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TI LM3644TTYFFR

Manufacturer
TI
MPN
LM3644TTYFFR
LCSC Part #
C213568
Packaging
DSBGA-12
Customer #
Key Attributes
PWM 2 DC-DC 1.5A 2.5V~5.5V DSBGA-12 LED Drivers RoHS
DatasheetTI LM3644TTYFFR
RoHS Compliance2 documents available
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QtyUnit Price(Reference Only)Total Amount
1+$ 0.3493$ 0.35
10+$ 0.3385$ 3.39
30+$ 0.3293$ 9.88
100+$ 0.3216$ 32.16
Standard Packaging3000/Full Reel
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/LED Drivers
ManufacturerTI
PackagingDSBGA-12
Frequency - Switching2MHz;4MHz
DimmingPWM
Voltage - Input(AC)-
Number of Channels2
TypeDC-DC
Switch tube (built-in/external)Built-in
Output Voltage-
Operating Temperature-40℃~+85℃
Output Current1.5A
FeaturesOver Voltage Protection;Short Circuit Protection;Over-Temperature Protection (OTP)
TopologyBoost
Constant Current Accuracy7%
Voltage - Input(DC)2.5V~5.5V
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Introduction

AI Translation

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 fixedfrequency 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 I2Ccompatible 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℃ to +85℃ ambient temperature range.

Features

AI Translation
  • Dual Independent 1.5-A LED Current Source
  • Programmability
  • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
  • Torch Currents up to 360 mA (LM3644TT)
  • Flash Timeout Values up to 1.6 seconds (LM3644TT)
  • 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 LM3644 (I²C Address = 0x63)

Applications

AI Translation
  • Camera Phone White LED Flash Digital Still Cameras
  • Fire-Alarm Notification Emergency Strobe Lighting
  • Intruder Alert Notification
  • Barcode Scanners Handheld Data Terminals