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19-3923; Rev 0; 1/06

                    KIT
              ATION
         EVALU
           AVA ILABLE

                        SMBus Level 2 Battery Charger with
                                            Remote Sense
                                      General Description                                                                                 Features




                                                                                                                                                                       MAX8731
The MAX8731 is an SMBusTM programmable multichem-                                          0.5% Battery Voltage Accuracy
istry battery charger. The MAX8731 uses a minimal                                          3% Input Current-Limit Accuracy
command set to easily program the charge voltage,
charge current, and adapter current limit.                                                 3% Charge-Current Accuracy
                                                                                           SMBus 2-Wire Serial Interface
The MAX8731 charges one to four Li+ series cells and
delivers up to 8A charge current. The MAX8731 drives                                       Cycle-by-Cycle Current Limit
n-channel MOSFETs for improved efficiency and                                                 Battery Short-Circuit Protection
reduced cost. Low-offset current-sense amplifiers pro-                                        Fast Response for Pulse Charging
vide high accuracy with 10m sense resistors.                                                  Fast System-Load-Transient Response
The MAX8731 current-sense amplifiers provide high                                          Dual-Remote-Sense Inputs
accuracy (3% at 3.5A) and also provide fast cycle-by-
cycle current-mode control to protect against battery                                      Monitor Outputs for
short circuit and system load transients.                                                     Adapter Current (4% Accuracy)
The charger employs dual remote-sense, which reduces                                          AC Adapter Detection
charge time by measuring the feedback voltage directly                                     11-Bit Battery Voltage Setting
at the battery, improving accuracy of initial transition into                              6-Bit Charge-Current/Input-Current Setting
constant-voltage mode. The MAX8731 provides 0.5%                                           8A (max) Battery Charger Current
battery voltage accuracy directly at the battery terminal.
                                                                                           11A (max) Input Current
The MAX8731 provides a digital output that indicates the
presence of the AC adapter, as well as an analog output                                    +8V to +26V Input Voltage Range
that indicates the adapter current within 4% accuracy.                                     Charges Li+, NiMH, and NiCd Battery Chemistries
The MAX8731 is available in a small 5mm x 5mm,
28-pin, thin (0.8mm) QFN package. An evaluation kit is                                                              Ordering Information
available to reduce design time. The MAX8731 is avail-                                       PART       TEMP RANGE           PIN-PACKAGE
able in lead-free packages.
                                                                                        MAX8731ETI+ -40

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