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19-3362; Rev 0; 8/04
MAX1870A Evaluation Kit
General Description
The MAX1870A 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 2.4A. High efficiency is achieved by a buck-boost topology. The EV kit provides outputs that can be used to monitor the input current and the presence of an AC adapter. The MAX1870A EV kit is a fully assembled and tested surface-mount printed circuit (PC) board. Step-Up/Step-Down Topology Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. +10V to +25V Input Voltage Range 2.4A (max) Battery Charge Current Up to 17.6V Battery Compliance Voltage 0.5% Charge-Voltage Accuracy Input Current Limiting Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit Analog Output Indicates Input Current Fully Assembled And Tested Surface-Mount Components
Features
Evaluates: MAX1870A
Ordering Information
PART MAX1870AEVKIT TEMP RANGE 0C to +70C IC PACKAGE 32 Thin QFN 5mm x 5mm
Component List
DESIGNATION C1, C7, C13, C14 QTY DESCRIPTION 1F 20%, 10V X5R ceramic capacitors (0805) Taiyo Yuden LMK212BJ105KG or TDK C2012X5R1A105M 0.01F 10%, 50V X7R ceramic capacitors (0805) Murata GRM216R71H103K 1F 10%, 25V X7R ceramic capacitor (0805) TDK C2012X7R1E105K 0.1F 10%, 25V X7R ceramic capacitor (0603) Murata GRM188R71E104K or TDK C1608X7R1E104K 22F 20%, 25V X5R ceramic capacitors (1812) TDK C4532X5R1E226M DESIGNATION C9 C16, C17 QTY 0 2 DESCRIPTION Not installed (1812) 2.2F 10%, 25V X5R ceramic capacitors (1206) TDK C3216X7R1E225K 3A, 30V Schottky diodes Nihon EC31QS03L 2-pin header 3-pin header 10H, 4.4A power inductor Sumida CDRH104R-100 or TOKO 919AS-100M Dual n- and p-channel MOSFET (SO-8) Vishay/Siliconix Si4542DY 1k 5% resistor (0805) 470k 5% resistor (0805) Not installed (0805)
4
C2, C3, C4
3
D2, D3 JU1 JU2 L1
2 1 1 1
C5
1
C6
1
Q1 R2 R3 R4, R16-R19
1 1 1 0
C8, C10, C11
3
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1870A Evaluation Kit Evaluates: MAX1870A
Component List (continued)
DESIGNATION R5, R11 R7, R9, R10 R8 R12 R13 R14 R15 QTY 2 3 1 1 1 0 1 DESCRIPTION 10k 5% resistors (0805) 0.030 1%, 1/2W resistors (2010) Dale WSL-2010-R030-F or IRC LRC-LR2010-01-R030-F 10k 1% resistor (0805) 30 5% resistor (0805) 620 5% resistor (0805) Not installed, 50k potentiometer 50k potentiometer Mouser 652-3266X-1-503 or equivalent MAX1870AETJ (32-TQFN 5mm x 5mm) Shunt MAX1870A PC board
Shutdown (Jumper JU1)
Jumper JU1 either enables the MAX1870A or places it into shutdown. See Table 1 for jumper settings.
Table 1. Jumper JU1 Functions
SHUNT LOCATION Installed Not installed SHDN PIN Connected to GND. Connected to REFIN with a 10k resistor. MAX1870A MAX1870A disabled. MAX1870A enabled.
Selecting the Number of Cells
The number of battery-pack cells is selected by jumper JU2 (Table 2). Place the shunt across the JU2 pins to select the desired number of cells. This EV kit is shipped configured for 3 cells.
