+Denotes lead-free and RoHS compliant.

Size: px

Start display at page:

Download "+Denotes lead-free and RoHS compliant."

Joanna Tate
6 years ago
Views:

1 9-0; Rev 0; 0/07 MAX866 Evaluation Kit General Description The MAX866 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX866 power-management IC. The MAX866 integrates two synchronous step-down regulators, four low-dropout linear regulators (LDOs), and a linear charger for a single-cell Li-ion (Li+)/Li-polymer battery. Maxim s Smart Power Selector (SPS) safely distributes power between an external power source (AC adapter, auto adapter, or USB source), battery, and the system load. Smart Power Selector is a trademark of Maxim Integrated Products, Inc. DESIGNATION QTY DESCRIPTION C, C4, C6, C0, C 5 0µF ±0%, 6V X5R ceramic capacitors (0805) Taiyo Yuden EMKBJ06KG C 0.µF ±0%, 0V X5R ceramic capacitor (040) Murata GRM55R6A04K TDK C005X5RA04K Taiyo Yuden LMK05BJ04KV C, C7_ 0 Not installed, capacitors (0805) C5_, C5_ 0µF ±0%, 6.V X5R ceramic capacitors (0805) Murata GRM9R60J06K C7_ 47µF ±0%, 6.V X5R ceramic capacitor (0805) Taiyo Yuden JMKBJ476MG C8, C9 µf ±0%, 6V X5R ceramic capacitors (060) Murata GRM88R6C05K Taiyo Yuden EMK07 BJ05KA C 0 Not installed, capacitor (040) C 4.7µF ±0%, 6.V X5R ceramic capacitor (060) Murata GRM88R60J475K Taiyo Yuden JMK07BJ475MA Features Two High-Efficiency MHz Synchronous Rectified Step-Down Regulators Four LDO Regulators with Jumper-Selectable Output Voltages Single-Cell Li+/Li-Polymer Charger Smart Power Selector (SPS) Power-OK, Charger Status, and Timeout Fault Indicators 40-Pin, 5mm x 5mm x 0.8mm Thin QFN Package Fully Assembled and Tested PART MAX866EVKIT+ +Denotes lead-free and RoHS compliant. Ordering Information TYPE EV Kit Component List DESIGNATION QTY DESCRIPTION C4, C6.0µF ±0%, 6.V X5R ceramic capacitors (060) Murata GRM88R60J05K C5.µF ±0%, 6.V X5R ceramic capacitor (060) Murata GRM85R60J5K Taiyo Yuden JMK07BJ5KA C7 0 Not installed, capacitor (0) C8 C9 C0 C C 4.7pF ±0.pF, 50V C0G ceramic capacitor (040) Murata GRM555CH4R7B pf ±5%, 50V C0G ceramic capacitor (040) Murata GRM555CH0J 6800pF ±0%, 50V X7R ceramic capacitor (060) Murata GRM88R7H68K 0,000pF ±0%, 50V X7R ceramic capacitor (060) Murata GRM88R7H0K,000pF ±0%, 50V X7R ceramic capacitor (060) Murata GRM88R7HK Evaluates: MAX866 Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 MAX866 Evaluation Kit Evaluates: MAX866 DESIGNATION QTY DESCRIPTION C D, D JU JU6 6 JU7 JU9 L L P P P4 68,000pF ±0%, 5V X7R ceramic capacitor (060) Murata GRM88R7E68K Green LEDs Agilent HSMG-C50 -pin headers, 6-pin headers, 0.in centers (comes in 6-pin strips, cut to fit) Sullins PTC6SAAN Digi-key S0-6-ND -pin headers, 6-pin headers, 0.in centers (comes in 6-pin strips, cut to fit) Sullins PTC6SAAN Digi-key S0-6-ND.µH inductor TOKO DE88C 07AS-RM,.6A, 50mΩ (.8mm x.0mm x.8mm) 4.7µH inductor TOKO DE88C 07AS-4R7M,.A, 70mΩ (.8mm x.0mm x.8mm).mm/5.5mm closed-frame power jack CUI, Inc. PF-00AH-SMT USB mini AB receptacle connector Cypress Industries CCMUSBAB mm (0.049in) pitch header, surface-mount, right angle, leadfree, 0 circuits Molex Digi-key WM768CT-ND Component List (continued) DESIGNATION QTY DESCRIPTION PSL, PSL x pads (0805) Default PSL-, PSL- 0Ω resistor (0805) R, R4 kω ±% resistors (0805) R 0 Not installed, resistor (06) R 0 Not installed, resistor (060) R5 464kΩ ±% resistor (040) R6, R8 00kΩ ±% resistors (040) R7 60.4kΩ ±% resistor (040) R9.5kΩ ±% resistor (040) R0 0 Not installed, resistor (040) R.4kΩ ±% resistor (0805) R.kΩ ±% resistor (0805) R 8.0kΩ ±% resistor (0805) R4, R5 Bourns 50kΩ 96 trimming potentiometers R6, R8 0 Not installed, resistors (0805) R7 0.0kΩ ±% resistor (0805) R9, R0 560kΩ ±5% resistors (0805) R7 0 Not installed, resistor (06) U MAX866ETL+ (40-pin thin QFN, 5mm x 5mm x 0.8mm) PCB: MAX866EVKIT+ Component Suppliers SUPPLIER PHONE WEBSITE Agilent Technologies CUI, Inc Cypress Industries Molex Murata Taiyo Yuden TDK TOKO Note: Indicate you are using the MAX866 when contacting these manufacturers.

