Overview
The LTC3539EDCB#TRMPBF, produced by Analog Devices Inc., is a high-power synchronous step-up DC/DC converter. This device is designed to operate from input voltages as low as 700mV and is available in an 8-lead 2mm × 3mm DFN package. It features synchronous rectification, which enhances efficiency, especially in low input voltage conditions. The LTC3539 and its variant, LTC3539-2, offer different switching frequencies of 1MHz and 2MHz, respectively, making them versatile for various applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Maximum Duty Cycle | VFB = 1.15V | 87 | 90 | % | |
| Minimum Duty Cycle | VFB = 1.3V | 0 | % | ||
| Switching Frequency | LTC3539 / LTC3539-2 | 0.7 / 1.8 | 1 / 2 | 1.3 / 2.4 | MHz |
| MODE Input High Voltage | 0.88 | V | |||
| MODE Input Low Voltage | 0.3 | V | |||
| SHDN Input High Voltage | 0.88 | V | |||
| SHDN Input Low Voltage | 0.3 | V | |||
| SHDN Input Current | VSHDN = 1.2V / VSHDN = 3.3V | 0.3 / 1 | 1 / 2 | µA | |
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Synchronous Rectification: Enhances efficiency by reducing losses associated with diode rectification.
- Low Input Voltage Operation: Can start up and operate from inputs as low as 700mV.
- High Switching Frequencies: Available in 1MHz and 2MHz versions, allowing for smaller external components and higher efficiency.
- Output Disconnect: Allows the output to be disconnected from the input when the device is in shutdown mode, reducing standby current.
- Compact Package: 8-lead 2mm × 3mm DFN package, suitable for space-constrained applications.
Applications
- Battery-Powered Devices: Ideal for boosting voltage from single-cell batteries to higher voltages required by various components.
- Portable Electronics: Suitable for use in handheld devices, such as smartphones, tablets, and other mobile electronics.
- Industrial and Automotive Systems: Can be used in systems requiring efficient step-up conversion from low voltage sources.
- Energy Harvesting: Useful in applications where energy is harvested from low-voltage sources and needs to be boosted to a higher voltage).
Q & A
- What is the minimum input voltage for the LTC3539?
The LTC3539 can start up and operate from inputs as low as 700mV.
- What are the available switching frequencies for the LTC3539 and LTC3539-2?
The LTC3539 operates at 1MHz, while the LTC3539-2 operates at 2MHz.
- What is the maximum output current of the LTC3539?
The LTC3539 can deliver up to 2A of output current.
- What is the package type and size of the LTC3539?
The LTC3539 is available in an 8-lead 2mm × 3mm DFN package.
- Does the LTC3539 have output disconnect capability?
Yes, the LTC3539 allows the output to be disconnected from the input when in shutdown mode.
- What is the operating temperature range of the LTC3539?
The operating temperature range is from -40°C to 85°C.
- What are some typical applications for the LTC3539?
Typical applications include battery-powered devices, portable electronics, industrial and automotive systems, and energy harvesting.
- How does synchronous rectification improve efficiency in the LTC3539?
Synchronous rectification reduces losses associated with diode rectification, thereby enhancing efficiency, especially in low input voltage conditions.
- Can the LTC3539 be used in high-load current applications?
Yes, but for high-load current applications, using a tantalum capacitor can improve performance.
- Where can I find more detailed specifications and datasheets for the LTC3539?
You can find detailed specifications and datasheets on the official Analog Devices website or through distributors like Digi-Key.
