ISL6253EVAL1B Evaluation Board Setup Procedure ® May 2004 Application Note AN1061.1 General Description Features The ISL6253EVAL1B EV kit includes all the circuitry needed to demonstrate the capabilities of the ISL6253 Lithium-Ion battery-charger with integrated AC adapter current limit. The user can experiment with an extensive matrix of battery charge parameters, AC adapter current limit, monitor functions, and load switching. • ±0.5% Voltage Accuracy from -10°C to +100°C The ISL6253 charger IC controls a high efficiency 300kHz fixed-frequency DC/DC synchronous-rectifier buck-converter. The battery charger employs a current-limited voltageclamped regime while simultaneously protecting the system AC adapter power source from an overcurrent event. If the AC adapter output approaches the user selectable current limit, the battery charger output will automatically foldback to the extent that the AC adapter output current remains compliant. Once the demand on the AC adapter subsides, the battery charger output will resume normal operation. • Trickle Charge Mode 10% of Battery Charger Current Limit when Battery Voltage is Less than 3.0V per Cell • AC Adapter Present Indicator • DC Adapter Present Indicator • Controls P-CH MOSFET Power Source Isolation Switch • Controls P-CH MOSFET Battery Isolation Switch • Pb-free Available Pinout ACSET VDD DCIN DCPRN ACPRN CSON ISL6253HRZ (28 LD 5X5 QFN) TOP VIEW 28 27 26 25 24 23 22 EN 1 21 CSOP CELLS 2 20 CSIN ICOMP 3 19 CSIP VCOMP 4 18 SGATE ICM 5 17 BGATE VREF 6 16 PHASE CHLIM 7 15 UGATE L28.5x5 NOTE: 8 9 10 11 12 13 14 BOOT 28 Ld 5x5 QFN (Pb-free) PKG. DWG. # • AC Adapter Output Current Monitor VDDP -10 to 100 PACKAGE • 150°C Thermal Shutdown Protection LGATE ISL6253HRZ (Note 1) TEMP. RANGE (°C) • Efficient Light Load Diode Emulation Mode PGND PART # • High Efficiency 300kHz Synchronous Buck Rectifier GND Ordering Information • Input Voltage Range 7V to 25V VADJ The ISL6253 has two general purpose 1.26V voltage comparator inputs DCSET and ACSET, that control open drain outputs DCPRN and ACPRN. The ICM pin provides a 0V to 2V output signal that is proportional to the AC adapter output current. • Selectable 2, 3, or 4 Series Cell Battery Packs DCSET The ISL6253 is capable of controlling two P-CH MOSFET isolation switches SGATE and BGATE, that replace diodes typically used for this purpose. The SGATE pin controls a switch that prevents the battery from back-feeding into the system input power source as is possible when an AC adapter remains connected to the system while de-energized. The BGATE pin controls a switch that provides a low impedance discharge path between the battery and the system power bus when the AC adapter is unavailable; otherwise the switch is open, isolating the battery from the input power source. • ±4% Battery Charger Current Limit Accuracy ACLIM The AC Adapter current limit (ACLIM), battery charger current limit (CHLIM), and output voltage limit (VADJ) are programmed by applying the appropriate voltage relative to the GND pin. Each of these three parameters may be independently programmed by connecting to one of the three built-in settings. The three built-in settings are chosen by connecting ACLIM, CHLIM, and VADJ to either VREF, GND, or floating. • ±3% AC Adapter Current Limit Accuracy 1. Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B. 2. Add “-T” for Tape and Reel. 1 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1061 What’s Inside This Evaluation Board Kit contains the following materials: • Qty(1) ISL6253EVAL1B Evaluation Board • Qty(1) ISL6253EVAL1B Setup Procedure What is Needed The following materials are recommended to perform testing: • One adjustable 25V 6A power supply Step 3: Select the Battery Charger Current Limit (Table 3) The CHLIM pin chooses the desired battery charger current limit threshold. Preset battery charger current limit thresholds are selected by placing a shunt jumper across the appropriate pins of JP4. For other battery charger current limit thresholds install a shunt jumper across pins 3 and 4 which connects the wiper of potentiometer R22 to CHLIM. Potentiometer R22 may be removed and replaced with resistors R6 and R7. TABLE 3. JUMPER JP4 FUNCTIONS • Two adjustable 6A constant current electronic loads • Two DVMs • Four passive oscilloscope voltage probes • Two 10ADC Current Probes • One Signal generator Jumper Selection Guide Step 1: Select the Number of Cells (Table 1) The CELLS pin chooses the correct output voltage clamp for a given number of cells series-connected in the battery pack. Select the output voltage by placing a shunt jumper across the appropriate pins of JP1. TABLE 1. JUMPER JP1 FUNCTIONS SHUNT JUMPER LOCATION CELLS PIN CONNECTED TO: NUMBER OF CELLS CONNECTED IN SERIES 100% CONSTANT OUTPUT VOLTAGE 1-2 VDD 4 16.8 2-3 GND 3 12.6 Removed Floating 2 8.4 Step 2: Select the Cell Trim Voltage (Table 2) The VADJ pin trims the battery charger output voltage limit. Preset battery charger output voltage limits are selected by placing a shunt jumper across the appropriate pins of JP6. For other battery charger output voltage limits install a shunt jumper across pins 3 and 4 which connects the wiper of potentiometer R24 to VADJ. Potentiometer R24 may be removed and replaced with resistors R19 and R21. Resistor R20 limits the trim increase to 1%. Shorting R20 allows the trim to increase 5%. Decreasing trim range is unaffected. TABLE 2. JUMPER JP6 FUNCTIONS SHUNT LOCATION VADJ PIN BATTERY VOLTAGE CHANGE PER CELL 1 to 3 Through R20 to VREF +1% 3 to 5 To GND -5% 5 to 6 Floating None 3 to 4 Through R20 To R24 Wiper Adjustable between or R19/R21 5% to +1% 2 100% CONSTANT CURRENT 100% CURRENT CHLIM PIN SHUNT FEEDBACK JUMPER CONNECTED CSOP TO CSON TO: LOCATION • One 500MHz four channel oscilloscope Removed 3.3V@TP10 127mV 5.08A 1-3 VREF 100mV 4.00A Removed Floating 65mV 2.60A 3-5 GND 30mV 1.20A 3-4 R22 or R6/R7 30mV to 127mV 1.20A to 5.08A Step 4: Select the AC Adapter Current Limit (Table 4) The ACLIM pin chooses the desired AC adapter current limit threshold. Preset AC adapter current limit thresholds are selected by placing a shunt jumper across the appropriate pins of JP5. For other AC adapter current limit thresholds install a shunt jumper across pins 3 and 4 which connects the wiper of potentiometer R23 to ACLIM. Potentiometer R23 may be removed and replaced with resistors R17 and R18. TABLE 4. JUMPER JP5 FUNCTIONS SHUNT JUMPER LOCATION ACLIM PIN CONNECTED TO: 100% CURRENT FEEDBACK CSIP TO CSIN 100% ADAPTER CURRENT 1-3 VREF 103mV 5.15A Removed Floating 78mV 3.90A 3-5 GND 53mV 2.65A 3-4 R23 or R17/R18 53mV to 103mV 2.65A to 5.15A Interface Connections The input power source connects to header H1. Positive input power “+” connects to H1 pin 1, “+” SNS (if used) connects to H1 pin 2, “-” SNS (if used) connects to H1 pin 3, and “-” input power connects to H1 pin 4. The battery charger output connects to header H3. Positive battery charger output “+” connects to H3 pin 1, “+” SNS (if used) connects to H3 pin 2, “-” SNS (if used) connects to H3 pin 3, and “-” battery charger output connects to H3 pin 4. The system output connects to header H2. Positive system output “+” connects to H2 pin 1, “+” SNS (if used) connects to H2 pin 2, “-” SNS (if used) connects to H2 pin 3, and “-” system output connects to H2 pin 4. 3 Application Note 1061 FIGURE 1. SCHEMATIC Application Note 1061 TABLE 5. BILL OF MATERIALS QTY REF DES 1 C6 1 DESCRIPTION MFG NAME PART NUMBER Capacitor, SMD, 0603, 100pF, 50V, 5%, COG TDK C1608COG1H101J C7 Capacitor, SMD, 0805, 0.01µF, 50V, 5%, COG TDK C2012COG1H103J 1 C5 Capacitor, SMD, 0805, 6800pF, 50V, 5%, COG TDK C2012COG1H682J 3 C2, C4, C8 Capacitor, SMD, 0805, 1.0µF, 16V, 20%, X7R TDK C2012X7R1C105M 3 C3, C9, C10 Capacitor, SMD, 0805, 0.1µF, 50V, 10%, X7R TDK C2012X7R1H104K 2 C14, C15 Capacitor, SMD, 1812, 22µF, 25V, 20%, X5R TDK C4532X5R1E226M 1 L1 Choke, SMD, 8mm, 15µH, 20%, 5.65A, Shielded Sumida CDRH127/LD-150NC 1 U1 IC, Battery Charger, 28P, QFN, -10°C to +100°C Intersil ISL6253HR 1 Q2 MOSFET, N-CH, 8P, SOIC, 30V, 8.4A, 0.022Ω Fairchild FDS6612A 1 Q1 MOSFET, N-CH, 8P, SOIC, 30V, 10.8A, 0.011Ω IR IRF7811AV 1 Q5 MOSFET, P-CH, 3P, SOT23, -30V, -0.9A, 0.5Ω Fairchild NDS352AP 2 Q3, Q4 MOSFET, P-CH, 8P, SOIC, -30V, -17A, 0.0075Ω Siliconix SI4405DY 1 R2 Resistor, Shunt, SMD, 2010, 0.020Ω, 1W, 1% IRC LRC-LRF2010-01-R020-F 1 R1 Resistor, Shunt, SMD, 2010, 0.025Ω, 1W, 1% IRC LRC-LRF2010-01-R025-F 1 R13 Resistor, SMD, 0805, 18Ω, 0.125W, 5% KOA RK73B2AT180J 1 R12 Resistor, SMD, 0805, 2.2Ω, 0.125W, 5% KOA RK73B2AT2R2J 1 R15 Resistor, SMD, 0805, 4.7Ω, 0.125W, 5% KOA RK73B2AT4R7J 1 R14 Resistor, SMD, 0805, 10kΩ, 0.125W, 1% KOA RK73H2AT1002F 1 R11 Resistor, SMD, 0805, 7.87kΩ, 0.125W, 1% KOA RK73H2AT7871F 3 R3, R4, R8 Resistor, SMD, 0805, 100kΩ, 0.125W, 1% KOA RK73H2AT1003F 1 R20 Resistor, SMD, 0805, 33.2kΩ, 0.125W, 1% KOA RK73H2AT3322F 2 R10, R16 Resistor, SMD, 0805, 0Ω, 2A, 50mΩ Max KOA RK73Z2AT 4 4 1 1 4 1 4 1 FIGURE 2. TOP SILK AND ASSEMBLY 4 Application Note 1061 2 4 6 2 4 6 1 3 5 1 3 5 5 2 4 6 1 3 5 3 2 1 6 Application Note 1061 FIGURE 3. BOTTOM SILK AND ASSEMBLY 7 Application Note 1061 FIGURE 4. TOP 8 Application Note 1061 FIGURE 5. L2 GND 9 Application Note 1061 FIGURE 6. L3 SIGNAL 10 Application Note 1061 FIGURE 7. L4 GND 11 Application Note 1061 FIGURE 8. L5 GND 12 Application Note 1061 FIGURE 9. BOTTOM 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