LTC3240
LTC3240
PRODUCTION3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter
- Part Models
- 4
- 1ku List Price
- Starting From $2.72
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Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3240EDC-2.5#TRMPBF | 6-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3240EDC-2.5#TRPBF | 6-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3240EDC-3.3#TRMPBF | 6-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3240EDC-3.3#TRPBF | 6-Lead DFN (2mm x 2mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 2
- LTC3240-3.3 Demo Circuit - Step-Up/Step-Down Charge Pump Converter (1.8-5.5V to 3.3V @ 150mA)
- LTC3240-2.5 Demo Circuit - Step-Up/Step-Down Charge Pump Converter (1.8-5.5V to 2.5V @ 60mA)
Models for the following parts are available in LTspice:
- LTC3240-2.5
- LTC3240-3.3
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.
Evaluation Kits
LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA
Resources
LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA
Resources
LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA
Resources
LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA