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EMC5046-84SG08NRR Schematic ( PDF Datasheet ) - Elite Semiconductor

Teilenummer EMC5046-84SG08NRR
Beschreibung Standalone Linear Li-Ion Charger
Hersteller Elite Semiconductor
Logo Elite Semiconductor Logo 




Gesamt 19 Seiten
EMC5046-84SG08NRR Datasheet, Funktion
ESMT/EMP
EMC5046
Standalone Linear Li-Ion Charger (1A, two-cell)
with Thermal Regulation
General Description
The EMC5046 is a complete linear charger for
two-cell lithium-ion batteries. With E-SOP-8 packages
and few external components, EMC5046 is well
suited for portable applications.
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 EMC5046 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 EMC5046
automatically terminates the charge cycle when
the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
The EMC5046 features 13.5V maximum rating
voltage for AC adapter, and it provides the charge
current up to 1.0A. Other features include battery
temperature monitoring, reverse current protection,
shutdown mode, charging current monitor, under
voltage lockout, automatic recharge and status
indicator.
Features
Programmable charge current up to 1.0A
No MOSFET, sense resistor or blocking diode
required
Complete linear charger in E-SOP-8 for
two-cell li-ion batteries
Thermal regulation maximizes charge rate
without risk of overheating
Preset 8.4V charge voltage with ±1%
accuracy
Automatic recharge
Charge status indicator
C/10 charge termination
5.8V trickle charge threshold
Battery reverse leakage current less than 1uA
Applications
Wireless handsets
Hand-held instruments
Portable information appliances
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jun. 2012
Revision: 0.2
1/19






EMC5046-84SG08NRR Datasheet, Funktion
ESMT/EMP
State Diagram
EMC5046
BATTERY THERMAL
FAULT
NO CHARGE CURRENT
CHG_SB: WEAK
PULL-DOWN
No Fault
POWER ON
Thermal
Fault
ISETA
reconnected
or UVLO/OVP condition
stops
BATT < 5.8V
TRICKLE CHARGE
MODE
1/10TH FULL CURRENT
CHG_BS: STRONG
PULL-DOWN
BATT > 5.8V
SHUTDOWN MODE
CHG_SB: Hi-Z in UVLO
WEAK PULL-DOWN
OTHERWISE
ISETA floated,
ISETA > 2.15V
or
UVLO/OVP
condition
CHARGE MODE
BATT > 5.8V
FULL CURRENT
CHG_SB: STRONG
PULL-DOWN
ISETA < 0.15V
STANDBY MODE
NO CHARGE CURRENT
CHG_SB: WEAK
PULL-DOWN
BATT < 5.8V
5.8V < BATT < 8.1V
FIG.2 EMC5046 charge flow chart
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jun. 2012
Revision: 0.2
6/19

6 Page









EMC5046-84SG08NRR pdf, datenblatt
ESMT/EMP
EMC5046
The EMC5046 constantly monitors the BATT pin voltage in standby mode. If this voltage drops below the 8.1V
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 EMC5046 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 VIN meets the UVLO conditions and the EMC5046 is ready to charge. High impedance indicates
that the EMC5046 is in under-voltage lockout mode: either VIN is less than 60mV of the BATT pin voltage or
insufficient voltage is applied to the IN 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 125°C. This feature protects the EMC5046 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 EMC5046. 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 VIN 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 VIN falls to within 30mV of the battery voltage. If the UVLO comparator is tripped, the charger
will not come out of shutdown mode until VIN rises 60mV above the battery voltage.
Manual Shutdown
At any point in the charge cycle, the EMC5046 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 VIN is high enough to exceed the
UVLO conditions. The CHG_SB pin is in a high impedance state if the EMC5046 is in under-voltage lockout
mode: either VIN is within 60mV of the BATT pin voltage or insufficient voltage is applied to the IN pin.
Automatic Recharge
Once the charge cycle is terminated, the EMC5046 continuously monitors the voltage on the BATT pin using a
comparator with a 150us filter time (TRECHARGE). A charge cycle restarts when the battery voltage falls below
8.1V (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
12/19

12 Page





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