ISL6252AEVAL1Z Evaluation Board Setup Procedure ® Application Note October 25, 2007 AN1361.0 Low Cost Multi-Chemistry Battery Charger Controller Features The ISL6252, ISL6252A is a highly integrated battery charger controller for Li-ion/Li-ion polymer batteries and NiMH batteries. High Efficiency is achieved by a synchronous buck topology and the use of a MOSFET, instead of a diode, for selecting power from the adapter or battery. The low side MOSFET emulates a diode at light loads to improve the light load efficiency and prevent system bus boosting. • ±3% Accurate Input Current Limit • ±0.5% Charge Voltage Accuracy (-10°C to +100°C) The constant output voltage can be selected for 2-, 3- and 4series Li-ion cells with 0.5% accuracy over-temperature. It can be also programmed between 4.2V +5%/cell and 4.2V -5%/cell to optimize battery capacity. When supplying the load and battery charger simultaneously, the input current limit for the AC adapter is programmable to within 3% accuracy to avoid overloading the AC adapter, and to allow the system to make efficient use of available adapter power for charging. It also has a wide range of programmable charging current. The ISL6252, ISL6252A provides outputs that are used to monitor the current drawn from the AC adapter, and monitor for the presence of an AC adapter. The ISL6252, ISL6252A automatically transitions from regulating current mode to regulating voltage mode. Ordering Information PART NUMBER (Note) ISL6252HRZ* ISL6252AHRZ* ISL6252 AHRZ • ±25% Accurate Battery Trickle Charge Current Limit (ISL6252A) • Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage • Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load • Output for Current Drawn from AC Adapter • AC Adapter Present Indicator • Fast Input Current Limit Response • Input Voltage Range 7V to 25V • Support 2-, 3- and 4-Cell Battery Pack • Up to 17.64V Battery-Voltage Set Point • Thermal Shutdown • Support Pulse Charging • Less than 10µA Battery Leakage Current • Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc. • Pb-Free (RoHS Compliant) Applications TEMP RANGE (°C) PART MARKING ISL 6252HRZ • ±3% Accurate Battery Charge Current Limit PACKAGE (Pb-Free) PKG. DWG. # -10 to +100 28 Ld 5x5 QFN L28.5×5 • Notebook, Desknote and Sub-notebook Computers • Personal Digital Assistant) Pinout -10 to +100 28 Ld 5x5 QFN L28.5×5 ISL6252, ISL6252A (28 LD QFN) TOP VIEW) 1 ACSET VDD DCIN NA ACPRN CSON 28 27 26 25 24 23 22 20 CSIN ICOMP 3 19 CSIP VCOMP 4 18 NA ICM 5 17 NA VREF 6 16 PHASE CHLIM 7 15 UGATE 8 9 10 11 12 13 14 BOOT 2 VDDP CELLS LGATE CSOP PGND 21 GND 1 VADJ EN ACLIM NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and 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-020. NA *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1361 What’s Inside Step 3: Select the Battery Charger Current Limit (Table 3) This Evaluation Board Kit contains the following materials: • Qty(1) ISL625xEVAL1Z Evaluation Board • Qty(1) ISL6252EVAL1Z Setup Procedure What is Needed The following materials are recommended to perform testing: • One adjustable 25V 6A power supply • Two adjustable electronic loads with constant current mode and constant voltage mode 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 100% CURRENT CHLIM PIN SHUNT FEEDBACK JUMPER CONNECTED CSOP TO CSON TO: LOCATION • Two DVMs • One 500MHz four channel oscilloscope • Four passive oscilloscope voltage probes • Two 10ADC Current Probes 100% CONSTANT CURRENT 1-3 VREF 120mV 4.80A Removed Floating 0V 0A • One signal generator 3-5 GND 0V 0A Jumper Selection Guide 3-4 R22 or R6/R7 0mV to 120mV 0A to 4.8A Step 1: Select the Number of Cells (Table 1) Step 4: Select the AC Adapter Current Limit (Table 4) 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. 