MAX1501EVKIT Maxim Integrated, MAX1501EVKIT Datasheet - Page 2

• 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

The MAX1501 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Do not turn on the power supply
until indicated:
1)
2)
3)
4)
5)
6)
7)
8)
9)
10) The red LED D1 turns on and the green LED D2
The MAX1501 EV kit demonstrates the highly integrat-
ed, stand-alone, MAX1501 linear battery charger for a
single-cell Li+ battery or a 3-cell NiMH/NiCd battery
pack. The EV kit safely charges a single Li+ battery to
4.1V or 4.2V or 3-cell NiMH/NiCd to 4.5V or to 4.95V
with a microprocessor to control the charge sequence.
The EV kit accepts a power-supply input of 4.5V to 13V,
but disables charging when the input voltage exceeds
6.5V to prevent incorrect AC adapter inputs and exces-
sive power dissipation during charging. Jumpers on the
EV kit allow access to the MAX1501 input pins to con-
figure the total charging time, battery voltage levels,
top-off current, die temperature regulation levels, and
MAX1501 Evaluation Kit
2
_______________________________________________________________________________________
Verify that shunts are installed across pins 2 and 3
of jumpers JU1 (3hr charge time), JU2 (top-off set
to 10% of fast-charge current), and JU3 (+95°C
regulated maximum die temperature).
Verify that shunts are installed across pins 2 and 3
of jumpers JU4 (MODE) and JU5 (CHGEN) to pro-
gram the EV kit for Li+ charge mode.
Verify that a shunt is installed across pins 1 and 2
of jumper JU6 to set the charging voltage to 4.2V.
Connect a 3V to 5.5V source across the VLOGIC
and GND pads of the EV kit.
Connect a voltmeter across the ACOK and GND
pads of the EV kit.
Observe correct Li+ cell polarity. Connect a sin-
gle-cell Li+ battery across the BATT+ and BATT-
pads of the EV kit.
Connect a 4.5V to 6.5V power supply across the
VIN and GND pads of the EV kit. The positive ter-
minal connects to the VIN pad.
Turn on the power supply to begin charging.
Verify that ACOK asserts a logic low. A logic-low
output on ACOK indicates that VIN is at the safe
range of 4.5V and 6.5V.
remains off during prequalification and fast-charge
conditions. The red LED turns off and the green
LED turns on during top-off or when the charger
times out.
Detailed Description
Quick Start
charging modes. LEDs are provided on the board to
indicate the status of the charging cycle.
The MAX1501 EV kit requires a power supply with an
output voltage of 4.5V to 6.5V for proper operation. The
MAX1501 charger is designed to handle a maximum
input voltage of 13V, but it disables charging when the
input voltage exceeds the overvoltage protection
threshold of 6.5V, or when the input voltage has not
exceeded the undervoltage lockout threshold of 4.5V.
For the 4.95V NiMH microprocessor-based charge
mode, 5.25V minimum input voltage is required.
The MAX1501 linear charger contains an internal linear
regulator available on the VL output pin. The regulator
supplies a logic-high voltage level of 3V. The VL output
pin is connected to pin 1 of all the jumpers on the EV kit
board that are used to program the operational mode of
the charger. The VL output pin is regulated to 3V when-
ever the input voltage is above 4.5V.
The maximum battery charge current is programmed
by resistor R1, which is connected between the SETI
pin and ground. The EV kit’s maximum charging current
is preset to 500mA with the 2.8kΩ resistor installed at
R1. To reconfigure the charging current, refer to the
Charge Current Selection section in the MAX1501 data
sheet to select a new value for resistor R1.
The MAX1501 EV kit provides access to timer pin TMAX
through jumper JU1. Configuring jumper JU1 allows the
user to set the maximum charge time to either 3hr,
4.5hr, or 6hr. When the maximum charge time has
elapsed, the charging cycle is terminated and the
green LED is turned on, regardless of the state of the
charging cycle. The timer and the charging cycle
restart automatically when the battery voltage drops
below 95% of the Li+ programmed regulation voltage
(4V in NiMH/NiCd mode), the input power is cycled
(turned off and turned on), or the charger is disabled
and enabled. See Table 1 for jumper JU1 configuration
to set the maximum charge time.
Table 1. Jumper JU1 (TMAX)
LOCATION
SHUNT
1 and 2
2 and 3
None
Connected to GND
Connected to VL
TMAX PIN
Floating
Fast-Charge Current
MAXIMUM CHARGE
Charge Timer
Input Source
TIME (hr)
4.5
6
3
VL