Page 1
ESMT/EMP
EMC5040
Standalone Linear Li-Ion Charger with
Thermal Regulation
General Description
The EMC5040 is a complete linear charger for single
cell lithium-ion batteries. With small TDFN-10
package and few external components, EMC5040 is
well suited for portable applications. In addition, the
EMC5040 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 EMC5040 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 EMC5040
automatically terminates the charge cycle when
the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
The EMC5040 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 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
Applications
g Wireless handsets
g Hand-held instruments
g Portable information appliances
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011
Revision: 1.1 1/19
Page 2
ESMT/EMP
EMC5040
Typical Application Circuit
3.7V Li-Ion
EMC5040
Battery Pack
ACIN =
4.5V~13.5V
1k
1uF
Complete Charger Cycle
V
BAT
2.9V
Precharge
Threshold
I
BAT
V
Ise t
1k
ACIN
CHG_SB
PGOODB
GND
BATT
TS
ENB
ISETA
Programmed Charge Current
1
1uF
RSET
1uF
4.05V
Recharg e
Threshold
1/10 Programmed
Charge Current
Fast Charg e
Fast Ch arg e
Phase
Phase
Constant Voltage
Phase
Standby
Phase
Re-charge
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011
Revision: 1.1 2/19
Phase
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ESMT/EMP
EMC5040
Connection Diagrams
Order information
EMC5040-42FF10NRR
42 Output voltage
FF10 TDFN-10 Package
NRR RoHS & Halogen free package
Rating: -40 to 85°C
Package in Tape & Reel
Top View
Order, Marking & Packing Information
Package Product ID. Marking Packing
10 9 78 6
TDFN-10 EMC5040-42FF10NRR
PIN1 DOT
EMP
EMC5040
Tracking Code
1 2 43 5
Tape & Reel
5Kpcs
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011
Revision: 1.1 3/19
Page 4
ESMT/EMP
to
EMC5040
Pin Functions
Name TDFN-10 Function
Positive Input Supply Voltage. Provides power to the charger. ACIN can range from 4.5V
ACIN 1
to 6.5V and should be bypassed with at least a 1μF capacitor. When ACIN drops to within
30mV above the BATT pin voltage, the EMC5040 enters shutdown mode, dropping I
less than 1μA.
BATT
NC 2
CHG_SB
PGOODB 4
GND 5
ISETA 6
3
Not connected.
Open-Drain Charge Status Output. An internal N-channel MOSFET connects CHG_SB pin
to ground when the battery is charging. After the charge cycle is completed, the internal
N-channel MOSFET is replaced by a weak pull-down of approximately 25μA, indicating an
“AC present” condition. When the EMC5040 detects an under voltage lockout condition,
CHG_SB is forced high impedance.
Open-Drain Battery Power Good Output. An internal N-channel MOSFET connects
PGOODB pin to ground when ACIN is over 4.2V. PGOODB is forced low during normal
operation.
Ground.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current
is programmed by connecting a 1% resistor, R
constant-current mode, this pin servos to 1.5V. In all modes, the voltage on this pin can be
used to measure the charge current using the following formula:
= (V
I
BATT
The ISETA pin can also be used to shutdown the charger. Disconnecting the program
resistor from ground allows a 1μA current to pull the ISETA pin high. When it reaches the
2.15V shutdown threshold voltage, the charger enters shutdown mode. This pin is also
clamped to approximately 2.5V. Reconnecting R
normal operation.
The ISETA pin must not be directly shorted to ground at any condition.
SET
/ R
, to ground. When charging in
SET
) * 500
SET
to ground will return the charger to
SET
NC 7
ENB 8
TS 9
BATT 10
Not connected.
Charge Enable Input (active low). This pin is weakly pulled low internally.
TS pin is the input for an external NTC thermistor. When the TS pin voltage is out of the
window, determined by the V
fault condition.
Charge Current Output and battery voltage feedback. This pin provides charge current
to the battery and regulates the final float voltage to 4.2V. An internal precision resistor
divider from this pin sets the float voltage which is disconnected in shutdown mode.
TMIN
and V
, the EMC5040 stops charging and indicates a
TMAX
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011
Revision: 1.1 4/19
Page 5
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