Evaluates: MAX8845Z/MAX8845Y 19-4405 Rev 0 12/08 MAX8845Z Evaluation Kit General Description Features The MAX8845Z evaluation kit (EV kit) is a fully assem- CCCV, Thermally Regulated Linear Single-Cell Li+ bled and tested PCB for evaluating the MAX8845Z/ Battery Charger MAX8845Y 28V linear Li+ battery chargers. No External MOSFET, Reverse-Blocking Diode, or The MAX8845Z EV kit features an overvoltage-protect- Current-Sense Resistor ed LDO output (SAFEOUT) for low-voltage-rated USB or charger inputs in the system, and a battery pack Programmable Fast-Charge Currents (1A max) RMS detection circuit (DETBAT) that disables the IC when Programmable Top-Off Current Threshold the battery pack is absent. The IC disables charging if the input sources exceed 7.5V to protect against Input Overvoltage-Protected 4.7V Output unqualified or faulty AC adapters. The MAX8845Z EV kit (SAFEOUT) from DC also features an adjustable fast-charge current set by Proprietary Die Temperature Regulation Control an external resistor (R1) and an adjustable top-off cur- (+115C) rent threshold set by an external resistor (R2). 4.25V to 28V Input-Voltage Range with Input Other features include an active-low control input (EN) Overvoltage Protection Above +7.5V and an active-low input power source detection output (POK). The IC also contains a booting assistant circuit Low-Dropout Voltage (300mV at 500mA) that distinguishes input sources and battery connec- Input Power-Source Detection Output (POK), tion, and provides an output signal (MAX8845Z = ABO, Charge Status Output (CHG), and Charge-Enable MAX8845Y = ABO) for system booting. Input (EN) To evaluate the MAX8845Y version, order the MAX8845YETC+ along with the MAX8845ZEVKIT+ and Output for Autobooting (MAX8845Z = ABO, see the Evaluating the MAX8845Y section. MAX8845Y = ABO) Lead(Pb)-Free and RoHS Compliant Ordering Information PART TYPE MAX8845ZEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1F 10%, 35V X5R ceramic 1F 10%, 10V X5R ceramic C1 1 capacitor (0603) C4 1 capacitor (0402) Taiyo Yuden GMK107BJ105KA Murata GRM155R61A105K C5 0 Not installed, capacitor 2.2F 10%, 10V X5R ceramic capacitor (0603) Red LEDs C2 1 D1, D2 2 Taiyo Yuden LMK107BJ225KA Panasonic LNJ208R8ARA Murata GRM188R61A225KE34 2-pin headers, 0.1in center JU1JU4 4 Sullins PEC36SAAN 0.1F 10%, 16V X7R ceramic Digi-Key S1012E-36-ND C3 1 capacitor (0402) TDK C1005X7R1C683K R1 1 2.80k 1% resistor (0402) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX8845Z Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION R2 1 1.74k 1% resistor (0402) 28V linear Li+ battery charger R3, R4 2 200 5% resistors (0402) (12 Thin QFN-EP*) U1 1 Maxim MAX8845ZETC+ R5 1 4.7k 5% resistor (0402) (Top Mark: ABL) Not installed, resistorsPCB short R6, R7 0 1 PCB: MAX8845Z Evaluation Kit+ (0402) R8 1 200k 5% resistor (0402) *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Digi-Key Corp. 800-344-4539 www.digikey.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Sullins Electronics Corp. 760-744-0125 www.sullinselectronics.com Taiyo Yuden 800-348-2496 www.t-yuden.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX8845Z when contacting these component suppliers. 4) Verify that a shunt is installed on JU2 (DETBAT). Quick Start 5) Verify that JU3 and JU4 are open and shunts are Recommended Equipment not installed. 4V to 28V adjustable power supply (PS1) capable of 1A 6) Connect the positive lead of the power supply (PS1) One 5V power supply (PS2) capable of 100mA to the EV kit pad labeled IN. Connect the negative Three digital multimeters (DMM1, DMM2, DMM3) lead of the power supply to the EV kit pad labeled GND. One 10A ammeter 7) Connect the positive lead of the power supply (PS2) One single-cell lithium-ion (Li+) battery (not fully to the EV kit pad labeled VI/O. Connect the negative charged) lead of the power supply to the EV kit pad labeled Procedure GND. The MAX8845Z EV kit is a fully assembled and tested 8) Observe correct Li+ cell polarity. Connect the sin- surface-mount board. Follow the steps below and gle-cell Li+ battery and 10A ammeter, as shown in Figure 1 to set up and verify the MAX8845Z and board Figure 1. The positive lead of the ammeter must operation: connect to BATT+ and the negative lead to the pos- 1) Preset the power supply (PS1) to 5V. Turn off the itive terminal of the Li+ battery. power supply. Do not turn on the power supply 9) Connect a digital multimeter (DMM1) across the Li+ until all connections are completed. battery. Connect the positive lead of DMM1 to the 2) Preset the power supply (PS2) to 5V. Turn off the positive terminal of the Li+ battery. Connect the power supply. Do not turn on the power supply negative lead of DMM1 to the negative terminal of until all connections are completed. the Li+ battery and note the battery voltage. If V < 2.5V, the charger starts in precharge BATT 3) Verify that a shunt is installed on JU1 (EN) to set the mode. If V 2.5V, the charger starts up in fast- BATT EV kit in disable mode. charge mode. 2 Evaluates: MAX8845Z/MAX8845Y