ZHCSO21 may   2021 BQ25720

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Description (continued)
  7. 6 Device Comparison Table
  8. 7 Pin Configuration and Functions
  9. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Power-Up Sequence
      2. 9.3.2  Vmin Active Protection (VAP) with Battery only
      3. 9.3.3  Two-Level Battery Discharge Current Limit
      4. 9.3.4  Fast Role Swap Feature
      5. 9.3.5  CHRG_OK Indicator
      6. 9.3.6  Input and Charge Current Sensing
      7. 9.3.7  Input Voltage and Current Limit Setup
      8. 9.3.8  Battery Cell Configuration
      9. 9.3.9  Device HIZ State
      10. 9.3.10 USB On-The-Go (OTG)
      11. 9.3.11 Converter Operation
      12. 9.3.12 Inductance Detection Through IADPT Pin
      13. 9.3.13 Converter Compensation
      14. 9.3.14 Continuous Conduction Mode (CCM)
      15. 9.3.15 Pulse Frequency Modulation (PFM)
      16. 9.3.16 Switching Frequency and Dithering Feature
      17. 9.3.17 Current and Power Monitor
        1. 9.3.17.1 High-Accuracy Current Sense Amplifier (IADPT and IBAT)
        2. 9.3.17.2 High-Accuracy Power Sense Amplifier (PSYS)
      18. 9.3.18 Input Source Dynamic Power Management
      19. 9.3.19 Input Current Optimizer (ICO)
      20. 9.3.20 Two-Level Adapter Current Limit (Peak Power Mode)
      21. 9.3.21 Processor Hot Indication
        1. 9.3.21.1 PROCHOT During Low Power Mode
        2. 9.3.21.2 PROCHOT Status
      22. 9.3.22 Device Protection
        1. 9.3.22.1 Watchdog Timer
        2. 9.3.22.2 Input Overvoltage Protection (ACOV)
        3. 9.3.22.3 Input Overcurrent Protection (ACOC)
        4. 9.3.22.4 System Overvoltage Protection (SYSOVP)
        5. 9.3.22.5 Battery Overvoltage Protection (BATOVP)
        6. 9.3.22.6 Battery Discharge Overcurrent Protection (BATOC)
        7. 9.3.22.7 Battery Short Protection (BATSP)
        8. 9.3.22.8 System Undervoltage Lockout (VSYS_UVP) and Hiccup Mode
        9. 9.3.22.9 Thermal Shutdown (TSHUT)
    4. 9.4 Device Functional Modes
      1. 9.4.1 Forward Mode
        1. 9.4.1.1 System Voltage Regulation with Narrow VDC Architecture
        2. 9.4.1.2 Battery Charging
      2. 9.4.2 USB On-The-Go
      3. 9.4.3 Pass Through Mode (PTM)-Patented Technology
    5. 9.5 Programming
      1. 9.5.1 SMBus Interface
        1. 9.5.1.1 SMBus Write-Word and Read-Word Protocols
        2. 9.5.1.2 Timing Diagrams
    6. 9.6 Register Map
      1. 9.6.1  ChargeOption0 Register (SMBus address = 12h) [reset = E70Eh]
      2. 9.6.2  ChargeCurrent Register (SMBus address = 14h) [reset = 0000h]
        1. 9.6.2.1 Battery Pre-Charge Current Clamp
      3. 9.6.3  ChargeVoltage Register (SMBus address = 15h) [reset value based on CELL_BATPRESZ pin setting]
      4. 9.6.4  ChargerStatus Register (SMBus address = 20h) [reset = 0000h]
      5. 9.6.5  ProchotStatus Register (SMBus address = 21h) [reset = B800h]
      6. 9.6.6  IIN_DPM Register With 10-mΩ Sense Resistor (SMBus address = 22h) [reset = 4100h]
      7. 9.6.7  ADCVBUS/PSYS Register (SMBus address = 23h)
      8. 9.6.8  ADCIBAT Register (SMBus address = 24h)
      9. 9.6.9  ADCIINCMPIN Register (SMBus address = 25h)
      10. 9.6.10 ADCVSYSVBAT Register (SMBus address = 26h)
