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19-4785; Rev 0; 11/98
MAX1612 Evaluation Kit
General Description
The MAX1612 evaluation kit (EV kit) is a complete bridge-battery management circuit. A small 2.4V, 50mAh NiCd battery, similar to the type commonly used in bridge circuits of notebook computers, is mounted on the board. When the main power source is disconnected, the MAX1612 boosts the 2-cell bridge battery voltage to 6V to power the load. The MAX1612 also controls the battery's trickle charge cycle. The MAX1612 evaluation board can also be used to evaluate the MAX1613. Simply order a free sample of the MAX1613EEE and replace the MAX1612 with the MAX1613. o Bridge-Battery Charger o 6V, 50mA Bridge Output o 5V Linear Regulator o Input Voltage Disconnect Detection o Fully Assembled and Tested Surface-Mount Board
Features
Evaluates: MAX1612/MAX1613
Ordering Information
PART MAX1612EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP
Component List
DESIGNATION QTY BATT1 C1 C2 C3 C4 C5 1 1 1 1 1 1 DESCRIPTION 2.4V, 50mAh NiCd battery pack TNR Technical N50AAAF2SMT (2 x Sanyo N50AAA) 0.33F ceramic capacitor 4.7nF ceramic capacitor 68nF ceramic capacitor 1F ceramic capacitor 100F, 10V low-ESR tantalum cap AVX TPSD107M010R0100 or Sprague 593D107X0010D2W 22F, 35V low-ESR tantalum cap AVX TPSE226M035R0300 or Sprague 593D226X0035E2W Not installed 30V, 500mA Schottky diode Motorola MBR0530 Not installed DESIGNATION QTY L1 J1-J5 R1 R2 R3 R4 R5 R6 R7, R8 SW1 U1 None None None 1 5 1 1 1 1 1 1 2 1 1 5 1 1 DESCRIPTION 22H, 800mA power inductor Coilcraft DS1608C-223, Sumida CD43-220, or equivalent 2-pin jumpers Not installed 2.2k, 5% resistor 442k, 1% resistor 20k, 1% resistor 200k, 1% resistor 160k, 5% resistor 470k, 5% resistors Momentary switch MAX1612EEE Shunts MAX1612 printed circuit board MAX1612/MAX1613 data sheet
C6 C7 D1 D2
1 0 1 1
Component Suppliers
SUPPLIER Coilcraft Coiltronics Sprague Sumida TNR Technical PHONE 847-639-6400 561-241-7876 603-224-1961 847-956-0666 714-253-9944 FAX 847-639-1469 561-241-9339 603-224-1430 847-956-0702 714-253-9949
Quick Start
The MAX1612 EV kit is shipped with the on-board battery disconnected. The battery must be charged before use. Follow these steps to charge the battery and verify board operation. Do not turn on the power supply until all connections are completed. 1) Install a shunt across all jumpers to set the board for operation without external signals. Note: Be sure to reinstall the shunt across J2; prior to shipment, this shunt was removed to disconnect the battery.
1
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MAX1612 Evaluation Kit Evaluates: MAX1612/MAX1613
2) Connect a 15V power supply to the VCHARGE pad and voltmeters to the FULL and VMAIN pads. 3) Turn on the power supply and momentarily press Switch SW1 to reset the internal counter. Then verify that the voltmeter attached to the FULL pad indicates a logic-low level (< 0.4V). Jumper J3 connects the FULL pin to the CCMD pin, placing the MAX1612 in the battery-charge mode. The voltmeter attached to the VMAIN pad will read the input voltage. 4) The battery will take up to 16 hours to charge. Full charge is indicated when the FULL pin goes high (> 2.4V). 5) Physically disconnect the input supply, and the VMAIN voltage will be held above 6V by the MAX1612.
Note: The board may be operated using an external 2.4V power supply instead of the on-board battery by removing the shunt across jumper J2 and attaching the supply to the BBATT pin.
Detailed Description
The MAX1612 evaluation board can be operated with or without external control. With shunts across J1-J5, the board will drive VMAIN to 6V when VCHARGE is removed and will control the charging of the bridge battery whenever VCHARGE is greater than 7V. Alternatively, the shunts across J3-J5 can be removed and external signals used to control the board.
Jumper Selection
The jumpers on the board may be removed to allow alternate batteries or to control the MAX1612 with external signals. Table 1 lists the jumpers and their functions.
Component Selection
The capacitor values controlling the charge and discharge timers will need to be adjusted for each application. The ideal charge time depends on the charge current set by R2 and the actual battery being used. The discharge time depends on the load during the discharge cycle. Refer to the MAX1612 data sheet for instructions on selecting values for your application. Resistor R1 and diode D2 may be installed to provide a low-level current to compensate for the bridge battery's self-discharge.
Table 1. Jumper Functions
JUMPER SHUNT POSITION Shorted Open Shorted -J2 Open Shorted J3 Open Shorted J4 Open BBON pin open On-board battery disconnected CCMD pin connected to the FULL pin CCMD pin open BBON pin connected to the LBO pin PIN CONNECTION VCHARGE connected to VMAIN VCHARGE disconnected On-board battery connected Normal connection An external battery or power supply may be connected to the BBATT pad. Charges the battery whenever the FULL pin goes low. Charge cycle controlled by an external signal connected to the CCMD pad. Turns on the DC-DC converter whenever the LBO pin goes low. DC-DC converter controlled by an external signal connected to the BBON pad. See Figure 2 in the MAX1612 data sheet. The internal timer counts down whenever the LBO pin is low. The countdown function is controlled by an external signal connected to the DCMD pad. MAX1612 OPERATION Normal connection
-J1
Shorted J5 Open
DCMD pin connected to the LBO pin DCMD pin open
2
_______________________________________________________________________________________
VCHARGE J1
R1 OPEN D1 MBR0530 VMAIN C6 22F L1 22H 3 LX LRI VL 16 R2 2.2k
BBATT
Figure 1. MAX1612 EV Kit Schematic
J2 D2 OPEN C5 100F
BATT1 2.4V, 50mAh
MAX1612
2 BBATT LRO C4 1F ISET 9 15 LRO
ISET 1 C1 0.33F FB VL R7 470k R8 470k 8 FULL LBI 10
R3 442k
SW1
R4 20k
FULL
J3 7 CCMD
CCMD
R5 200k
LBO 4 J4 R6 160k C7 OPEN LBO
CC
12 C3 68nF
GND
BBON
5
BBON
CD
13 C4 4.7nF 6
J5
DCMD
DCMD GND 11 PGND 14
Evaluates: MAX1612/MAX1613
_______________________________________________________________________________________
MAX1612 Evaluation Kit
3
MAX1612 Evaluation Kit Evaluates: MAX1612/MAX1613
1.0"
Figure 2. MAX1612 EV Kit Component Placement Guide-- Component Side
1.0"
1.0"
Figure 3. MAX1612 EV Kit PC Board Layout--Component Side
Figure 4. MAX1612 EV Kit PC Board Layout--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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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