The SGM4054 is a complete constant-current/constantvoltage
linear charger for single cell lithium-ion batteries.
Its SOT23-5 small package and low external component
count make the SGM4054 ideally suited for portable
applications. Besides wall adapter’s 5V power supply,
the SGM4054 is specifically designed to work within USB
power specifications.
SGM4054 is high integrated charger, there is no external
current sense resistor and MOSFET, 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
SGM4054 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 SGM4054 automatically enters a low
current state, dropping the battery drain current to less
than 3μA. The SGM4054 can be put into shutdown mode,
reducing the supply current to 25μA.
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. SGM4054YN5/TR资料下载
