AS1973/83

Energy$ense™ Digital Power DC-DC Managers with LED Boost Controller & Dual Sync Bucks

NOT RECOMMENDED FOR NEW DESIGNS

Part of the Akros AS19xx Energy$ense product family, the AS1983/AS1973 are highly integrated, high efficiency triple output PMICs (Power Management ICs) with integrated LED Boost Controller plus Dual Synchronous Bucks for cost and space sensitive LED lighting and system power applications.

Three power outputs are provided; a 3-5.5V input Synchronous LED Boost Controller that provides both external and internal LED dimming design flexibility, and, two Synchronous Buck Regulators with internal Power FETs. All three outputs provide independent delay and soft start timing control and automatically manage both standard and pre-biased power startup. Synchronous spread-spectrum clocking with external PWM clock sync capability is built in for low-noise, low-EMI multi-channel applications.

The AS1983/AS1973 are optimized for high-efficiency, cost and space constrained multi-channel applications. The device family simplifies LED lighting plus power system design with a range of programmable and easy-design features, including system noise and EMI management. Both the AS1983 and AS1973 provide Hardware mode pin controlled operation, and the AS1983 also includes enhanced Software controlled features through an I²C interface.

The AS1983 & AS1973 are available in 5x5mm 32-pin QFN RoHS compliant packages.

Applications

  • Residential Gateways and Femto Cells
  • Wireless LAN & WiMAX access points/CPEs
  • Voice-over-IP (VoIP) phones, CCTV
  • Set-Top Box, PVR, DTV, LCD
  • Infotainment and Automotive accessories
  • Tablets, Thin Clients and Netbooks

Features

Digitally Programmable Power

  • Output 1: High Efficiency Synchronous LED Boost Controller (3-5.5V input)
  • Outputs 2 & 3: High Efficiency Synchronous Buck Regulators with Integrated 2A(rms) Power FETs
  • Synchronized PWM Clocking on all Outputs (pin programmable)

Power Management

  • Pin Programmable Current Limit for each Output
  • Automatic Pre-Bias Output Startup Management
  • Per Output Enable & Soft Start Delay Timing Control
  • Multiple Soft Start Control Applications Supported
    - Independent, Ratiometric, or Coincident
  • Global PGOOD Monitoring
  • Synchronous Spread Spectrum Clocking on all PWMs
  • Input for optional External Synchronization of PWMs
  • External Analog or Digital PWM LED Dimming
  • Pin Programmable UVLO
  • I²C Controlled PWM Dimming (AS1983)
  • Per Converter Input Current Measurement (AS1983)
  • Per Output PGOOD Monitoring (AS1983)
  • Per Output Voltage Margining (AS1983)
  • Per Output CCM/DCM Control (AS1983)
  • Over-Temp Software Monitor (AS1983)
  • 5V µC-Compatible I²C Interface (AS1983)

EMC Compliance and Protection

  • Synchronous Spread Spectrum clocking on all PWMs
  • Over-Current, Under/Over-Voltage and Short-Circuit Protection with Hiccup Mode
  • High-Temperature Warning, Shutdown, and Restart
  • Industrial Temperature Range: -40C to 85C

Block Diagram

AS1983_73

 

Documentation