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| 19-1863; Rev 0; 11/00 MAX1772 Evaluation Kit General Description The MAX1772 evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. It uses analog inputs to control charge voltage and current. The EV kit can charge any battery with charge current up to 4A. High efficiency is achieved by a buck topology with synchronous rectification. The EV kit provides outputs that can be used to monitor the input current, battery charging current, and the presence of an AC adapter. The MAX1772 EV kit is a fully assembled and tested surface-mount printed circuit (PC) board. o Input Current Limiting o 0.7% Output Voltage Accuracy o Analog Inputs Control Charge Current and Charge Voltage o Monitor Outputs for: Current Drawn from AC Input Source Charging Current AC Adapter Presence o Up to 18.2V Battery Voltage o +8V to +28V Input Voltage Features Evaluates: MAX1772 Ordering Information PART MAX1772EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 28 QSOP o 4A (max) Battery Charge Current o Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. o Fully Assembled and Tested o Surface-Mount Components Component List DESIGNATION QTY DESCRIPTION 22F, 35V low-ESR tantalum capacitors AVX TPSE226M035R0300 or Sprague 593D226X0035E2W 1F, 50V ceramic cap (1210) Murata GRM42-2X7R105K050 0.47F, 25V ceramic capacitors (1206) Taiyo Yuden TMK316BJ474ML 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2B 0.022F ceramic capacitor (0805) 0.01F ceramic capacitors (0805) 1F, 10V ceramic caps (0805) Taiyo Yuden LMK212BJ105MG 0.1F, 50V ceramic capacitors (0805) Taiyo Yuden UMK212BJ104MG or Murata GRM40-034X7R104M050 D2 1 DESIGNATION C21, C22, C24 QTY 0 DESCRIPTION Not installed Schottky diode (DPAK) STM-Microelectronics STPS8L30B or ON Semiconductor MBRD630CT or Toshiba U5FWK2C42 30V, 3A Schottky diode Nihon EC31QS03L 100mA Schottky diodes (SOT23) Central Semiconductor CMPSH-3 or Hitachi HRB0103A 22H, 3.6A power inductor Sumida CDRH127-220 N-channel MOSFET Fairchild FDS6680 N-channel MOSFET Fairchild FDS6612A 0.040 1%, 1W resistor Dale WSL-2512-R040-F or IRC LR2512-01-R040-F C1-C4 4 D1 1 C5 1 C6, C7 2 C8 C9 C10, C11 C12, C13 1 1 2 2 D3, D4 2 L1 N1 N2 1 1 1 R1 1 C14-C20, C23 8 ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. MAX1772 Evaluation Kit Evaluates: MAX1772 Component List (continued) DESIGNATION R2 R3, R4 R19-R22 R5 R6 R7 R8 R9 R10 R11, R12 R13 R14, R15 R16 R17, R18 R23, R24 LED1 JU1 None QTY 1 0 1 1 1 1 1 1 2 1 2 1 2 2 1 1 1 DESCRIPTION 0.050 1%, 1W resistor Dale WSL-2512-R050-F or IRC LR2512-01-R050-F Not installed 8.2k 5% resistor (0805) 59k 1% resistor (0805) 19.6k 1% resistor (0805) 1M 5% resistor (0805) 15.4k 1% resistor (0805) 12.4k 1% resistor (0805) 1 5% resistors (0805) 33 5% resistor (1206) 4.7 5% resistors (1206) 220 5% resistor (0805) 51k 5% resistors (0805) 50k 20% potentiometers Mouser 569-68WR-50K or equivalent Green light-emitting diode (T-1) 6-pin header Shunt Rubber bumpers 3M SJ-5007 Mouser 517-SJ-5007BK or equivalent MAX1772EEI (28-pin QSOP) MAX1615EUK (5-pin SOT23) SN74AHC14PWR (14-pin TSSOP) Digi-Key 296-1086-1-ND MAX1772 PC board MAX1772 data sheet MAX1772 EV kit data sheet 5 and 6 SHUNT LOCATION 1 and 2 3 and 4 CELL PIN Connected to LDO Connected to R17/R18 divider Connected to GND NUMBER OF CELLS 4 3 2 The EV kit includes input source-current limiting and analog inputs for setting the charge voltage and charge current. The input current limit on