Overview
The LM3241TLE/DRSN is a high-efficiency, adjustable step-down DC-DC converter designed by National Semiconductor, now part of Texas Instruments. This device is optimized for powering RF power amplifiers (PAs) in mobile phones, portable communicators, and other battery-powered RF devices. It operates from a single Li-Ion battery cell with an input voltage range of 2.7 V to 5.5 V and can deliver an adjustable output voltage from 0.6 V to 3.4 V. The LM3241 features a voltage-mode buck architecture with synchronous rectification, ensuring high efficiency across a wide range of power levels.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | - | 5.5 | V |
| Output Voltage Range | 0.6 | - | 3.4 | V |
| Maximum Load Current | - | 750 | - | mA |
| Switching Frequency | - | 6 MHz | - | - |
| Operating Temperature Range | -40 | - | 85 | °C |
| Package Type | - | DSBGA (6) | - | - |
| Package Size | - | 1.50 mm × 1.30 mm | - | - |
Key Features
- High Efficiency: The LM3241 uses a voltage-mode buck architecture with synchronous rectification to achieve high efficiency.
- Adjustable Output Voltage: The output voltage can be dynamically adjusted from 0.6 V to 3.4 V using the analog VCON pin.
- Multiple Operating Modes: The device operates in PWM mode for high load conditions, Eco-mode for light loads to reduce quiescent current, and shutdown mode to minimize battery consumption.
- Current Limiting: Features cycle-by-cycle current limiting to protect the device and external components during overload conditions.
- Compact Design: Requires only three small external surface-mount components (an inductor and two ceramic capacitors) and is available in a small 6-bump DSBGA package.
Applications
The LM3241TLE/DRSN is designed for use in battery-powered RF devices, including:
- Mobile phones
- Portable communicators
- RF power amplifiers (PAs)
- Other battery-powered RF applications requiring high efficiency and adjustable output voltage.
Q & A
- What is the input voltage range of the LM3241TLE/DRSN?
The input voltage range is from 2.7 V to 5.5 V. - What is the adjustable output voltage range of the LM3241TLE/DRSN?
The output voltage can be adjusted from 0.6 V to 3.4 V. - What is the maximum load current capability of the LM3241TLE/DRSN?
The maximum load current is 750 mA. - What are the operating modes of the LM3241TLE/DRSN?
The device operates in PWM mode, Eco-mode, and shutdown mode. - How does the LM3241TLE/DRSN protect against overloads?
The device features cycle-by-cycle current limiting to protect against overloads. - What is the typical switching frequency of the LM3241TLE/DRSN?
The typical switching frequency is 6 MHz. - What is the package type and size of the LM3241TLE/DRSN?
The package type is DSBGA (6) and the size is 1.50 mm × 1.30 mm. - What are the external components required for the LM3241TLE/DRSN?
Only three small external surface-mount components are required: an inductor and two ceramic capacitors. - What is the operating temperature range of the LM3241TLE/DRSN?
The operating temperature range is from -40°C to 85°C. - How does the Eco-mode in LM3241TLE/DRSN help in power management?
In Eco-mode, the device reduces the quiescent current and switching frequency to extend battery life during light-load conditions.
