RT9466GQW

® RT9466 5A Single Cell Li-Ion Switching Battery Charger with Power Path Management and USB-OTG Boost Mode General Description Features The RT9466 is a switch-mode single cell Li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, power MOSFETs, input current sensing and regulation, high-accuracy voltage regulation, and charge termination. The charge current is regulated through integrated sensing resistors. The RT9466 also features USB On-The-Go (OTG) support.  The RT9466 optimizes for charging task by using a control algorithm to vary the charge rate for different modes, including pre-charge mode, fast charge mode (constant voltage and constant current). The key charge parameters are programmable through an I2C interface. The RT9466 will resume the charge cycle whenever the battery voltage falls below an internal recharge threshold, and can automatically enter sleep mode if the input power supply is removed. Other features include under-voltage protection, overvoltage protection, thermal regulation and reverse leakage protection.        The RT9466 is available in a WQFN-24L 4x4 package.  Applications     Cellular Telephones Personal Information Appliances Tablet PC, Power Bank Portable Instruments     Ordering Information RT9466 Package Type QW : WQFN-24L 4x4 (W-Type) (Exposed Pad-Option 2) Note : Lead Plating System G : Green (Halogen Free and Pb Free) Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.    High Efficiency 5A, 1.5MHz Switching Charger with Output Inductor DFE252012F, TOKO  Charging Efficiency 90.25% at ICHG = 2A  Charging Efficiency 88.86% at ICHG = 3A  Charging Efficiency 84.2% at ICHG = 5A Synchronous 1.5MHz/0.75MHz Fixed-Frequency PWM Controller with Up to 95% Duty Cycle Power Path Management by BATFET Control Support High Voltage Input (9V/12V) Support High Voltage Input Adapter (Pump Express 1.0/2.0) Support IR Compensation Function from Charger Output to Cell Terminal Optimize Input Sourcing Capability to Prevent Overload 2  AICR Current Limit Setting via I C  ILIM Pin for Current Limit Setting  Average Input Current Limit Measurement Shipping Mode for Battery Leakage Reduction Wake Up System, Exit Shipping Mode, and Reset System by QON Pin Automatic Charging Average Input Current Regulation (AICR) : 0.1A to 3.25A in 50mA Steps Charge Current Regulation Accuracy : ± 7% Charge Voltage Regulation Accuracy : ± 1% (0 to 85°°C) Protection for Overall System Considerations  Thermal Regulation for Current Reduction and Over-Temperature Protection  Input Over-Voltage Protection  Input Bad Adapter Protection  Battery Over-Voltage Protection Support ADC Conversion for  VBUS, VBAT, VSYS, REGN, TS_BAT, IBUS, IBAT, TEMP_JC INT Output for Communication with Host Through I2C (Watch Dog/Polling Function) Suitable for use in SnPb or Pb-free soldering processes. Copyright © 2021 Richtek Technology Corporation. All rights reserved. DS9466-04 May 2021 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9466 Pin Configuration Marking Information 4S= : Product Code (TOP VIEW) YMDNN : Date Code NC VMID REGN BTST LX LX 4S=YM DNN 24 23 22 21 20 19 VBUS PSEL PG STAT SCL SDA 1 18 2 17 3 16 PGND 4 15 25 5 14 6 13 8 9 10 11 12 INT OTG CEB ILIM TS QON 7 PGND PGND SYS SYS BAT BAT WQFN-24L 4x4 Typical Application Circuit RT9466 Input 4V to 14V 1 VBUS BTST 21 47nF 2.2µF 23 4.7µF LX VMID 1µH 19, 20 To System 10µF 4.7µF 22 SYS BAT 4 698Ω 13, 14 10µF PG REGN STAT 10 ILIM TS 5 2 To I C BUS 15, 16 REGN 4.7µF 3 10µF 6 9 8 2 11 SCL Battery Pack SDA CEB INT OTG QON PSEL 7 12 PGND 17, 18 Below are recommended components information Pin Description Part Number Package Manufacturer VBUS 2.2μF/25V/X5R GRM155R61E225KE11 0402 muRata VMID 4.7μF/25V/X5R GRM188R61E475KE11 0603 muRata BTST 47nF/16V/X5R GRM033R61C473KE84 0201 muRata SYS 10μF/6.3V/X5R GRM185R60J106ME15 0603 muRata BAT 10μF/6.3V/X5R GRM185R60J106ME15 0603 muRata REGN 4.7μF/6.3V/X5R GRM155R60J475ME47 0402 muRata LX 1μH/20% DFE252012F-1R0 2.5 x 2mm TOKO ILIM 698Ω/1% RR0306S-6980-FNH 0201 CYNTEC Copyright © 2021 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9466-04 May 2021 RT9466 Functional Pin Description Pin No. Pin Name Pin Description 1 VBUS Power input. 2 PSEL Power source selection input : High : USB host, IBUS = 500mA; Low : adapter source, IBUS = 3.25A, and ILIM select minimum current value. (Internal pull down 102kΩ) 3 PG Open-drain output. Low if the VBUS voltage is between VUVLO and VBUS_OVP; VBUS is higher than VBAT. VBUS current capability is larger than 50mA. 4 STAT Charge status indication, open-drain output that indicates charge is in progress when held low and charge is finished when held High. If any fault occurs, CHG_STAT will blink at the frequency of 1Hz. Connect a 2.2k-10kΩ pull-up resistor. 5 SCL I2C interface serial clock input. Open-drain. An external pull-up resistor is required 6 SDA I2C interface serial data input/output. Open-drain. An external pull-up resistor is required. 7 INT Interrupt output, active-low open-drain. Indicator of the charger/Boost event for system processor. 