DocumentationDatasheet
Reliability Data
LT Journal
Press Release
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Features
- 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
Typical Application
Description
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.
2x2 DFN-6
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3240EDC-2.5#PBF | DFN | 6 | E | $2.36 | |
| LTC3240EDC-2.5#TRMPBF | DFN | 6 | E | $2.36 | $1.65 |
| LTC3240EDC-2.5#TRPBF | DFN | 6 | E | $2.36 | $1.60 |
| LTC3240EDC-3.3#PBF | DFN | 6 | E | $2.36 | |
| LTC3240EDC-3.3#TRMPBF | DFN | 6 | E | $2.36 | $1.65 |
| LTC3240EDC-3.3#TRPBF | DFN | 6 | E | $2.36 | $1.60 |
| LTC3240EDC-3.3 | DFN | 6 | E | $4.72 | |
| LTC3240EDC-3.3#TR | DFN | 6 | E | $4.72 | $3.20 |
| LTC3240EDC-2.5 | DFN | 6 | E | $4.72 | |
| LTC3240EDC-2.5#TR | DFN | 6 | E | $4.72 | $3.20 |
| LTC3240EDC-3.3#TRM | DFN | 6 | E | $4.72 | $3.30 |
| LTC3240EDC-2.5#TRM | DFN | 6 | E | $4.72 | $3.30 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC903A-A | LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, Vout = 3.3V @ Up to 150mA | $75.00 | |
| DC903A-B | LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, Vout = 2.5V @ Up to 150mA | $75.00 |