The MAX1535B/MAX1535C/MAX1535D are highly integrated,
multichemistry battery chargers that simplify construction
of advanced smart chargers with a minimum
number of external components. They use Intel's system
management bus (SMBus™) to control the charge voltage,
charge current, and the maximum current drawn
from the AC adapter. High efficiency is achieved through
use of a constant off-time step-down topology with synchronous
rectification.
In addition to support of the Smart-Battery-Charger
Specifications Rev 1.1, the MAX1535B/MAX1535C/MAX1535D include additional features. The maximum
current drawn from the AC adapter is programmable to
avoid overloads when supplying the load and the battery
charger simultaneously. This enables the user to reduce
the cost of the AC adapter. The MAX1535B/MAX1535C/MAX1535D provide a digital output that indicates the
presence of an AC adapter. Based on the presence or
absence of the AC adapter, the MAX1535B/MAX1535C/MAX1535D automatically select the appropriate source
for supplying power to the system by controlling two
external p-channel MOSFETs. Under system control, the
MAX1535B/MAX1535C/MAX1535D allow the battery to
undergo a relearning or conditioning cycle in which the
battery is completely discharged through the system
load and then recharged.
The MAX1535B/MAX1535C/MAX1535D are capable of
charging 2, 3, or 4 lithium-ion (Li+) cells in series, providing
charge currents as high as 8A. The DC-DC converter
in the MAX1535B/MAX1535C/MAX1535D uses a high-side
p-channel switch with an n-channel synchronous
rectifier. The charge current and input current-limit sense
amplifiers have low input-offset errors and can use small-value
sense resistors (0.01Ω, typ).
The MAX1535B/MAX1535C/MAX1535D are available in
a 5mm x 5mm, 32-pin, thin QFN package and operate
over the extended -40°C to +85°C temperature range.
An evaluation kit is available to reduce design time.
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