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5A 1-4 Cell Buck-Boost Switching Battery Charger Evaluation Board

EVB_RT9492GQVF(2)

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The Evaluation Board demonstrates the RT9492GQVF(2) to be designed for a highly-integrated 5A Buck-Boost switch mode battery charge management and system power path management device for 1-4 cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

General Description

The Evaluation Board demonstrates the RT9492GQVF(2) to be designed for a highly-integrated 5A Buck-Boost switch mode battery charge management and system power path management device for 1-4 cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.



Performance Specification Summary

Summary of the RT9492GQVF(2) Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RT9492GQVF(2) Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Supply Input Voltage Range

3.6

--

24

V

Maximum Input Current

--

--

3.3

A

Maximum OTG Current

OTG mode

--

--

3.32

A

Maximum Output Current

(SW2), ISYS

--

--

5

A

Maximum Battery Voltage

--

--

18.8

V

Maximum Charge Current

--

--

5

A

Maximum Discharge Current

--

--

10

A



Power-up Procedure

Suggestion Required Equipments

  • RT9492GQVF(2) Evaluation Board
  • DC power supply capable of 24V, 3.3A
  • Battery simulator capable of 18.8V, 10A
  • Electronic load capable of 10A
  • Oscilloscope

Quick Start Procedures

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made. When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.


1. Use jumpers on JP22 to JP29 to set battery cells and switching frequency for default charging profile.

Battery Cell (s)

Switching Frequency

Jumper No.

1S

1.5MHz

JP22

750kHz

JP23

2S

1.5MHz

JP24

750kHz

JP25

3S

1.5MHz

JP26

750kHz

JP27

4S

1.5MHz

JP28

750kHz

JP29

2. Use jumpers on JP1 and JP2 to connect ACDRV1 and ACDRV2 to the gate driver output from IC. If the external AC-RBFETs are not needed, use jumpers on JP3 and JP4 to bypass them and JP1 and JP2 should be used to connect ACDRV1 and ACDRV2 to GND.

3. Use a jumper on JP8 with Mid-Right side to connect SDRV to the gate driver output from IC. If the external ship FET is not needed, use a jumper on JP5 to bypass it and use JP8 with Mid-Left side to connect SDRV to the capacitor.

4. Use a jumper on JP18 (TS_NORMAL) or JP19 (TS_POTENTIOMETER) for setting TS pin configuration and JP12 for connecting to REGN as pull-up voltage.

5. Use a jumper on JP13 (500mA) or JP14 (1.5A) for ILIM setting and JP21 for controlling HIZ_EN.

6. Use a jumper on JP9 with Mid-Right side to connect BATTERY to BATP when the external Ship FET is adopted. If the external Ship FET is not needed, use a jumper on JP9 with Mid-Left side to connect BATP to VBAT.

7. Use a jumper on JP87 for connecting Type_C_IN on VAC1 or VAC2.


Proper measurement equipment setup and follow the procedure below.

1) With power off, connect input power and ground to VIN1 or VIN2 and PGND respectively.

2) With load off, connect electronic load to SYSTEM and PGND respectively.

3) With power off, connect power and ground to BATTERY and PGND respectively. Turn on battery simulator, then the device is powered up.

4) Use I2C to set registers for charging function and proper protection level.

5) Turn on the input power supply to start charging. Make sure that the power supply voltage is under OVP level.

6) Check the output charging current using a current meter.

7) Once the proper charging current is established observe the output voltage regulation, ripple voltage, efficiency and other performance.

8) For testing SYS load, turns on the electronic load and adjusts SYS current.



Detailed Description of Hardware

Headers Description and Placement

一張含有 電子產品, 電路, 文字, 電子工程 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

The EVB is provided with the test points and pin names listed in the table below.

Test Point/

Pin Name

Function

VAC1

Input voltage for VAC1.

PGND

Ground.

VAC2

Input voltage for VAC2.

SYSTEM

Output voltage for sys.