U1 None None
1 1 1
Table 1. Jumper JU2 Functions
SHUNT LOCATION 1 and 2 Not installed 2 and 3 CELLS PIN Connected to REFIN Floating Connected to GND NUMBER OF CELLS 4 3 2
Detailed Description
The MAX1870A EV kit includes all of the circuitry needed to charge Li+, NiMH, and NiCD batteries. 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 3.5A. The voltage at ICTL, set by potentiometer R15 (50k) along with resistor R10 (0.030), sets the charging current (0 to 2.4A). The voltage at VCTL is set to VL by JU4. This sets the battery-voltage set point at 4.2V times the number of cells. The voltage at VCTL can also be set by resistor-divider R16/R17 or by potentiometer R14 (open), which adjusts the battery output voltage. Refer to the MAX1870A data sheet for more information.
Input Current Measurement The board's IINP pad is used to monitor the system input current. The IINP voltage range is 0 to 3.5V. VIINP is proportional to the AC adapter current by: VIINP = 0.84 x IADAPTER (V) Refer to the Input Current Measurement section of the MAX1870A data sheet for information on VIINP.
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_______________________________________________________________________________________
MAX1870A Evaluation Kit
Component Suppliers
SUPPLIER Central Semiconductor IRC Murata Nihon Sumida Taiyo Yuden TDK TOKO Vishay PHONE 631-435-1110 361-992-7900 770-436-1300 847-843-7500 847-545-6700 800-348-2496 847-803-6100 847-297-0070 402-564-3131 FAX 631-435-1824 361-992-3377 770-436-3030 847-843-2798 847-545-6720 847-925-0899 847-390-4405 847-699-1194 402-563-6296 WEBSITE www.centralsemi.com www.irctt.com www.murata.com www.niec.co.jp www.sumida.com www.t-yuden.com www.component.tdk.com www.tokoam.com www.vishay.com
Evaluates: MAX1870A
Note: Indicate that you are using the MAX1870A when contacting these component suppliers.
_______________________________________________________________________________________
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Evaluates: MAX1870A
MAX1870A Evaluation Kit
Figure 1. MAX1870A EV Kit Schematic
C5 1F 25V 8 GND REF CSSP CLS U1 R9 0.03 1% 3 27 Q1-B 5 8 I.C. 1 C16 2.2F 25V 24 2 Q1-A D3 7 6 L1 10H D2 R10 0.03 1% C10 22F 25V C11 22F 25V 4 C8 22F 25V C9 OPEN 31 LOAD R7 0.03 1% 2 C1 1F 10V R3 470k 3 R4 OPEN 26 VHN 30 CSSS 32 DCIN 28 VHP C7 1F 10V
4
MAX1870A
4 GND DHI 5 CCV CCI CCS 6 C3 0.01F 7 C4 0.01F 9 REFIN CSIN 19 21 16 R11 10k REFIN SHDN JU4 DLOV 11 VCTL 1 C14 1F 10V ICTL PGND 23 CELLS 13 REFIN 1 JU2 2 3 R2 1k REFIN LDO R18 OPEN TP2 12 R19 OPEN R15 50k 20% R12 30 TP1 25 JU1 C13 1F 10V 15 SS BATT+ BATT17 10 ASNS DBST 22 20 I.C. 18 CSIP REFIN R5 10k CSSN C17 2.2F 29 BLKP 14 IINP I.C. BATT C6 0.1F R8 10k 1% VL 5.4V R13 REFIN (3.3V) 620 JU3 # CELLS 2 3 4 JU2 CELLS PIN 2-3 GND NOT FLOATING INSTALLED 1-2 REFIN
ADAPTER_IN
25V MAX
GND
C2 0.01F
REFIN
ASNS
IINP
REFIN
VL
3
R14 OPEN
2
R16 OPEN
_______________________________________________________________________________________
1
R17 OPEN
MAX1870A Evaluation Kit Evaluates: MAX1870A
Figure 3. MAX1870A EV Kit PC Board Layout--Component Side
Figure 2. MAX1870A EV Kit Component Placement Guide-- Component Side
Figure 4. MAX1870A EV Kit PC Board Layout--Solder Side
Figure 5. MAX1870A 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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