SNVSCV4 September   2024 LM3645

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Power Amplifier Synchronization (TORCH/TX)
      2. 6.3.2 Input Voltage Flash Monitor (IVFM)
      3. 6.3.3 Fault/Protections
        1. 6.3.3.1  Fault Operation
        2. 6.3.3.2  Flash Time-Out
        3. 6.3.3.3  Overvoltage Protection (OVP)
        4. 6.3.3.4  Current Limit
        5. 6.3.3.5  NTC Thermistor Input/Outputs (TEMP1, TEMP2)
        6. 6.3.3.6  Thermal Scale Back
        7. 6.3.3.7  Thermal Shutdown (TSD)
        8. 6.3.3.8  Undervoltage Lockout (UVLO)
        9. 6.3.3.9  LED and/or VOUT Short Fault
        10. 6.3.3.10 Fault Behavior Table
    4. 6.4 Device Functioning Modes
      1. 6.4.1 Flash Mode
      2. 6.4.2 Torch Mode
      3. 6.4.3 IR Mode
      4. 6.4.4 Voltage Mode
      5. 6.4.5 Mode Transitions
      6. 6.4.6 Boost Operation
        1. 6.4.6.1 Start-Up (Enabling The Device)
        2. 6.4.6.2 Pass Mode
        3. 6.4.6.3 Output Voltage Regulation
    5. 6.5 Programming and Control
      1. 6.5.1 Dx_EN Bits
      2. 6.5.2 STR1 and STR2 Usage
      3. 6.5.3 TOR/TX Usage
      4. 6.5.4 Control State Diagram
      5. 6.5.5 I2C-Compatible Interface
        1. 6.5.5.1 Data Validity
        2. 6.5.5.2 Start and Stop Conditions
        3. 6.5.5.3 Transferring Data
        4. 6.5.5.4 I2C-Compatible Chip Address
    6. 6.6 Register Descriptions
      1. 6.6.1 MainReg Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Output Control Examples
        1. 7.2.2.1 Four Channel Flash with Strobe1 Trigger Starting in Standby
        2. 7.2.2.2 Four Channel Flash with Strobe1 Trigger Starting in I2C Torch
        3. 7.2.2.3 Mixed Mode Functionality
        4. 7.2.2.4 Voltage Mode Only
        5. 7.2.2.5 Voltage Mode With Advanced IR
      3. 7.2.3 Detailed Design Procedure
        1. 7.2.3.1 Snubber Requirement
        2. 7.2.3.2 Output Capacitor Selection
        3. 7.2.3.3 Input Capacitor Selection
        4. 7.2.3.4 Inductor Selection
      4. 7.2.4 Application Curves
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Third-Party Products Disclaimer
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

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订购信息

5.5 Electrical Characteristics

Typical limits tested at TA = 25°C. Minimum and maximumlimits apply over the full operating ambient temperature range (−40°C ≤ TA ≤+85°C). Unless otherwise specified, VIN = 3.6 V, EN = 1.8 V,VIO = 1.8 V.(1)(2)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
CURRENT SOURCE
ILED1/2/3/4Current source accuracyVOUT = 4 V, flash code = 0xFF = 2-A flash–7%27%A
VOUT = 4 V, torch code = 0xFF = 360-mA torch–10%36010%mA
ILEDx-MatchCurrent source matching (3)VOUT = 4 V, flash code = 0x40 = 500-mA flash0.5%
VHRLED1, LED2, LED3 and LED4 current source regulation voltageVOUT = 4 V, 1 A < ILED1/2/3/4 ≤ 2 A250mV
VOUT = 4 V, 0 A ≤ ILED1/2/3/4 ≤ 1 A150
STEP-UP DC-DC CONVERTER
RPMOSPMOS switch on-resistance35mΩ
RNMOSNMOS switch on-resistance30mΩ
ICLSwitch current limit00 Setting–12%212%A
01 Setting–12%312%
10 Setting–12%412%
11 Setting–12%512%
VOVPOvervoltage protection thresholdOn threshold5.555.75.85V
Off threshold5.45.65.7
VOUTOutput voltage regulationVM_VOLTAGE = 00, IOUT = 0 A–5%4.05%V
VM_VOLTAGE = 01, IOUT = 0 A–5%4.55%
VM_VOLTAGE = 10, IOUT = 0 A–5%55%
VM_VOLTAGE = 11, IOUT = 0 A–5%5.25%
UVLOUndervoltage lockout thresholdFalling VIN–2%2.22%V
VTRIPNTCx comparator trip threshold–5%0.65%V
INTCNTCx current–6%506%µA
VIVFMInput voltage flash monitor trip threshold–3%2.93%V
IQQuiescent supply currentDevice not switching pass mode (or IR pass mode)0.3201mA
ISDShutdown supply currentDevice disabled, EN = 0 V, SW = VIN
2.5 V ≤ VIN ≤ 5.5 V		0.14µA
ISBStandby supply currentDevice disabled, EN = 1.8 V, SW = VIN
2.5 V ≤ VIN ≤ 5.5 V		1.610µA
EN, TORCH/TX, STR1, STR2 VOLTAGE SPECIFICATIONS
VILInput logic low2.3 V ≤ VIN ≤ 5.5 V00.4V
VIHInput logic high2.3 V ≤ VIN ≤ 5.5 V1.2VINV
I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)
VILInput logic low2.3 V ≤ VIN ≤ 5.5 V00.4V
VIHInput logic high2.3 V ≤ VIN ≤ 5.5 V1.2VINV
VOLOutput logic lowILOAD = 3 mA400mV
(1) Minimum (MIN) and Maximum (MAX) limits are specified by design,test, or statistical analysis. Typical (TYP) numbers are not verified, but do represent the mostlikely norm. Unless otherwise specified, conditions for typical specifications are:VIN = 3.6 V and TA = 25°C.
(2) All voltages are with respect to the potential at the GND pin.
(3) Matching is defined as the greater of the (ILEDMAX - ILEDAVERAGE)/ILEDAVERAGE or |(ILEDMIN-ILEDAVERAGE)|/ILEDAVERAGE
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