Overview
The LM3241TLX/NOPB is a 6-MHz, 750-mA miniature, adjustable, step-down DC-DC converter designed by 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 cell with an input voltage range of 2.7 V to 5.5 V and provides 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 and minimal RF interference. It operates in three modes: PWM mode for higher load conditions, Eco-mode for lighter loads to reduce quiescent current and extend battery life, and shutdown mode to minimize battery consumption.
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 Capability | - | 750 | - | mA |
| PWM Switching Frequency | - | 6 | - | MHz |
| Operating Temperature Range | -40 | - | 85 | °C |
| Package Type | - | DSBGA (6-bump) | - | - |
| Package Size | - | 1.50 mm × 1.30 mm | - | - |
Key Features
- Operates from a single Li-Ion cell (2.7 V to 5.5 V)
- Adjustable output voltage (0.6 V to 3.4 V) set using a VCON analog input
- 750-mA maximum load capability
- High efficiency (95% typical at 3.9 V IN, 3.3 V OUT at 500 mA)
- Automatic Eco-mode and PWM mode change
- 6-MHz (typical) PWM switching frequency
- Current overload protection and thermal overload protection
- Soft start function
- Small chip inductor and ceramic capacitors required
Applications
- Battery-powered 3G/4G power amplifiers
- Hand-held radios
- RF PC cards
- Battery-powered RF devices
Q & A
- What is the input voltage range of the LM3241TLX/NOPB? The input voltage range is from 2.7 V to 5.5 V.
- What is the adjustable output voltage range of the LM3241TLX/NOPB? The output voltage can be adjusted from 0.6 V to 3.4 V.
- What is the maximum load capability of the LM3241TLX/NOPB? The maximum load capability is 750 mA.
- What is the typical PWM switching frequency of the LM3241TLX/NOPB? The typical PWM switching frequency is 6 MHz.
- What are the operating modes of the LM3241TLX/NOPB? The device operates in PWM mode, Eco-mode, and shutdown mode.
- How does the LM3241TLX/NOPB extend battery life? The device extends battery life by entering Eco-mode at light-load conditions, reducing quiescent current.
- What type of package does the LM3241TLX/NOPB come in? The device comes in a 6-bump lead-free DSBGA package.
- What are the key protection features of the LM3241TLX/NOPB? The device features current overload protection and thermal overload protection.
- What external components are required for the LM3241TLX/NOPB? Only three small external surface-mount components are required: an inductor and two ceramic capacitors.
- What is the typical efficiency of the LM3241TLX/NOPB? The typical efficiency is 95% at 3.9 V IN, 3.3 V OUT at 500 mA.
