LP28292-QVF

Preliminary Datasheet LP28292 1.5A Single-chip Li-ion and Li-POL Charge with OVP General Description The LP28292 is a complete constant-current/ constantvoltage linear charger for single cell lithium-ion batteries. Its TDFN-10 package and low external component count make the LP28292 ideally suited for portable applications. Furthermore, the LP28292 is specifically designed to work within USB power specifications. Its have a over voltage protection in input with 6.5V and support over zero voltages of battery can charge enable. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be ISET rammed externally with a single resistor. The LP28292 automatically terminates the charge cycle when the charge current drops to 1/10th the ISET rammed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LP28292 automatically enters a low current state, dropping the battery drain current to less than 2µA. The LP28292 can be put into shutdown mode, reducing the supply current to 25µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. Features Very Low Power Dissipation Vin Over Voltage Protection:6V Short-circuit protection Programmable Charge Current Up to 1500mA No MOSFET, Sense Resistor or Blocking Diode Required Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate Without Risk of Overheating Charges Single Cell Li-Ion Batteries Directly from USB Port 25µA Supply Current in Shutdown Time Pre-charge Conditioning With Safety Timer Reverse Leakage Protection Prevents Battery Drainage Charge Current Thermal Regulation Status Outputs for LED or System Interface Indicates Charge and Fault Conditions Optional Battery Temperature Monitoring Before and During Charge Automatic Sleep Mode for Low-Power Consumption Available in 3mm × 3mm TDFN-10 Package RoHS Compliant and 100% Lead (Pb)-Free Typical Application Circuit Order Information LP28292 - □ □ □ F: Pb-Free Package Type QV: TDFN-10 10uF VIN 1 2 3 4 5 VIN NC STAT NC VSS LP28292 VOUT NC ISET NC NC 10 9 8 7 6 R set 2K 1uF BT1 BATT BATTERY ISet=880/Rset Applications Portable Media Players/MP3 players Cellular and Smart mobile phone PDA/DSC Marking Information Please see website. Bluetooth Applications LP28292 – 02 Ver. 1.2 Datasheet Nov.-2008 Page 1 of 10 Preliminary Datasheet Functional Pin Description P a c k a g e Ty p e Pin Configurations LP28292 VIN NC 1 2 3 4 5 10 9 8 7 6 VOUT NC ISET NC NC TDFN- 10 STAT NC VSS P i n Desc ript ion PIN VIN STAT NC VSS PIN Number 1,2 3 4,7 5,11 DESCRIPTION VIN is the input power source. Connect to a wall adapter. Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20µA is connected to the STAT pin, indicating an “AC present” condition. When the LP28292 detects an under voltage lockout condition, STAT is forced high impedance. No connector. VSS is the connection to system 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, ISET 9 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) • 880 VOUT/TS VOUT 9 10 VBAT is the connection to the battery. Typically a 1µF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required. A vision the pin is Vout,B vision the pin is TS. VBAT is the connection to the battery. Typically a 1µF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required. LP28292 – 02 Ver. 1.2 Datasheet Nov.-2008 Page 2 of 10 Preliminary Datasheet LP28292 LP28292 – 02 Ver. 1.2 Datasheet Nov.-2008 Page 3 of 10 Preliminary Datasheet Function Block Diagram VIN LP28292 VSS ISET STAT LP28292 Absolute Maximum Ratings Input Voltage to GND (VIN) ----------------------------------------------------------------------------- 2.6V to 8V BAT, ISET, STAT (VX) ---------------------------------------------------------------------- 0.3V to VIN+0.3V BAT Short-Circuit Duration ---------------------------------------------------------------------------- Continuous BAT Pin Current ------------------------------------------------------------------------------------------ 1500mA Maximum Junction Temperature ---------------------------------------------------------------------------- 125°C Operating Junction Temperature Range (TJ) ----------------------------------------------------- -40℃ to 85°C Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------ 260°C Thermal Information Maximum Power Dissipation (PD,TA