HX6001-NEC

HX1001 HX6001 Standalone Linear Li-Ion Battery Charger with Thermal Regulation Features    Description Programmable Charge Current up to The HX6001 is a complete constant-current/ 700mA constant-voltage linear charger for single cell No MOSFET, Sense Resistor or Blocking lithium-ion batteries. Its package and low Diode Required external component count make the HX6001 Constant-Current/Constant-Voltage ideally Operation with Thermal Regulation Furthermore, to designed Maximize Charge Rate   suited to for the portable HX6001 work within applications. is specifically USB power specifications. Charges Single Cell Li-Ion Batteries Directly from USB Port No external sense resistor is needed, and no Preset 4.2V Charge Voltage with 　1% blocking diode is required due to the internal Accuracy MOSFET architecture. The charge voltage is  Automatic Recharge  2.9V Trickle Charge Threshold  Available in 5-Lead SOT-23 Package fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The HX6001 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float Applications voltage is reached.  Charger for Li-Ion Coin Cell Batteries The HX6001 converters are available in the  Portable MP3 Players, Wireless Headsets industry standard SOT-23-5L power packages  Bluetooth Applications (or upon request).  Multifunction Wristwatches Order Information HX6001- ① ②: SYMBOL ① ② DESCRIPTION Denotes Output Voltage: N: 4.2V Denotes Package Type: E: SOT-23-5L w w w. h x s e m i . c o m 1 HX6001 Typical Application Circuit DC+ 4 VCC BAT VOUT Battery 3 4.5V ~ 6.5V 1 CIN 10µF R1 300Ω CHRG PROG GND 2 5 RSET COUT 10µF * IBAT = (VPROG/RSET) • 900. * When charging in constant-current mode, the VPROG is usually 1V. Pin Assignment and Description PIN NAME DESCRIPTION 1 CHRG Open-Drain Charge Status Output 2 GND Ground 3 BAT Charge Current Output 4 VCC Positive Input Supply Voltage 5 PROG Charge Current Program Absolute Maximum Ratings (Note 1)  Input Supply Voltage (VCC) ........................................................................................... -0.3V ～ 7V  PROG.............................................................................................................. -0.3V ～ VCC + 0.3V  BAT, CHRG.................................................................................................................... -0.3V ～ 7V  BAT Pin Current ..................................................................................................................... 800mA  Maximum Junction Temperature............................................................................................. +150℃  Operating Ambient Temperature Range (Note 2)......................................................-40℃ ～ +85℃  Storage Temperature Range …………………………………………….................. -65℃ ～ +125℃  Lead Temperature (Soldering, 10 sec)................................................................................... +265℃ Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: The HX6001 is guaranteed to meet performance specifications from 0℃ to 70℃. Specifications over the –40℃ to 85℃ operating temperature range are assured by design, characterization and correlation with statistical process controls. www.hxsemi.com 2 HX6001 Electrical Characteristics Operating Conditions: TA=25℃, VCC=5V, unless otherwise specified. SYMBOL PARAMETER VCC Input Supply Voltage VOVLO IQ OVLO Threshold Input Supply Current CONDITIONS MIN TYP MAX UNITS 4.5 5.0 6.5 V VIN Rising 6.8 V Standby Mode (Charge Terminated) 48 μA Shutdown Mode (RPROG Connected, VCC < VBAT) 80 μA Not Battery Voltage Regulation Constant-Current Charge VFLOAT IBAT Regulated Output (Float) Voltage BAT Pin Current 0℃≤ TA ≤85℃ 4.16 V 90 mA RPROG = 2k, Current Mode 450 mA -7 μA ±13 μA Standby Mode, VBAT = 4.2V (RPROG Not Sleep Mode, VCC = 0V PROG Pin Voltage 4.24 RPROG = 10k, Current Mode Shutdown Mode Connected) VPROG 4.2 RPROG = 2k, Current Mode 0.95 ±0.2 ±2 μA 1 1.05 V Trickle Charge ITRIKL Trickle Current VTRIKL ITERM Charge RPROG = 2k 45 mA Trickle Charge Threshold Voltage RPROG = 10k, VBAT Rising 2.9 V C/10 Termination Current Threshold RPROG = 2k 45 mA 250 mV VRECHRG Comparator (Battery Recharge Threshold) ΔVRECHRG Recharge Battery Threshold Voltage www.hxsemi.com VFLOAT - VRECHRG 3 HX6001 Pin Functions CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed or reverse battery lockout / No AC is detected, CHRG is forced high impedance. GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. It should be bypassed with at least a 1μF capacitor. It 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. It provides power to the charger. VCC can range from 4.5V to 6.5V and should be bypassed with at least a 1μF capacitor. 