Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010
Standalone 1.2A Linear Li-Ion Battery Charger with Thermal Regulation in TDFN-6
General Description
The EMC5755 is a complete linear charger for single cell lithium-ion batteries. With small TDFN-6 package and few external components, EMC5755 is well suited for portable applications. In addition, the EMC5755 is specifically designed to work within USB power specifications.
No external n 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 EMC5755 always preconditions the battery with 1/10 of the programmed charge current at the beginning of a charge cycle, until 40μs after it verifies that the battery can be fast-charged. The EMC5755 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
The EMC5755 consumes zero rever current from the battery at standby, shutdown and sleep modes.
This feature reduces the charge and discharge cycles on the battery, further prolonging the battery life. The EMC5755 can also be ud as a LDO when battery is removed. Other features include shutdown mode, charge current monitor, under voltage lockout, automatic recharge and status indicator.
Features
Programmable charge current up to 1.2A No MOSFET, n resistor or blocking diode
required
Complete linear charger in TDFN-6 for single cell
Lithium-ion batteries
Typical zero rever current from battery Thermal regulation maximizes charge rate
without risk of overheating
Charges single cell Li-ion batteries directly from
USB port
Act as a LDO when battery is removed
Pret 4.2V charge voltage with ±1% accuracy Automatic recharge Charge status indicator C/10 charge termination 45μA shutdown supply current 2.9V trickle charge threshold Soft-start limits inrush current RoHS compliant and Pb-free
Applications
Wireless handts Hand-held instruments
Portable information appliances Bluetooth application Charging docks and cradles
Typical Application Diagram
Typical Performance Characteristics
I B A T (m A )
Complete Charge Cycle (850mAh Battery)
960 mA Charger
LDO Mode
(Battery
Removed)
Time (1000s/DIV)
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V B A T (V )怎么查名下有没有房产
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010
Pin Configuration
Pin Functions
Name SOT-25
Function
CHGB
1
Open-Drain Charge Status Output. An internal N-channel MOSFET connects CHGB 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 24μA, indicating an “AC prent” condition. When the EMC5755 detects an under voltage lockout condition, CHGB is forced high impedance.
GND 2 Ground
PROG 3
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1%resistor, R PROG , to ground. When charging in constant-current mode, this pin rvos to 1V. In all modes, the voltage on this pin can be ud to measure the charge current using the following formula:
I BAT =(V PROG /R PROG )*960
The PROG pin can also be ud to shut down the charger. Disconnecting the program resistor from ground allows a 0.4μA current to pull the PROG pin high. When it reaches the
1.18V shutdown threshold voltage, the charger enters shutdown mode. This pin is also clamped to approximately
2.4V. Reconnecting R PROG to ground will return the charger to normal operation. Connecting the PROG pin to a voltage between 0.2V and 0.4V can force EMC5755 into LDO mode. The PROG pin must not be directly shorted to ground at any condition.
VIN 4
Positive Input Supply Voltage. Provides power to the charger. VIN can range from 4.25V to
5.5V and should be bypasd with at least a 1μF capacitor. When VIN drops to within
30mV above the BAT pin voltage, the EMC5755 enters shutdown mode, dropping I BAT to
less than 1μA.
NC 5 No connection.
种间关系
BAT
6
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 ts the float voltage which is disconnected in standby, shutdown and sleep modes.
Top View
Absolute Maximum Ratings (Notes 1, 2)
VIN, V B A T, V C H G B-0.3V to 6.0V V PROG (Note 3) -0.3V to VIN +0.3V BAT Short-Circuit Duration Continuous BAT Pin Current 1.2A PROG Pin Current 1.2mA Storage Temperature Range -65°C to160°C Junction Temperature (TJ) 150°C Lead Temperature (10 c.) 260°C Thermal Resistance (θJA)
6-pin TDFN 55°C/W
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Operating Ratings
Temperature Range -40°C to 85°C Supply Voltage 4.25V to 5.5V
Note: Devices are ESD nsitive. The leads should be shorted together or the device placed in conductive foam during
storage or handling to prevent electrostatic damage to the device.