      11. 9.6.11 ChargeOption1 Register (SMBus address = 30h) [reset = 3300h]
      12. 9.6.12 ChargeOption2 Register (SMBus address = 31h) [reset = 00B7]
      13. 9.6.13 ChargeOption3 Register (SMBus address = 32h) [reset = 0434h]
      14. 9.6.14 ProchotOption0 Register (SMBus address = 33h) [reset = 4A81h(2S~) 4A09(1S)]
      15. 9.6.15 ProchotOption1 Register (SMBus address = 34h) [reset = 41A0h]
      16. 9.6.16 ADCOption Register (SMBus address = 35h) [reset = 2000h]
      17. 9.6.17 ChargeOption4 Register (SMBus address = 36h) [reset = 0048h]
      18. 9.6.18 Vmin Active Protection Register (SMBus address = 37h) [reset = 006Ch(2s~4s)/0004h(1s)]
      19. 9.6.19 OTGVoltage Register (SMBus address = 3Bh) [reset = 09C4h]
      20. 9.6.20 OTGCurrent Register (SMBus address = 3Ch) [reset = 3C00h]
      21. 9.6.21 InputVoltage (VINDPM) Register (SMBus address = 3Dh) [reset = VBUS-1.28V]
      22. 9.6.22 VSYS_MIN Register (SMBus address = 3Eh) [reset value based on CELL_BATPRESZ pin setting]
      23. 9.6.23 IIN_HOST Register (SMBus address = 3Fh) [reset = 4100h]
      24. 9.6.24 ID Registers
        1. 9.6.24.1 ManufactureID Register (SMBus address = FEh) [reset = 0040h]
        2. 9.6.24.2 Device ID (DeviceAddress) Register (SMBus address = FFh) [reset = 00E1h]
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 ACP-ACN Input Filter
        2. 10.2.2.2 Inductor Selection
        3. 10.2.2.3 Input Capacitor
        4. 10.2.2.4 Output Capacitor
        5. 10.2.2.5 Power MOSFETs Selection
      3. 10.2.3 Application Curves
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
      1. 12.2.1 Layout Example Reference Top View
      2. 12.2.2 Inner Layer Layout and Routing Example
  14. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方产品免责声明
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 接收文档更新通知
    4. 13.4 支持资源
    5. 13.5 Trademarks
    6. 13.6 静电放电警告
    7. 13.7 术语表
  15. 14Mechanical, Packaging, and Orderable Information

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7 Pin Configuration and Functions

GUID-20200930-CA0I-4XPF-6J1F-XD3MJXFRWDXJ-low.gif Figure 7-1 RSN Package32-Pin WQFNTop View
Table 7-1 Pin Functions
PIN I/O DESCRIPTION
NAME NUMBER
ACN 2 PWR Input current sense amplifier negative input. The leakage on ACP and ACN are matched. A RC low-pass filter is required to be placed between the sense resistor and the ACN pin to suppress the high frequency noise in the input current signal. Refer to Section 10.2.2.1 for ACP/ACN filter design.
ACP 3 PWR Input current sense amplifier positive input. The leakage on ACP and ACN are matched. A RC low-pass filter is required to be placed between the sense resistor and the ACP pin to suppress the high frequency noise in the input current signal. Refer to Section 10.2.2.1 for ACP/ACN filter design.
BATDRV 21 O P-channel battery FET (BATFET) gate driver output. It is shorted to VSYS to turn off the BATFET. It goes 10 V below VSYS to fully turn on BATFET. BATFET is in linear mode to regulate VSYS at minimum system voltage when battery is depleted. BATFET is fully on during fast charge and works as an ideal-diode in supplement mode.
