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  • bq5105xB High-Efficiency Qi v1.2-Compliant Wireless Power Receiver and Battery Charger

    • SLUSB42F July   2012  – June 2017

      PRODUCTION DATA.  

  • CONTENTS
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  • bq5105xB High-Efficiency Qi v1.2-Compliant Wireless Power Receiver and Battery Charger
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
      1. 8.1.1 A Brief Description of the Wireless System
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Using the bq5105x as a Wireless Li-Ion/Li-Pol Battery Charger (With Reference to )
      2. 8.3.2 Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow Diagrams
      3. 8.3.3 Battery Charge Profile
      4. 8.3.4 Battery Charging Process
        1. 8.3.4.1  Precharge Mode (VBAT ≤ VLOWV)
        2. 8.3.4.2  Fast Charge Mode / Constant Voltage Mode
        3. 8.3.4.3  Battery Charge Current Setting Calculations
          1. 8.3.4.3.1 RILIM Calculations
          2. 8.3.4.3.2 Termination Calculations
        4. 8.3.4.4  Battery-Charger Safety and JEITA Guidelines
          1. 8.3.4.4.1 bq51050B and bq51051B JEITA
          2. 8.3.4.4.2 bq51052B Modified JEITA
        5. 8.3.4.5  Input Overvoltage
        6. 8.3.4.6  End Power Transfer Packet (WPC Header 0x02)
        7. 8.3.4.7  Status Output
        8. 8.3.4.8  Communication Modulator
        9. 8.3.4.9  Adaptive Communication Limit
        10. 8.3.4.10 Synchronous Rectification
        11. 8.3.4.11 Internal Temperature Sense (TS Function of the TS/CTRL Pin)
          1. 8.3.4.11.1 TS/CTRL Function
          2. 8.3.4.11.2 Thermal Protection
        12. 8.3.4.12 WPC v1.2 Compatibility
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 bq51050B Used as a Wireless Power Receiver and Li-Ion/Li-Pol Battery Charger
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Series and Parallel Resonant Capacitor Selection
          2. 9.2.1.2.2 COMM, CLAMP and BOOT Capacitors
          3. 9.2.1.2.3 Charging and Termination Current
          4. 9.2.1.2.4 Adapter Enable
          5. 9.2.1.2.5 Charge Indication and Power Capacitors
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Application for Wired Charging
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Blocking Back-Back FET
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RHL|20
  • YFP|28
Thermal pad, mechanical data (Package|Pins)
  • RHL|20
    • QFND077N
Orderable Information
  • slusb42f_oa
  • slusb42f_pm
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DATA SHEET

bq5105xB High-Efficiency Qi v1.2-Compliant Wireless Power Receiver and Battery Charger

1 Features

  • Single-Stage Wireless Power Receiver
    and Li-Ion/Li-Pol Battery Charger
    • Combines Wireless Power Receiver, Rectifier, and Battery Charger in a Single, Small Package
    • 4.20-V, 4.35-V, and 4.40-V Output Voltage Options
    • Supports a Charging Current up to 1.5 A
    • 93% Peak AC-DC Charging Efficiency
  • Robust Architecture
    • 20-V Maximum Input Voltage Tolerance,
      With Input Overvoltage Protection
    • Thermal Shutdown and Overcurrent Protection
    • Temperature Monitoring and Fault Detection
  • Compatible With WPC v1.2 Qi Industry Standard
  • Power Stage Output Tracks Rectifier and Battery Voltage to Ensure Maximum Efficiency Across the Full Charge Cycle
  • Available in Small DSGBA and VQFN Packages

2 Applications

  • Battery Packs
  • Cell Phones and Smart Phones
  • Headsets
  • Portable Media Players
  • Other Handheld Devices

3 Description

The bq5105x device is a high-efficiency, Qi-compliant wireless power receiver with an integrated Li-Ion/Li-Pol battery charge controller for portable applications. The bq5105xB devices provide efficient AC-DC power conversion, integrates the digital controller required to comply with Qi v1.2 communication protocol, and provides all necessary control algorithms needed for efficient and safe Li-Ion and Li-Pol battery charging. Together with the bq500212A transmitter-side controller, the bq5105x enables a complete wireless power transfer system for direct battery charger solutions. By using near-field inductive power transfer, the receiver coil embedded in the portable device can pick up the power transmitted by transmitter coil. The AC signal from the receiver coil is then rectified and conditioned to apply power directly to the battery.  Global feedback is established from the receiver to the transmitter to stabilize the power transfer process.  This feedback is established by using the Qi v1.2 communication protocol.

