Intersil ISL6298EVAL2 Applications Manual

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ISL6298EVAL2 Evaluation Board

Application Manual

Application Note AN1172.0February 9, 2005

Description

The ISL6298EVAL2 provides a complete platform for the evaluation of the ISL6298-2CR4. The on board 9-bit DIP switch facilitates programming charging current, setting EN input, battery thermal status, and so on. The four jumpers can set up input source selection, USB mode selection, and can be used to make other necessary connections.

Assembled in the center, the components constitute a complete charger solution, demonstrating the space saving advantage of the ISL6298 in limited space applications.

LEDs connected to FAULT and STATUS pins will indicate the normal charging status or fault condition.

On board jumpers and a DIP switch accommodate different operation conditions for the charger.

Ordering Information

PART # DESCRIPTION

ISL6298EVAL2 Evaluation Board for the ISL6298-2CR4

Features:

• 9-bit DIP switch for conveniently setting up charging current, battery thermal status, EN input, and so on

• Different jumpers for input source selection, USB mode selection, and the convenience of current measurement

• Exposed soldering pads connected to STATUS, FAULT, TIME, EN, V2P8, IMIN and TEMP functional pins to accommodate experimental testing that need extra connections to those pins

• Board size 3.5 x 2.5 square inches for the convenience of evaluation

• Eight thermal vias in the thermal pad simulating the customers’ thermal enhanced environment

Pinout

ISL6298 (16 LEAD QFN)

TOP VIEW

VIN

VBAT

12 11 10

6578

V2P8

TOEN

VBAT TEMP IMIN IREF

VIN

FAULT

STATUS

TIME

16 14 13

15 1 2 3 4

GND

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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Application Note 1172

What is inside

The Evaluation Kit contains:

• ISL6298EVAL2 board

• The ISL6298 Data Sheet

• This ISL6298EVAL2 Application Note

What is needed

The following instruments will be needed to perform testing:

• Power supplies:

1 PS1: DC 20V/5A, 2 PS2: DC (sinks current) 20V/5A, such as

Agilent 6654A)

• Electronic load: 20V/5A

• Multimeters

• Function generator

• Oscilloscope

• Cables and wires

Quick Setup Guide

Step 1: Switch on bit 4 and bit 7 of the Dip-switch. Leave

all other bits off, (See Figure 1.)

DO NOT APPLY POWER UNTIL STEP 6

BIT DESCRIPTION ON OFF REMARK

JUMPER POSITION FUNCTION

TABLE 1. DIP SWITCH PIN DESCRIPTIONS

Adjustable

TIMEOUT

disable/enable

Charger

enable/disable

4 IREF setting 1 Add 125mA I

5 IREF setting 2 Add 250mA

6 IMIN setting 25mA 12.5mA

7 TEMP normal Normal All off

8 TEMP high Too hot

TEMP low Too cold

USB TO VIN USB input selected

JP1

WALL CUBE TO VIN

Shunt Installed Connect VBAT pin to battery

JP2

shunt installed Battery attached to Thermistor at J2

JP3

not installed Default

IREF and V2P8 Setting USB 255mA mode

JP4

IREF and GND Setting USB 100mA mode

5 hours 50 mins

TIMEOUT disabled

Charger disabled

TABLE 2. JUMPER SETTINGS

Wall adapter input selected

Current meter can replace shunt

3 hours 30 mins

TIMEOUT enabled

Charger enabled

=125mA

CHG

When both off

simulates battery removal

Step 2: Connect 5V on VIN. Step 3: Connect 3.7V on VBAT. Step 4: Connect 500mA electronic load on VBAT. Step 5: Verify that no shunts across all jumpers. Step 6: Turn on Power Supplies and electronic load. Step 7: Green LED should be on, indicating normal

charging operation.

Step 8: If current meter is in series with VIN, it shall read

250mA as the charging current.

O N

O F F

23456789

FIGURE 1. INITIAL DIP SWITCH SETTINGS

DIP Switch Settings

A 9-bit DIP switch is provided to set up voltage, current reference, end-of-charge (EOC) current, and so on. The functionality of the bits are described in Table 1.

