|
|
PDF EMC5045-42SG08NRR Data sheet ( Hoja de datos )
| Número de pieza | EMC5045-42SG08NRR | |
| Descripción | Standalone Linear Li-Ion Charger | |
| Fabricantes | Elite Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de EMC5045-42SG08NRR (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
ESMT/EMP
Preliminary
EMC5045
Standalone Linear Li-Ion Charger with
Thermal Regulation
General Description
The EMC5045 is a complete linear charger for single
cell lithium-ion batteries. With E-SOP-8 packages and
few external components, EMC5045 is well suited for
portable applications. In addition, the EMC5045 is
specifically designed to work within USB power
specifications.
No external sense resistor and blocking diode are
required. Charging current can be programmed
externally with a single resistor. The built-in thermal
regulation facilitates charging with maximum power
without risk of overheating.
The EMC5045 always preconditions the battery with
1/10 of the programmed charge current at the
beginning of a charge cycle, after it verifies that the
battery can be fast-charged. The EMC5045
automatically terminates the charge cycle when
the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
The EMC5045 features 6.5V maximum rating voltage
for AC adapter, and it provides the charge current
up to 1.2A. Other features include battery
temperature monitoring, reverse current protection,
shutdown mode, charging current monitor, under
voltage lockout, automatic recharge and status
indicator.
Features
g Programmable charge current up to 1.2A
g No MOSFET, sense resistor or blocking diode
required
g Complete linear charger in E-SOP-8 for single
cell li-ion batteries
g Thermal regulation maximizes charge rate
without risk of overheating
g Thermistor input for temperature qualified
charging
g Charges single cell Li-ion batteries directly
from USB port.
g Preset 4.2V charge voltage with ±1%
accuracy
g Automatic recharge
g Charge status indicator
g C/10 charge termination
g Battery reverse leakage current less than 1uA
g Over voltage protection up to 13.5V
Applications
g Wireless handsets
g Hand-held instruments
g Portable information appliances
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jun. 2012
Revision: 0.2
1/19
1 page  
ESMT/EMP
Functional Block Diagram
Preliminary
EMC5045
ACIN
CHG_SB
PGOODB
GND
ACIN
BAT
2.9V
BAT
Body
Switch
BS BS
Regulation
Controller
-+
Temperature
Controller
1.5V
0.15V
UVLO/OVP
BAT
4.05V
Logic
Controller
0.15V
2.15V
-+
BS
BATT
1.2V
ISETA
Disable
ENB
FIG.1. Functional Block Diagram of EMC5045
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jun. 2012
Revision: 0.2
5/19
5 Page 
ESMT/EMP
Preliminary
EMC5045
The EMC5045 constantly monitors the BATT pin voltage in standby mode. If this voltage drops below the 4.05V
recharge threshold (VRECHRG), another charge cycle begins and current is once again supplied to the battery.
To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied,
or the charger must be shut down and restarted using the ISETA pin.
Charge Status Indicator (CHG_SB)
The charge status output has three different states: strong pull-down (~10mA), weak pull-down (~25uA) and
high impedance. The strong pull-down state indicates that the EMC5045 is in a charge cycle. Once the charge
cycle has terminated, the pin state is determined by under-voltage lockout conditions. A weak pull-down
indicates that ACIN meets the UVLO conditions and the EMC5045 is ready to charge. High impedance
indicates that the EMC5045 is in under-voltage lockout mode: either VIN is less than 60mV above the BATT pin
voltage or insufficient voltage is applied to the ACIN pin. A microprocessor can be used to distinguish between
these three states. This method is discussed in the Applications Information section.
Thermal Limiting
An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts
to rise above a preset value of approximately 120°C. This feature protects the EMC5045 from excessive
temperature and allows the user to push the limits of the power handling capability of a given circuit board
without risk of damaging the EMC5045. The charge current can be set according to typical (not worst-case)
ambient temperature with the assurance that the charger will automatically reduce the current in worst-case
conditions. E-SOP-8 power considerations are discussed further in the Applications Information section.
Under-voltage Lockout (UVLO)
An internal under-voltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode
until ACIN rises above the under-voltage lockout threshold. The UVLO circuit has a built-in hysteresis of 150mV.
Furthermore, to protect against reverse current in the power MOSFET, the UVLO circuit keeps the charger in
shutdown mode if ACIN falls to within 30mV of the battery voltage. If the UVLO comparator is tripped, the
charger will not come out of shutdown mode until ACIN rises 60mV above the battery voltage.
Manual Shutdown
At any point in the charge cycle, the EMC5045 can be put into shutdown mode by removing RSET thus floating
the ISETA pin. This reduces the battery drain current to about to 0uA and the supply current to less than 150uA.
A new charge cycle can be initiated by reconnecting the program resistor.
In manual shutdown, the CHG_SB pin is in a weak pull- down state as long as ACIN is high enough to exceed
the UVLO conditions. The CHG_SB pin is in a high impedance state if the EMC5045 is in under-voltage lockout
mode: either ACIN is within 60mV of the BATT pin voltage or insufficient voltage is applied to the ACIN pin.
Automatic Recharge
Once the charge cycle is terminated, the EMC5045 continuously monitors the voltage on the BATT pin using a
comparator with a 2ms filter time (TRECHARGE). A charge cycle restarts when the battery voltage falls below 4.05V
(which corresponds to approximately 80% to 90% battery capacity). This ensures that the battery is kept at or
near a fully charged condition and eliminates the need for periodic charge cycle initiations. CHG_SB output
enters a strong pull-down state during recharge cycles.
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jun. 2012
Revision: 0.2
11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet EMC5045-42SG08NRR.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| EMC5045-42SG08NRR | Standalone Linear Li-Ion Charger | Elite Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |