Overview
The LM3248TME/NOPB is a high-performance PWM/PFM Boost-Buck DC/DC converter designed by Texas Instruments. This device is optimized for efficient utilization of battery power over a wide voltage range, making it suitable for advanced RF front-end systems. It supports dynamic voltage and current requirements for converged power amplifier architectures operating in 2G/3G/4G and 3GPP/LTE modes. The LM3248 is particularly beneficial in reducing RF power amplifier overhead power dissipation, thereby extending battery talk time in mobile devices.
Key Specifications
| Attribute | Description |
|---|---|
| Input Voltage Range (VIN) | 2.7V to 5.5V |
| Output Voltage Range (VOUT) | 0.4V to 4.0V (typ.) |
| Load Current Capability | Up to 2.5A |
| Conversion Efficiency | > 90% (typ.) |
| Operating Modes | Boost-Buck and Buck (Boost-Bypass) with Seamless Transition |
| Transient Response | 10 µs |
| Package Type | 30-bump, lead-free thin DSBGA |
| Operating Temperature Range | -30°C to 90°C |
Key Features
- Adjustable output voltage from 0.4V to 4.0V (typ.)
- High-efficiency PFM/PWM modes with seamless transition
- Boost-Buck and Buck (Boost-Bypass) operating modes
- Active Current assist and analog Bypass (ACB) feature to minimize inductor size
- Dither to aid RX band noise compliance
- Very fast transient response of 10 µs
- High conversion efficiency (> 90% typ.)
Applications
The LM3248TME/NOPB is primarily designed for advanced RF front-end systems in mobile devices, including:
- Converged power amplifier architectures
- 2G/3G/4G and 3GPP/LTE modes
- Reduced-power CMOS power amplifiers (PAs)
- Mobile phone applications where dynamic voltage and current are required
Q & A
- What is the input voltage range of the LM3248TME/NOPB?
The input voltage range is from 2.7V to 5.5V.
- What is the maximum load current capability of the LM3248TME/NOPB?
The maximum load current capability is up to 2.5A.
- What are the operating modes of the LM3248TME/NOPB?
The device operates in Boost-Buck and Buck (Boost-Bypass) modes with seamless transition.
- What is the typical conversion efficiency of the LM3248TME/NOPB?
The typical conversion efficiency is greater than 90%.
- What is the transient response time of the LM3248TME/NOPB?
The transient response time is 10 µs.
- What package type is the LM3248TME/NOPB available in?
The device is available in a 30-bump, lead-free thin DSBGA package.
- What is the operating temperature range of the LM3248TME/NOPB?
The operating temperature range is from -30°C to 90°C.
- What is the purpose of the ACB feature in the LM3248TME/NOPB?
The ACB (Active Current assist and analog Bypass) feature minimizes inductor size without losing output regulation.
- How does the LM3248TME/NOPB aid in RX band noise compliance?
The device uses dither to aid in RX band noise compliance.
- What are the primary applications of the LM3248TME/NOPB?
The primary applications include advanced RF front-end systems in mobile devices, especially in 2G/3G/4G and 3GPP/LTE modes.
