LN2054Y42AMR

LN2054 Standalone Linear Li-Ion Battery Charger with Thermal Regulation ■ General Description ■ Features The LN2054 is a complete constant-current /constant  Programmable Charge Current Up to 500mA -voltage linear charger for single cell lithium-ion batteries.  No MOSFET, Sense Resistor or Blocking Diode Its ThinSOT package and low external component count Required  make the LN2054 ideally suited for portable applications. Furthermore, the LN2054 is specifically designed to work Complete Linear Charger in ThinSOT Package for single Cell Lithium-Ion Batteries  within USB power specifications. Constant-Current/Constant-Voltage Operation with No external sense resistor is needed, and no blocking Thermal Regulation to Maximize Charge Rate diode is required due to the internal MOSFET architecture. Without Risk of Overheating  Thermal feedback regulates the charge current to limit the die temperature during high power operation or high Charges Single Cell Li-Ion Batteries Directly from USB Port ambient temperature. The charge voltage is fixed at 4.2V,  Preset 4.2V Charge Voltage with 1% Accuracy and the charge current can be programmed externally with  Charge Current Monitor Output for Gas Gauging a single resistor. The LN2054 automatically terminates the  Automatic Recharge charge cycle when the charge current drops to 1/10 the  Charge Status Output Pin programmed value after the final float voltage is reached.  C/10 Charge Termination When the input supply (wall adapter or USB supply) is  2A Supply Current in Shutdown removed, the LN2054 automatically enters a low current  2.9V Trickle Charge Threshold (LN2054) state, dropping the battery drain current to less than 2A.  Soft-Start Limits Inrush Current The LN2054 can be put into shutdown mode, reducing the  Available in 5-Lead SOT-23 and SOT-89 Package th supply current to 2µA. Other features include charge current ■ Applications monitor, under-voltage lockout, automatic recharge and a status pin  Cellular Telephones, PDAs, MP3 Players to indicate charge termination and the presence of an input  Charging Docks and Cradles voltage.  Bluetooth Applications ■ Package  SOT-23-5L  SOT-89-5L ■ Typical Application Circuit VIN VIN VBAT BAT RLED PROG C1 330Ω C2 CHRG GND GND RPROG GND NOTE: C1=4.7Uf, C2=10uF， IBAT = (VPROG/RPROG)*1000 Rev.1.1 — Feb. 24, 2016 1 www.natlinear.com LN2054 ■ Ordering Information LN2054 ①②③④⑤⑥ Designator Description ① Type ②③ Symbol X CHRG pin Without trickle charge Y CHRG pin With trickle charge 0 4.0 1 4.1 2 4.2 A 00 The second part of B 25 regulator Output Voltage C 50 D 75 M SOT-23-5L P SOT-89-5L R Embossed tape: Standard feed L Embossed tape: Reverse feed The first part of regulator Output Voltage ④ ⑤ ⑥ Description Packaging Types Device Orientation ■ Pin Configuration 5 4 5 4 PROG VIN PROG VIN CHRG GND BAT CHRG GND BAT 1 2 3 1 2 3 SOT-89-5L (TOP VIEW) SOT-23-5L (TOP VIEW) ■ Pin Assignment Pin Number Pin Name SOT-89-5L SOT-23-5L 1 1 CHRG 2 2 GND 3 3 BAT 4 4 VIN 5 5 PROG ■ Pin Function CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG 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 CHRG pin, indicating an “AC present” condition. When the LN2054 detects an under voltage lockout condition, CHRG is forced high impedance. Rev.1.1 — Feb. 24, 2016 2 www.natlinear.com LN2054 GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. 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. VIN (Pin 4): Positive Input Supply Voltage. Provides power to the charger. VCC can range from 4.25V to 6.5V and should be bypassed with at least a 1µF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the LN2054 enters shutdown mode, dropping IBAT to less than 2µA. PROG (Pin 5): 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) * 1000 The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3µA current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 2µA. This pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as high as 1.5mA. Reconnecting RPROG to ground will return the charger to normal operation. ■ Marking Rule  ① ② ③ ④ SOT-89-5L、SOT-23-5L . . . . . . ①②③④ . . . .. . ①②③④ SOT-89-5L (TOP VIEW) SOT-23-5L (TOP VIEW) Symbol Product Name 2 LN2054◆◆◆◆◆ Represents the product name Represents the type of the trickle charge voltage and CHRG pin Symbol Product Series X LN2054X◆◆◆◆ Y LN2054Y◆◆◆◆ Represents the regulator output voltage Symbol Voltage Symbol Voltage A 4.0 H 4.150 B 4.025 K 4.175 C 4.05 L 4.2 D 4.075 M 4.225 E 4.1 N 4.250 F 4.125 P 4.275 Represents the assembly lot No. 0-9，A-Z; 0-9，A-Z mirror writing，repeated（G，I，J，O，Q，W exception） Rev.1.1 — Feb. 24, 2016 3 www.natlinear.com LN2054 ■ Block Diagram VIN 4 120℃ TA 1x 1000x TDIE 5uA 3 BAT MA R1 CA VA SHDN C1 R2 REF 1.21V R3 1V R4 0.1V C2 CHRG R5 1 STANDBY TO BAT C3 VIN 3uA 2.9V 5 RPROG PROG 2 GND ■ Absolute Maximum Ratings Parameter Symbol Maximum Rating Input Supply Voltage Vcc VSS-0.3～VSS+10 PROG pin Voltage Vprog VSS-0.3～Vcc+0.3 BAT pin Voltage Vbat Vss-0.3～7 CHAG pin Voltage Vchrg VSS-0.3～VSS+10 Power Dissipation PD BAT pin Current Ibat 500 mA PROG pin Current Iprog 800 uA Operating Ambient Temperature Topa -40～+85 Storage Temperature Tstr -65～+125 SOT-23-5L 250 SOT-89-5L 500 Unit V mW °C Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Rev.1.1 — Feb. 24, 2016 4 www.natlinear.com LN2054 ■ Electrical Characteristics Parameter Symbol Input supply voltage Vcc Input supply current Condition Min Typ 4.25 Ibat V 2000 µA Standby mode 200 500 µA 40 µA connected, Vcc