IA IA4054 Schematic [ru]

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Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking

Diode Required

Complete Linear Charger in ThinSOTTM

Package for
Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage

Operation with
Thermal Regulation* to Maximize Charge

Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V Charge Voltage with 1%

Accuracy
Automatic Recharge
60uA Supply Current in Shutdown

2.9V Trickle Charge Threshold
Two sides of LED showing
Available in 6-Lead SOT-23 Package

Charger for Li-Ion Coin Cell Batteries
Portable MP3 Players, Wireless Headsets
Bluetooth Applications
Multifunction Wristwatches

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The IA4054 is a complete constant - cu r ren t / co
nstantvoltage linear charger for single cell lithi

um-ion batteries. Its ThinSOT package and lo
w external component coun t make the IA4054
3 ideally suited for portable applications. Furth
ermore, the IA4054 is specifi cal ly designed
to work within USB power specificat ions.
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
IA4054 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 IA4054 automatically
enters a low current state, dropping the battery
drain current to less than 1uA. The IA4054 can
be put into shutdown mode, reducing the supply
current to 60uA. 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 IA4054 converters are available i n the
industry standard SOT-23-6 power
packages (or upon request).

HX1001

II2I

IA4054

1

IA4054

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IA4054

SYMBOL DESCRIPTION

①

②

① ②

:

Denotes Output voltage:

4.2V
Denotes Package Types:
E: SOT-23-6

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2

IA4054

PPiinn AAssssiiggnnmmeenntt

6 5 4

1 2 3

PIN

NUMBER

SOT-23- 6

1 CHRG

2 GND

3 BAT

4 PROG

5 LD

6 VCC

PIN NAME FUNCTION

Open-Drain Charge
Status Output
Ground

Charge Current
Output
Positive Input
Supply Voltage.
Open-Drain Charge
Status Output

Charge Current
Program, Charge
Current Monitor and
Shutdown Pin

Absolout Maximum Ratings

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Input Supply Voltage (VCC) ......................................................................................... –0.3V to 10V

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PROG............................................................................................................... – 0.3V to VCC + 03V

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BAT .......................................................................................................................... –0.3V to 8V

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CHRG..................................................................................................................... –0.3V to 10V

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BAT Short-Circuit Duration ............................................................................................. Continuous

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BAT Pin Current .................................................................................................................... 800mA

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PROG Pin Current ................................................................................................................ 800uA

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Maximum Junction Temperature .............................................................................. 125

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Operating Ambient Temperature Range............................................................... –40℃ to 85℃

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Storage Temperature Range ………………………………………….................. –65 ℃to 125℃

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Lead Temperature (Soldering, 10 sec).................................................................................. 300℃

℃

3