MAX1906EVKIT Maxim Integrated, MAX1906EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX1906EVKIT
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX1906r

The MAX1906 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Do not turn on the battery charger
until indicated:
1) Verify that shunts are not installed on jumpers JU1,
2) Verify that shunts are installed on jumper JU6 and
3) Connect the positive terminals of three voltmeters to
4) Connect the positive terminal of a 3.3V source to
5) Measure the voltage across the 4-cell battery pack.
6) Connect the 4-cell (series connected) Li+ battery
For test purposes, the Li+ cells can be replaced by four
floating power supplies
7) Verify that the voltage across OUT and PACK- is
8) Disable the battery charger.
9) Connect the positive terminal of the battery charger
10) Enable the battery charger.
11) Force overcharge conditions and observe that OUT
Note: In this configuration, fuse protection is disabled
and the EV kit does not provide overvoltage protection.
The current that would destroy the fuse in an over-
charge condition is limited and sunk through resistor
R5. Charging must be manually monitored. Enable fuse
protection (one time) by removing the shunt across JU6
and installing it on JU3.
MAX1906 Evaluation Kit
2
JU2, and JU3 (fuse protection is disabled).
across pins 1 and 2 of jumper JU5.
the OUT, DRV, and DISCON pads. Connect the neg-
ative terminal of the voltmeters to the PACK- pad.
the VI/O pad. Connect the negative terminal of the
source to the PACK- pad.
pack across BN and BATT4+. Observe the correct
Li+ battery-pack polarity.
a) Connect the negative terminal of the first cell to
b) Connect the positive terminal of the first cell to
c) Connect the positive terminal of the second cell
d) Connect the positive terminal of the third cell to
e) Connect the positive terminal of the fourth cell
approximately the voltage measured in step 5.
to PACK+. Connect the negative terminal of the bat-
tery charger to PACK-.
is pulled low and DRV is driven to approximately 5V.
_______________________________________________________________________________________
BN.
BATT1+.
to BATT2+.
BATT3+.
to BATT4+.
Quick Start
The MAX1906 EV kit is a complete, fully assembled and
tested circuit board that is used to evaluate the
MAX1906X Li+ battery-pack protector. The MAX1906X
is designed to protect an Li+ battery pack, where 4 cells
are connected in series. The EV kit protects against
potentially hazardous conditions by disconnecting the
battery pack from the battery charger. This is accom-
plished by blowing the protection fuse in the circuit
when any individual cell in the pack exceeds the over-
voltage protection threshold.
The MAX1906 EV kit does not require an external power
source for the EV kit to function. The EV kit uses the
battery pack as the power source. Connect the Li+ bat-
tery pack across BATT4+ and BN pads and the battery
charger across PACK+ and PACK- pads.
The battery-pack terminals and all intermediate cell
connection points must be connected to their corre-
sponding input pads on the EV kit:
1) Connect the negative terminal of the first cell to BN.
2) Connect the positive terminal of the first cell to
3) Connect the positive terminal of the second cell to
4) Connect the positive terminal of the third cell to
5) Connect the positive terminal of the fourth cell to
The MAX1906 EV kit disconnects the battery charger
from the battery pack by blowing fuse F1 with high cur-
rent when overcharging is detected. The fuse can only
be used once and must be replaced if it is opened by
overcharge detection. However, for repeated EV kit
evaluation, the fuse can be bypassed by configuring
JU3 and JU6 to redirect the high current through power
resistor R5. Remove the shunt across JU3 and install
the shunt across JU6 to avoid destroying the fuse. R5
limits the maximum current drawn in a fault condition to
31mA. Monitor all charging conditions of the battery
pack when JU3 is open (fuse is disabled).
BATT1+.
BATT2+.
BATT3+.
BATT4+.
Detailed Description
One-Time Fuse
Inputs