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LTC3454

Features: · High Effi ciency: >90% Typical in Torch Mode, >80% in Flash Mode· Wide VIN Range: 2.7V to 5.5V· Up to 1A Continuous Output Current· 3.5% LED Current Programming Accuracy· Internal Soft-Start· Open/Shorted LED Protection· Constant Frequency 1MHz Operation· Zero Shutdown Current· O...

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SeekIC No. : 004402252 Detail

LTC3454: Features: · High Effi ciency: >90% Typical in Torch Mode, >80% in Flash Mode· Wide VIN Range: 2.7V to 5.5V· Up to 1A Continuous Output Current· 3.5% LED Current Programming Accuracy· Internal ...

LTC3454 Data Sheet

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Part Number:
LTC3454
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/23

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Product Details

Description



Features:

· High Effi ciency: >90% Typical in Torch Mode, >80% in Flash Mode
· Wide VIN Range: 2.7V to 5.5V
· Up to 1A Continuous Output Current
· 3.5% LED Current Programming Accuracy
· Internal Soft-Start
· Open/Shorted LED Protection
· Constant Frequency 1MHz Operation
· Zero Shutdown Current
· Overtemperature Protection
· Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package


Application

· Cell Phone Camera Flash
· Cell Phone Torch Lighting
· Digital Cameras
· PDAs
· Misc Li-Ion LED Drivers


Pinout

Connection Diagram


Specifications

VIN, SW1, SW2, VOUT Voltage ..........................0.3V to 6V
V C , EN1, EN2, I SET1, I SET2
Voltage ...................................0.3V to (VIN + 0.3V) or 6V
LED Peak Current .......................................................1.25A
Storage Temperature Range ..................65°C to 125°C
Operating Temperature Range (Note 2) ...40°C to 85°C
Junction Temperature (Note 3) ............................... 125°C


Description

The LTC®3454 is a synchronous buck-boost DC/DC converter optimized for driving a single high power LED at currents up to 1A from a single cell Li-Ion battery input. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode depending on input voltage and LED forward voltage. PLED/PIN effi ciency greater than 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).

LED current of LTC3454 is programmable to one of four levels, including shutdown, with dual external resistors and dual enable inputs. In shutdown no supply current is drawn.

A high constant operating frequency of 1MHz allows the use of small external components. The LTC3454 is offered in a low profi le (0.75mm) thermally enhanced 10-lead (3mm × 3mm) DFN package.




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