Overview
Features and Benefits
- Step-Up/Step-Down Charge Pumps Generate Fixed 3.3V or 2.5V Outputs
- VIN Range: 1.8V to 5.5V
- Output Current up to 150mA
- Automatic Mode Switching
- Constant Frequency (1.2MHz) Operation in Step-Up Mode
- Low Dropout Regulator Operation in Step-Down Mode
- Low No-Load Quiescent Current: IQ = 65µA
- Built-In Soft-Start Reduces Inrush Current
- Shutdown Disconnects Load from Input
- Shutdown Current < 1µA
- Short-Circuit/Thermal Protection
- Available in a 6-Lead (2mm × 2mm) DFN Package
Product Details
The LTC3240-3.3/LTC3240-2.5 are step-up/step-down charge pump DC/DC converters that produce a fixed regulated output voltage of 3.3V or 2.5V over a wide input voltage range (1.8V to 5.5V).
With input voltages greater than the regulated output voltage the LTC3240 operates as a low dropout regulator. Once the input voltage drops within 100mV of the regulated output voltage the part automatically switches to step-up mode. In step-up mode the LTC3240 operates as a constant frequency (1.2MHz) doubling charge pump.
The LTC3240-3.3/LTC3240-2.5 feature low no load operating current (65µA typical) and ultralow operating current in shutdown (<1µA). Built-in soft-start circuitry prevents excessive inrush current during start-up. Thermal shutdown and current-limit circuitry allow the parts to survive a continuous short-circuit from VOUT to GND.
The LTC3240-3.3/LTC3240-2.5 require only three tiny external ceramic capacitors for an ultrasmall application footprint. The LTC3240-3.3/LTC3240-2.5 are available in a 6-pin (2mm × 2mm) DFN package.
Applications
- 2 AA to 2.5V
- 2-3 AA/Li-Ion to 3.3V
- Low Power Supplies for Cameras, I/O Supplies, Audio, PC Cards, Misc. Logic, etc., in a Wide Variety of Handheld Products
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
-
R415 Reliability Data3/23/2018
-
DC903A - Demo Manual9/24/2009
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LTC3240-2.5
LTC3240-3.3
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3240EDC-2.5#TRMPBF | Material Declaration | Reliability Data | 6-Lead DFN (2mm x 2mm w/ EP) | |
| LTC3240EDC-2.5#TRPBF | Material Declaration | Reliability Data | 6-Lead DFN (2mm x 2mm w/ EP) | |
| LTC3240EDC-3.3#TRMPBF | Material Declaration | Reliability Data | 6-Lead DFN (2mm x 2mm w/ EP) | |
| LTC3240EDC-3.3#TRPBF | Material Declaration | Reliability Data | 6-Lead DFN (2mm x 2mm w/ EP) | |
| Wafer Fabrication Data | R415 Reliability Data |
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Lead Times
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.