BTST1 30 PWR Buck mode high-side power MOSFET driver power supply. Connect a 0.047-µF capacitor between SW1 and BTST1. The bootstrap diode between REGN and BTST1 is integrated.
BTST2 25 PWR Boost mode high-side power MOSFET driver power supply. Connect a 0.047-μF capacitor between SW2 and BTST2. The bootstrap diode between REGN and BTST2 is integrated.
CELL_BATPRESZ 18 I Battery cell selection pin for 1- to 4- cell battery setting. CELL_BATPRESZ pin is biased from VDDA through a resistor divider. CELL_BATPRESZ pin also sets SYSOVP thresholds to 5 V for 1-cell, 12 V for 2-cell and 19.5 V for 3-cell/4-cell. CELL_BATPRESZ pin is pulled below VCELL_BATPRESZ_FALL to indicate battery removal. After battery is removed the charge voltage register REG0x15h() goes back to default. No external cap is allowed at CELL_BATPRESZ pin. The device exits LEARN mode and disables charge when CELL_BATPRESZ pin is pulled low (upon battery removal).
CHRG_OK 4 O Open drain active high indicator to inform the system good power source is connected to the charger input. Connect to the pullup rail via 10-kΩ resistor. When VBUS rises above 3.5 V and falls below 25.8 V, CHRG_OK is HIGH after 50-ms deglitch time. When VBUS falls below 3.2 V or rises above 26.8 V, CHRG_OK is LOW. When one of SYSOVP, SYSUVP, ACOC, TSHUT, BATOVP, BATOC or force converter off faults occurs, CHRG_OK is asserted LOW.
CMPIN 14 I Input of independent comparator. The independent comparator compares the voltage sensed on CMPIN pin with internal reference, and its output is on CMPOUT pin. Internal reference, output polarity and deglitch time is selectable by the SMBus host. With polarity HIGH (CMP_POL = 1b), place a resistor between CMPIN and CMPOUT to program hysteresis. With polarity LOW (CMP_POL = 0b), the internal hysteresis is 100 mV. If the independent comparator is not in use, tie CMPIN to ground.
CMPOUT 15 O Open-drain output of independent comparator. Place a pullup resistor from CMPOUT to pullup supply rail. Internal reference, output polarity and deglitch time are selectable by the SMBus host. If the independent comparator is not in use, float CMPOUT pin.
COMP2 17 I Buck boost converter compensation pin 2. Refer to Section 9.3.13 for COMP2 pin RC network.
COMP1 16 I Buck boost converter compensation pin 1. Refer to Section 9.3.13 for COMP1 pin RC network.
OTG/VAP/FRS 5 I Active HIGH to enable OTG, VAP or FRS modes. 1) When OTG_VAP_MODE=1b and EN_OTG=1b, pulling high this pin can enable OTG mode. 2) When OTG_VAP_MODE=1b and EN_FRS=1b, pulling high this pin can enable FRS mode in forward operation. 3) When OTG_VAP_MODE=0b, pulling high OTG/VAP/FRS pin is to enable VAP mode.
HIDRV1 31 O Buck mode high-side power MOSFET (Q1) driver. Connect to high-side n-channel MOSFET gate.
HIDRV2 24 O Boost mode high-side power MOSFET(Q4) driver. Connect to high-side n-channel MOSFET gate.
IADPT 8 O The adapter current monitoring output pin. VIADPT = 20 or 40 × (VACP – VACN) with ratio selectable through IADPT_GAIN bit. This pin is also used to program the inductance used in the application. Refer to Section 9.3.12 for selecting resistor from the IADPT pin to ground . For a 2.2-µH inductance, the resistor is 137 kΩ. Place a 100-pF or less ceramic decoupling capacitor from IADPT pin to ground. IADPT output voltage is clamped below 3.3 V.
IBAT 9 O The battery current monitoring output pin. VIBAT = 8 or 16 × (VSRP – VSRN) for charge current, or VIBAT = 8 or 16 × (VSRN – VSRP) for discharge current, with ratio selectable through IBAT_GAIN bit. Place a 100-pF or less ceramic decoupling capacitor from IBAT pin to ground. This pin can be floating if not in use. Its output voltage is clamped below 3.3 V.