Initial Board Jumper Positioning (Refer to Figure 3)

JP1 - Selects the VIN pin to be connected to either a wall adapter, or to a USB connector. If the J1 connector is being used, a shunt must be installed across ‘WALL CUBE TO VIN’, or if the J3 (USB) connector is being used, a shunt must be installed across ‘USB TO VIN’. J1, J3 and JP1 can be ignored if the power supply is connected directly to the VIN test point, which is directly connected to the VIN pin of the IC. A current meter, to measure the input current, can replace the shunt mentioned above.

JP2 - Can connect the VBAT pin to the battery. If the J2 connector is being used, a shunt must be installed across JP2. In this case, a current meter can also replace the shunt to measure the VBAT current.

JP3 - Can connect the TEMP pin to the battery. Usually no shunt is needed for JP3, as the Eval board can simulate various battery thermal conditions. Only when a battery with an attached thermistor is applied on J2 does it become necessary to install a shunt across JP3, simultaneously turning off bits 7, 8, and 9 on the DIP switch.

JP4 - Selects USB modes; a shunt across IREF and V2P8 will set USB 255mA mode, a shunt across IREF and GND will set USB 100mA mode. When the charge current is programmed by the resistors connected to IREF pin, no shunt should be installed on JP4.

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Application Note 1172

FIGURE 2. CONNECTION OF INSTRUMENTS

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Board Layout Information

Schematics of PCB board

Application Note 1172

February 9, 2005

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FIGURE 3. BOARD LAYOUT INFORMATION SCHEMATIC

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Application Note 1172

TABLE 3. ISL6298EVAL2 BILL OF MATERIALS

ITEM QUANTITY REFERENCE PART DESCRIPTION PCB FOOTPRINT PART NUMBER VENDOR

1 1 C1 1µF, 6.3V, X5R ceramic cap 0603 0603X105K6R3 Walsin

2 1 C2 10µF/6.3V, Tantalum Cap 2.05 x 1.3 x 1.2 TAJR106M006 AVX

3 1 C3 15nF/16V, X7R ceramic cap 0402 C1005X7R1C153K TDK

4 1 C4 0.1µF/16V, Y5V ceramic cap 0402 C1005Y5V1C104ZT TDK

5 1 C5 10nF/16V, X7R Ceramic cap 0805 C1005X7R1C103K TDK

6 1 C6 10µF/16V, Tantalum Cap 3.2 x1.6 x 1.6 TAJA106M016 AVX

7 1 D1 Green LED 0805 67-1553-1-ND DigiKey

8 1 D2 Red LED 0805 67-1552-1-ND DigiKey

9 2 R1, R2 1K, 5% 0603 Various

10 1 R3 10K, 1% 0603 Various

11 2 R4, R5 160K, 1% 0603 Various

12 1 R6 160K, 1% 0805 Various

13 1 R7 80K, 1% 0805 Various

14 1 R8 160K, 1% 0805 Various

15 1 R9 5K, 1% 0805 Various

16 1 R10 500, 1% 0805 Various

17 1 R11 18K, 1% 0805 Various

18 1 J1 2.54mm Male Header, 2 ckt (R/A) A23879-ND DigiKey

19 1 J2 2.54mm Male Header, 3 ckt (R/A) A23880-ND DigiKey

20 2 JP1, JP4 2.54mm Male Header, 3ckt WM6403-ND DigiKey

21 2 JP2, JP3 2.54mm Male Header, 2 ckt WM6402-ND DigiKey

22 1 J3 USB receptacle, B type 787780-1-ND DigiKey

23 1 SW1 DIP Switch, 9 Pos, SMT CKN1323-ND DigiKey

24 1 U1 Single-Cell Li-ion Battery Charger 16-pin, 4 x 4 QFN ISL6298 Intersil

25 6 VIN, VBAT,

TIME, GND1, GND2, GND3

Test Point 5002K-ND DigiKey

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PCB Layout

Application Note 1172

SILK SCREEN LAYER INTERNAL (LAYER 2, GND)

BOTTOM (LAYER 4, GND) TOP (LAYER 1, SIGNAL)

INTERNAL (LAYER 3, FLOATING)

Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

AN1172.0

February 9, 2005

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