ZHCSCQ7A August   2014  – November 2014 LM3643

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Device Comparison Table
  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 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Flash Mode
      2. 8.3.2 Torch Mode
      3. 8.3.3 IR Mode
    4. 8.4 Device Functioning Modes
      1. 8.4.1 Start-Up (Enabling The Device)
      2. 8.4.2 Pass Mode
      3. 8.4.3 Power Amplifier Synchronization (TX)
      4. 8.4.4 Input Voltage Flash Monitor (IVFM)
      5. 8.4.5 Fault/Protections
        1. 8.4.5.1 Fault Operation
        2. 8.4.5.2 Flash Time-Out
        3. 8.4.5.3 Overvoltage Protection (OVP)
        4. 8.4.5.4 Current Limit
        5. 8.4.5.5 NTC Thermistor Input (Torch/Temp)
        6. 8.4.5.6 Undervoltage Lockout (UVLO)
        7. 8.4.5.7 Thermal Shutdown (TSD)
        8. 8.4.5.8 LED and/or VOUT Short Fault
    5. 8.5 Programming
      1. 8.5.1 Control Truth Table
      2. 8.5.2 I2C-Compatible Interface
        1. 8.5.2.1 Data Validity
        2. 8.5.2.2 Start and Stop Conditions
        3. 8.5.2.3 Transferring Data
        4. 8.5.2.4 I2C-Compatible Chip Address
    6. 8.6 Register Descriptions
      1. 8.6.1  Enable Register (0x01)
      2. 8.6.2  IVFM Register (0x02)
      3. 8.6.3  LED1 Flash Brightness Register (0x03)
      4. 8.6.4  LED2 Flash Brightness Register (0x04)
      5. 8.6.5  LED1 Torch Brightness Register (0x05)
      6. 8.6.6  LED2 Torch Brightness Register (0x06)
      7. 8.6.7  Boost Configuration Register (0x07)
      8. 8.6.8  Timing Configuration Register (0x08)
      9. 8.6.9  TEMP Register (0x09)
      10. 8.6.10 Flags1 Register (0x0A)
      11. 8.6.11 Flags2 Register (0x0B)
      12. 8.6.12 Device ID Register (0x0C)
      13. 8.6.13 Last Flash Register (0x0D)
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Capacitor Selection
        2. 9.2.2.2 Input Capacitor Selection
        3. 9.2.2.3 Inductor Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 器件支持
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 相关文档
      1. 12.2.1 相关链接
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 术语表
  13. 13机械、封装和可订购信息

6 Pin Configuration and Functions

YFF Package
12-Pin DSBGA
LM3643 LM3643A 30171802.gif

Pin Functions

PIN DESCRIPTION
NUMBER NAME
A1 GND Input voltage connection. Connect IN to the input supply and bypass to GND with a 10-µF or larger ceramic capacitor.
A2 IN Serial data input/output in the I2C Mode on LM3643.
A3 SDA Drain Connection for Internal NMOS and Synchronous PMOS Switches.
B1 SW Active high hardware flash enable. Drive STROBE high to turn on Flash pulse. Internal pulldown resistor of 300 kΩ between STROBE and GND.
B2 STROBE Serial clock input for LM3643.
B3 SCL Step-up DC-DC converter output. Connect a 10-µF ceramic capacitor between this terminal and GND.
C1 OUT Active high enable pin. High = Standby, Low = Shutdown/Reset. Internal pulldown resistor of 300 kΩ between HWEN and GND.
C2 HWEN Torch terminal input or threshold detector for NTC temperature sensing and current scale back.
C3 TORCH/TEMP High-side current source output for flash LED.
D1 LED2 Configurable dual polarity power amplifier synchronization input. Internal pulldown resistor of 300 kΩ between TX and GND.
D2 TX High-side current source output for flash LED.
D3 LED1