LM3279 - 用于 3G 和 4G 射频功率放大器，具有 MIPI(R) RFFE 接口的降压-升压转换器

LM3279是TI德州仪器公司的一款转换器（集成开关）产品，LM3279是用于 3G 和 4G 射频功率放大器，具有 MIPI(R) RFFE 接口的降压-升压转换器，本站介绍了LM3279的封装应用图解、特点和优点、功能等，并给出了与LM3279相关的TI元器件型号供参考。

LM3279 - 用于 3G 和 4G 射频功率放大器，具有 MIPI(R) RFFE 接口的降压-升压转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

MIPI® RFFE Digital Control Interface
High-Efficiency PFM and PWM Modes with Internal Seamless Transition
Operates from a Single Li-Ion Cell: 2.7 V to 5.5 V
Adjustable Output Voltage:
- RFFE Digital Control: 0.4 V to 4.2 V
- Analog Control: 0.5 V to 4.2 V
1-A Maximum Load Capability for VBATT ≥ 3.2 V, VOUT = 3.6 V
2.4-MHz (typ.) Switching Frequency
Seamless Buck-Boost Mode Transition
Fast Output Voltage Transition: 0.8 V to 4 V in 20 µs
High-Efficiency: 95% typ. at VBATT = 3.7 V, VOUT = 3.3 V, at 300 mA
Input Overcurrent Limit
Output Overvoltage Clamp
Internal Compensation

产品应用

3G/4G Smartphones
RF PC Cards
Tablets, eBooks Readers
Battery-Powered RF Devices

产品说明

The LM3279 is a buck-boost DC/DC converter designed to generate output voltages above or below a given input voltage and is particularly suitable for Power Amplifiers operating from single-cell Li-Ion batteries in portable applications.

The LM3279 has four modes of operation: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), standby, and shutdown. During normal conditions, the LM3279 operates in full synchronous PWM mode at 2.4-MHz typical switching frequency, providing seamless transitions between buck and boost operating regimes. Energy-saving PFM mode increases efficiencies and current savings during low-power RF transmission modes. For high-transmit power, the device operates in PWM buck or boost mode, whereas the device can transition between PWM and PFM modes during low-power transmit. The LM3279 can be controlled either via an included MIPI RFFE Digital Control Interface or by using an analog control from an external MCU, offering design flexibility.

The power converter topology enables minimum total solution size by using one small footprint and case size inductor and two surface mount capacitors.

The LM3279 is internally compensated for buck and boost modes of operation thus providing an optimal transient response.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (MAX)
LM3279	DSBGA (16)	2.529 mm x 2.146 mm

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