SLUSCQ8 May 2017

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (Continued)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Timing Requirements
    7. 7.7Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1 Power-Up from Battery Without DC Source
      2. 8.3.2Power-Up From DC Source
        1. 8.3.2.1CHRG_OK Indicator
        2. 8.3.2.2 Input Voltage and Current Limit Setup
        3. 8.3.2.3 Battery Cell Configuration
        4. 8.3.2.4Device Hi-Z State
      3. 8.3.3USB On-The-Go (OTG)
      4. 8.3.4 Converter Operation
        1. 8.3.4.1 Inductor Setting through IADPT Pin
        2. 8.3.4.2Continuous Conduction Mode (CCM)
        3. 8.3.4.3Pulse Frequency Modulation (PFM)
      5. 8.3.5Current and Power Monitor
        1. 8.3.5.1High-Accuracy Current Sense Amplifier (IADPT and IBAT)
        2. 8.3.5.2High-Accuracy Power Sense Amplifier (PSYS)
      6. 8.3.6Input Source Dynamic Power Manage
      7. 8.3.7Two-Level Adapter Current Limit (Peak Power Mode)
      8. 8.3.8Processor Hot Indication
        1. 8.3.8.1PROCHOT During Low Power Mode
        2. 8.3.8.2PROCHOT Status
      9. 8.3.9Device Protection
        1. 8.3.9.1 Watchdog Timer
        2. 8.3.9.2 Input Overvoltage Protection (ACOV)
        3. 8.3.9.3 Input Overcurrent Protection (ACOC)
        4. 8.3.9.4System Overvoltage Protection (SYSOVP)
        5. 8.3.9.5 Battery Overvoltage Protection (BATOVP)
        6. 8.3.9.6 Battery Short
        7. 8.3.9.7Thermal Shutdown (TSHUT)
    4. 8.4Device Functional Modes
      1. 8.4.1Forward Mode
        1. 8.4.1.1System Voltage Regulation with Narrow VDC Architecture
        2. 8.4.1.2Battery Charging
      2. 8.4.2USB On-The-Go
    5. 8.5Programming
      1. 8.5.1SMBus Interface
        1. 8.5.1.1SMBus Write-Word and Read-Word Protocols
        2. 8.5.1.2Timing Diagrams
    6. 8.6Register Map
      1. 8.6.1 Setting Charge and PROCHOT Options
        1. 8.6.1.1ChargeOption0 Register (SMBus address = 12h) [reset = E20Eh]
        2. 8.6.1.2ChargeOption1 Register (SMBus address = 30h) [reset = 211h]
        3. 8.6.1.3ChargeOption2 Register (SMBus address = 31h) [reset = 2B7]
        4. 8.6.1.4ChargeOption3 Register (SMBus address = 32h) [reset = 0h]
        5. 8.6.1.5ProchotOption0 Register (SMBus address = 33h) [reset = 04A54h]
        6. 8.6.1.6ProchotOption1 Register (SMBus address = 34h) [reset = 8120h]
        7. 8.6.1.7ADCOption Register (SMBus address = 35h) [reset = 2000h]
      2. 8.6.2 Charge and PROCHOT Status
        1. 8.6.2.1ChargerStatus Register (SMBus address = 20h) [reset = 0000h]
        2. 8.6.2.2ProchotStatus Register (SMBus address = 21h) [reset = 0h]
      3. 8.6.3 ChargeCurrent Register (SMBus address = 14h) [reset = 0h]
        1. 8.6.3.1 Battery Pre-Charge Current Clamp
      4. 8.6.4 MaxChargeVoltage Register (SMBus address = 15h) [reset value based on CELL_BATPRESZ pin setting]
      5. 8.6.5 MinSystemVoltage Register (SMBus address = 3Eh) [reset value based on CELL_BATPRESZ pin setting]
        1. 8.6.5.1System Voltage Regulation
      6. 8.6.6 Input Current and Input Voltage Registers for Dynamic Power Management
        1. 8.6.6.1Input Current Registers
          1. 8.6.6.1.1IIN_HOST Register With 10-mΩ Sense Resistor (SMBus address = 3Fh) [reset = 4000h]
          2. 8.6.6.1.2IIN_DPM Register With 10-mΩ Sense Resistor (SMBus address = 022h) [reset = 0h]
          3. 8.6.6.1.3InputVoltage Register (SMBus address = 3Dh) [reset = VBUS-1.28V]
      7. 8.6.7 OTGVoltage Register (SMBus address = 3Bh) [reset = 0h]
      8. 8.6.8 OTGCurrent Register (SMBus address = 3Ch) [reset = 0h]
      9. 8.6.9 ADCVBUS/PSYS Register (SMBus address = 23h)
      10. 8.6.10ADCIBAT Register (SMBus address = 24h)
      11. 8.6.11ADCIINCMPIN Register (SMBus address = 25h)
