LM3643 Dual LED Flash Driver Capable of up to 1.5A | TI.com

LM3643 (ACTIVE) Dual LED Flash Driver Capable of up to 1.5A

 

Description

The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2 ). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5 A (ex: ILED1 = 1.5 A and ILED2 = 0FF, ILED1 = 0FF and ILED2 = 1.5 A, or a current configuration with a current less than 1.5 A , ILED1 = 950 mA and ILED2 = 250 mA). An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3643 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 independently programmable currents in each output leg to drive the LEDs in a Flash or 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.

Features

  • 1.5 A Total Allowed LED Current During Operation
    (ILED1 + ILED2 = 1.5 A)
  • Dual Independent LED Current Source Programmability
  • Accurate and Programmable LED Current Range from
    1.4 mA to 1.5 A
  • Optimized Flash LED Current During Low Battery
    Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (@ 100 mA) and
    Flash Mode (@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
    • LM3643 (I2C Address = 0x63)
    • LM3643A (I2C Address = 0x67)

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) LED (#) Iout (Max) (A) Iq (Typ) (mA) Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3643 Order now 2.5     5.5     2     1.5     0.3     I2C Control
IR Mode    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LM3559 Order now 2.5     5.5     2     1.8     0.65     I2C Control
Input/Output Isolation
LED Thermal Monitor
Load Disconnect During Shutdown
OVP
Over Current Protection
Synchronous Rectification    
-40 to 85     DSBGA | 16     See datasheet (DSBGA)    
LM36010 Order now 2.5     5.5     1     1.5     0.3     I2C Control
IR Mode
OVP
Synchronous Rectification    
-40 to 85     DSBGA | 8     See datasheet (DSBGA)    
LM36011 Order now 2.5     5.5     1     1.5     0.3     I2C Control
IR Mode    
-40 to 85     DSBGA | 8     See datasheet (DSBGA)    
LM3642 Order now 2.5     5.5     1     1.5     0.75     Input/Output Isolation
Over Current Protection
OVP
Synchronous Rectification    
-40 to 85     DSBGA | 9     See datasheet (DSBGA)    
LM3644 Order now 2.5     5.5     2     2.5     0.3     I2C Control
IR Mode
LED Thermal Monitor
OVP
Over Current Protection
Synchronous Rectification    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LM3648 Order now 2.5     5.5     1     1.5     0.3     I2C Control
IR Mode
LED Thermal Monitor
OVP
Over Current Protection
Synchronous Rectification    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)