LM3644TTYFFR
ActiveDUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER
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LM3644TTYFFR
ActiveDUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER
Technical Specifications
Parameters and characteristics for this part
| Specification | LM3644TTYFFR |
|---|---|
| Applications | Camera Flash |
| Current - Output / Channel | 1.5 A |
| Dimming | I2C |
| Frequency | 2 MHz, 4 MHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 2 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 12-UFBGA, DSBGA |
| Supplier Device Package | 12-DSBGA |
| Topology | Step-Up (Boost) |
| Type | DC DC Regulator |
| Voltage - Supply (Max) | 5.5 V |
| Voltage - Supply (Min) [Min] | 2.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 0.83 | |
| 10 | $ 0.74 | |||
| 25 | $ 0.71 | |||
| 100 | $ 0.58 | |||
| 250 | $ 0.54 | |||
| 500 | $ 0.48 | |||
| 1000 | $ 0.38 | |||
| Digi-Reel® | 1 | $ 0.83 | ||
| 10 | $ 0.74 | |||
| 25 | $ 0.71 | |||
| 100 | $ 0.58 | |||
| 250 | $ 0.54 | |||
| 500 | $ 0.48 | |||
| 1000 | $ 0.38 | |||
| Tape & Reel (TR) | 3000 | $ 0.35 | ||
| 6000 | $ 0.34 | |||
| 15000 | $ 0.32 | |||
| 30000 | $ 0.31 | |||
| Texas Instruments | LARGE T&R | 1 | $ 0.62 | |
| 100 | $ 0.47 | |||
| 250 | $ 0.35 | |||
| 1000 | $ 0.25 | |||
Description
General part information
LM3644 Series
The LM3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3644 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 dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.
Features of the LM3644 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.
Documents
Technical documentation and resources
