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PDF EMC5042-84FF10NRR Data sheet ( Hoja de datos )
| Número de pieza | EMC5042-84FF10NRR | |
| Descripción | Standalone Linear Li-Ion Charger | |
| Fabricantes | Elite Semiconductor | |
| Logotipo |  |
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ESMT/EMP
EMC5042
Standalone Linear Li-Ion Charger (two-cell)
with Thermal Regulation
General Description
The EMC5042 is a complete linear charger for
two-cell lithium-ion batteries. With small TDFN-10
package and few external components, EMC5042 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 EMC5042 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 EMC5042
automatically terminates the charge cycle when
the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
The EMC5042 features 13.5V 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 TDFN-10 for
two-cell li-ion batteries
g Thermal regulation maximizes charge rate
without risk of overheating
g Thermistor input for temperature qualified
charging
g Preset 8.4V charge voltage with ±1%
accuracy
g Automatic recharge
g Charge status indicator
g C/10 charge termination
g 5.8V trickle charge threshold
g Battery reverse leakage current less than 1uA
Applications
g Wireless handsets
g Hand-held instruments
g Portable information appliances
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jul. 2012
Revision: 1.1
1/20
1 page  
ESMT/EMP
Functional Block Diagram
EMC5042
IN
CHG_SB
ACIN
BAT
Body
Switch
BS BS
Regulation
Controller
-+
BS
BATT
PGOODB
GND
-+
1.2V
5.8V
BAT
Temperature
Controller
1.5V
0.15V
UVLO/OVP
BAT
8.1V
Logic
Controller
0.15V
Disable
COLD
2.15V
2.5V
HOT
0.5V
ISETA
ENB
TS
FIG.1 Functional Block Diagram of EMC5042
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jul. 2012
Revision: 1.1
5/20
5 Page 
ESMT/EMP
EMC5042
Operation
The EMC5042 is a two-cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It
can deliver up to 1.2A of charge current (using a good thermal PCB layout) with a final float voltage accuracy
of ±1%. The EMC5042 includes an internal P-channel power MOSFET and thermal regulation circuitry. No
blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two
external components.
Normal Charge Cycle
A charge cycle begins when the voltage at the IN pin rises above the UVLO threshold level and a 1% program
resistor is connected from the ISETA pin to ground or when a battery is connected to the charger output. If the
BATT pin is less than 5.8V, the charger enters trickle charge mode. In this mode, the EMC5042 supplies
approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for full
current charging. When the BATT pin voltage rises above 5.8V, the charger enters constant-current mode,
where the programmed charge current is supplied to the battery. When the BATT pin approaches the final
float voltage (8.4V), the EMC5042 enters constant- voltage mode and the charge current begins to decrease.
When the charge current drops to 1/10 of the programmed value, the charge cycle ends.
Programming Charge Current
The charge current is programmed using a single resistor from the ISETA pin to ground. The battery charge
current is 500 times the current out of the ISETA pin. VSET is 1.5V when charging in constant-current mode. The
program resistor and the charge current are calculated using the following equations:
R SET
=
500V SET
I CHG
,
I CHG
=
500V SET
R SET
The charge current out of the BATT pin can be determined at any time by monitoring the ISETA pin voltage
using the following equation:
IBATT
=
VSET
RSET
× 500
Charge Termination
A charge cycle is terminated when the charge current falls to 1/10th the programmed value after the final
float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the
ISETA pin. When the ISETA pin voltage falls below 150mV for longer than TTERM (typically 1ms), charging is
terminated. The charge current is latched off and the EMC5042 enters standby mode, where the input supply
current drops to 150uA. (Note: C/10 termination is disabled in trickle charging and thermal limiting modes). The
EMC5042 draws no current from the battery in standby mode. This feature reduces the charge and discharge
cycles on the battery, further prolonging the battery life.
Any external source (VSET) that holds the ISETA pin above 150mV will prevent the EMC5042 from terminating a
charge cycle. However, if the ISETA pin is controlled by external source, current sourcing from the BATT pin can
be infinity (until the internal power MOSFET is burned out or the BATT pin voltage is close to its final float voltage),
and the formula for charge current is not valid anymore.
When charging, transient loads on the BATT pin can cause the ISETA pin to fall below 150mV for short periods of
time before the DC charge current has dropped to 1/10th the programmed value. The 1ms filter time (TTERM) on
the termination comparator ensures that transient loads of this nature do not result in premature charge cycle
termination. Once the average charge current drops below 1/10th the programmed value, the EMC5042
terminates the charge cycle and ceases to provide any current through the BATT pin. This is the standby mode,
and all loads on the BATT pin must be supplied by the battery. In the standby mode, any signal below the
manual shutdown threshold voltage (typically 2.15V) on the ISETA pin is transparent to EMC5042.
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jul. 2012
Revision: 1.1
11/20
11 Page | ||
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