3 MAX866 Evaluation Kit Recommended Equipment Variable 9V power supply One-cell Li+/Li-polymer battery voltmeters ammeter Load resistors or electronic loads capable of.a Quick Start Procedures The MAX866 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation: ) Enable outputs OUT, OUT, OUT4, OUT5, OUT6, and OUT7 by placing shunts across pins - of JU7, JU8, JU0, JU, JU, and JU. See Table. Table shows default EV kit output voltages and maximum currents. ) Set the OUT4, OUT5, OUT6, and OUT7 output voltages by setting shunts JU7 and JU8 as shown in Table. Note that the JU7 and JU8 jumper settings are read only on power-up. Changes to these jumpers after power-up are ignored. ) Place the JU9 shunt across pins - to allow OUT and OUT to enter skip mode at light loads. 4) Place the JU4 and JU5 shunts across pins - and - to set a 500mA USB input current limit. 5) Place the JU6 shunt across pins - to enable the battery charger. 6) Verify that the JU. shunt is installed to set the charge current limit to 0.97A. 7) Verify that the JU.4 shunt is installed to set the 5h fast-charge fault timer limit. 8) Verify that JU5 and JU6 shunts are installed to set the POK LED (D) and the CHG LED (D) on. 9) Place the JU9 shunt across pins -. 0) Preset the power supply to 5V. Turn the power supply off. Caution: Do not turn on the power supply until all connections are completed. ) Make connections to the EV kit as shown in Figure, except do not connect the battery until step 6. ) Turn on the 5V power supply. ) Verify that the POK LED (D) turns on to indicate power-ok. 4) Verify that the voltage across the OUT and PGND pads is.v. 5) Verify that the voltage across the OUT and PGND pads is.v. 6) Verify that OUT4, OUT5, OUT6, and OUT7 are at the voltages set by jumpers JU7 and JU8 (see Table ). 7) Verify that the voltage at the BAT pad is 4.V. 8) Observe correct Li+/Li-polymer cell polarity. Connect a single-cell Li+/Li-polymer battery across the BAT and GND pads. 9) Verify that the CHG LED (D) turns on. The CHG LED turns on during prequalification and fastcharge conditions. The CHG LED turns off when the battery-charging current drops to 7.5% of the fastcharge current, indicating charging is complete. Table. Enable Jumper Functions JUMPER JU7 POSITION - - Enable OUT* Disable OUT Drive EN with an external source. Evaluates: MAX866 DC + POWER SUPPLY - Li+/Li-POLYMER BATTERY A P GND BAT GND MAX866 EV KIT PGND OUT OUT PGND V V JU8 JU0 JU JU Enable OUT* Enable OUT4* Enable OUT5* Enable OUT6* Disable OUT Disable OUT4 Disable OUT5 Disable OUT6 Drive EN with an external source. Drive EN4 with an external source. Drive EN5 with an external source. Drive EN6 with an external source. JU Enable OUT7* Disable OUT7 Drive EN7 with an external source. Figure. Test Procedure Setup (Caution: Do Not Exceed 5.5V at V L ) *Default position.

