ISL6298EVAL2 Evaluation Board Application Manual ® Application Note February 9, 2005 AN1172.0 Description Features: 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. • 9-bit DIP switch for conveniently setting up charging current, battery thermal status, EN input, and so on 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. • 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 Evaluation Board for the ISL6298-2CR4 VBAT VBAT VIN VIN DESCRIPTION 16 15 14 13 VIN 1 12 VBAT FAULT 2 11 TEMP 10 IMIN STATUS 3 9 IREF 1 5 6 7 8 TOEN EN V2P8 TIME 4 GND ISL6298EVAL2 • 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 ISL6298 (16 LEAD QFN) TOP VIEW Ordering Information PART # • Different jumpers for input source selection, USB mode selection, and the convenience of current measurement CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1172 What is inside . The Evaluation Kit contains: TABLE 1. DIP SWITCH PIN DESCRIPTIONS BIT DESCRIPTION ON OFF 1 Adjustable TIMEOUT 5 hours 50 mins 3 hours 30 mins • This ISL6298EVAL2 Application Note 2 TIMEOUT disable/enable TIMEOUT disabled TIMEOUT enabled What is needed 3 Charger enable/disable Charger disabled Charger enabled The following instruments will be needed to perform testing: 4 IREF setting 1 5 IREF setting 2 Add 125mA ICHG=125mA When both off Add 250mA • ISL6298EVAL2 board • The ISL6298 Data Sheet • Power supplies: 6 IMIN setting 25mA 1 PS1: DC 20V/5A, 7 TEMP normal Normal 2 PS2: DC (sinks current) 20V/5A, such as Agilent 6654A) 8 TEMP high Too hot 9 TEMP low Too cold REMARK 12.5mA All off simulates battery removal • Electronic load: 20V/5A TABLE 2. JUMPER SETTINGS • Multimeters JUMPER • Function generator • Oscilloscope JP1 • Cables and wires JP2 Quick Setup Guide Step 1: Switch on bit 4 and bit 7 of the Dip-switch. Leave all other bits off, (See Figure 1.) 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. ON OFF 3 4 5 6 7 8 9 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. 2 FUNCTION USB input selected WALL CUBE TO Wall adapter input selected VIN Shunt Installed Connect VBAT pin to battery Current meter can replace shunt shunt installed Battery attached to Thermistor at J2 not installed Default IREF and V2P8 Setting USB 255mA mode IREF and GND Setting USB 100mA mode Initial Board Jumper Positioning (Refer to Figure 3) Step 2: 2 JP3 JP4 DO NOT APPLY POWER UNTIL STEP 6 1 POSITION USB TO VIN 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. AN1172.0 February 9, 2005 Application Note 1172 FIGURE 2. CONNECTION OF INSTRUMENTS 3 AN1172.0 February 9, 2005 Board Layout Information Schematics of PCB board 4 Application Note 1172 AN1172.0 February 9, 2005 FIGURE 3. BOARD LAYOUT INFORMATION SCHEMATIC Application Note 1172 TABLE 3. ISL6298EVAL2 BILL OF MATERIALS ITEM QUANTITY REFERENCE 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 ISL6298 Intersil 25 6 VIN, VBAT, TIME, GND1, GND2, GND3 5002K-ND DigiKey 5 PART DESCRIPTION Single-Cell Li-ion Battery Charger Test Point PCB FOOTPRINT 16-pin, 4 x 4 QFN PART NUMBER VENDOR AN1172.0 February 9, 2005 Application Note 1172 PCB Layout 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 6 AN1172.0 February 9, 2005