MAX1894/MAX1924 Evaluation MAX1894 evaluation kit) fully assemble

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MAX1894/MAX1924 Evaluation MAX1894 evaluation kit) fully assemble

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19-2508; 7/02
MAX1894/MAX1924 Evaluation
MAX1894 evaluation kit) fully assembled tested circuit board. uses MAX1894 lithiumion (Li+) battery-pack protector protect four series cell battery packs against overvoltage, undervoltage, excessive charge/discharge currents, battery pack-short conditions. Three external P-channel MOSFETs control charge discharge paths battery pack. MAX1894 provides inputs, which used microcontroller (µC) control protection MOSFETs MAX1894 shutdown mode. also evaluates MAX1924. Protects Against Cell Overvoltage Protects Against Cell Undervoltage Protects Against Excessive Charge/Discharge Currents Pack-Short Conditions 0.8µA (typ) Shutdown Supply Current Prevents Deep Discharge Cells Operating Supply Current, 30µA (typ) Small 16-Pin QSOP Package Fully Assembled Tested
Features
Evaluates: MAX1894/MAX1924
Ordering Information
PART MAX1894EVKIT TEMP RANGE +70°C PACKAGE QSOP
Component List
DESIGNATION DESCRIPTION 4.7µF ±20%, 6.3V ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG 0.1µF ±10%, ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 0.1µF ±20%, ceramic capacitors (0805), installed ±10%, 6.3V ceramic capacitor (0603) C1608X5R0J105K 0.1µF ±10%,16V ceramic capacitors (0603) Taiyo Yuden EMK107BJ104KA 2.2µF ±10%, ceramic capacitor (1206) C3216X7R1E225K 0.1µF ±10%, ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG, installed 100mA, 30V, Schottky diode, SOT23 Central Semiconductor CMPSH-3 DESIGNATION JU1, JU2, JU4, DESCRIPTION Nonisolated banana jacks 3-pin headers 2-pin headers -0.13A, -50V, P-channel MOSFET, SOT23 Fairchild Semiconductor BSS84 -30V, P-channel MOSFETs 8-pin Vishay Siliconix Si4435DY International Rectifier Si4435DY resistor (2512) 0.02 ±1%, resistor (2512) LRC-LRF 2512-01-R020-F resistor (0805) resistors (0805) resistor (0805) 5-pin terminal block MAX1894XEEE, 16-pin QSOP MAX1615EUK-T, 5-pin SOT23 Shunts (JU1-JU5) MAX1894 board MAX1894 data sheet MAX1894 data sheet
None None None None
C10, C11, C13,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1894/MAX1924 Evaluation Evaluates: MAX1894/MAX1924
Component Suppliers
SUPPLIERS Fairchild Semiconductor International Rectifier Taiyo Yuden Vishay Siliconix PHONE 888-522-5372 310-322-3331 361-992-7900 800-348-2496 847-803-6100 408-988-8000 972-910-8023 310-726-8721 361-992-3377 847-925-0899 847-390-4405 408-567-8979 WEBSITE www.fairchildsemi.com www.irf.com www.irctt.com www.t-yuden.com www.component.tdk.com www.vishay.com
Note: Please indicate that using MAX1894 MAX1924 when contacting these component suppliers.
Quick Start
MAX1894 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed.
MAX1894
CELL
Recommended Equipment
Current-limited power supply charger) voltmeter Four cells (2.3V 4.35V) Warning: Exercise caution when handling loose cells. Obey manufacturer guidelines handling cells. test purposes, floating power supplies substituted cells.
POWER SUPPLY PACK+
CELL
PACK
CELL
CELL1
Jumper Setting Connecting Cells
Install shunt across pins jumper JU1. Install shunt across pins jumpers JU3. Install shunt across jumper JU4, remove shunt from jumper JU5. Figure connecting cells (steps 12). Connect negative terminal cell terminal block TB1. Connect positive terminal cell terminal block TB1. Connect negative terminal cell terminal block TB1. Connect positive terminal cell terminal block TB1. Connect negative terminal cell terminal block TB1. Connect positive terminal cell terminal block TB1. Connect negative terminal cell terminal block TB1.
Figure Connecting Cell, Power Supply, Voltmeter
Connect positive terminal cell terminal block TB1.
Connecting Power Supply
Figure connecting power supply (steps below). power supply should current limited more than rate battery pack. Using short banana leads, connect negative terminal power supply (PACK-). Turn power supply power-supply voltage 4.2V number cells series. Momentarily connect positive terminal power supply (JACK+). Remove positive terminal power supply from PACK+, verify that DSO, CGO, pads pulled low. Momentarily short PACK+ PACK- pads with short banana lead. Verify that DSO, CGO, pads pulled high. Reconnect positive terminal power supply (PACK+).
MAX1894/MAX1924 Evaluation
Verify that DSO, CGO, pads pulled low.
Note: Short leads less than long.
Detailed Description
