SNVS837B June   2013  – April 2016 LM3263

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 System Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  PWM Operation
      2. 7.3.2  PFM Operation
      3. 7.3.3  Active Current Assist and Analog Bypass (ACB)
      4. 7.3.4  Bypass Operation
      5. 7.3.5  Dynamic Adjustment of Output Voltage
      6. 7.3.6  DC-DC Operating Mode Selection
      7. 7.3.7  Internal Synchronous Rectification
      8. 7.3.8  Current Limit
      9. 7.3.9  Timed Current Limit
      10. 7.3.10 Thermal Overload Protection
      11. 7.3.11 Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Low-Power Mode
      3. 7.4.3 Standby Mode
      4. 7.4.4 Active Mode
      5. 7.4.5 User States
    5. 7.5 Programming
      1. 7.5.1 RFFE Interface
      2. 7.5.2 Supported Command Sequences
      3. 7.5.3 Device Enumeration
      4. 7.5.4 GPO1
      5. 7.5.5 Trigger Registers
      6. 7.5.6 Control Interface Timing Parameters
    6. 7.6 Register Map
  8. 8 Application Information
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Recommended External Components
          1. 8.2.2.1.1 Inductor Selection
          2. 8.2.2.1.2 Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout Considerations
    1. 10.1 Layout Guidelines
      1. 10.1.1 1. Overview
      2. 10.1.2 2. PCB
        1. 10.1.2.1 Energy Efficiency
        2. 10.1.2.2 EMI
      3. 10.1.3 3. Manufacturing Considerations
    2. 10.2 4. Layout Examples
      1. 10.2.1 DC-DC Converter
        1. 10.2.1.1 Star Connection Between VBATT, DC-DC Converter, and PA
          1. 10.2.1.1.1 VBATT Star Connection
    3. 10.3 DSBGA Package Assembly and Use
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 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

2 Applications

  • Smartphones
  • RF PC Cards
  • Tablets, eBook Readers
  • Handheld Radios
  • Battery-Powered RF Devices

3 Description

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 Active Current assist and analog Bypass (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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (MAX)
LM3263 DSBGA (16) 2.049 mm × 2.049 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

LM3263 simplified_schematic.gif