DS8054  Ver1.1  Jan. 2007
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DESCRIPTION
The EUP8054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the EUP8054 ideally suited for portable applications.
Furthermore, the EUP8054 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 EUP8054 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 EUP8054 automatically enters a low current state, dropping the battery drain current to less than 2µA. The EUP8054 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.
FEATURES
z  Programmable Charge Current Up to 800mA  z
No MOSFET, Sense Resistor or Blocking Diode
Required z  Complete Linear Charger in ThinSOT Package for
Single Cell Lithium-ion Batteries z  Constant-Current/Constant-V oltage Operation with
Thermal Regulation to Maximize Charge Rate Without Risk of Overheating z  Charges Single Cell Li-Ion Batteries Directly from
float up
USB Port z  Preset 4.2V Charge V oltage with ±1% Accuracy z  Charge Current Monitor Output for Gas Gauging z  Automatic Recharge
z  Charge Status Output Pin z  C/10 Charge Termination
z  25µA Supply Current in Shutdown
z    2.9V Trickle Charge Threshold (EUP8054)
z  Available Without Trickle Charge (EUP8054X)  z  Soft-Start Limits Inrush Current
z  Available in TSOT-25, TDFN-6(3mm*3mm) Package z  RoHS Compliant and 100% Lead (Pb)-Free  APPLICATIONS z  Cellular Telephones/ PDAs/ MP3 Players z  Charging Docks and CradIes z  Bluetooth Applications
EUP8054/8054X Typical Application Circuit
Figure 1. 600mA Single Cell Li-ion Charger Figure 2. USB/Wall Adapter Power Li-Ion Charger
Figure 3. Full Featured Single Cell Li-Ion Charger Figure 4. 800mA Li-Ion Charger with External
Power Dissipation
EUP8054/8054X
Pin Configurations
Package Type Pin  Configurations
TSOT-25
TDFN-6
Pin Description
Pin Functions
CHRG :Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 12µA is connected to the CHRG pin, indicating a “AC present” condition. When the EUP8054 detects an undervoltage lockout condition, CHRG is forced high impedance.
GND : Ground.
BAT : Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V . An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode.
V CC  : Positive Input Supply V oltage. Provides power to the charger. V CC can range from 4.35V to 6.5V and should be bypassed with at least a 1µF capacitor. When V  drops to within 30mV of the BAT pin voltage, the
EUP8054/8054X
DS8054  Ver1.1  Jan. 2007
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Pin Functions (continue)
PROG: Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, R PROG , to ground. When charging in constant-current mode, this pin servos to 1V . In all modes, the voltage on this pin can be used to measure the charge current using the following formula: ()
1000PROG R /PROG V BAT I •=
The PROG pin can also be used to shutdown the charger. Disconnecting the program resistor from ground allows a 3µA current to pull the PROG pin high. When it reaches the 1.94V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25µA. This pin is also clamped to approximately 2.4V . Driving this pin to voltages beyond the clamp voltage will draw currents as high as1.5mA. Reconnecting R PROG  to ground will return the charger to normal operation. N/C: No connection.
Ordering Information
Order Number Package Type Marking Operating Temperature range
EUP8054OIR1 TSOT-25 UNxx -20 °C to 70°C EUP8054XOIR1
TSOT-25
UXxx -20 °C to 70°C EUP8054RIR1 TDFN-6
xxxx 8054N
-20 °C to 70°C
EUP8054/X
Lead Free Code
1: Lead Free  0: Lead
Packing
R:
Tape& Reel
Operating temperature range
I: Industry Standard                                Package Type                                  O: TSOT  R:TDFN
Absolute Maximum Ratings
Input Supply voltage, (Vcc) ------------------------------------------------------------------------- -0.3 to +6.5V  PROG ------------------------------------------------------------------------------------------- -0.3V to V CC +0.3V  BAT -----------------------------------------------------------------------------------------------------  -0.3 to +6.5V  CHRG--------------------------------------------------------------------------------------------------  -0.3 to +6.5V  BAT Short-Circuit Duration -------------------------------------------------------------------------- Continuous  BAT Pin Current ---------------------------------------------------------------------------------------------  800mA  PROG Pin Current -------------------------------------------------------------------------------------------  800µA  Maximum Junction Temperature,  ------------------------------------------------------------------------  125°C  Operating Ambient Temperature Range (Note 2) -----------------------------------------------  -40°C to 85°C  Storage Temperature Range  ------------------------------------------------------------------------65°C to 125°C  Lead Temperature (soldering, 10s) ----------------------------------------------------------------------- 300°C
Electrical Characteristics over Recommended Operating Free-Air Temperature Range
DS8054  Ver1.1  Jan. 2007
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Electrical Characteristics Over Recommended Operating Free-Air Temperature Range
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.
Note 2: The EUP8054 are guaranteed to meet performance specifications from 0¢J to 70¢J. Specifications over the -40¢J to 85¢J operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: See Thermal Considerations.
Note 4: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery through the BAT pin (approximately 100mA).
Note 5: This parameter is not applicable to the EUP8054X.
Note 6: I TERM is expressed as a fraction of measured full charge current with indicated PROG resistor.
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