BATTERY

Battery connection point.

SNS_BATP

External battery positive sense

PD1

USB TYPE-C port.

JP87

TYPE-C USB BUS tied to VAC1 or VAC2 jumper.

JP8

SDRV tied to SHIPFET or 1nF capacitor.

JP31

Pull up for I2C/INT/CE.

JP1

ACDRV1 tied to AC-RBFET1 or GND.

JP2

ACDRV2 tied to AC-RBFET2 or GND.

JP3

VAC1-VBUS short jumper.

JP4

VAC2-VBUS short jumper.

JP5

BAT-BATTERY short jumper.

JP9

BATP tied to BATTERY or BAT.

JP12

REGN for TS circuit pull high jumper.

JP13

Test resistence jumper with 500mA for ILIM_HZ function.

JP14

Test resistence jumper with 1.5A for ILIM_HZ function.

JP17

CE pull low jumper.

JP18

Test resistence jumper with TS_NORMAL for JEITA.

JP19

Test resistence jumper with TS_POTENTIOMETER for JEITA.

JP21

Test resistence jumper for ILIM_HZ function.

JP22

PROG resistence jumper for default set 1S_1.5MHz_2A ICHG.

JP23

PROG resistence jumper for default set 1S_750KHz_2A ICHG.

JP24

PROG resistence jumper for default set 2S_1.5MHz_2A ICHG.

JP25

PROG resistence jumper for default set 2S_750KHz_2A ICHG.

JP26

PROG resistence jumper for default set 3S_1.5MHz_1A ICHG.

JP27

PROG resistence jumper for default set 3S_750KHz_1A ICHG.

JP28

PROG resistence jumper for default set 4S_1.5MHz_1A ICHG.

JP29

PROG resistence jumper for default set 4S_750KHz_1A ICHG.

JP32

STAT_LED enable jumper.

CP1

VAC1-VBUS short pad.

CP2

VAC2-VBUS short pad.

CP4

BAT-BATTERY short pad.

S1

Button for exit ship mode or system reset.


Default Jumper Setting on EVB

Jumper

Description

JP1

Short ACDRV1 to _acdrv1.

JP2

Short ACDRV2 to _acdrv2.

JP8

Short SDRV to MOS.

JP9

Short BATP to BATTERY.

JP12

Short REGN to TS pull-up resistor.

JP18

Short TS to normal temperature resistor.

JP14

Short ILIM for 1.5A.

JP24

For 2 cell/1.5MHz setting.



Bill of Materials

fSW = 1.5MHz

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RT9492GQVF(2)

--

Switching charger

VQFN-29TL 4x4 (FC)