      12. 8.6.12ADCVSYSVBAT Register (SMBus address = 26h) (reset = )
      13. 8.6.13ID Registers
        1. 8.6.13.1ManufactureID Register (SMBus address = FEh) [reset = 0040h]
        2. 8.6.13.2Device ID (DeviceAddress) Register (SMBus address = FFh) [reset = 0h]
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Input Snubber and Filter for Voltage Spike Damping
        2. 9.2.2.2ACP-ACN Input Filter
        3. 9.2.2.3Inductor Selection
        4. 9.2.2.4Input Capacitor
        5. 9.2.2.5Output Capacitor
        6. 9.2.2.6Power MOSFETs Selection
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
      1. 11.2.1Layout Consideration of Current Path
      2. 11.2.2Layout Consideration of Short Circuit Protection
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Third-Party Products Disclaimer
    2. 12.2Documentation Support
      1. 12.2.1Related Documentation
    3. 12.3Receiving Notification of Documentation Updates
    4. 12.4Community Resources
    5. 12.5Trademarks
    6. 12.6Electrostatic Discharge Caution
    7. 12.7Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • Charge 1- to 4-Cell Battery From Wide Range of Input Sources
    • 3.5-V to 24-V Input Operating Voltage
    • Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD Input Current Settings
    • Seamless Transition Between Buck and Boost Operation
    • Input Current and Voltage Regulation (IDPM and VDPM) Against Source Overload
  • Power/Current Monitor for CPU Throttling
    • Comprehensive PROCHOT Profile, IMVP8 Compliant
    • Input and Battery Current Monitor
    • System Power Monitor, IMVP8 Compliant
  • Narrow-VDC (NVDC) Power Path Management
    • Instant-On With No Battery or Deeply Discharged Battery
    • Battery Supplements System When Adapter is Fully-Loaded
    • Ideal Diode Operation in Supplement Mode
  • Power Up USB Port From Battery (USB OTG)
    • Output 4.48-V to 20.8-V Compatible With USB PD
    • Output Current Limit up to 6.35 A
  • 800-kHz or 1.2-MHz Programmable Switching Frequency for 1-µH to 2.2-µH Low Profile Inductor
  • Host Control Interface for Flexible System Configuration
    • SMBus (bq25700A) Port for Optimal System Performance and Status Reporting
    • Hardware Pin to Set Input Current Limit Without EC Control
  • High Accuracy Regulation and Monitor
    • ±0.5% Charge Voltage Regulation
    • ±2% Input/Charge Current Regulation
    • ±2% Input/Charge Current Monitor
    • ±5% Power Monitor
  • Safety
    • Thermal Shutdown
    • Input, System, Battery Overvoltage Protection
    • MOSFET Inductor Overcurrent Protection
  • Low Battery Quiescent Current
  • Input Current Optimizer (ICO) to Extract Max Input Power
  • Charge Any Battery Chemistry: Li+, LiFePO4, NiCd, NiMH, Lead Acid
  • Package: 32-Pin 4 × 4 WQFN

Applications

  • Ultra-Books, Notebooks, Detachable, and Tablet PCs and Power Bank
  • Industrial and Medical Equipment
  • Portable Equipment With Rechargeable Batteries

Description

The bq25700A is a synchronous NVDC battery buck-boost charge controller, offering low component count, high efficiency solution for space-constraint, multi-chemistry battery charging applications.

The NVDC-1 configuration allows the system to be regulated at battery voltage, but not drop below system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the input source from being overloaded.

The bq25700A charges battery from a wide range of input sources including USB adapter, high voltage USB PD sources and traditional adapters.

Device Information (1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq25700AWQFN (32) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Application Diagram

bq25700A Simp_schem_SLUSCQ8.gif