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Digital Camera Step-Up Power Supply

Complete Power-Supply Solution for Digital Camera Delivers 5 Outputs from 1 Li+ or 2-3 AA Cells

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Digital Camera Step-Up Power Supply Jan 03, 2001

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Key Features

  • +0.7V to +5.5V Input Voltage Range
  • Main DC-DC Converter
    • 95% Efficiency
    • +2.7V to +5.5V Adjustable Output Voltage
    • 1.5A Load Current
  • Uncommitted Gain Block for Linear Regulator
  • Three Independent Auxiliary Step-Up Controllers
    • Adjustable Maximum Duty Cycle
  • Oscillator and Reference Outputs to Drive External Slave Controllers (MAX1801)
  • Power-Ready Output
  • Up to 1MHz Switching Frequency
  • 1µA Supply Current in Shutdown Mode
  • Internal Soft-Start Control
  • Overload Protection for all DC-DC Converters
  • Compact 32-Pin TQFP Package (5mm x 5mm body)

Applications/Uses

  • Digital Still Cameras
  • Digital Video Cameras
  • DVD Players
  • Handheld Devices
  • Internet Access Tablets
  • PDAs

Description

The MAX1800 provides a complete power-supply solution for digital still cameras and video cameras. The device integrates a high-efficiency main step-up DC-DC converter, three auxiliary step-up controllers, and an uncommitted gain block that drives an external P-channel MOSFET for a linear regulator. The MAX1800 is targeted for applications that use either two or three primary cells or a single lithium-ion (Li+) battery.

The main DC-DC converter accepts inputs from +0.7V to +5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses an internal synchronous rectifier to regulate the output with 95% efficiency. An adjustable operating frequency facilitates designs for optimum size, cost, and efficiency.

The auxiliary step-up controllers can be used to power a digital camera's CCD, LCD, and backlight. The MAX1800 also features expandability by supplying power, oscillator signal, and reference to the MAX1801, a low-cost slave DC-DC controller that supports step-up, SEPIC, and fly-back configurations.

The MAX1800 is available in a space-saving 32-pin TQFP package (5mm x 5mm body), and the MAX1801 is available in an 8-pin SOT package. An evaluation kit (MAX1800EVKIT) featuring both devices is available to expedite designs.

Simplified Block Diagram

MAX1800: Typical Operating Circuit MAX1800: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Digital Camera Step-Up Power Supply Jan 03, 2001

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.