LM3648 Texas instruments

LM3648

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LM3648

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Описание

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.

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)

Input voltage type	DC/DC
Topology	Boost, current mode
Vin (min) (V)	2.5
Vin (max) (V)	5.5
Vout (max) (V)	5.5
Vout (min) (V)	2.5
Iout (max) (A)	1.5
Iq (typ) (mA)	0.3
Features	I2C control, IR Mode, LED Thermal Monitor, OVP, Over Current Protection, Synchronous Rectification
Operating temperature range (°C)	-40 to 85
Dimming method	Analog, PWM
Number of channels	1
Rating	Catalog