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AW3644CSR

High Efficiency, Dual Independent 1.5A Flash LED Driver

The AW3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The AW3644 utilizes a 2MHz or 4MHz fixed-frequency synchronous boost converter to provide power to the dual 1.5A constant current LED sources. The dual 128 levels current sources provide the flexibility to adjust the current of LED1 and LED2 in Flash/Torch/IR modes. The AW3644 provides three IVFM protection modes to prevent system reset or shutdown under low battery condition. The AW3644 is controlled via an I 2 C - compatible interface. The main features of the AW3644 include: flash/torch current, flash timeout duration, IVFM, TX interrupt, and NTC thermistor monitor. The AW3644 also provides hardware flash and hardware torch pins (STROBE and TORCH/TEMP) to control Flash/Torch events. The 2MHz or 4MHz 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.

Characteristic

l  Support Dual Color Temperature Flash LED Application

l  Dual Independent and Programmable 1.5A LED Current Source

n  Flash11.35mA~1.5A128 levels 11.72mA/level

n  Torch2.55mA~372mA128 levels 2.91mA/level

n  Flash Timeout40ms~1.6s16 levels

n  Flash/Torch/IR Mode

l  High Efficiency: 85%

l  Optimized Flash LED Current During Low Battery Conditions (IVFM)

l  Hardware Strobe Enable (STROBE)

l  Hardware Torch Enable (TORCH/TEMP)

l  Remote NTC Monitoring

l  Synchronization Input for RF Power Amplifier Pulse Events (TX)

l  400kHz I2CAW3644I2C Address=0x63

l  0.4mm PitchCSP-12 Package Compatible with AW3643, AW36413


Datasheet

Application note

Title Type Size Date Download
DS_AW3644_EN_V1.6_High Efficiency, Dual Independent 1.5A Flash LED Driver.pdf PDF 2.55M 2019-01-11
  • LED Channel
    Control Interface
    Flash Current (Max) (A)
    Torch Current (Max) (A)
    Flash Current Accuracy (%)
    Flash Timer (s)
    Indicator mode
    Type
    Package (mm)
  • AW3644CSR

    2
    I2C
    1.5
    0.372
    ±7
    0.04-1.6
    -
    Boost
    WLCSP 1.626X1.332-12B
  • AW3643CSR

    2
    I2C
    1.5
    0.372
    ±7
    0.04-1.6
    -
    Boost
    WLCSP 1.626X1.332-12B
  • AW36413CSR

    2
    I2C
    1.5
    0.372
    ±7
    0.04-1.6
    Boost
    WLCSP 1.626X1.332-12B
  • AW36423FCR

    2
    I2C
    1.0
    0.375
    ±10
    0.04-1.6
    -
    Inductorless
    FCQFN 1.6X1.2-10L
Package form Number of pins Long(mm) Width(mm) Thick(mm) Pin spacing(mm) Heat sink Package drawing
WLCSP 1.626×1.332×0.575-12B 12 1.626 1.332 0.575 0.4 N
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