SNVS875O August   2012  – December 2015 LM3262

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 Timing Requirements
    8. 6.8 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 Circuit Operation
      2. 7.3.2 Internal Synchronous Rectification
      3. 7.3.3 Current Limiting
      4. 7.3.4 Dynamically Adjustable Output Voltage
      5. 7.3.5 Thermal Overload Protection
      6. 7.3.6 Soft Start
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Mode Operation
      2. 7.4.2 Bypass Mode Operation
      3. 7.4.3 ECO Mode Operation
      4. 7.4.4 Sleep Mode Operation
      5. 7.4.5 Shutdown Mode
  8. 8 Application and Implementation
    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 Inductor Selection
          1. 8.2.2.1.1 Method 1
          2. 8.2.2.1.2 Method 2
        2. 8.2.2.2 Capacitor Selection
        3. 8.2.2.3 Setting The Output Voltage
        4. 8.2.2.4 FB
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Energy Efficiency
      2. 10.1.2 EMI
      3. 10.1.3 Manufacturing Considerations
    2. 10.2 Layout Examples
      1. 10.2.1 Component Placement
    3. 10.3 DSBGA 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

  • Operates from a Single Li-Ion Cell (2.5 V to 5.5 V)
  • 6-MHz (Typical) PWM Switching Frequency
  • Adjustable Output Voltage (0.4 V to 3.6 V)
  • 800-mA Maximum Load Capability (up to 1 A in Bypass Mode)
  • High Efficiency (93% Typical at 3.8 VIN, 3.4 VOUT at 500 mA)
  • Automatic ECO/PWM/BP Mode Change
  • Current and Thermal Overload Protection
  • Multi-Function VCON Pin
    (Eliminates Need for Separate BPEN Control)
  • Soft-Start Function
  • Small Chip Inductor in 0805 (2012) Case Size
  • 25-µA (Typical) IQ in Sleep Mode
  • 5-µs (Typical) Rise Time and Fall Time for
    2-V Step
  • 9-Pin DSBGA Package

2 Applications

  • HSUPA, LTE Cellular Phones
  • TD-SCDMA and TD-LTE
  • Hand-Held Radios
  • RF PC Cards
  • Battery-Powered RF Devices
  • USB-Powered Portable Applications

3 Description

The LM3262 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single lithium-ion cell; however, it may be used in many other applications such as USB-powered portable applications. The device 2.5-V to 5.5-V input voltage can be stepped down to an adjustable output voltage range from 0.4 V to 3.6 V. Output voltage is set using a VCON analog input which enables improved RF-stage PA efficiencies.

The LM3262 offers five modes of operation. In pulse width modulation (PWM) mode the device operates at a fixed frequency of 6 MHz (typical), which minimizes RF interference at medium-to-low loads. At light load, the device enters into ECO mode automatically and operates with reduced switching frequency. In ECO mode, the quiescent current is reduced and extends the battery life. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typical). At low-battery condition, bypass mode reduces the voltage dropout to less than 50 mV (typical). The device also features a sleep mode.

The LM3262 is available in a 9-pin, lead-free DSBGA package. A high-switching frequency (6 MHz) allows use of only three tiny surface-mount components: one inductor and two ceramic capacitors.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (MAX)
LM3262 DSGBA (9) 1.51 mm × 1.385 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

LM3262 30168701.gif