4 MAX866 Evaluation Kit Evaluates: MAX866 Table. Default EV Kit Output Voltages and Maximum Currents OUTPUT VOLTAGE (V) MAXIMUM CURRENT (ma) OUT. 00 OUT. 900 OUT OUT5. 50 OUT6. 00 OUT7. 50 Table. SL and SL Output Voltage Selection JU7 (SL) JU8 (SL) Table 4. DC Input Current and Charger Current-Limit Select OUT4 (V) OUT5 (V) OUT6 (V) OUT7 (V) Open Open Open Open Open Open CEN PEN PEN DC INPUT CURRENT LIMIT EXPECTED INPUT TYPE CHARGER CURRENT LIMIT mA 00mA USB 556 x (.5V / R ISET ) mA 500mA USB 556 x (.5V / R ISET ) - - X 000 x (.5V / R PSET ) AC adapter 556 x (.5V / R ISET ) - X - Off USB suspend Off mA 500mA USB Off x (.5V / R PSET ) AC adapter Off X = Don t care. R ISET is the resistance between ISET and GND; and R PSET is the resistance between PSET and GND. Detailed Description Smart Power Selector (SPS) SPS seamlessly distributes power between the external input, the battery, and the system load. The basic functions of SPS are: With both the external power supply and battery connected: a) When the system load requirements exceed the capacity of the external power input, the battery supplies supplemental current to the load. b) When the system load requirements are less than the capacity of the external power input, the battery is charged with residual power from the input. When the battery is connected and there is no external power input, the system is powered from the battery. When an external power input is connected and there is no battery, the system is powered from the external power input. DC Input Current-Limit Selection (PEN/PEN) The input current limit can be set to a variety of values as shown in Table 4. When the PEN input is low, a USB source is expected at DC and the current limit is set to either 95mA or 475mA by PEN. When PEN is high, an AC adapter is expected at DC and the current limit is set by a programming resistor at PSET. The DC input current limit is calculated from: I DC_LIM = 000 x (.5V / R PSET ) An exception is when the battery charger is disabled (CEN high) with PEN low, where the MAX866 enters USB suspend mode. Power-OK Output (POK) The POK LED (D) is a visual indicator of power-ok status. When the voltage at DC is between the undervoltage and the overvoltage thresholds, and is greater than the BAT voltage, POK pulls low to indicate that input power is OK. Otherwise, POK is high impedance. POK is not affected by PEN, PEN, or CEN and also remains active in thermal overload. 4

5 MAX866 Evaluation Kit Battery Charger With a valid AC adapter/usb voltage present, the battery charger initiates a charge cycle when the charger is enabled. If the battery voltage is less than the BAT prequalification threshold (V), the charger enters prequalification mode, in which the battery charges at 0% of the maximum set fast-charge current. This slow charge ensures that the battery is not damaged by fast-charge current while deeply discharged. Once the battery voltage rises to.0v, the charger transitions to fast-charge mode and applies the maximum charge current. As charging continues, the battery voltage rises until it reaches the battery regulation voltage (4.V) where charge current starts tapering down. When charge current decreases to 7.5% of fast-charge current, the charger enters top-off mode. Top-off charging continues for 0min, then all charging stops. If the battery voltage subsequently drops below the 4.V recharge threshold, charging restarts and the timers reset. The charger can be enabled or disabled with jumper CEN. Charge Current ISET adjusts the MAX866 charging current to match the capacity of the battery. A resistor from ISET to ground (R0, R, R, R, or R4) sets the maximum fast-charge current, the charge current in prequal, and the charge-current threshold below which the battery is considered completely charged. Calculate these thresholds as follows: I CHG-MAX = 556 x.5v / R ISET I PREQUAL = 0% x I CHG-MAX I TOP-OFF = 7.5% x I CHG-MAX See Table 5 for the charge-current setting and jumper JU configurations. Table 5. Charge-Current Setting JU POSITION CHARGE CURRENT (A) JU. Short 0.97 JU. Short 0.79 JU. Short 0.9 JU.4 Short Adjustable Charge Timer The MAX866 features a fault timer for safe charging. If prequalification charging or fast charging does not complete within the time limits programmed by the timer capacitor at CT (C, C0, C, C, or C), the charger stops charging and the CHG LED (D) blinks at a Hz rate to indicate the fault. Charging can be resumed by either toggling CEN or cycling the DC input voltage. The MAX866 supports values of C CT from 0.0µF to µf: tprequal = 0min CCT μF ffst CHG = 00min CCT μF When the charger exits fast-charge mode, CHG goes high impedance and top-off mode is entered. Top-off time is also determined by C CT : ttop OFF = 0min CCT μF See Table 6 for the charge-timer setting and jumper JU configurations. Table 6. Charge-Timer Setting JU POSITION PREQUALIFICATION CHARGE TIMER (min) FAST-CHARGE TIMER (min) JU. Short.0 0 JU. Short JU. Short JU.4 Short Charge Status Output (CHG) The CHG LED (D) indicates charge status. The LED is on (CHG low) when the charger is in the prequalification or fast-charge mode. It is off (CHG high impedance) when the charger is disabled in top-off mode or in done mode. The charger enters fault status when the charge timer expires before the charging completes. In this state, the CHG LED pulses at Hz to indicate that a fault occurred. Battery Charger Thermistor Input (THM) Battery or ambient temperature can be monitored with a negative temperature coefficient (NTC) thermistor connected from the THM pad to GND. Charging is then allowed when the thermistor temperature is within the allowable range. The charger enters a temperature suspend state when the thermistor resistance falls below.97kω (too hot, over +50 C) or rises above 8.7kΩ Evaluates: MAX866 5

