XT2051Y2ASR-G

XT2051 1.0A Compatible With The USB Interface, Linear Battery Management Chip  Automatic recharge  Charge status output pin The XT2051 is a constant- current / constant- voltage  1/10 charge current termination charger circuit for single cell lithium-ion batteries. The  40µA supply current in shutdown device includes an internal power transistor, does not need  2.9V trickle charge threshold external current sense resistor and blocking diode in  Soft-Start limits inrush current applications.  OVP protection function , the input is higher than 6.8V, ■ General Description XT2051 requires minimal external components, and meet the USB bus specification, is very stop charging  Output with protection against anti-irrigation Thermal modulation circuit can control the internal  Available in eSOP-8/PP or eMSOP-8/PP Package chip temperature in a safe range when the device power  When you unplug VIN , the IC does not consume suitable for portable applications in the field. dissipation be relatively large or the ambient temperature battery power be higher. Within a fixed constant charge voltage 4.2V, can ■ Applications also be adjusted by an external resistor. Charge current set by an external resistor.  Mobile phones When the input voltage (AC adapter or USB power  Digital Cameras supply) power is lost, XT2051 automatically enters a low  MP4 Player power sleep mode, then the battery current consumption is  Bluetooth applications less than 0.1μA. Built-in protection circuits against irrigation,  Electronic Dictionary when the battery voltage is higher than the input voltage,  portable devices automatically turn off built-in power MOSFET. Other  all kinds of charger features include low input voltage latch, automatic  Mobile power recharge, the battery temperature monitoring, Built - in OVP protection and charge status / charge status indication functions. XT2051 uses thermally enhanced 8-pin small outline package eSOP-8/PP or eMSOP-8/PP. ■ Features  Programmable charge current up to 1A  No MOSFET, sense resistor or blocking diode required  Complete linear charger in small package for single cell lithium-ion batteries  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  Preset 4.2V  Monitor output charge current  default charging voltage of 4.2V1%, can be adjusted by the FB Rev.1.0 —July. 17, 2012 1 www.silinktek.com XT2051 ■ Package   eSOP-8/PP TEMP 1 8 FB ISET 2 7 CHRG GND 3 6 DONE VIN 4 5 eMSOP-8/PP 8 FB TEMP 1 ISET 2 7 CHRG GND 3 6 DONE VIN 4 5 VBAT VBAT eMSOP-8 (Top View) eSOP-8 (Top View) ■ Ordering Information XT2051①②③④⑤ Designator Description Symbol Description ① Type X No trickle charge Y Have trickle charge 0 4.0 1 4.1 2 4.2 A ②00 The second part of regulator B ②25 Output Voltage C ②50 D ②75 S eSOP-8 Q eMSOP-8 R positive L negative The first part of regulator ② Output Voltage ③ ④ ⑤ Packaging Types Device Orientation ■ Pin Function  TEMP (Pin 1): The TEMP pin to the battery of the NTC sensor output. If the TEMP pin voltage is less than the input voltage of 30% or greater than 60% of the input voltage means the battery temperature is too low or too high, then the charge will be suspended. If the TEMP input voltage between 30% and 60%, then the battery fault condition will be cleared, the charge will continue.  ISET (Pin 2): Charge current programming, charge current monitoring and close pin. Charge current is controlled by a resistor of precision of 1%to the ground. In the constant charge current state, this port provides 1V voltage. In all conditions, this port charge current can be calculated using the following formula: IBAT = (VISET/RISET) ×1000 ISET port can also be used to turn off the charger. Resistance to side with the separation of programming can pull the 3µA Rev.1.0 —July. 17, 2012 2 www.silinktek.com XT2051 current source to increase ISET port voltage. When the suspension reached the limit voltage 1.21V, the device enters stop state, after charging the input current drop to 25µA. This port pinch-off voltage is about 2.4V. If supply this port voltage more than pinch-off voltage, the current will be 1.5 mA. Through combinating ISET pin to the ground, the charger will back to normal.  GND (Pin 3): Ground terminal .The EXPOSED pin is also connected with pin 3.  VIN (Pin 4): Supply positive input voltage. Power supply for the charger. VCC can be 4.25V to 6.5V and must have at least 1F bypass capacitor. If the BAT pin voltage of VCC down to within 30 mV, LN2052 into the suspension state, and make BAT Current less than 2A.  BAT (Pin 5): Make the battery's positive terminal connected to this pin. When the power supply voltage lower than the threshold latch voltage or sleep mode voltage, BAT pin current is less than 2μA. BAT pin provide the battery charge current and constant voltage charging voltage.  DONE (Pin 6): When charging end, DONE pin is pulled low by internal switch represents that charge has ended; otherwise DONE pin is high impedance state.  CHRG (Pin 7): When the charger to the battery charging, CHRG pin is pulled low by the internal switch,represents charging being; otherwise CHRG pin is in high impedance state.  FB ( Pin 8): This pin can test Kelvin battery voltage, and thus precisely modulated constant voltage battery charging voltage, avoiding the positive from the battery to the BAT pin XT2051 or contact resistance between the resistance wire and other parasitic resistance of the charge. If the FB pin and the BAT pin is an indirect one resistor, users can adjust the constant charging voltage ■ Marking Rule  eSOP-8/eMSOP-8 XT2051 ①②③* ******** ①②③Represents the version number ******:Number of several, represents the quality tracking information! ■ Absolute Maximum Ratings Parameter Symbol Maximum Rating Input Supply Voltage Vcc VSS-0.3～VSS+7 ISET pin Voltage Vprog VSS-0.3～Vcc+0.3 BAT pin Voltage Vbat Vss-0.3～6 DONE pin Voltage Vdone VSS-0.3～VSS+7 Rev.1.0 —July. 17, 2012 3 Unit V www.silinktek.com XT2051 CHAG pin Voltage Vchrg VSS-0.3～VSS+7 BAT pin Current Ibat 1500 mA ISET pin Current Iprog 1500 µA Operating Ambient Temperature Topa -40～+85 Storage Temperature Tstr -65～+125 °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. ■ Block Diagram Figure 1. Rev.1.0 —July. 17, 2012 4 www.silinktek.com XT2051 ■ Typical  Application Circuit Constant- Current / Constant- Voltage 4.2V Charging Application INPUT VOLTAGE FROM 4.35V TO 6V VIN 4.7uF FB BAT 3K 4.7u R1 RED GREEN TEMP NTC OPTION CHRG R2 ISET DONE RSET BATTERY PACK EXPOSED PAD GND Figure 2.  The use of an external resistor adjustable constant current and constant voltage charging applications INPUT VOLTAGE FROM 4.35V TO 6V Rx VIN 4.7uF FB BAT 3K 4.7u R1 GREEN RED TEMP NTC OPTION CHRG ISET DONE R2 RSET BATTERY PACK EXPOSED PAD GND Figure 3. Rev.1.0 —July. 17, 2012 5 www.silinktek.com XT2051 ■ Electrical Characteristics (Ta=25℃,Unless specifically designated) Parameter Symbol Input supply voltage Vcc Input supply current Icc Condition Min 4.25 BAT pin Current Ibat Unit 6.5 V 200 2000 µA Standby mode 200 500 µA 25 70 µA 4.158 4.2 4.242 V Riset=10k,Current mode 90 100 110 mA Riset=1k,Current mode 900 1000 1100 mA Standby mode,Vbat=4.2V 0 -2.5 -6 µA Shutdown mode ±0.1 µA Sleep mode,Vcc=0V ±0.1 µA connected,Vcc