The bq5105xB devices integrate a low-impedance synchronous rectifier, low-dropout regulator (LDO), digital control, charger controller, and accurate voltage and current loops in a single package.  The entire power stage (rectifier and LDO) use low-resistance N-MOSFETs (100-mΩ typical Rdson) to ensure high efficiency and low power dissipation.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq51050B
bq51051B
bq51052B		 VQFN (20) 4.50 mm × 3.50 mm
DSBGA (28) 3.00 mm × 1.90 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

bq51050B bq51051B bq51052B Pg1Sch.gif

4 Revision History

Changes from E Revision (March 2015) to F Revision

  • Changed all Qi v1.1 and WPC v1.1 To: Qi v1.2 and WPC v1.2 throughout the documentGo
  • Added the Adaptive Communication Limit sectionGo
  • Deleted R1 = 29.402 kΩ R3 = 14.302 kΩ and added a link to SLUS629 in the Internal Temperature Sense (TS Function of the TS/CTRL Pin) section Go

Changes from D Revision (January 2014) to E Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo
  • Added the bq51052B 4.40-V optionGo
  • Updated pinout imagesGo
  • Added thermal pad description in Pin Functions tableGo
  • Added AD voltage to Recommended Operating ConditionsGo
  • Changed RECT overvoltage specification name from VRECT to VOVPGo
  • Changed to ILIM_SHORT, OK from ILIM_SC for clarityGo
  • Added VOREG for bq51052BGo
  • Added minimum current for KILIMGo
  • Changed KILIM TYP value from 300 to 314 (min / max also changed)Go
  • Added IBULK spec for charging minimum and maximumGo
  • Added VRECH for bq51052BGo
  • Added new spec ITerminationGo
  • Changed to VTSB from VTS for clarityGo
  • Changed from ITS-Bias for clarityGo
  • Deleted V0C-F as redundantGo
  • Changed typical JEITA regulation on bq51050B from 4.10 V to 4.06 VGo
  • Changed to clarify CTRL pin high and low levelsGo
  • Changed Thermal shutdown name to TJ-SD for clarityGo
  • Added section to describe Adapter Enable functionGo
  • Changed Synchronous rectifer switchover name to IBAT-SR for clarityGo
  • Added synchronous mode entry for bq51052BGo
  • Deleted note regarding internal junction monitor reducing current - it is not applicable.Go
  • Added section on modified JEITA profile for bq51052BGo
  • Changed TS/CTRL function to correct Termination Packet valueGo
  • Added Taper mode completion for Termination PacketGo
  • Changed Beta value from 4500 to 3380 to match NTC datasheetGo
  • Changed received power maximum error from 250 mW to 375 mW to comply with latest WPC v1.2 specificationGo

Changes from C Revision (February 2013) to D Revision

  • Changed the ABSOLUTE MAXIMUM RATINGS - moved AC1 and AC2 onto a single row with a Min value of –0.8 Go
  • Added section: Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow DiagramsGo
  • Changed text in the Battery Charge Profile sectionGo
  • Changed Battery failure Conditions in Table 1Go
  • Changed Equation 3 and Equation 4Go
  • Changed R2 = 7.81 kΩ To: R1 = 29.402 kΩGo
  • Changed R3 = 13.98 kΩ To: R3 = 14.302 kΩ in the Internal Temperature Sense (TS Function of the TS/CTRL Pin) sectionGo
  • Changed THOT = 0°C To: THOT = 60°CGo
  • Changed Equation 6Go

Changes from B Revision (September 2012) to C Revision

  • First release of the full data sheetGo

Changes from A Revision (August 2012) to B Revision

  • Changed last features bullet from: 1.9 x 3.0mm WCSP and 4.5 x 3.5mm QFN Package Options to: Available in small WCSP and QFN packagesGo
  • Changed Figure 1 and changed caption from: Wireless Power Consortium (WPC or Qi) Inductive Power Charging System, to: Typical System blocks shows bq5105xB used as a Wireless Power Li-Ion/Li-Pol Battery ChargerGo
  • Added note: Visit ti.com/wirelesspower for product details and design resourcesGo

