MAX1873 Evaluation MAX1873 evaluation kit) complete, fully assemb

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MAX1873 Evaluation MAX1873 evaluation kit) complete, fully assemb

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19-2096; 7/01
MAX1873 Evaluation
MAX1873 evaluation kit) complete, fully assembled tested board that capable supplying power system load while charging lithiumion (Li+) nickel (Ni)-based battery pack. preset limit total source current maximum battery-charging current charge 4-series cells 4.2V each. analog output voltage proportional charging current also permits microcontroller monitor charging current. requires power source with minimum output 18.5V. reconfigured limit total input current drawn from power source, maximum battery-charging current, charging cell voltage. cell voltage between 4.009V 4.387V using standard resistors. charge battery packs with three cells, replace board with listed Parts Selection Table. Input-Current Source Limiting Charges Lithium-Ion Batteries Also Charges Ni-Based Batteries Input 300kHz Operation 16-Pin QSOP Package Surface-Mount Construction Fully Assembled Tested
Features
Evaluates: MAX1873
Ordering Information
PART MAX1873EVKIT TEMP. RANGE +70°C PACKAGE QSOP
Component Suppliers
SUPPLIER Fairchild Murata Sumida Taiyo Yuden PHONE 843-448-9411 888-522-5372 361-992-7900 770-436-1300 847-545-6700 800-348-2496 847-803-6100 843-448-1943 972-910-8036 361-992-3377 770-436-3030 847-545-6720 847-925-0899 847-390-6296
Part Selection Table
PART MAX1873REEE MAX1873SEEE MAX1873TEEE LITHIUM-ION CELLS CELLS CHARGE CHARGE INPUT VOLTAGE RANGE 9.5V 14.0V 18.5V
Note: Please indicate using MAX1873 when contacting these manufacturers.
Component List
DESIGNATION DESCRIPTION 2.2µF ±20%, ceramic capacitor (0805) Taiyo Yuden LMK212BJ225MG C2012X5R1A225KT 0.22µF ±10%, ceramic capacitors (0805) Taiyo Yuden GMK212BJ224KG C2012X7R1H224KT 0.047µF ±10%, ceramic capacitors (0805) Taiyo Yuden UMK212BJ473KG DESIGNATION DESCRIPTION 0.1µF, 50V, ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG C2012X7R1H104KT 22µF ±10%, low-ESR tantalum capacitors TPSE226K035R0200 68µF ±20%, low-ESR tantalum capacitor TPSE686M025R0125 installed, capacitors
C14,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1873 Evaluation Evaluates: MAX1873
Component List (continued)
DESIGNATION DESCRIPTION 1000pF ±10%, ceramic capacitor (0603) C1608X7R1H102KT Murata GRM188R71H102KA01 ±10%, 10V, ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG C2012X7R1A105KT Schottky diodes (SMC) Fairchild MBRS340 10µH, inductor Sumida CDH115-100 30V, 7.9A, P-channel MOSFET (SO-8) Fairchild NDS8435A DESIGNATION R10, None None None None DESCRIPTION 0.033 ±1%, resistor (2010) LRC-LR2010-01-R033-F 0.068 ±1%, resistor (2010) LRC-LR2010-01-R068-F 100k resistors (0805) resistors (0805) resistors (0603) installed, resistors (0805) MAX1873TEEE (16-PIN QSOP) 2-pin header Shunt MAX1873 board MAX1873 data sheet MAX1873 data sheet
Quick Start
MAX1873 fully assembled tested surface-mount board. Follow steps below verify board operation. turn power supply until connections completed confirm that battery 4-cell in-series battery. Verify that shunt across jumper (EN). Shunting ground disables charger. Place voltmeter across BATT+ terminals kit. Place voltmeter across IOUT AGND terminals kit. Connect 28V, power supply across GND. Turn power supply. Verify that no-load voltage across BATT+ approximately 16.8V. Observe correct cell polarity. Connect four battery cells series) across BATT+ terminals Kit. Monitor BATT+ voltage until reaches 16.8V ±0.75%.
battery pack without exceeding adapter current limits. Charging achieved with external P-channel MOSFET operated step-down DC-DC configuration. analog output voltage proportional charging current available IOUT that microcontroller also monitor charging current. configured 4-cell charging, requires power source that supply voltage 18.5V current preset limit total source current maximum charging current charge 4series cells 4.2V cell. user reset these current limits replacing current-sense resistors board adjusting input voltage ICHG/EN with external voltage supply ICHG/EN pad. cell-charging voltage between 4.009V 4.387V using standard resistors. user easily reconfigure board provide regulated current charge 10-cell Ni-based battery packs. charge Ni-based battery packs with different number cells, replace board with listed Parts Selection Table.
