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LTC3218

Features: Low Noise Constant-Frequency Operation Multi-Mode Operation: 1x or 2x Boost Mode Automatic Mode Switching High Output Current: 150mA (Continuous), 400mA (Pulsed) From Li-Ion/Polymer Input 2-Second Flash Current Timeout for LED Protection Automatic Soft-Start Output Disconnect No Inducto...

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SeekIC No. : 004402185 Detail

LTC3218: Features: Low Noise Constant-Frequency Operation Multi-Mode Operation: 1x or 2x Boost Mode Automatic Mode Switching High Output Current: 150mA (Continuous), 400mA (Pulsed) From Li-Ion/Polymer Input...

LTC3218 Data Sheet

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Part Number:
LTC3218
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: 2024/12/21

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Product Details

Description



Features:

Low Noise Constant-Frequency Operation
Multi-Mode Operation: 1x or 2x Boost Mode
Automatic Mode Switching
High Output Current: 150mA (Continuous), 400mA (Pulsed) From Li-Ion/Polymer Input
2-Second Flash Current Timeout for LED Protection
Automatic Soft-Start
Output Disconnect
No Inductors
220m Internal High Side Current Sense Resistor
Single Resistor Programming Capability
Tiny Application Circuit (3mm * 2mm DFN Package, All Components < 1mm High)


Application

LED Torch/Flash Supply for DSCs/Cellphones


Pinout

Connection Diagram


Specifications

VIN to GND ....................................................... 0.3V to 6V
CPO to GND .................................................... 0.3V to 6V
ENF, ENT ............................................. 0.3V to VIN + 0.3V
ICPO, IILED (Note 2) ................................................500mA
CPO Short-Circuit Duration ............................... Indefi nite
Storage Temperature Range ................... 65°C to 125°C
Operating Temperature Range (Note 3) ... 40°C to 85°C


Description

The LTC®3218 is a low-noise, high-current charge pump DC/DC converter capable of driving high current LEDs at up to 400mA from a 2.9V to 4.5V input. A low external parts count (one fl ying capacitor, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3218 ideally suited for small, battery-powered applications.

Built-in soft-start circuitry of LTC3218 prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A built-in 2-second timer protects the LED during fl ash mode.

Output current level of LTC3218 is programmed by an external resistor. LED current is regulated using an internal high side 220m sense resistor. Automatic mode switching optimizes effi ciency by monitoring the voltage across the charge pump and switching modes only when dropout is detected. The part is available in a low profi le 3mm * 2mm 10-lead DFN package.




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