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PDF EUP8090 Data sheet ( Hoja de datos )
| Número de pieza | EUP8090 | |
| Descripción | 1A Linear Li-Ion/Polymer Charger IC | |
| Fabricantes | Eutech | |
| Logotipo |  |
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EUP8090
1A Linear Li-Ion/Polymer Charger IC
with Integrated FET and Charger Timer
DESCRIPTION
FEATURES
The EUP8090 series are highly integrated single cell
Li-Ion/Polymer battery charger IC designed for handheld
devices. This charger is designed to work with various
types of AC adapters capable of operating with an input
voltage as low as 2.65V.
The EUP8090 operates as a linear charger and charges the
battery in three phases: trickle current, constant current,
and constant voltage. When AC-adapter is applied, an
external resistor sets the magnitude of the charge current,
which may be programmed up to 1A with TDFN10
package and a current-limited adapter for lowest power
dissipation.
The EUP8090 features thermal regulation loop to control
charge current to keep safe operation when PCB lacked of
enough heat-sinking. A programmable charge timer
provides a backup safety for termination. The EUP8090
automatically re-starts the charge if the battery voltage
falls below an internal threshold and automatically enters
sleep mode when DC supplies are removed. No external
sense resistor or blocking diode is required for charging.
Very Low Power Dissipation
Accepts Multiple Types of Adapters Power
Integrated Power FET and Current Sensor for Up
to 1A Charge Applications
Guaranteed to Operate at 2.65V After Start-Up
Charge Termination by Minimum Current and
Time
Precharge Conditioning With Safety Timer
Reverse Leakage Protection Prevents Battery
Drainage
Charge Current Thermal Regulation
Status Outputs for LED or System Interface
Indicates Charge Conditions
Automatic Sleep Mode for Low-Power
Consumption
Available in 3mm× 3mm TDFN-10 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
Typical Application Circuit
APPLICATIONS
PDAs, Cell Phones and Smart Phones
Portable Instruments.
Stand-Alone Charger.
USB Bus Powered Charger.
DS8090 Ver 1.0 Apr. 2012
Figure 1.
1
http://www.Datasheet4U.com
1 page  
EUP8090
Electrical Characteristics (continued)
Typical values are tested at VIN = 5V and +25°C Ambient Temperature, maximum and minimum values are guaranteed
over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted.
Symbol
Parameter
Conditions
EUP8090
Min. Typ. Max.
Unit
RECHARGE THRESHOLD
VRECHRG Recharge Voltage Threshold
- 4.0 -
V
TRICKLE CHARGE THRESHOLD
VMIN
Trickle Charge Threshold
Voltage
OSCILLATOR
2.7 2.85 3
V
TOSC
Oscillation Period
CTIME = 15nF
2.4 3 3.6 ms
LOGIC INPUT AND OUTPUT
STATUS Sink Current
Pin Voltage = 0.8V
5 - - mA
(1)
I O(OUT)
=
105 × 0.8V
R IREF
(2)
I O( PRECHG )
=
104 × 0.8V
R IREF
(3)
I O( EOC)
=
10
4 × 0.8V
R IREF
DS8090 Ver 1.0 Apr. 2012
5
5 Page 
Battery Charge Current
The EUP8090 offers on-chip current regulation with
programmable set point. The resistor connected between
the IREF and GND, RIREF, determines the AC charge
rate.
There is ways to program the charge current:
using the RIREF as shown in the Typical Applications.
The voltage of IREF is regulated to a 0.8V reference
voltage when not driven by any external source. The
charging current during the constant current mode is
100,000 times that of the current in the RIREF resistor.
Hence, depending on how IREF pin is used, the charge
current is,
EUP8090
IREF =
0.8V
× 105 (A)
R IREF
R IREF
(4)
Battery Voltage Regulation
The voltage regulation feedback is through the VBAT pin.
This input is tied directly to the positive side of the
battery pack. The EUP8090 monitors the battery pack
voltage between the VBAT and GND pins. When the
battery voltage rises to VO(REG) threshold, the voltage
regulation phase begins and the charging current begins
to taper down.
As a safety backup, the EUP8090 also monitors the
charge time in the charge mode. If charge is not
terminated within this time period, TIMEOUT, the
EUP8090 turns off the charger.
End-of-Charge (EOC) Current
The end-of-charge current C/10 sets the level at which
the charger starts to indicate the end of the charge with
the STATUS pin, as shown in Figure 21. The charger
actually does not terminate charging until the end of the
TIMEOUT, as described in the Total Charge Time
section.
Recharge
After End-of-charge, the EUP8090 re-starts the charge
once the voltage on the VBAT pin falls below the V(RCH)
threshold. This feature keeps the battery at full capacity
at all times.
Power on Reset (POR)
Figure 21. Operation Waveforms
The following events initiate a new charge cycle:
• POR,
• the battery voltage drops below a recharge threshold
after completing a charge cycle,
• or, the EN pin is toggled from GND to floating.
Sleep Mode
The EUP8090 enters the low-power sleep mode if
AC-adapter is removed from the circuit. This feature
prevents draining the battery during the absence of input
supply.
Internal Timer
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external
timing capacitor, CTIME. The oscillator charges the timing
capacitor to 1.5V and then discharges it to 0.5V in one
period, both with 10µA current. The period TOSC is:
TOSC = 0.2 × 10 6 × CTIME (seconds)
(5)
A 15nF capacitor results in a 3ms oscillation period. The
accuracy of the period is mainly dependent on the
accuracy of the capacitance and the internal current
source. The total charge time for the CC mode and CV
mode is limited can be calculated as:
TIMEOUT
=
222
× TOSC
= 14 ×
CTIME
1nF
(minutes)(6)
The EUP8090 resets itself as the input voltage rises
above the POR rising threshold. The V2P8 pin outputs a
2.8V voltage, the internal oscillator starts to oscillate, the
internal timer is reset, and the charger begins to charge
the battery.
The EUP8090 has a typical rising POR threshold of 3.4V
and a falling POR threshold of 2.4V.
Signals in a charge cycle are illustrated in Figure 21.
For example, a 15nF capacitor sets the TIMEOUT to be
3.5 hours. The charger has to reach the end-of-charge
condition before the TIMEOUT, otherwise, a TIMEOUT
fault is issued. The TIMEOUT fault latches up the
charger. There are two ways to release such a latch-up:
either to recycle the input power, or toggle the EN pin to
disable the charger and then enable it again.
The trickle mode charge has a time limit of 1/8
TIMEOUT. If the battery voltage does not reach VMIN
within this limit, a TIMEOUT fault is issued and the
charger latches up.
DS8090 Ver 1.0 Apr. 2012
11
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| PDF Descargar | [ Datasheet EUP8090.PDF ] | |
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