6 MAX866 Evaluation Kit Evaluates: MAX866 (too cold, below 0 C). Adjust potentiometer R5 to simulate the temperature change and verify the THM function. R6, R7, and R8 are available for further THM evaluation. Regulator Outputs (OUT, OUT, OUT4 OUT7) The MAX866 EV kit has six power-supply outputs: two step-down converters (OUT and OUT), and four LDO regulators (OUT4 OUT7). Refer to the MAX866/MAX866 data sheet for more information on these regulators. Each regulator output is individually enabled or disabled with jumpers JU7, JU8, JU0 JU, respectively (see Table ). The OUT/OUT voltages can be set between 0.98V and V DC by connecting FB/FB to the center of a resistive voltage-divider between OUT/OUT and GND. Refer to the Setting OUT and OUT Output Voltage section of the MAX866/MAX866 data sheet. The output voltages for OUT4 OUT7 are set by jumpers JU7 and JU8. See Table and refer to the Linear Regulators (OUT4, OUT5, OUT6, and OUT7) section of the MAX866/MAX866 data sheet. 6

7 Evaluates: MAX866 MAX866 Evaluation Kit 7, C9.0μF PSL 0Ω OUT OUT JU7 PSL 0Ω OUT OUT R8 00kΩ % C9 pf C7_ R7 60.4kΩ % OUT OUT L 4.7μH C7_ 47μF C6 0μF JU8 EN JU9 PWM R6 00kΩ % R5 464kΩ % C5_ 0μF C8 4.7pF C5_ 0μF L.μH OUT OUT JU7 EN C4 0μF R0 560kΩ D R4 kω % JU6 CHG JU9 VLOGIC OUT R9 560kΩ JU5 R kω % D POK T C 0.μF C 0μF R C R USB_IN SELECT JU T5 P P- P- P- P-4 P-5 T T T4 P P DC, DC GND VL POK CHG PV EN LX PG FB PWM PV EN LX PG FB IN45 SL SL IN67 EN7 EN6 EN5 EN4 OUT7 OUT6 OUT5 OUT4 PSET C6.0μF C5.μF C4.0μF C 4.7μF OUT4 OUT5 OUT6 OUT7 R9.5kΩ % EN7 EN6 EN5 EN4 JU0 JU JU JU EXPOSED PAD R0 R.4kΩ % R.kΩ % R 8.0kΩ % 4 JU R4 50kΩ POT CW ISET 4 C0 6800pF C 0,000pF C,000pF C 68,000pF C JU JU4 JU5 JU6 PEN PEN CEN R6 SHORT R7 0kΩ % R8 JU4 4 R5 50kΩ POT CW THM 5, 6 C0 0μF C7 7, 8 C 0μF R7 SHORT BAT P4 P4-0 P4-9 P4-8 P4-7 P4-6 P4-5 P4-4 P4- P4- P4-0 CT CEN PEN PEN THM BAT, BAT, MAX866 U VL 8 9 C8.0μF JU8 GND Figure. MAX866 EV Kit Schematic

8 MAX866 Evaluation Kit Evaluates: MAX866 Figure. MAX866 EV Kit Component Placement Guide Component Side 8

9 MAX866 Evaluation Kit Evaluates: MAX866 Figure 4. MAX866 EV Kit PCB Layout Top Layer 9

10 MAX866 Evaluation Kit Evaluates: MAX866 Figure 5. MAX866 EV Kit PCB Layout Logic Signal Layer 0

11 MAX866 Evaluation Kit Evaluates: MAX866 Figure 6. MAX866 EV Kit PCB Layout Power Layer

12 MAX866 Evaluation Kit Evaluates: MAX866 Figure 7. MAX866 EV Kit PCB Layout GND Layer 4 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 0 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

+Denotes lead(pb)-free and RoHS compliant

+Denotes lead(pb)-free and RoHS compliant 9-44; Rev ; 0/0 MAX890A Evaluation Kit General Description The MAX890A evaluation kit (EV kit) is a fully assembled and tested circuit board for evaluating the A, -cell Li+ DC-DC battery charger. The EV