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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 discon-
nected, 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
0°C to +70°C
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)
0.33µF ceramic capacitor
4.7nF ceramic capacitor
68nF ceramic capacitor
1µF ceramic capacitor
100µF, 10V low-ESR tantalum cap
AVX TPSD107M010R0100 or Sprague
593D107X0010D2W
22µF, 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
22µH, 800mA power inductor
Coilcraft DS1608C-223,
Sumida CD43-220, or equivalent
2-pin jumpers
Not installed
2.2kΩ, 5% resistor
442kΩ, 1% resistor
20kΩ, 1% resistor
200kΩ, 1% resistor
160kΩ, 5% resistor
470kΩ, 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 bat-
tery 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
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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 indi-
cates a logic-low level (< 0.4V). Jumper J3 con-
nects 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 volt-
age.
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 exter-
nal signals. Table 1 lists the jumpers and their func-
tions.
Component Selection
The capacitor values controlling the charge and dis-
charge timers will need to be adjusted for each appli-
cation. 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 connect-
ed 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
22µF
L1
22µH
3
LX
LRI
VL
16
R2
2.2k
BBATT
Figure 1. MAX1612 EV Kit Schematic
J2
D2
OPEN
C5
100µF
BATT1
2.4V, 50mAh
MAX1612
2
BBATT
C4
1µF
ISET
9
LRO
15
LRO
ISET
1
C1
0.33µF
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
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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