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 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 4. JUMPER JP5 FUNCTIONS SHUNT JUMPER LOCATION ACLIM PIN CONNECTED TO: 100% CURRENT FEEDBACK CSIP TO CSIN 100% ADAPTER CURRENT 1-3 VREF 100mV 5.15A Removed Floating 75mV 3.90A 3-5 GND 50mV 2.65A 3-4 R23 or R17/R18 50mV to 100mV 2.65A to 5.15A Interface Connections TABLE 5. HEADER H1 Input Power TABLE 2. JUMPER JP6 FUNCTIONS PIN# 1 2 CONNECT TO “+” INPUT POWER “+” SENSE (if used) 3 “-” SENSE (if used) 4 “-” INPUT POWER 1 “+” SYSTEM LOAD OUTPUT 2 “+” SENSE (if used) SHUNT JUMPER LOCATION VADJ PIN BATTERY VOLTAGE CHANGE PER CELL 1-3 To VREF +5% 3 “-” SENSE (if used) 4 “-” SYSTEM LOAD OUTPUT 1 “+” BATTERY CHARGER OUTPUT 2 “+” SENSE (if used) 3 “-” SENSE (if used) 4 “-” BATTERY CHARGER OUTPUT 3-5 To GND -5% 5-6 Floating None 3-4 R24 Wiper or R19/R21 Adjustable between -5% to +5% 2 H2 System Load Output H3 Battery Charger Output AN1361.0 October 25, 2007 ISL6252AEVAL1Z Schematic AC ADAPTER C16 NOT POPULATED 18 C12 H2 0.1UF 1 2 3 4 1X4 NOT POPULATED 2 C10 ACSET 0.1UF JP17 1 2 TP27 TP26 1 0 R26 2 R11 10.2K DCSET R10 JP12 Q5 NOT POPULATED R13 1 2 1 10.5K 0.020 JP13 12 NDS352AP 3 R8 TP15 130K R9 TP12 0.1UF 1 2 3 4 1X4 100K C11 H1 SYSTEM R2 D1 DCIN TP25 JP7 JP14 1 2 R27 C3 JP15 1 2 0 VDD C8 IRF7811AV 5 6 7 8 JP9 1 2 LGATE CHLIM_ADJ R6 DNP JP4 1 2 34 56 TP7 R22 20K JP5 1 2 34 56 R17 ACLIM_ADJ 10K R29 NOT POPULATED R30 TP14 NOT POPULATED TP23 NOT POPULATED R24 50K R7 TP20 R20 33.2K R12 L1OUT R23 20K BATTERY H3 0.1UF C14 NOT POPULATED R28 22UF C13 0.01UF 51 C15 22UF R1 0.025 C1 R25 Q2 L1 15UH 0 1 NOT POPULATED TP8 NOT POPULATED R21 JP6 1 2 34 56 R19 TP5 VADJ_ADJ TP21 4 3 2 1 TP24 TP19 VADJ_LIM 2.2 CSIN BGATE 1 10UF JP10 1 2 FDS6612A C9 0 P4 R18 2 TP11 UGATE NOT POPULATED ACLIM TP18 4.7 VADJ TP17 R15 CHLIM TP10 VDDP 1 VREF 1 2 2 JP11 PHASE 15 BOOT 3 D2 CELLS TP4 16 R16 2.2UF 1 17 BAT54WT1 C2 TP1 4 3 2 1 UGATE 1 2 2 JP8 5 6 1 7 8 CHLIM EP JP1 TP2 18 BOOT_CUR 0.1UF PHASE 1 19 8 9 10 11 12 13 14 29 ISL6252AHRZ 20 SGATE BGATE VREF Q1 21 NOT POPULATED 0.01UF 7 U1 VCOMP ICM 10K C7 100PF R14 C6 C5 6800PF 100K R3 TP16 VCOMP EN 6 CSIN CSIP ACLIM VADJ GND PGND LGATE VDDP BOOT 4 5 JP3 12 DCSET ACSET VDD DCIN DCPRN ACPRN CSON 28 27 26 25 24 23 22 SGATE CSIP CSOP 100K EN ICM 3 CSOP TP29 TP28 1 2 3 4 1X4 Application Note 1361 ICOMP TP13 EN CELLS ICOMP Q4 2 C4 1UF 8 7 6 5 1 TP9 SI4835BDY TP6 JP16 1 2 1 2 3 4 DCPRN H4 1 2 3 1X3 1 2 2 0.1UF TP3 1 2 3 4 1X4 1 ACPRN 100K 3 R4 DCIN PULLUP JP2 12 R5 TP22 AN1361.0 October 25, 2007 Application Note 1361 TABLE 6. 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 D2 SURFACE MOUNT SCHOTTKY BARRIER DIODE Diodes Inc. BAT54WT1 1 L1 CHOKE, SMD, 8MM, 4.6µH, 9.1A, SHIELDED Sumida CDRH127/LD-4R6NC 1 U1 IC, Battery Charger, 28P, QFN, -10°C to +100°C Intersil ISL6252HR 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 D1 POWER SCOTTKY DIODE, 10A, 40V Diodes Inc. PDS1040 1 D2 SURFACE MOUNT SCHOTTKY BARRIER DIODE Diodes Inc. BAT54WT1 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 AN1361.0 October 25, 2007 5 Application Note 1361 FIGURE 1. TOP SILK AN1361.0 October 25, 2007 6 Application Note 1361 FIGURE 2. TOP LAYER AN1361.0 October 25, 2007 7 Application Note 1361 FIGURE 3. LAYER 2 GROUND (TOP VIEW) AN1361.0 October 25, 2007 8 Application Note 1361 FIGURE 4. LAYER 3 SIGNAL (TOP VIEW) AN1361.0 October 25, 2007 9 Application Note 1361 AN1361.0 October 25, 2007 FIGURE 5. LAYER 4 GROUND (TOP VIEW) 10 Application Note 1361 FIGURE 6. LAYER 5 GND (TOP VIEW) AN1361.0 October 25, 2007 11 Application Note 1361 FIGURE 7. BOTTOM COPPER (BOTTOM VIEW) AN1361.0 October 25, 2007 12 Application Note 1361 FIGURE 8. BOTTOM SILK (BOTTOM VIEW) AN1361.0 October 25, 2007 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