Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability without notice, Standalone Linear Li-Ion Battery Charger with Thermal Regulation in SOT-25
General Description
The EMC5754 is a complete linear charger for single cell lithium-ion batteries. With small SOT-25 package and few external components, EMC5754 is well suited for portable applications. In addition, the EMC5754 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 EMC5754 always preconditions the battery with 1/10 of the programmed charge current at the beg
inning of a charge cycle, until 40µs after it verifies that the battery can be fast-charged. The EMC5754 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
教育论文发表The EMC5754 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 EMC5754 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小学一年级数学上册
Programmable charge current up to 1A No MOSFET, n resistor or blocking diode
required
Complete linear charger in SOT-25 for single cell
美术创意画
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)
580 mA Charger
LDO Mode
(Battery Removed)
Time (1000s/DIV)
V B A T (V )
Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability without notice, Pin Configuration SOT-25(Top View) Order information
EMC5754--00VF05GRR
00 Operation
VF05 SOT-25 Package GRR RoHS package
Commercial Grade Temperature Rating: -40 to 85°C
Package in Tape & Reel
Marking & Packing Information
Package Type
Marking
Product ID
Transport Media
SOT-25
EMC5754-00VF05GRR 3K units Tape & Reel
Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability without notice, 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 EMC5754 detects an under voltage lockout condition, CHGB is forced high impedance.
GND
2
投资风险分析Ground
BAT
3
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.
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 EMC5754 enters shutdown mode, dropping I BAT to less than 1µA.
PROG
5
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
门牙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 EMC5754 into LDO mode. The PROG pin must not be directly shorted to ground at any condition.
Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability without notice, Absolute Maximum Ratings (Notes 1, 2)
五里铺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 1A PROG Pin Current 1mA Storage Temperature Range -65°C to160°C
Junction Temperature (TJ) 150°C Lead Temperature (10 c.) 260°C Thermal Resistance (θJA )
SOT-25 (Note 5)
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)南丁格尔的故事
150 260 330 µA Standby Mode (Charge Terminated) 50 106 150 µA 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 0 1 µA Shutdown Mode (R PROG Not Connected) -1 0 1 µA I BAT
BAT Pin Current
Sleep Mode, V IN =0V
-1 0 1 µA I TRICKLE Trickle Charge Current
V BAT <V TRICKLE , R PROG =2K
21 50 66 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 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
24
µA
Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability w
ithout notice, V CHGB CHGB Pin Output Low Voltage I CHGB =5mA 0.23 0.6 V V RECHRG Recharge Battery Threshold Voltage
V FLOAT -V RECHRG 160 mV
T ILM Junction Temperature in Constant Temperature Mode 120 o C
R ON Power FET “ON” Resistance
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).
Note 5: 80o C/W to150o C/W, depending on PCB Layout.
Functional Block Diagram
Elite MicroPower Inc. rerves the right to make changes to improve reliability or manufacturability without notice, State Diagram
Typical Applications
USB/Wall Adapter Power Li-ion Charger
Full Featured Single Cell Li-ion Charger
色彩风景写生Li-ion Charger with External Power Dissipation
Basic Li-ion Charger with Rever Polarity Input Protection
