Overview
The LM3248TMX/NOPB, produced by Texas Instruments, is a highly efficient and versatile DC/DC converter designed for advanced mobile and RF applications. This device supports both boost-buck and buck (boost-bypass) operating modes, making it ideal for dynamic voltage and current requirements in modern RF front-end systems. It operates over a wide input voltage range of 2.7V to 5.5V and can deliver an adjustable output voltage from 0.4V to 4.0V with a maximum load current of 2.5A. The LM3248 is particularly suited for multi-mode 2G/3G/4G and 3GPP/LTE smartphones, tablets, and other handheld radio devices, offering high conversion efficiency and fast transient response.
Key Specifications
| Parameter | Description |
|---|---|
| Input Voltage Range | 2.7V to 5.5V |
| Output Voltage Range | 0.4V to 4.0V |
| Maximum Load Current | 2.5A |
| Conversion Efficiency | > 90% (typ.) |
| Operating Modes | Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) |
| Package Type | 30-bump, lead-free thin DSBGA |
| Junction Temperature | +150°C |
| Storage Temperature Range | −65°C to +150°C |
| ESD Rating | Human Body Model 2 kV |
Key Features
- High-efficiency PFM/PWM modes for optimal power management
- Seamless transition between PWM and PFM modes for high efficiency in both full and light load conditions
- Very fast transient response of 10 µs
- Active Current Balance (ACB) to reduce inductor size requirements
- Dither feature to aid RX band noise compliance
- Boost-buck and buck (boost-bypass) operating modes
- Adjustable output voltage and high load current capability
Applications
- Multi-mode 2G/3G/4G and 3GPP/LTE smartphones and tablets
- Handheld radios
- RF mobile devices
- Advanced RF front-end systems requiring dynamic voltage and current support
Q & A
- What is the input voltage range of the LM3248? The input voltage range is from 2.7V to 5.5V.
- What is the maximum load current of the LM3248? The maximum load current is 2.5A.
- What are the operating modes of the LM3248? The LM3248 operates in Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes.
- What is the typical conversion efficiency of the LM3248? The typical conversion efficiency is greater than 90%.
- What package type is the LM3248 available in? The LM3248 is available in a 30-bump, lead-free thin DSBGA package.
- What are some key applications of the LM3248? Key applications include multi-mode smartphones, tablets, handheld radios, and RF mobile devices.
- How does the LM3248 manage transient responses? The LM3248 has a very fast transient response of 10 µs.
- What feature helps in reducing inductor size requirements in the LM3248? The Active Current Balance (ACB) feature helps in reducing inductor size requirements.
- Does the LM3248 support seamless transition between operating modes? Yes, the LM3248 supports seamless transition between PWM and PFM modes.
- What is the ESD rating of the LM3248? The ESD rating is 2 kV according to the Human Body Model.
