LM3648 LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source | TI.com

LM3648 (ACTIVE)

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

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

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
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
IR Mode    
Input/Output Isolation
Over Current Protection
OVP
Synchronous Rectification    
I2C Control
IR Mode    
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