MAX1894 protects battery cells against charge/discharge faults. designed both 4-cell applications. configured from factory 4-cell application with MAX1894X installed. 3-cell application, replace MAX1894X with MAX1924V reconfigure jumper (see Table monitors voltage across each cell provide protection against undervoltage overvoltage conditions. also monitors voltage across current-sense resistor (R2) protect against excessive charge discharge current, pack short conditions. MAX1894 also features MAX1615 lowpower linear regulator, configurable 3.3V power linear regulator provide 30mA 28V. charge discharge paths battery pack controlled three P-channel MOSFETs: trickle-charge MOSFET overdischarge MOSFET overcharge MOSFET event fault condition, some these protection MOSFETs turned disconnect battery pack from current path. MAX1894 provides logic-level inputs, which connected general-purpose input/output (GPIO) lines from These inputs used turn three protection MOSFETs, MAX1894 shutdown mode minimizing current consumption during pack storage. Trickle-Charge Operation When MAX1894 undervoltage deep discharge state (VCC 4.5V typ), circuit operates trickle-charge mode. During trickle-charge operation, MOSFETs turned MOSFET turned provide lower current charge path battery pack. Refer Fast Trickle-Charge Paths section MAX1894 data sheet. Normal Operation When cell voltages greater than 2.36V, MAX1894 operates normal mode readily charge discharge. During normal operation, three MOSFETs (P1, turned provide current path battery pack. voltage across current-sense resistor (R2) monitors charge discharge current during normal operation.
Shutdown MAX1894 goes into shutdown mode when undervoltage fault occurs when logic high applied shutdown (SHDN). During shutdown mode, quiescent current 0.8µA (typ). Control control (CTL) MAX1894 connected GPIO lines turn protection MOSFETs simultaneously. Discharge Current Protection When discharge current exceeds 7.25A (IOD_TH VOD_TH/R2) more than 3ms, protection MOSFETs turned off, disconnecting battery pack from current path. Charge-Current Protection When charge current exceeds OC_TH OC_TH /R2) more than 3ms, trickle-charge MOSFET overcharge MOSFET turned off, disconnecting battery pack from current path. Pack-Short Current Protection When discharge current exceeds second higher current limit, (IPS_TH VPS_TH/R2) more than 450µs, protection MOSFETs turned off, disconnecting battery pack from current path.
Evaluates: MAX1894/MAX1924
Jumper Selection
Enable Jumper enables power supply connecting input MAX1615 B4_P. Install shunt enable VDD. Remove shunt from disable VDD. Table shunt positions. Selection Jumper selects output voltage VDD. +5V, install shunt across pins JU1. +3.3V, install shunt across pins JU1. Table shunt positions. MAX1894 Shutdown Jumper selects shutdown mode. shut down part, install shunt across pins JU2. enable part, install shunt across pins JU2. shutdown mode also driven external connected SHDN pad. external shutdown mode, remove shunt from connect output SHDN pad. Table shunt positions.
MAX1894/MAX1924 Evaluation Evaluates: MAX1894/MAX1924
Table Jumper Selection
JUMPER SHUNT POSITION 1-2* 2-3* OUTPUT VOLTAGE +3.3
shunt must installed these selections.
3-Cell/4-Cell Selection Jumper selects between 3-cell 4-cell battery pack applications MAX1894 kit. MAX1894 factory 4-cell applications. 3-cell battery pack applications, install shunt across JU5, replace with MAX1924V. Table shunt positions.
Table Jumper Selection
JUMPER SHUNT POSITION None FUNCTION Shutdown mode enabled Shutdown mode disabled Shutdown mode controlled external controller
Table Jumper Selection
JUMPER SHUNT POSITION Installed None FUNCTION MAX1615 enabled MAX1615 disabled
Table Jumper Selection
JUMPER SHUNT POSITION None FUNCTION Control mode enabled (FETs OFF) Control mode disabled Control mode controlled external controller
Table Jumper Selection
JUMPER SHUNT POSITION Installed None FUNCTION series cells series cells
Control Jumper selects logic state control MAX1894. force logic high control pin, install shunt across pins JU3. force logic control pin, install shunt across pins JU3. control mode also driven external Remove shunt from jumper connect output pad. Table shunt positions.
MAX1894/MAX1924 Evaluation Evaluates: MAX1894/MAX1924
0.1µF
B4_P PACK+ 2.2µF PACK+ BANANA OPEN
PACKJU2 SHDN MAX1894
SHDN
OPEN OPEN OPEN TB1-1 TB1-2 B4_P B3_P PACK- 4.7µF TB1-3 B2_P MAX1615 (FB)
0.1µF
OPEN OPEN PACK+ PACK10 0.02 B4_P
SHDN
0.1µF 0.1µF TB1-4 0.1µF B1_P
BANANA
TB1-5
Figure MAX1894 Schematic
MAX1894/MAX1924 Evaluation Evaluates: MAX1894/MAX1924
Figure MAX1894 Component Placement Guide- Component Side
Figure MAX1894 Board Layout-Component Side
Figure MAX1894 Board Layout-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 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1894/MAX1924 Evaluation MAX1894 evaluation kit) fully assemble

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