High-Current Step-Down DC/DC Converter with MIPI® RF Front-End Interface for RF Power Amplifiers - LM3263


High-Current Step-Down DC/DC Converter with MIPI® RF Front-End Interface for RF Power Amplifiers



The LM3263 is a DC-DC converter optimized for powering multi-mode multi-band RF power amplifiers (PAs) from a single lithium-ion cell. The LM3263 steps down an input voltage from 2.7 V to 5.5 V to a dynamically adjustable output voltage of 0.4 V to 3.6 V. The output voltage is externally programmed through the RFFE Digital Control Interface and is set to ensure efficient operation at all power levels of the RF PA.

When operating in pulse width modulated (PWM) mode, the LM3263 produces a small and predictable amount of output voltage ripple thus meeting the power and stringent spectral-compliance needs of RF PAs with minimal filtering and minimal excess headroom. When operating in PFM mode, the LM3263 enables the lowest current consumption across PA output power level settings and therefore maximizes system efficiency.

The LM3263 has a unique ctive urrent assist and analog ypass (ACB) feature to minimize inductor size without any loss of output regulation for the entire battery voltage and RF output power range, until dropout. ACB provides a parallel current path, when needed, to limit the maximum inductor current to 1.45 A (typical) while still driving a 2.5-A load. The ACB feature also enables operation with minimal dropout voltage.

For all available packages, see the orderable addendum at the end of the data sheet.


  • MIPI RFFE Digital Control Interface
  • Operates from a Single Li-Ion Cell: 2.7 V to 5.5 V
  • Dynamically Adjustable Output Voltage: 0.4 V to 3.6 V (Typical) in PFM and PWM Modes
  • High-Efficiency PFM and PWM Modes With Internal Seamless Transition
  • 2.5-A Maximum Load Current in PWM Mode
  • 2.7 MHz (Typical) Switching Frequency
  • ACB (Reduces Inductor Requirements and Size)
  • Internal Compensation
  • Current and Thermal Overload Protection
  • Very Small Solution Size: Approximately 9.1 mm2

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Parametrics Compare all products in RF DC/DC Converter

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Typ) (kHz)
Special Features
Operating Temperature Range (C)
Approx. Price (US$)
LM3263 LM3243 LM3279
2.7    2.7    2.7   
5.5    5.5    5.5   
0.4    0.4    0.4   
3.6    3.6    4.2   
2.5    2.5    1   
Buck    Buck    Buck-Boost   
ACB    ACB    N/A   
2700    2700    2400   
Adjustable Output
Light Load Efficiency
Adjustable Output
Light Load Efficiency   
Adjustable Output
Light Load Efficiency
Sleep/Standby Mode   
-30 to 90    -30 to 90    -30 to 85   
16DSBGA    16DSBGA    16DSBGA   
0.48 | 1ku    0.45 | 1ku    0.75 | 1ku