the EV kit has been set to 5.1A. The voltage at ICTL, set by potentiometer R24 (50k) along with resistor R2 (0.050), sets the charging current (4A). The voltage at VCTL, set by potentiometer R23 (50k), adjusts the battery output voltage range. The VCTL range is from 0 to REFIN (3.3V). Refer to the MAX1772 data sheet for more detailed information. Selecting the Number of Cells The number of battery-pack cells is selected by jumper JU1 (Table 1). Place the shunt across JU1 pins to select the desired number of cells. This EV kit is shipped configured for 3 cells, 12.6V. Table 1. Jumper JU1 Functions None 4 AC Adapter Detection The AC adapter input voltage is connected through a voltage-divider (R6/R7) to ACIN of the MAX1772 to detect when AC power is available for charging. LED1 turns on whenever the AC adapter input voltage falls below 8V. U1 U2 U3 None None None 1 1 1 1 1 1 Current Measurement The board's ICHG pad is used to monitor the batterycharging current. The ICHG voltage range is 0 to 3V. VICHG is proportional to the charge current by: VICHG = 0.77 ICHG (V) The board's IINP pad is used to monitor the system input current. The IINP voltage range is 0 to 3V. VIINP is proportional to the AC adapter current by: VIINP = 0.496 IADAPTER (V) Refer to the Current Measurement section of the MAX1772 data sheet for information on V ICHG and VIINP. Detailed Description The MAX1772 EV kit includes all the circuitry needed to charge lithium-ion (Li+), NiMH, and NiCd batteries. The MAX1772 employs a high-efficiency step-down synchronous rectifier that controls both charging voltage and charging current. The control scheme is a constant off-time variable frequency, cycle-by-cycle current mode. 2 _______________________________________________________________________________________ U3-F JU1 1 D4 CMPSH-3 D1 EXTLOAD U3-D 9 U3-E LOAD C1 22F 35V C2 22F 35V LDO 1F 10V 2 R13 33 BST CCI CCS DLOV ACIN ACOK LX 5 6 13 REFIN DLO PGND 15 2 TP2 CSIP 14 2 R22 OPEN CSIN BATT 16 CELL ICHG LOAD 1 28 C20 0.1F IINP C15 0.1F 2 GND IN SHDN U1 MAX1615 4 3.3V C4 22F 35V 3 OUT 5/3 (FB) 1 JU1 2 4 3 6 5 10 R9 15.4k 1% C14 0.1F 17 C4 22F 35V C3 22F 35V 18 C19 0.1F ICTL C18 0.1F R20 OPEN 1 R24 50k 20% 3 LD0 R18 51k R17 51k VCTL 19 20 1 3 2 R11 1 21 R19 OPEN TP1 R21 OPEN N2 4 23 1 3 2 8 7 L1 22H DHI 24 N1 4 C23 0.1F 5 6 8 7 22 1 25 D3 CMPSH-3 3 C21 OPEN 11 10 8 5 6 CSSP 3 C5 0.022F 50V R15 4.7 C13 8.2F 10V R3 SHORT CSSN 3 CLS MAX1772 LDO 2 U1 R4 OPEN C9 0.022F R5 8.2k 7 CCV 6 5 C11 0.01F 11 12 R8 1M (CUT HERE) 3.3V JU3 3 2 1 C10 0.01F R7 19.6k 1% U3-A 1 8 GND 9 GND 1 DCIN 4 REF C6 0.47F 25V C7 0.47F 26 25V C21 OPEN R1 0.04 1% 1W 27 R14 4.7 U3-C 2 13 12 ADAPTER_IN GND Figure 1. MAX1772 EV Kit Schematic R6 59k 1% JU2 C16 0.1F 3 1 R23 50k 20% C22 OPEN R12 1 R2 0.050 1% 1W GND BATT 5 R10 12.4k 1% 3.3V C17 0.1F U3-B 4 3 2 14 R16 220 7 LE01 ICHG IINP Evaluates: MAX1772 _______________________________________________________________________________________ JU1 1-2 3-4 5-6 CELLS 4 3 2 NOTE: ALL RESISTORS ARE 5% UNLESS OTHERWISE NOTED. MAX1772 Evaluation Kit 3 MAX1772 Evaluation Kit Evaluates: MAX1772 1.0" 1.0" Figure 2. MAX1772 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1772 EV Kit PC Board Layout--Component Side 1.0" 1.0" Figure 4. MAX1772 EV Kit PC Board Layout--Solder Side Figure 5. MAX1772 EV Kit Component Placement Guide-- Solder Side 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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