1 Features

• Input Voltage: 2.8 V to 5.5 V
• Compatible with Advanced Applications Processors and FPGAs
• Two LDOs for Powering Internal Processor Functions and I/Os
• Precision Internal Reference
• Thermal Overload Protection
• Current Overload Protection
• External Power-On-Reset Function for Buck1 and Buck2
• Undervoltage Lockout Detector to Monitor Input Supply Voltage
• Step-Down DC-DC Converters (Buck)
  • 1.5-A Output Current
  • V_OUT from:
  • Buck1 : 0.8 V to 2 V at 1.5 A
  • Buck2 : 1 V to 3.3 V at 1.5 A
  • Up to 96% efficiency
  • ±3% FB Voltage Accuracy
  • 2-MHz PWM Switching Frequency
  • PWM-to-PFM Automatic Mode Change Under Low Loads
  • Automatic Soft Start
• Linear Regulators (LDO)
  • V_OUT of 1 V to 3.5 V
  • ±3% FB Voltage Accuracy
  • 300-mA Output Current
  • 25-mV (Typical) Dropout

2 Applications

• Core Digital Power
• Applications Processors
• Peripheral I/O Power
• Digital Radios
• Robot Drives
• Image Transmission Module
• Low-Power Digital Applications

3 Description

The LM26480 is a multi-functional power management unit (PMU), optimized for low-power digital applications. This device integrates two highly efficient 1.5-A step-down DC-DC converters and two 300-mA linear regulators. The DC-DC buck converters provide typical efficiencies of 96%, allowing for minimal power consumption. Features include soft start, undervoltage lockout, current overload protection, thermal overload protection, and an internal power-on-reset (POR) circuit, which monitors the output voltage levels on bucks 1 and 2.

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

4 Revision History

Changes from M Revision (December 2016) to N Revision

• Deleted the maximum lead temperature (soldering) from the Absolute Maximum Ratings tableGo
• Changed the PBUCK1 and PBUCK2 equations in the Junction Temperature sectionGo
• Changed the Electrostatic Discharge Caution statement Go

Changes from L Revision (June 2016) to M Revision

• Changed title of data sheet; add content to Description sectionGo
• Deleted SQ-BF option from Table 1 Go

Changes from K Revision (January 2015) to L Revision

• Added additional items to Applications Go
• Changed "θn" to "e_N" as symbol for supply output noise in Low Dropout Regulators EC tableGo

Changes from J Revision (October 2014) to K Revision

• Changed Handling Ratings table to ESD Ratings table Go
• Added full Thermal Information values.Go
• Added additional paragraph to Functional Description subsection to describe enable signal.Go

Changes from I Revision (May 2013) to J Revision

• Added Device Information and ESD Rating tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section. Go