CYT5026
Standalone Linear Li-lon Battery Charger
Features
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Programmable Charge Current Up to 800mA.
programmed value after the final float voltage is
reached.
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No MOSFET, Sense Resistor or Blocking
Diode Required.
Constant-Current/Constant-Voltage Operation
When the input supply (wall adapter or USB
supply) is removed, the CYT5026 automatically
enters a low current stage, dropping the battery
drain current to less than 2uA. The CYT5026 can
be put into shutdown mode, reducing the supply
current to 25uA.
■
with Thermal Protection to Maximize Charge
Rate without Risk of Overheating.
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Charges Single Cell Li-Ion Batteries Directly
from USB Port.
Preset 4.2V Charge Voltage with ±1%
Accuracy.
■
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.
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■
■
■
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25uA Supply Current in Shutdown.
2.9V Trickle Charge Threshold
Available Without Trickle Charge.
Soft-Start Limits Inrush Current.
Available in 5-Lead SOT-23 Package.
Description
Pin Configuration
CYT5026 is a complete constant-current &
constant voltage linear charger for single cell
lithium-ion batteries. Its SOT package and low
external component count make CYT5026 ideally
suited for portable applications. Furthermore, the
CYT5026 is specifically designed to work within
USB power pecification. At the same time,
CYT5026 can also be used in the standalone
lithium-ion battery charger.
1.CHRG
2.GND
3.BAT
4.VCC
5.PROG
SOT-23-5
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
Applications
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Cellular Telephones, PDA’s, MP3 Players.
Charging Docks and Cradles
Bluetooth Applications
programmed externally with a single resistor. The
CYT5026 automatically terminates the charge
cycle when the charge current drops to 1/10th the
ShenZhen CYT IC Design CO ,Ltd
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