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/RSET) • 900. The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground, the charger enters shutdown mode. Reconnecting RPROG to ground will return the charger to normal operation. www.hxsemi.com 4 HX6001 Block Diagram Application Information The HX6001 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm with programmable current. Charge current can be programmed to 700mA (using a good thermal PCB layout) with a final float voltage accuracy of ±1%. The HX6001 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only less external components. Furthermore, the HX6001 is capable of operating from a USB power source. Normal Charge Cycle A charge cycle begins when the voltage at the VCC pin rises above 4.5V and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. www.hxsemi.com 5 HX6001 If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the HX6001 supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for full current charging. When the BAT pin voltage rises above 2.9V, the charger goes into the fast charge constant-current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the HX6001 enters constant-voltage mode and the charge current begins to decrease. The charge cycle ends when the charge current drops to 1/10 of the programmed value. Charge Termination A charge cycle is terminated when the charge current falls to 1/10th the programmed value after the final float voltage is reached. This condition is detected by using an internal filtered comparator to monitor the PROG pin. When charging, transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short periods of time before the DC charge current has dropped to 1/10th the programmed value. Once the average charge current drops below 1/10th the programmed value, the HX6001 terminates the charge cycle and ceases to provide any current through the BAT pin. In this state, all loads on the BAT pin must be supplied by the battery. The HX6001 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the recharge threshold (VRECHRG), another charge cycle begins and current is once again supplied to the battery. To manually restart a charge cycle in standby mode, the input voltage must be removed and reapplied, or the charger must be shut down and restarted using the PROG pin. Shutdown Mode The HX6001 can be shut down by floating PROG pin. In shutdown mode, the battery drain current is reduced to 13μA and the supply current to about 80μA. A new charge cycle can be initiated by reconnecting the program resistor. Removing the input power supply will put the charger into sleep mode. Automatic Recharge Once the charge cycle terminates, the HX6001 continuously monitors the BAT pin voltage using a comparator. When the battery voltage falls 250mV below 4.2V(which corresponds to approximately 80% to 90% battery capacity), a charge cycle will restart. This ensures that the battery is kept at or near a fully charged condition and eliminates the need for periodic charge cycle initiations. The CHRG output enters a strong pull down state during recharge cycles. Programming Charge Current The charge current is programmed using a single resistor RPROG from PROG pin to ground. The battery charge current is 900 times the current out of the PROG pin. The RPROG and the charge current can be calculated as following equation: RPROG=1V/IBAT • 900, IBAT=1V/ RPROG • 900. The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin www.hxsemi.com 6 HX6001 voltage and using the following equation: IBAT= RPROG/ RPROG • 900. Thermal Limiting An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 120℃. This feature protects the HX6001 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the HX6001. The charge current can be set according to typical (not worst-case) ambient temperature with the assurance that the charger will automatically reduce the current in worst-case conditions. Thin SOT power considerations are discussed further in the Applications Information section. VCC Bypass Capacitor Many types of capacitors can be used for input bypassing, however, caution must be exercised when using multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a live power source. Adding a 1.5W resistor in series with an X5R ceramic capacitor will minimize start-up voltage transients. www.hxsemi.com 7 HX6001 Packaging Information SOT-23-5L Package Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950(BSC) 0.037(BSC) e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 Subject changes without notice. www.hxsemi.com 8 Information furnished by Hexin Semiconductor is believed to be accurate and reliable. However, no responsibility is assumed for its use.