Input Source
MAX1873 requires power supply that source peak system current load greater than with voltage range 18.5V 28V. This voltage range required MAX1873EEET, which comes installed board. minimum input
Detailed Description
MAX1873 supply power system load while charging lithium-ion (Li+) nickel (Ni)-based
MAX1873 Evaluation Evaluates: MAX1873
voltage decreased MAX1873TEEE replaced with MAX1873REEE MAX1873SEEE. Refer Parts Selection Table beginning this document their respective input voltage ranges. Note: system load greater than verify that input source rated accordingly replace with higher-current-rated diode.
Control Input/Output
MAX1873 features output (IOUT) input (ICHG/EN) board pads that allow user monitor battery-charging current, well enable disable charger. IOUT board analog output voltage supply that proportional charging current. voltage IOUT 4.0V (±0.4V) during maximum charge current. microcontroller detect this voltage. Refer Electric Characteristics table MAX1873 data sheet more information about IOUT pin. ICHG/EN also used charge current disable charger. disable charger, place shunt across jumper voltage ICHG/EN board below 500mV. charger automatically enabled when shunt removed from jumper JU1, because pulled VREF through resistor (10k). Refer Table configurations. charge current ICHG/EN pin, replace voltage-divider resistors that input voltage between 700mV VREF. external with required output also connected ICHG/EN board charging current disable charger.
Current Limits
MAX1873 features input-source current limiting maximum-charge current limiting. When charge current load current exceed input current limit, charging current reduced. kit's source-current limit charging-current limit preset with current-sense resistors system-load current increases, remaining current made available charging. system-load current greater than will stop charging battery pack. user modify current limits replacing with resistors that will meet respective voltage drop specification proper current regulation. Refer Input Current Regulator Setting Charging Current Limit sections MAX1873 data sheet modify components current limits. Note: modified current limits higher than verify that rated accordingly.
Output Capacitor Selection
output capacitor reduced size value, depending upon charger being used. MAX1873R 68µF capacitor, MAX1873S 47µF capacitor, MAX1873T 33µF capacitor. capacitor with Refer MAX1873 data sheet more information.
Charging Lithium-Ion Cells
MAX1873 preset charge 4-series cells 4.2V each. cell voltage between 4.009V 4.387V replacing resistors with other standard resistors. charge three cell packs, replace MAX1873TEEE (U1) with MAX1873REEE MAX1873SEEE, respectively. Refer Voltage Regulator section MAX1873 data sheet instructions select resistors different charging voltage. Note: cell-battery termination voltage function battery chemistry construction. Consult battery manufacturer determine this voltage.
Table Jumper Functions
SHUNT POSITION Installed None ICHG/EN Connected Pulled VREF FUNCTION Charger shutdown Normal operation
Charging Nickel Cells
MAX1873 preset charge cells reconfigured supply current charge 10cell, Ni-based battery packs. Refer Charging NiMH NiCd Cells section MAX1873 data sheet more information.
Evaluates: MAX1873
MAX1873 Evaluation
Figure MAX1873 Schematic
0.033 SYSTEM LOAD 2.2µF CSSP
MAX1873T
CCSN DCIN 10µH 0.068 BATT+ ICHG/EN BATT VADJ OPEN IOUT 100k VREF OPEN 0.1µF 1000pF 0.047µF 100k 0.1µF 0.047µF 0.1µF OPEN 68µF OPEN 0.22µF 0.22µF 0.1µF 22µF 22µF 0.1µF VREF IOUT
ICHG/EN
AGND
NOTES: RESISTORS UNLESS OTHERWISE SPECIFIED.
MAX1873 Evaluation Evaluates: MAX1873
Figure MAX1873 Component Placement Guide- Component Side
Figure MAX1873 Board Layout-Component Side
Figure MAX1873 Board Layout-Solder Side
Figure MAX1873 Component Placement Guide- Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1873 Evaluation MAX1873 evaluation kit) complete, fully assemb

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