ILIM_HIZ 6 I Input current limit setting pin. Program ILIM_HIZ voltage by connecting a resistor divider from VDDA rail to ground. The pin voltage is calculated as: V(ILIM_HIZ) = 1 V + 40 × IDPM × Rac, in which IDPM is the target input current limit.
When EN_EXTILIM = 1b the input current limit used by the charger is the lower setting of ILIM_HIZ pin and IIN_HOST register. When EN_EXTILIM = 0b input current limit is only determined by IIN_HOST register.
When the pin voltage is below 0.4 V, the device enters high impedance (HIZ) mode with low quiescent current. When the pin voltage is above 0.8 V, the device is out of HIZ mode. The ILIM_HIZ pin voltage is continuous read and used for updating current limit setting (If EN_EXTILIM=1b ), this allows dynamic change input current limit setting by adjusting this pin voltage.
LODRV1 29 O Buck mode low side power MOSFET (Q2) driver. Connect to low side n-channel MOSFET gate.
LODRV2 26 O Boost mode low side power MOSFET (Q3) driver. Connect to low side n-channel MOSFET gate.
PGND 27 GND Device power ground.
PROCHOT 11 O Active low open drain output indicator. It monitors adapter input current, battery discharge current, and system voltage. After any event in the PROCHOT profile is triggered, a pulse is asserted. The minimum pulse width is adjustable through PROCHOT_WIDTH bits.
PSYS 10 O Current mode system power monitor. The output current is proportional to the total power from the adapter and the battery. The gain is selectable through SMBus. Place a resistor from PSYS to ground to generate output voltage. This pin can be floating if not in use. Its output voltage is clamped at 3.3 V. Place a capacitor in parallel with the resistor for filtering.
REGN 28 PWR 6-V linear regulator output supplied from VBUS or VSYS. The LDO is active when VBUS above VVBUS_CONVEN. Connect a 2.2- or 3.3-μF ceramic capacitor from REGN to power ground. REGN pin output is for power stage gate drive.
SCL 13 I SMBus clock input. Connect to clock line from the host controller or smart battery. Connect a 10-kΩ pullup resistor according to specifications.
SDA 12 I/O SMBus open-drain data I/O. Connect to data line from the host controller or smart battery. Connect a 10-kΩ pullup resistor according to SMBus specifications.
SRN 19 PWR Charge current sense amplifier negative input. SRN pin is for battery voltage sensing as well. Connect a 0.1-μF filter cap cross battery charging sensing resistor and use 10-Ω contact resistor between SRN pin and battery charging sensing resistor. The leakage current on SRP and SRN are matched.
SRP 20 PWR Charge current sense amplifier positive input. Connect a 0.1-μF filter cap cross battery charging sensing resistor and use 10-Ω contact resistor between SRP pin and battery charging sensing resistor. The leakage current on SRP and SRN are matched.
SW1 32 PWR Buck mode switching node. Connect to the source of the buck half bridge high side n-channel MOSFET.
SW2 23 PWR Boost mode switching node. Connect to the source of the boost half bridge high side n-channel MOSFET.
VBUS 1 PWR Charger input voltage. An input low pass filter of 1 Ω and 0.47 µF (minimum) is recommended.
VDDA 7 PWR Internal reference bias pin. Connect a 10-Ω resistor from REGN to VDDA and a 1-μF ceramic capacitor from VDDA to power ground.
VSYS 22 PWR Charger system voltage sensing. The system voltage regulation maximum limit is programmed in ChargeVoltage register plus 150 mV and regulation minimum limit is programmed in VSYS_MIN register.
Thermal pad – – Exposed pad beneath the IC. Always solder thermal pad to the board, and have vias on the thermal pad plane connecting to power ground planes. It serves as a thermal pad to dissipate the heat.