SLUSBS9A February   2014  – July 2014

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 Handling Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Dynamic Rectifier Control
      2. 9.3.2  Dynamic Power Scaling
      3. 9.3.3  VO_REG and VIREG Calculations
      4. 9.3.4  RILIM Calculations
      5. 9.3.5  Adapter Enable Functionality
      6. 9.3.6  Turning Off the Transmitter
        1. 9.3.6.1 WPC End Power Transfer (EPT)
        2. 9.3.6.2 PMA EOC
      7. 9.3.7  CM_ILIM
      8. 9.3.8  PD_DET and TMEM
      9. 9.3.9  TS, Both WPC and PMA
      10. 9.3.10 I2C Communication
      11. 9.3.11 Input Overvoltage
    4. 9.4 Device Functional Modes
    5. 9.5 Register Maps
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Dual Mode Design (WPC and PMA Compliant) Power Supply 5-V Output With 1-A Maximum Current
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1  Output Voltage Set Point
          2. 10.2.1.2.2  Output and Rectifier Capacitors
            1. 10.2.1.2.2.1 TMEM
          3. 10.2.1.2.3  Maximum Output Current Set Point
          4. 10.2.1.2.4  TERM Resistor
          5. 10.2.1.2.5  Setting LPRB1 and LPRB2 Resistors
          6. 10.2.1.2.6  I2C
          7. 10.2.1.2.7  Communication Current Limit
          8. 10.2.1.2.8  Receiver Coil
          9. 10.2.1.2.9  Series and Parallel Resonant Capacitors
          10. 10.2.1.2.10 Communication, Boot and Clamp Capacitors
        3. 10.2.1.3 Application Curves
      2. 10.2.2 bq51221 Embedded in System Board
      3. 10.2.3 bq51221 Implemented in Back Cover
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Trademarks
    2. 13.2 Electrostatic Discharge Caution
    3. 13.3 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7 Pin Configuration and Functions

YFP
42 Pins
(Top View)
po_SLUSBS9.gif

Pin Functions

PIN TYPE DESCRIPTION
NAME NUMBER
AC1 B1, B2, B3 I AC input power from receiver resonant tank
AC2 B4, B5, B6 I
AD E2 I Adapter sense pin
AD-EN E3 O Push-pull driver for PFET that can pass AD input to the OUT pin; used for adapter mux control
BOOT1 C1 O Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier
BOOT2 C6 O
COMM1 F1 O Open-drain FETs used to communicate with primary by varying reflected impedance
COMM2 F6 O
CLAMP1 E1 O Open-drain FETs used to clamp the secondary voltage by providing low impedance across secondary
CLAMP2 E6 O
CM_ILIM G3 I Enables or disables communication current limit; can be pulled high or low to disable or enable communication current limit
FOD F2 I Input that is used for scaling the received power message
ILIM G2 I/O Output current or overcurrent level programming pin
LPRB 1 F5 O Open drain – active to help drive RECT voltage high at light load on a PMA TX
LPRB 2 G6
OUT D1, D2, D3, D4, D5, D6 O Output pin, used to deliver power to the load
PD_DET G6 O Open drain output that allows user to sense when receiver is on transmitter
PGND A1, A2, A3, A4, A5, A6 — Power and logic ground
RECT C2, C3, C4, C5 O Filter capacitor for the internal synchronous rectifier
SCL E4 I SCL and SDA are used for I2C communication
SDA F4 I
TERM, LPRBEN F3 I Sets termination current as a percentage of IILIM as TERM pin. When TERM resistor is populated, LPRB pins are enabled with appropriate function
TMEM G5 O TMEM allows capacitor to be connected to GND so energy from transmitter ping can be stored to retain memory of state
TS/CTRL G4 I Temperature sense. Can be pulled high to send end power transfer (EPT) or end of charge (EOC) to TX
VIREG E5 I Rectifier voltage feedback
VO_REG G1 I Sets the regulation voltage for output
WPG F5 O Open-drain output that allows user to sense when power is transferred to load