω

Thermal Regulation

--

125

--

°C

Pre-Charge Fault Time

CTIMER = 1μF

1440

1800

2160

s

Fast-Charge Fault Time

CTIMER = 1μF

11520

14400

17280

s



Power-up Procedure

Required Equipment

  • RT9527GQW evaluation board
  • DC power supply
  • Electronic load
  • Multimeter
  • Oscilloscope

Quick Test Procedures

Inspect all the components on the EVB and make sure they are undamaged. Do not turn on power supplies until they are connetced well on the EVB.


Equipment setup and the test procedures are stated below:

1) Set power supply#1 voltage = 4V and current = 2A and connect it to VBAT pin through meter and GND pin on the EVB.

2) Connect an e-load with power supply#1 in parallel and sink 1A in CC mode.

3) Set power supply#2 voltage = 5V and current = 1A and connect it to VIN and GND pins on the EVB.

4) Turn on power supply#1 and the electronic load.

5) Turn on power supply#2.

6) Check whether LED1 and LED2 light or not.

7) Use a multimeter to check whether IBAT equals to KCHG_Fx / RISET or not.


Test Environment Diagram

Technical Document Image Preview



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 螢幕擷取畫面, 電子工程, 電子產品 的圖片

自動產生的描述

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

Test points are provided on the EVB and their pin names are listed in the table as shown below.

Test Point/

Pin Name

Pin Function

VIN

Supply voltage input.

VBAT

Charge current output for battery.

GND

Ground.

TS

Battery temperature sense input.

TIMER

Safe-charge timer setting.

ISET

Charge current setting.



Bill of Material

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RT9527GQW

RT9527GQW

Single Cell Li-Ion Battery Charger

WDFN-8L 2x2

RICHTEK

C1, C3, C4

3

0603X105K250CT

1µF

Ceramic Capacitor, 25V/X5R

0603

WALSIN

C2, C5

2

--

NC

--

--

--

C6

1

0603B102K500CT

1nF

Ceramic Capacitor, 50V/X7R

0603

WALSIN

R1, R2

2

WR06X1002FTL

10k

Chip Resistor, 1/10W, 1%

0603

WALSIN

R3

1

WR06X1001FTL

1k

Chip Resistor, 1/10W, 1%

0603

WALSIN

R4

1

RTT035761FTP

5.76k

Chip Resistor, 1/10W, 1%

0603

RALEC

R5

1

RC0603FR-075K1L

5.1k

Chip Resistor, 1/10W, 1%

0603

YAGEO

LED1, LED2

2

LNL-302RD000A1

RED

LED

DIP

LighTop

RT1

1

NCP21XH103F03RC

10k

Chip Resistor, NTC

0805

MURATA



Typical Applications

EVB Schematic Diagram

Technical Document Image Preview


Measurement Result

Charge Current (ICHG = 600mA) vs. Temperature

Charge Current (ICHG = 10mA) vs. Temperature

Technical Document Image Preview

Technical Document Image Preview

Pre-charge Current vs. Battery Voltage

Fast-charge Current vs. Battery Voltage

Technical Document Image Preview

Technical Document Image Preview

Battery Regulation Voltage v.s. Temperature

OVP Threshold Voltage vs. Temperature

Technical Document Image Preview

Technical Document Image Preview

Charge Current vs. RISET

Technical Document Image Preview

Charge On/Off Control from VIN

VIN Overvoltage Protection

Technical Document Image Preview

Technical Document Image Preview

TS Inserted/Removed

VIN Hot-Plug with Battery and NTC

Technical Document Image Preview

Technical Document Image Preview



Evaluation Board Layout

The layout of RT9527GQW evaluation board is shown in Figure 1 and Figure 2. It is a two-layer PCB with 1 oz. Cu coated on both top and bottom sides and the PCB size is 70mm x 50mm.

一張含有 螢幕擷取畫面, 圓形, 電子產品, 文字 的圖片

自動產生的描述

Figure 1. Top View (1st layer)


一張含有 螢幕擷取畫面, 圓形, 文字, Rectangle 的圖片

自動產生的描述

Figure 2. Bottom View (2nd layer)

Title Last Update Share Download
Evaluation Board User Guide 2023/06/01
Bill of Materials 2023/06/01
Schematic 2023/06/01
Gerber File 2023/06/01
RT9527
RT9527

The RT9527 is a low cost single-cell Li-ion charger for low current charge applications.

The RT9527 can be powered up from an AC adapter or USB (Universal Serial Bus) port inputs. The RT9527 enters sleep mode when VIN power is removed. The RT9527 optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging task is kept in constant voltage mode to hold the battery in a full charge condition. The charge current is adjustable via an external resistor. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9527 features 28V maximum rating voltages for VIN. Other features include under voltage protection and over voltage protection for the AC adapter supply.

The RT9527 is available in a WDFN-8L 2x2 package. The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.

Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT9527GQW Digikey 5 Buy
Mouser 0 Lead-Time: 14 weeks
IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT9527GQWWDFN2x2-82,500 Request Digikey 2,834 Buy
Mouser 0 Lead-Time: 14 weeks
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