SNVS796D August   2011  – October 2015 LM3556

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration And Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power-Amplifier Synchronization (TX)
      2. 7.3.2 Input Voltage Flash Monitor (IVFM)
      3. 7.3.3 Fault Protections
        1. 7.3.3.1 Fault Operation
        2. 7.3.3.2 Flash Time-Out
        3. 7.3.3.3 Overvoltage Protection (OVP)
        4. 7.3.3.4 Current Limit
        5. 7.3.3.5 NTC Thermistor Input (TEMP)
        6. 7.3.3.6 Undervoltage Lockout (UVLO)
        7. 7.3.3.7 Thermal Shutdown (TSD)
        8. 7.3.3.8 LED and/or VOUT Fault
    4. 7.4 Device Functional Modes
      1. 7.4.1 Start-Up (Enabling The Device)
      2. 7.4.2 Pass Mode
      3. 7.4.3 Flash Mode
      4. 7.4.4 Torch Mode
      5. 7.4.5 Indicator Mode
    5. 7.5 Programming
      1. 7.5.1 I2C-Compatible Interface
        1. 7.5.1.1 Data Validity
        2. 7.5.1.2 Start and Stop Conditions
        3. 7.5.1.3 Transferring Data
        4. 7.5.1.4 I2C-Compatible Chip Address
        5. 7.5.1.5 Transferring Data
    6. 7.6 Register Maps
      1. 7.6.1 Register Descriptions
        1. 7.6.1.1  Silicon Revision and Filter Time Register (0x00)
        2. 7.6.1.2  Input Voltage Flash Monitor (IVFM) Mode Register (0x01)
        3. 7.6.1.3  NTC Settings Register (0x02)
        4. 7.6.1.4  Indicator Ramp Time Indicator (0x03)
        5. 7.6.1.5  Indicator Blinking Register (0x04)
        6. 7.6.1.6  Indicator Period Count Register (0x05)
        7. 7.6.1.7  Torch Ramp Time Register (0x06)
        8. 7.6.1.8  Configuration Register (0x07)
        9. 7.6.1.9  Flash Features Register (0x08)
        10. 7.6.1.10 Current Control Register (0x09)
        11. 7.6.1.11 Enable Register (0x0A)
          1. 7.6.1.11.1 Enable Register Mode Bits
          2. 7.6.1.11.2 Control Logic Delays
        12. 7.6.1.12 Flags Register (0x0B)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Output Capacitor Selection
        2. 8.2.2.2 Input Capacitor Selection
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 NTC Thermistor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device And Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, And Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

5 Pin Configuration And Functions

YFQ Package
16-Pin DSBGA
Top View
LM3556 30171802.gif

Pin Functions

PIN TYPE DESCRIPTION
NUMBER NAME
A1, B1 LED Power High-side current source output for flash LED. Both pins must be connected for proper operation.
B2, A2 OUT Power Step-up DC-DC converter output. Connect a 10-µF ceramic capacitor between this pin and GND.
B3, A3 SW Power Drain connection for internal NMOS and synchronous PMOS switches.
A4, B4 GND Ground Ground
C1 TEMP Power Threshold detector for LED temperature sensing and current scale back.
C2 TORCH Power Active high hardware torch enable. Drive TORCH high to turn on Torch or Movie mode. Used for external PWM Mode. Has an internal pulldown resistor of 300 kΩ between TORCH and GND.
C3 STROBE I/O Active high hardware flash enable. Drive STROBE high to turn on flash pulse. STROBE overrides TORCH. Has an internal pulldown resistor of 300 kΩ between STROBE and GND.
C4 IN Input Input voltage connection. Connect IN to the input supply, and bypass to GND with a 10-µF or larger ceramic capacitor.
D1 TX I/O Configurable dual polarity power amplifier synchronization input. Has an internal pulldown resistor of 300 kΩ between TX and GND.
D2 SDA I/O Serial data input/output.
D3 SCL Input Serial clock input.
D4 ENABLE Power Active high enable pin. High = standby, low = shutdown/reset. There is no internal pulldown resistor on this pin.