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PDF EUP8051A Data sheet ( Hoja de datos )
| Número de pieza | EUP8051A | |
| Descripción | Low Cost 1A Linear Battery Charge Controllers | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUP8051A
Low Cost 1A Linear Battery Charge
Controllers
DESCRIPTION
The EUP8051A is a single Lithium-Ion (Li-Ion) and
Lithium–Polymer (Li-Pol) linear charge management
controller for use in cost sensitive and portable
applications. It combines high accuracy constant-current
and constant-voltage regulation, cell preconditioning,
temperature monitoring, automatic charge termination,
charge-status indication, in a space-saving MSOP-8
package.
The EUP8051A applies a constant current up to 1A to the
battery and the charge current can be programmed
externally with a sense-resistor.
The EUP8051A automatically terminates the charge cycle
when the charge current drops to the charge termination
threshold (ITERM) after the charge-regulation voltage is
reached.
When the input supply is removed, the EUP8051A
automatically enters a low-power sleep mode, dropping
the battery drain current to less than 1µA.
A battery charge state output pin is provided to indicate
battery charge status through a display LED. The battery
charge status output is a serial interface which may also be
read by a system microcontroller.
FEATURES
z Programmable Charge Current up to 1A
z 4.5V-7V Input Voltage Range
z Ideal for Single Cell (4.2V) Li-Ion or Li-Pol
Batteries
z Preset Charge Voltage with ±1% Accuracy
z Constant-Current/Constant Voltage Operation
z Preconditioning of Low Voltage Cells
z Optional Cell-Temperature Monitoring Before and
During Charge
z Charge Status Indication
z Automatic Battery Recharge
z Charge Termination by Minimum Current
z Automatic Low-Power Sleep Mode When Input
Power is Removed
z Available in MSOP-8 Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Cellular Phones / PDAs/ MP3 Players/DSC
z Handheld Instruments
DS8051A Ver 1.1 Nov. 2006
1
1 page  
EUP8051ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Absolute Maximum Ratings
Supply voltage, (Vcc with respect to GND) ------------------------------------------------------ -0.3 to +10V
Input voltage, SNS, BAT, TS, PI (all with respect to GND)-------------------------- -0.3V to VCC +0.3V
Sink current (STAT pin) not to exceed PD -------------------------------------------------------------- 20mA
Source current (STAT pin) not to exceed PD ---------------------------------------------------------- 10mA
Output current (CC pin) not to exceed PD -------------------------------------------------------------- 40mA
Maximum Junction Temperature, TJ ------------------------------------------------------------------- 150°C
Storage temperature range, Tstg ------------------------------------------------------------- -65°C to 150°C
Lead temperature (soldering, 10s) ------------------------------------------------------------------ 300°C
Package Thermal Resistance, θJA- MSOP8 ---------------------------------------------------------- 80°C/W
Recommended Operating Conditions
Supply voltage, VCC
Operating free-air temperature range, TA
Min.
4.5
-20
Max.
7
70
Unit
V
°C
Electrical Characteristics over Recommended Operating Free-Air Temperature Range
Symbol
I(VCC)
Parameter
VCC current
Conditions
VCC=5V >VCC(min), Excluding
external loads
EUP8051A
Min. Typ. Max.
0.5 1
I(VCCS)
VCC Sleep current
V(BAT) ≥ V(min),
V(BAT)-VCC ≥ 0.8V
6
Unit
mA
µA
IIB(BAT) Input bias current on BAT pin
IIB(SNS) Input bias current on SNS pin
IIB(TS) Input bias current on TS pin
IIB(PI) Input bias current on PI pin
Battery Voltage Regulation
VO(REG)
Output voltage
V(BAT)=V(REG)
V(SNS)=5V
V(TS)=5V
V(PI)=5V
EUP8051A-4.2
1 µA
1 µA
1 µA
1 µA
4.158 4.20 4.242 V
DS8051A Ver 1.1 Nov. 2006
5
5 Page 
EUP8051ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Qualification and Precharge
When power is applied, the EUP8051A starts a
charge-cycle if a battery is already present or when a
battery is inserted. Charge qualification is based on
battery temperature and voltage.
The EUP8051A suspends charge if the battery
temperature is outside the V(TS1) to V(TS2) range and
suspends charge until the battery temperature is within
the allowed range. The EUP8051A also checks the
battery voltage. If the battery voltage is below the
precharge threshold V(min), the EUP8051A uses
precharge to condition the battery. The conditioning
charge rate I(PRECHG) is set at approximately 10% of the
regulation current. The conditioning current also
minimizes heat dissipation in the external pass-element
during the initial stage of charge. See Figure5 for a
typical charge-profile.
Voltage Regulation Phase
The voltage regulation feedback is through the BAT pin.
This input is tied directly to the positive side of the
battery pack. The EUP8051A monitors the battery-pack
voltage between the BAT and VSS pins. The EUP8051A
is offered in two fixed-voltage versions:4.2V.
FB/CE Pin Function
This pin has two functions, one is to enable/disable the
charge function, and the other is to finely adjust battery
regulation voltage. Connect this pin to VDD to enable
EUP8051A, and connect to ground to disable it (Figure7).
If this pin is connected to a voltage divider as shown in
Figure8, it can be a 2.15V reference voltage to adjust the
output regulation voltage as desired.
Current Regulation Phase
The EUP8051A regulates current while the battery-pack
voltage is less than the regulation voltage, VO(REG). The
EUP8051A monitors charge current at the SNS input by
the voltage drop across a sense-resistor, RSNS, in series
with the battery pack. In current sensing configuration
(Figure6), RSNS is between the VCC and SNS pins,
charge-current feedback, applied through pin SNS,
maintains a voltage of V(SNS) across the current sense
resistor. The following formula calculates the value of the
sense resistor:
R SNS
=
V(SNS)
I O(REG)
---------------------------- (1)
Where IO(REG) is the desired charging current.
Example: For 0.55A, RSNS: 0.22V/0.55A: 0.4Ω
For 1.0A, RSNS: 0.22V/1.0A: 0.22Ω
DS8051A Ver 1.1 Nov. 2006
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet EUP8051A.PDF ] | |
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