SY6952BFCC

SY6952B 2A Single-Cell High Efficiency Switching Charger with Adaptive Input Current Limit General Description Features  Wide Input Voltage Range: 4.0V to 23V  High Efficiency Int. Synchronous Buck Regulator with Fixed 800kHz Switching Frequency  Trickle Current / Constant Current / Constant Voltage Charge Mode  Adaptive input current limit  Programmable Charging Timeout  4.35 and 4.2V selectable cell voltage  Programmable (2A MAX) Constant Charge Current  Input Voltage UVLO and Battery OVP  Over Temperature Protection  Output Short Circuit Protection  Charge Status Indication  Normal Synchronous Buck Operation when Battery Removed  Compact package SO8E SY6952B is a 4.0-23V input, 2A single-cell synchronous buck Li-Ion battery charger, suitable for portable application. VSET pin is convenient for different cell voltage. Integrated 800 kHz synchronous buck regulator consists of 25V rating FETs with extremely low ON resistance to achieve high charge efficiency and simple peripheral circuit design. Ordering Information SY6952□(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SY6952BFCC Package type SO8E Note Applications       Cellular Telephones, PDA, MP3 Players, MP4 Players Digital Cameras Bluetooth Applications PSP Game Players, NDS Game Players Notebook Typical Applications QBK INPUT CIN IN RSTAT DSTAT STAT TIM SY6952B Battery Charge Control & Protection Logic L RS LX IN RS RNOR CTIM Li-Ion Battery BAT VSET High/Low/Floating NTC CBAT RNTC GND Figure1. Schematic Diagram DS_SY6952B Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY6952B Pinout (top view) TIM 1 RS 2 BAT 3 NTC 4 GND 8 IN 7 LX 6 STAT 5 VSET (SO8E) Top Mark: ALBxyz (device code: ALB, x=year code, y=week code, z= lot number code) Name Number TIM 1 RS 2 BAT 3 NTC 4 VSET 5 STAT 6 LX 7 IN 8 GND Exposed pad Description Charge time limit pin. Connect this pin with a capacitor to ground. Internal current source charge the capacitor for TC mode and CC mode’s charge time limit. TC charge time limit is about 1/9 of CC charge time. Charge current program pin. Connect a current sense resistor from RS pin to BAT pin. Average charge current is detected for both TC mode and CC mode. Battery positive pin. Thermal protection pin. UTP threshold is about 75%VIN and OTP threshold is about 30%VIN. Pull up to VIN can disable charge logic and make the IC operate as normal buck regulator. Pull down to ground can shut down the IC. VSET is pull down internally. Open or pull down for 4.2V cell voltage, pull up for 4.35V cell voltage. Charge status indication pin. It is open drain output pin and can be used to turn on a LED to indicate the charge in process. When the charge is done, LED is off. Switch node pin. This pin connects the drains of the integrated main and synchronous power MOSFET switches. Connect to external inductor. Positive power supply input pin. VIN ranges from 4V to 23V for normal operation. It has UVLO function and must be120mV greater than the battery voltage to enable normal operation. Ground pin. Absolute Maximum Ratings (Note 1) VSET, NTC, STAT ----------------------------------------------------------------------------------------------------- -0.5- 32V IN, BAT, LX ------------------------------------------------------------------------------------------------------------ -0.5- 25V TIM ------------------------------------------------------------------------------------------------------------------------ -0.5- 3.6V RS -------------------------------------------------------------------------------------------------------- BAT-0.3V to BAT+0.3V LX Pin current continuous --------------------------------------------------------------------------------------------------- 2.5A Power Dissipation, PD @ TA = 25°C, SO8E------------------------------------------------------------------------------- 3.3W Package Thermal Resistance θ JA ----------------------------------------------------------------------------------------- ----------------------- 30°C/W θ JC --------------------------------------------------------------------------------------------------------------- 20°C/W Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 150°C Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 125°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ---------------------------------------------------------------------------------------------------------- 200V DS_SY6952B Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY6952B Recommended Operating Conditions VSET, NTC, STAT ------------------------------------------------------------------------------------------------------ -0.3- 30V IN, BAT, LX ------------------------------------------------------------------------------------------------------------- -0.3- 23V TIM ----------------------------------------------------------------------------------------------------------------------- -0.3- 3.6V RS -------------------------------------------------------------------------------------------------------- BAT-0.1V to BAT+0.1V LX Pin current continuous ------------------------------------------------------------------------------------------------------- 2A Junction Temperature Range ---------- ------------------------------------------------------------------------ -20°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------ -40°C to 85°C DS_SY6952B Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY6952B Electrical Characteristics TA=25°C, VIN=15V, GND=0V, CIN=10uF, L=6.8uH, RS=25mΩ, CTIM=330nF, unless otherwise specified. Symbol Parameter Bias Supply (VIN) VIN Supply voltage Conditions Typ 4.0 VUVLO VIN under voltage lockout threshold ∆VUVLO VIN under voltage lockout hysteresis VOVP Input overvoltage protection ∆VOVP Input overvoltage protection hysteresis Quiescent Current IBAT Battery discharge current IIN Input leakage current Oscillator and PWM fOSC Oscillator frequency D PFET duty cycle Power MOSFET RNFET RDS(ON) of N-FET RPFET RDS(ON) of P-FET Voltage Regulation Low VSET for 4.2V cell voltage VCV High VSET for 4.35V cell voltage 4.2V CV threshold for Recharge ΔVRCH 4.35V CV threshold for Recharge VTRK TC charge mode voltage threshold Battery Connect Detection NTC voltage threshold for Battery VDET detect tDET Detect delay time Charge Current Internal charge current accuracy for Constant Current Mode Internal charge current accuracy for Trickle Current Mode Charge Termination ITERM Charge Termination Current TTERM Termination delay time Input current limit slow response IN voltage falling threshold at high VINSL current ∆VINSL IN voltage hysteresis at high current Input current limit quick response IN voltage falling threshold at high ∆V current ∆VINQK IN voltage hysteresis at high current Output Voltage OVP VOVP Output voltage OVP threshold Output Short Protection VSHOT Output short protection threshold fFBK Frequency fold back ILM Power FET current limit Timer DS_SY6952B Rev. 0.9C © 2019 Silergy Corp. Min VIN rising and measured from VIN to GND Measured from VIN to GND VIN rising and measured from VIN to GND Measured from VIN to GND 0°C