8 OTG OTG boost mode enable control, active-high. Act with OTG_PIN_EN (Addr0x01[1]). (Internal pull down 102kΩ) 9 CEB Charger enable input, active-low. (Internal pull down 102kΩ) 10 ILIM Input current limit setting pin. A resistor is connected from ILIM pin to ground to set the maximum input current limit. The actual input current limit is the lower value set through the ILIM pin and IAICR register bits, and PSEL select minimum current value. 11 TS Battery temperature-sense input, connected to a resistor divider for temperature programming. If there is no need for the battery temperature-sense function, a 50kΩ resistor is connected to REGN and another 50kΩ resistor to ground. 12 QON Internal BATFET enable control input. In shipping mode, QON is pulled Low for the duration of tSHIPMODE (typical 0.9s) to exit shipping mode. 13, 14 BAT Charge current output node for battery connection. The internal BATFET is connected between VSYS and BAT. Connect a 10μF ceramic capacitor between BAT and ground. 15, 16 SYS System connection node. The internal BATFET is connected between SYS and BAT. Connect a 20μF ceramic capacitor between SYS and ground. 17, 18 PGND Power ground. 19, 20 LX Switch node for output inductor connection. BTST Bootstrap capacitor connection for high-side gate driver. Connect a capacitor from BTST to LX to power the internal gate driver. 21 Copyright © 2021 Richtek Technology Corporation. All rights reserved. DS9466-04 May 2021 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9466 Pin No. Pin Name Pin Description 22 REGN Regulated output voltage to supply for the PWM low-side gate driver and the bootstrap capacitor. Connect a 4.7μF ceramic capacitor from REGN to GND. 1. If VBUS is plugged in, REGN will be powered by VBUS and regulated to 4.9V. 2. If VBUS is unplugged, the charger will operate in sleep mode and the REGN voltage will be 0V. * For #2. : Since the REGN voltage is also used to power the TS resistor, when the charger is in sleep mode, the REGN will be woken up (be reactivated) if VBAT is greater than forward voltage (VF) of the internal high-side (HS) MOS diode by VSLEEP_EXIT with all function of the internal ADC being activated and I2C R/W. The REGN wake-up time is 500ms. 23 VMID Connection point between the reverse blocking MOSFET and the high-side switching MOSFET. 24 NC No internal connection. PGND Power ground. The exposed pad must be connected to GND and well soldered to a large PCB copper area for maximum power dissipation. 25 (Exposed Pad) Functional Block Diagram REGN VBUS VMID BTST LDO PSEL Input Source Detection UUG Controller Charger/OTG Controller H/L Driver LX Analog Base PGND SYS VBUS Protection VSYS SCL BAT IBUS 2 I C SDA INT Power path Controller ADC IBAT REGN State Machine TS STAT Silicon Temp Detection PG OTG Copyright © 2021 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 CEB ILIM QON is a registered trademark of Richtek Technology Corporation. DS9466-04 May 2021 RT9466 Operation The RT9466 is an integrated single cell Li-ion battery switching charger with power path controller. Base Circuits I2C Controller The key parameters of charging and OTG are programmable through I2C commands. Base circuits provide the internal power, VREGN and reference voltage and bias current. Protection Circuits The protection circuits include the VINOVP, VINUVLO, BATOVP and OTP circuits. The protection circuits turn off the charging when the input power or die temperature is in abnormal level. Buck Regulator for Charging and Boost Regulator as OTG The multi-loop controller controls the operation of charging process and current supply to the system. It also controls the circuits as a Boost converter for OTG applications. Battery Detection The RT9466 is capable of doing the battery absence detection. The detection protects the charger when battery is removed accidentally. Adapter Detection If the poor input power source is connected to the RT9466, the operation will be shut down by the adapter detection. Power Path Management and Control Once the battery voltage increases to a defined system minimum regulation voltage, the internal path between SYS and BAT will be fully turned on. That is, a better charging efficiency can be achieved. When end of charge occurs, the charging will stop and the internal path will be turned off. TS Detection The RT9466 detects the temperature of the battery pack via REGN and TS pins. The REGN pin provides a constant voltage source to drive the voltage divider composed of a pulled-high resister and a NTC resister. The RT9466 reports the sensing results via IRQ and status bits for COLD, COOL, WARM and HOT. Copyright © 2021 Richtek Technology Corporation. All rights reserved. DS9466-04 May 2021 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9466 Absolute Maximum Ratings              (Note 1) Supply Input Voltage, VBUS --------------------------------------------------------------------------------------------Supply Input Voltage, VBUS (Peak