RICHTEK

C6, C8

2

GRM033R61C473KE84

47nF

Capacitor, Ceramic, 16V, X5R

C-0201

MURATA

C14, C15, C18, C32

4

0402B104K500CT

0.1µF

Capacitor, Ceramic, 50V, X7R

C-0402

WALSIN

C35

1

GRM155R60J475ME47D

4.7µF

Capacitor, Ceramic, 6.3V, X5R

C-0402

MURATA

C38, C39, C95, C96, C97

5

GRM188R61E106KA73

10µF

Capacitor, Ceramic, 25V, X5R

C-0603

MURATA

C41

1

0402B102K500CT

1nF

Capacitor, Ceramic, 50V, X7R

C-0402

WALSIN

C98, C99, C100, C101, C102

5

GRM188R6YA106MA73

10µF

Capacitor, Ceramic, 35V, X5R

C-0603

MURATA

D13

1

LNL-190SUG

--

LED_GREEN

LED-0603

LighTop

L2

1

PIMB063T-1R0MS-68

1µH

20%/6.7mΩ

L-7-4X6-8

CYNTEC

PD1

1

C-NBR2L-AK5322

--

USB TYPE-C 3.1

9.24x9.1mm

ADVANCED-CONNECTEK

Q1, Q2, Q3, Q4

4

AONR36366

--

MOS

DFN 3X3 EP

ALPHA & OMEGA SEMICONDUCTOR

Q6

1

AON7528

--

MOS

DFN 3.3X3.3 EP

ALPHA & OMEGA SEMICONDUCTOR

R15

1

WR06X1000FTL

100Ω

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R18

1

CR-02FL6---5K1

5.1kΩ

Resistor, Chip, 1/16W, 1%

R-0402

VIKING

R20

1

RTT032553FTP

255kΩ

Resistor, Chip, 1/10W, 1%

R-0603

RALEC

R21

1

WR06X1273FTL

127kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R23

1

WR06X1003FTL

100kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R24

1

WR06X3012FTL

30.1kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R25, R44, R45

3

WR04X1002FTL

10kΩ

Resistor, Chip, 1/10W, 1%

R-0402

WALSIN

R28

1

WR04X4701FTL

4.7kΩ

Resistor, Chip, 1/16W, 1%

R-0402

WALSIN

R29

1

WR06X3001FTL

3kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R30

1

WR06X4701FTL

4.7kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R31

1

RC0603FR-076K04L

6.04kΩ

Resistor, Chip, 1/10W, 1%

R-0603

YAGEO

R32

1

WR06X8201FTL

8.2kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R33

1

WR06X1052FTL

10.5kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R34

1

WR06X1372FTL

13.7kΩ

Resistor, Chip, 1/10W, 1%

R-0603

WALSIN

R35

1

RTT031742FTP

17.4kΩ

Resistor, Chip, 1/10W, 1%

R-0603

RALEC

R36

1

CR0603F27K0P05Z

27kΩ

Resistor, Chip, 1/10W, 1%

R-0603

EVER OHMS

S1

1

HTS6601H

--

SW-TACT-SWITCH

TACT-BTN

High-Tronics



Typical Applications

EVB Schematic Diagram

Technical Document Image Preview

Technical Document Image Preview

Technical Document Image Preview

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple.

2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.


Measure Result

Power-UP with AC_RB1, VAC1 Plug in

Charging in Buck Mode

Technical Document Image Preview

Technical Document Image Preview

Charging in Boost Mode

Charging in Buck-Boost Mode

Technical Document Image Preview

Technical Document Image Preview

Charging Enabled by CE Pin

Charging Disabled by CE Pin

Technical Document Image Preview

Technical Document Image Preview

1s Battery Charger Efficiency

2s Battery Charger Efficiency

Technical Document Image Preview

Technical Document Image Preview

3s Battery Charger Efficiency

4s Battery Charger Efficiency

Technical Document Image Preview

Technical Document Image Preview

Thermal Image at VIN = 15V, VBAT = 8V, ICHG = 2A

一張含有 文字, 螢幕擷取畫面, 電子藍, 多媒體軟體 的圖片

自動產生的描述


Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.



Evaluation Board Layout

Figure 1 to Figure 4 are RT9492GQVF(2) Evaluation Board layout. This board size is 101.6mm x 109.7mm and is constructed on four-layer PCB, outer layers with 1 oz. Cu and inner layers with 1 oz. Cu.

一張含有 文字, 圖表, 方案, 黑與白 的圖片

自動產生的描述

Figure 1. Top View (1st layer)


一張含有 文字, 螢幕擷取畫面, 黑與白, 圖表 的圖片

自動產生的描述

Figure 2. PCB Layout—Inner Side (2nd Layer)


一張含有 文字, 螢幕擷取畫面, 圖表, 方案 的圖片

自動產生的描述

Figure 3. PCB Layout—Inner Side (3rd Layer)


一張含有 文字, 螢幕擷取畫面, 圖表, 數字 的圖片

自動產生的描述

Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2023/08/16
Bill of Materials 2023/08/16
Schematic 2023/08/16
Gerber File 2023/08/16
RT9492
RT9492

The RT9492 is a highly-integrated 5A Buck-Boost switch mode battery charge management and system power path management device for 1-4 cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

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