Changes from * Revision (August 2012) to A Revision

  • Changed Regulated BAT(output) voltageGo
  • Changed Recharge threshold for bq51052BGo
  • Deleted ITS-Bias-MaxGo
  • Changed VCOLD to VOC and valuesGo
  • Changed V45C valuesGo
  • Changed V60C valuesGo
  • Changed Figure 25Go
  • Changed Figure 25Go

5 Device Options

DEVICE FUNCTION VRECT-OVP VRECT-REG VBAT-REG NTC MONITORING
bq51050B 4.20-V Li-Ion Wireless Battery Charger 15 V Track 4.20 V JEITA
bq51051B 4.35-V Li-Ion Wireless Battery Charger 15 V Track 4.35 V JEITA
bq51052B 4.40-V Li-Ion Wireless Battery Charger 15 V Track 4.40 V Modified JEITA

6 Pin Configuration and Functions

YFP Package
28-Pin DSBGA
Top View
RHL Package
20-Pin VQFN With Exposed Thermal Pad
Top View
The exposed thermal pad should be connected to ground.

Pin Functions

Pin I/O DESCRIPTION
NAME DSBGA VQFN
AC1 B3, B4 2 I Input power from receiver coil.
AC2 B1, B2 19 I Input power from receiver coil.
AD G4 9 I If AD functionality is used, connect this pin to the wired adapter input. When VAD-Pres is applied to this pin wireless charging is disabled and AD_ENn is driven low. Connect a 1-µF capacitor from AD to PGND. If unused, the capacitor is not required and AD should be connected directly to PGND.
AD-EN F3 8 O Push-pull driver for external PFET when wired charging is active. Float if not used.
BAT D1 4 O Output pin, delivers power to the battery while applying the internal charger profile.
D2
D3
D4
BOOT1 C4 3 O Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10-nF ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2.
BOOT2 C1 17 O
CHG F4 7 O Open-drain output – active when BAT is enabled. Float if not used.
CLAMP1 E3 5 O Open-drain FETs which are used for a non-power dissipative overvoltage AC clamp protection. When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will act as a low impedance to protect the device from damage. If used, capacitors are used to connect CLAMP1 to AC1 and CLAMP2 to AC2. Recommended connections are 0.47-µF capacitors.
CLAMP2 E2 16 O
COMM1 E4 6 O Open-drain outputs used to communicate with primary by varying reflected impedance. Connect a capacitor from COMM1 to AC1 and a capacitor from COMM2 to AC2 for capacitive load modulation. For resistive modulation connect COMM1 and COMM2 to RECT through a single resistor. See Communication Modulator for more information.
COMM2 E1 15 O
EN2 G2 11 I Used to set priority between wireless power and wired power. EN2 low enables wired charging source if AD input voltage is present. EN2 high disables wired charging source and wireless power is enabled if present.
FOD F2 14 I Input for the rectified power measurement. See WPC v1.2 Compatibility for details.
ILIM G1 12 I/O Programming pin for the battery charge current. The total resistance from ILIM to PGND (RILIM) sets the charge current. Figure 32 shows RILIM to be R1 + RFOD. Details can be found in Electrical Characteristics and Battery Charge Current Setting Calculations.
PGND A1 1, 20 – Power ground
A2
A3
A4
RECT C2, C3 18 O Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND. Depending on the power levels, the value may be from 4.7 μF to 22 μF.
TERM G3 10 I Input that is used to set the termination threshold. Termination current is the battery current level below which the charge process will cease. The termination current is set as a percentage of the charge current. See Battery Charge Current Setting Calculations for more details.
TS/CTRL F1 13 I Temperature Sense (TS) and Control (CTRL) pin functionality. For the TS functionality connect TS/CTRL to ground through a Negative Temperature Coefficient (NTC) resistor. If an NTC function is not desired, connect to PGND with a 10-kΩ resistor. As a CTRL pin pull low to send end power transfer (EPT) fault to the transmitter or pull up to an internal rail to send EPT termination to the transmitter. See Internal Temperature Sense (TS Function of the TS/CTRL Pin) for more details.
— — PAD — The exposed thermal pad should be connected to ground (PGND).

 
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