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EMC5755 Dataheets PDF



Part Number EMC5755
Manufacturers Elite Semiconductor
Logo Elite Semiconductor
Description Standalone 1.2A Linear Li-Ion Battery Charger
Datasheet EMC5755 DatasheetEMC5755 Datasheet (PDF)

ESMT/EMP EMC5755 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 sense resistor and blocking diode are required. Charging current can be programmed externally.

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ESMT/EMP EMC5755 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 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 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 reverse 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 used 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, sense resistor or blocking diode required Complete linear charger in TDFN-6 for single cell Lithium-ion batteries Typical zero reverse 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 Preset 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 handsets Hand-held instruments Portable information appliances Bluetooth application Charging docks and cradles „ Typical Application Diagram 960 mA Charger LDO Mode (Battery Removed) „ Typical Performance Characteristics Complete Charge Cycle (850mAh Battery) IBAT (mA) Time (1000s/DIV) Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010 Revision: 2.2 1/17 VBAT (V) ESMT/EMP Pin Configuration Top View EMC5755 Pin Functions Name SOT-25 Function 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 CHGB 1 N-channel MOSFET is replaced by a weak pull-down of approximately 24μA, indicating an “AC present” condition. When the EMC5755 detects an under voltage lockout condition, CHGB is forced high impedance. GND 2 Ground Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1%resistor, RPROG, to ground. When charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: IBAT=(VPROG/RPROG)*960 PROG 3 The PROG pin can also be used 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 RPROG 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. Positive Input Supply Voltage. Provides power to the charger. VIN can range from 4.25V to VIN 4 5.5V and should be bypassed with at least a 1μF capacitor. When VIN drops to within 30mV above the BAT pin voltage, the EMC5755 enters shutdown mode, dropping IBAT to less than 1μA. NC 5 No connection. Charge Current Output and battery voltage feedback. This pin provides charge current BAT 6 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 standby, shutdown and sleep modes. Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Oct. 2010 Revision: 2.2 2/17 ESMT/EMP Absolute Maximum Ratings (Notes 1, 2) Junction Temperature (TJ) VI N, V B A T , V C H G B VPROG BAT Short-Circuit Duration BAT Pin Current PROG Pin Current Storage Temperature Range -0.3 V to 6 .0 V (Note 3) -0.3V to VIN +0.3V Continuous 1.2A 1.2mA -65°C to160°C Lead Temperature (10 sec.) Thermal Resistance (θJA) 6-pin TDFN EMC5755 150°C 260°C 55°C/W Operating Ratings Temperature Range Supply Voltage -40°C to 85°C 4.25V to 5.5V Note: Devices are ESD sensitive. The leads shoul.


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