The HX6001 is a complete
constant-current/constantvoltage linear
charger for single cell lithium-ion batteries.
Its ThinSOT package and low external
component count make the HX6001 ideally
suited for portable applications.
Furthermore, the HX6001 is specifically
designed to work within USB power
specifications.
No external sense resistor is needed, and no
blocking diode is required due to the
internal MOSFET architecture. Thermal
feedback regulates the charge current to
limit the die temperature during high power
operation or high ambient temperature. The
charge voltage is fixed at 4.2V, and the
charge current can be programmed
externally with a single resistor. The HX6001
automatically terminates the charge cycle
when the charge current drops to 1/10th the
programmed value after the final float
voltage is reached.
When the input supply (wall adapter or USB
supply) is removed, the HX6001
automatically enters a low current state,
dropping the battery drain current to less
than 2 A. The HX6001 can be put into
shutdown mode, reducing the supply
current to 25 A.
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Other features include
charge current monitor, undervoltage
lockout, automatic recharge and a status pin
to indicate charge termination and the
presence of an input voltage.
The HX6001 converters are available in
the industry standard SOT-23-5 power
packages (or upon request).

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