MAX1501EVKIT Maxim Integrated, MAX1501EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1501EVKIT
• Description: Battery Management Evaluation Kit for the MAX1501
• Manufacturer: Maxim Integrated
• Series: MAX1501r

Specifications of MAX1501EVKIT

• Battery Type: Li-Ion, Li-Pol, NiCD, NiMH
• Operating Supply Voltage: 0 V to 13 V
• Charge Safety Timers: Yes
• Operating Supply Current: 5 mA
• Product Type: Charge Management
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 4 V
• Uvlo Stop Threshold: 4.25 V

Table 2. Jumper JU2 (FULLI)
Table 3. Jumper JU3 (TEMP)
The MAX1501 EV kit features jumper JU2 that allows
the user to program the top-off current threshold to a
percentage of the fast-charge current. If the fast-
charge current falls below the programmed threshold,
the charger turns off the red LED and turns on the
green LED, signaling that charging is complete. During
the top-off stage, the charger continues to source cur-
rent to the battery until the timer expires. See Table 2
for jumper JU2 configuration to set the top-off current
threshold.
The MAX1501 EV kit features jumper JU3, which allows
the user to set the MAX1501 maximum operating die
temperature. During charging, if the die approaches
the programmed temperature setting, the charger
reduces the charging current to keep the die tempera-
ture from exceeding that value. See Table 3 for jumper
JU3 configuration to set the die temperature threshold.
The MAX1501 charger can be programmed to operate
in several different modes by asserting logic-level sig-
nals to the CHGEN and MODE input pins. The
MAX1501 EV kit includes jumpers JU4 and JU5, which
allow the user to assert logic levels to these pins. A
logic high (H) can be asserted on the CHGEN and
MODE pins by placing the shunts across pins 1 and 2
of jumpers JU5 and JU4, respectively. A logic low (L)
can be asserted on the CHGEN and MODE pins by
placing the shunts across pins 2 and 3 of jumpers JU5
LOCATION
LOCATION
SHUNT
SHUNT
1 and 2
2 and 3
1 and 2
2 and 3
None
None
Temperature Regulation Setting
Connected to GND
Connected to GND
Connected to VL
Connected to VL
FULLI PIN
TEMP PIN
_______________________________________________________________________________________
Floating
Floating
Top-Off Current Threshold
Modes of Operation
20% of fast-charge
current
30% of fast-charge
current
10% of fast-charge
current
TEMPERATURE (°C)
TOP-OFF CURRENT
MAXIMUM DIE
+135
+115
+95
MAX1501 Evaluation Kit
and JU4, respectively, or by removing the shunts from
the jumpers. The internal pulldown resistors on the
CHGEN and MODE pins automatically assert a logic
low when the shunts are removed from the jumpers.
See Table 4 to configure the EV kit charging mode of
operation.
The charging regulation voltage is dependent on the
mode of operation and can be selected by configuring
the SELV input pin with jumper JU6. In Li+ charge
mode, the regulation voltage can be set to 4.1V or 4.2V.
In NiMH/NiCd charge mode, the regulation voltage can
be set to 4.5V or 4.95V. In no-battery mode, the charger
regulates the output voltage to 4.0V, regardless of the
SELV setting (see Table 4 to configure jumper JU6). The
internal pullup resistors on the SELV pin automatically
assert a logic high when the shunt is removed from the
jumper.
In Li+ charge mode, the MAX1501 charger uses volt-
age, current, and thermal-control loops to facilitate
charging of a single Li+ cell and to protect the battery.
When an Li+ battery with a cell voltage below 2.8V is
inserted, the MAX1501 charger enters the prequalifica-
tion stage where it precharges that cell with 10% of the
user-programmed fast-charge current. Once the cell
has passed 2.8V, the charger enters the fast-charge
stage where it increases the charging current by 10%
steps every 20ms until the charger reaches 100% fast-
charge current programmed by resistor R1. During pre-
charge and fast charge, the red LED is on and the
green LED is off. As the battery voltage approaches the
4.2V/4.1V user-selected regulation voltage (SELV pin,
JU6), the charging current is reduced. If the charging
current drops below the top-off current setting (FULLI
pin, JU2) or if the charge timer expires (TMAX pin,
Table 4. Programming Charging Modes
and Regulation Voltage
*Does not require shunt on jumper
X = Don’t care
CHGEN
(JU5)
L*
L*
H
H
MODE
(JU4)
L*
L*
H
H
CHARGING
NiMH/NiCd
Li+ charge
No-battery
Disable
charge
MODE
mode
Regulation Voltage
SELV
(JU6)
Li+ Charge Mode
H*
H*
L
L
X
X
VOLTAGE (V)
BATT+
4.95
N/A
4.1
4.2
4.5
4.0
3