Electrical Characteristics
Unless otherwi specified, T A=25°C and VIN=5V.
Symbol Parameter Conditions Min Typ Max Units
V IN Input
Voltage 4.25 5.5 V
Charge Mode, R PROG=10K (Note 4) 150 260 330 μA
Standby Mode (Charge Terminated) 50 106 150 μA
天网恢恢台词I CC Input Supply Current
Shutdown Mode (R PROG Not Connected,
V IN<V BAT or V IN <V UV)
20 45 75 μA
V FLOAT Regulated Output (Float) Voltage 0°C ≦T A≦ 85°C 4.158 4.2 4.242 V
R PROG=2K, Current Mode 447 480 513 mA
Standby Mode, V BAT=4.2V -1
1
μA
Shutdown Mode (R PROG Not Connected) -1 0 1 μA
I BAT BAT Pin Current
Sleep Mode, V IN=0V -1
1
μA
I TRICKLE Trickle Charge Current V BAT<V TRICKLE, R PROG=2K 21
50
75
mA
V TRICKLE Trickle Charge Threshold Voltage R PROG=10K, V BAT Rising 2.8 2.9 3.0 V
V TRHYS Trickle Charge Hysteresis Voltage R PROG=10K
210
mV
V UV V IN Under voltage Lockout
Threshold
From VIN Low to High 2.45 3.0 3.75 V
V UVHYS V IN Under voltage Lockout
Hysteresis
180
mV PROG Pin Rising 1.18 1.25 V
V MSD Manual Shutdown Threshold
野米饭Voltage PROG Pin Falling 1.00 1.04 V
V IN from Low to High 80 140 mV
V ASD V IN-V BAT Lockout Threshold Voltage
V IN from High to Low 5 30 mV
I TERM C/10 Termination Current
Threshold
R PROG=10K
0.1
mA/mA
V PROG PROG Pin Voltage R PROG=10K, Current Mode 0.93 1.0 1.07 V
I CHGB CHGB Pin Weak Pull-Down
Current
V CHGB=5V
23
μA
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.Publication Date: Oct. 2010
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010
V CHGB CHGB Pin Output Low Voltage I CHGB =5mA
0.23
0.6
V
V RECHRG Recharge Battery Threshold Voltage
女友的生日礼物V FLOAT -V RECHRG 160 mV
T ILM Junction Temperature in Constant Temperature Mode 120
o
C R ON
Power FET “ON” Resistance
浓硫酸密度550 m Ω T SS Soft-Start Time
I BAT =0 to I BAT
=960V/R PROG 100 μs
T RECHARGE Recharge Comparator Filter Time V BAT High to Low 0.75
2.4
4.5
ms
T TERM Termination Comparator Filter Time
I BAT Falling Below I CHG /10 0.4 1.1 2.5 ms I PROG
PROG Pin Pull-up Current
0.4
μA
Note 1: Absolute Maximum ratings indicate limits beyond which damage may occur. Electrical specifications are not
applicable when the device is operated outside of its rated operating conditions.
Note 2: All voltages are defined and measured with respect to the potential at the ground pin. Note 3: Can not exceed 6.0V.
Note 4: Supply current includes PROG pin current (approximately 100μA) but does not include any current delivered
to the battery through the BAT pin (approximately 96mA).
Order information EMC5755-00FF06NRR 00 Output voltage FF06 TDFN-6 Package NRR RoHS & Halogen free Rating: -40 to 85°C
Package in Tape & Reel
Order, Mark & Packing Information
Package Product ID Marking Packing
TDFN-6
EMC5755-00FF06NRR
5K units Tape & Reel
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010
Functional Block Diagram
State Diagram
ESMT/EMP EMC5755
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010
Typical Applications
USB/Wall Adapter Power Li-ion Charger
Full Featured Single Cell Li-ion Charger
Li-ion Charger with External Power Dissipation
Basic Li-ion Charger with Rever Polarity Input Protection
Turn off the LED after Charge is Terminated
*The formula for R1 is
A
V
R μ3511<, where V1 is the turn-on
threshold voltage of the LED device.
