MAX1538EVKIT Maxim Integrated, MAX1538EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1538EVKIT
• Description: Power Management IC Development Tools MAX1538EVKIT
• Manufacturer: Maxim Integrated
• Type: Battery Managementr
• Series: MAX1538r

Specifications of MAX1538EVKIT

• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX1538
• Input Voltage: 4.75 V to 28 V
• Output Voltage: 3.3 V
• Description/function: Evaluation kit for MAX1538
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 0.025 A
• For Use With: MAX1538

Figure 1. MAX1538 EV Kit Connection Diagram
Potentiometers (R15, R16) allow easy adjustment of the
minimum battery voltage threshold. Below this thresh-
old, the battery is considered undervoltage and is not
selected. See the Battery-Minimum Voltage Level
Adjustment section for more information on adjusting
the level.
LEDs indicate the status of the AC adapter and batter-
ies. The LEDs are driven by N-channel logic FETs.
Jumpers are provided to disable the switches, CMOS
switch debouncers, and LEDs used for evaluating
power usage.
The MAX1538 EV kit allows for adjustable AC adapter
and airline adapter trip thresholds. The airline adapter
trip threshold must be set before the AC adapter trip
threshold.
(DC SUPPLY)
(DC SUPPLY)
INPUT
Setting the Adapter Trip Thresholds
ADPIN
GND
CURRENT SENSE
RSNS+
BATTERY CHARGER
RSNS-
_______________________________________________________________________________________
OUTPUT
EXTLD
MAX1538 EV KIT
SYSTEM
TB4
GND
BATB
BATTERY B
TB3
GND
CHGIN
GND
BATA
GND
MAX1538 Evaluation Kit
To set the airline adapter trip threshold, apply the mini-
mum airline adapter voltage to the ADPIN pad and
measure the voltage at TP12. Adjust potentiometer R3
until the TP12 voltage measures 2.0V.
To set the AC adapter trip threshold, apply the mini-
mum AC adapter voltage to the ADPIN pad and mea-
sure the voltage at TP11. Adjust potentiometer R2 until
the TP11 voltage measures 2.0V.
A clockwise turn on either potentiometer increases the
measured voltage, while a counterclockwise turn on the
potentiometer decreases the measured voltage.
Charge the selected battery (see the Battery Selection
section) by moving the CHRG switch (SW1) to the up
position. Disable the charging path by moving the
switch to the down position.
The MAX1538 features battery relearning. Moving the
RELRN switch (SW2) to the up position, places the
MAX1538 into relearn mode. Moving the RELRN switch to
the down position, places the MAX1538 into normal mode.
Adjusting the BATSEL switch (SW3) selects from which
battery the EV kit powers the load. If the switch is in the
up position, battery B powers the load. If the switch is
in the down position, battery A powers the load. If the
selected battery is not present or undervoltage, that
battery is not connected to the load.
Adjusting potentiometers R16 and R15, set the mini-
mum A and B battery voltages, respectively. Turning
the potentiometer clockwise increases the minimum
battery voltage. Turning the potentiometer counter-
clockwise decreases the minimum battery voltage.
To adjust the minimum battery voltage to a predeter-
mined value, monitor the voltage at TP10/TP9 (battery
A/B). Turn the respective potentiometer until the mea-
sured voltage is equal to 1/5 the desired minimum bat-
tery voltage. The MAX1538 EV kit allows for minimum
battery thresholds between 4.65V and 13.0V.
Battery Minimum Voltage-Level
Battery Relearning
Battery Selection
Battery Charging
Adjustment
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