LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source - LM3648

LM3648 (ACTIVE)

LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source

 

Description

The LM3648 is an LED flash driver that provides a high level of adjustability within a small solution size. The LM3648 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the 1.5-A constant current LED source. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

Features of the LM3648 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers 64 programmable currents in Flash and 128 levels in Movie Mode (Torch) condition.

The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • 1.5-A LED Current Source Programmability
  • Accurate and Programmable LED Current Range from 1.954 mA to 1.5 A
  • Torch Currents up to 500 mA (LM3648TT)
  • Flash Timeout Values up to 1.6 Seconds (LM3648TT)
  • Optimized Flash LED Current During Low Battery Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
  • Grounded Cathode LED Operation for Improved Thermal Management
  • Small Solution Size: < 16 mm2
  • Hardware Strobe Enable (STROBE)
  • Synchronization Input for RF Power Amplifier Pulse Events (TX)
  • Hardware Torch Enable (TORCH/TEMP)
  • Remote NTC Monitoring (TORCH/TEMP)
  • 400-kHz I2C-Compatible Interface
    • LM3648 (I2C Address = 0x63)

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Parametrics Compare all products in Strobe & Flash LED Driver

 
Vin (Min) (V)
Vin (Max) (V)
LED (#)
Iout (Max) (A)
Iq (Typ) (mA)
Features
Operating Temperature Range (C)
Pin/Package
Rating
LM3648 LM3559 LM36010 LM36011 LM3642 LM3643 LM3644
2.5    2.5    2.5    2.5    2.5    2.5    2.5   
5.5    5.5    5.5    5.5    5.5    5.5    5.5   
1    2    1    1    1    2    2   
1.5    1.8    1.5    1.5    1.5    1.5    2.5   
0.3    0.65    0.3    0.3    0.75    0.3    0.3   
I2C Control
IR Mode
LED Thermal Monitor
OVP
Over Current Protection
Synchronous Rectification   
I2C Control
Input/Output Isolation
LED Thermal Monitor
Load Disconnect During Shutdown
OVP
Over Current Protection
Synchronous Rectification   
I2C Control
IR Mode
OVP
Synchronous Rectification   
I2C Control    Input/Output Isolation
Over Current Protection
OVP
Synchronous Rectification   
I2C Control
LED Thermal Monitor
OVP
Over Current Protection
Synchronous Rectification   
I2C Control
IR Mode
LED Thermal Monitor
OVP
Over Current Protection
Synchronous Rectification   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
12DSBGA    16DSBGA    8DSBGA    8DSBGA    9DSBGA    12DSBGA    12DSBGA   
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