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Six-Channel, High-Efficiency, Digital Camera Power Supplies

Six-Channel, High-Efficiency, Digital Camera Power Supplies Improve Performance, Component Count, and Size Compared to Conventional Multichannel Controllers in 2-Cell AA, 1-Cell Li+, and Dual-Battery Designs

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 95% Efficient Step-Up DC-to-DC Converter
  • 0.7V Minimum Input Voltage
  • Main DC-to-DC Configurable as Either Step-Up or Step-Down
  • Combine Step-Up and Step-Down for 90% Efficient Boost-Buck
  • 95% Efficient Step-Down for DSP Core
  • Regulate LED Current for Four, Six, or More LEDs
  • Open LED Overvoltage Protection
  • Transformerless Inverting Controller (MAX1567)
  • Three Extra PWM Controllers (Two on the MAX1567)
  • Up to 1MHz Operating Frequency
  • 1µA Shutdown Mode
  • Soft-Start and Overload Protection
  • Compact 40-Pin 6mm x 6mm Thin QFN Package

Applications/Uses

  • Digital Cameras
  • PDAs

Description

The MAX1566/MAX1567 provide a complete powersupply solution for digital cameras. They improve performance, component count, and size compared to conventional multichannel controllers in 2-cell AA, 1-cell lithium-ion (Li+), and dual-battery designs. On-chip MOSFETs provide up to 95% efficiency for critical power supplies, while additional channels operate with external FETs for optimum design flexibility. This optimizes overall efficiency and cost, while also reducing board space.

The MAX1566/MAX1567 include six high-efficiency DC-to-DC conversion channels:

  • Step-up DC-to-DC converter with on-chip power FETs
  • Main DC-to-DC converter with on-chip FETs, configurable to step either up or down
  • Step-down core DC-to-DC converter with on-chip FETs
  • DC-to-DC controller for white LEDs or other output
  • Extra DC-to-DC controller (typically for LCD); two extra controllers on the MAX1566
  • Transformerless inverting DC-to-DC controller (typically for negative CCD bias) on the MAX1567
All DC-to-DC channels operate at one fixed frequency settable from 100kHz to 1MHz to optimize size, cost, and efficiency. Other features include soft-start, power-OK outputs, and overload protection. The MAX1566/MAX1567 are available in space-saving 40-pin thin QFN packages. An evaluation kit is available to expedite designs.

Simplified Block Diagram

MAX1566, MAX1567: Typical Operating Circuit MAX1566, MAX1567: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .