XT2055Y42AMR-G

XT2055 Standalone Linear Li-Ion Battery Charger with Thermal Regulation ■ General Description ■ Applications The XT2055 is a complete constant-current /constant  Cellular Telephones, PDAs, MP3 Players -voltage linear charger for single cell lithium-ion batteries.  Bluetooth Applications Its Thin SOT package and low external component count ■ Features make the XT2055 ideally suited for portable applications. Furthermore, the XT2055 is specifically designed to work  Programmable charge current up to 500mA within USB power specifications.  No MOSFET, sense resistor or blocking diode No external sense resistor is needed, and no blocking required  diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the Complete linear charger in thinsot package for single cell lithium-ion batteries  die temperature during high power operation or high Constant-current/constant-voltage operation with ambient temperature. The charge voltage is fixed at 4.2V, thermal regulation to maximize charge rate without and the charge current can be programmed externally with risk of overheating  a single resistor. The XT2055 automatically terminates the th charge cycle when the charge current drops to 1/10 the Charges single cell li-ion batteries directly from USB port 1% accuracy programmed value after the final float voltage is reached.  Preset 4.2V charge voltage with When the input supply (wall adapter or USB supply) is  Charge current monitor output for gas gaugin removed, the XT2055 automatically enters a low current  Charge status output pin state, dropping the battery drain current to less than 2µA.  C/10 charge termination The XT2055 can be put into shutdown mode, reducing the  25µA supply current in shutdown supply current to 25µA.  2.9V trickle charge threshold (XT2055) monitor,  Soft-start limits inrush current under-voltage lockout, automatic recharge and a status pin  Available in 6-Lead SOT-23 Other features include charge current to indicate charge termination and the presence of an input ■ Package voltage.  SOT-23-6L ■ Typical Application Circuit VIN VBAT BAT VIN 1K RLED C1 GLED C2 DONE PROG CHRG RPROG GND GND Rev.1.1 — Feb. 29. 2016 GND 1 http://www.silinktek.com XT2055 注：C1=4.7uF，C2=10uF，IBAT = (VPROG/RPROG)*1000 ■ Ordering Information XT2055 ①②③④⑤⑥ Designator Description ① Type Symbol X Without trickle charge Y With trickle charge 0 4.0 1 4.1 2 4.2 A 00 The second part of regulator B 25 Output Voltage C 50 D 75 M SOT-23-6L R Embossed tape: Standard feed L Embossed tape: Reverse feed The first part of regulator ②③ Output Voltage ④ Description ⑤ Packaging Types ⑥ Device Orientation ■ Pin Configuration 6 5 4 PROG DONE VIN CHRG GND BAT 1 2 3 SOT-23-6L (TOP VIEW) ■ Pin Assignment Pin Number Pin Name SOT-23-6L Rev.1.1 — Feb. 29. 2016 1 CHRG 2 GND 3 BAT 4 VIN 5 DONE 6 PROG 2 http://www.silinktek.com XT2055 ■ 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 XT2055 detects an under voltage lockout condition, CHRG is forced high impedance. 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. VCC (Pin 4): Positive input supply voltage. Provides power to the charger. VCC should be bypassed with at least a 1µF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the XT2055 enters shutdown mode, dropping IBAT to less than 2µA. DONE (Pin5): Full indication output, when fully charged, DONE port is an internal N-channel MOSFET placed in low position. In the charging process, low-power lock condition is detected; the input is too high to detect locking conditions, DONE-Z state. 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 25µA. 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  SOT-23-6L . . . .. . ① ② ③ ④ SOT-23-6L (TOP VIEW) ① Represents the product name Rev.1.1 — Feb. 29. 2016 Symbol Product Name 2 XT2055◆◆◆◆◆ 3 http://www.silinktek.com XT2055 ② Represents the type of the trickle charge voltage and CHRG pin Symbol Product Series Description C XT2055X◆◆◆◆ Without trickle charge D XT2055Y◆◆◆◆ With trickle charge ③ Represents the regulator output voltage ④ 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） ■ Absolute Maximum Ratings Parameter Symbol Maximum Rating Vcc VSS-0.3～VSS+10 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 µA Operating Ambient Temperature Topa -40～+85 Storage Temperature Tstr -65～+125 Input Supply Voltage PROG pin Voltage SOT-23-6L 250 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. 29. 2016 4 http://www.silinktek.com XT2055 ■ Block Diagram VIN 4 120℃ TA 1x 1000x TDIE 5uA 3 BAT MA R1 CA VA - 6.8V + VIN OVP SHDN DONE R2 C1 REF 1.21V R3 5 1V STDBY R4 VA 0.1V C2 CHRG R5 1 STANDBY C3 TO BAT VIN 3uA 2.9V 6 PROG Rev.1.1 — Feb. 29. 2016 5 RPROG 2 GND http://www.silinktek.com XT2055 ■ Electrical Characteristics Parameter Input supply voltage Input supply current Symbol Condition Vcc Icc Min 4.25 BAT pin Current Ibat Unit 6.5 V 300 2000 µA Standby mode 200 500 µA 25 50 µA connected, Vcc