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Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply

Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply Integrates Ultra-High-Efficiency Step-Up/Step-Down DC-DC Converters Along with Three Auxiliary Step-Up Controllers

Product Details

Key Features

Parametric specs for Multifunction PMICs
VIN (V) (min) 0.7
VIN (V) (max) 5.5
# Step-Down Outputs 1
# Step-Up Outputs 4
VOUT (V) (min) 1.25
VOUT (V) (max) 5
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.19
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Simplified Block Diagram

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Parameters

Parametric specs for Multifunction PMICs
VIN (V) (min) 0.7
VIN (V) (max) 5.5
# Step-Down Outputs 1
# Step-Up Outputs 4
VOUT (V) (min) 1.25
VOUT (V) (max) 5
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.19

Key Features

  • Step-Up DC-to-DC Converter
    • 95% Efficient
    • 3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output Voltage
  • Step-Down DC-to-DC Converter
    • Operate from Battery for 95% Efficient Buck
    • Combine with Step-Up for 90% Efficient Buck- Boost
    • Adjustable Output Down to 1.25V
  • Three Auxiliary PWM Controllers
  • Up to 1MHz Operating Frequency
  • 1µA Shutdown Mode
  • Internal Soft-Start Control
  • Overload Protection
  • Compact 32-Pin, 5mm x 5mm Thin QFN Package

Applications/Uses

  • Digital Still Cameras
  • Digital Video Cameras
  • PDAs

Description

The MAX1565 provides a complete power-supply solution for digital still and video cameras through the integration of ultra-high-efficiency step-up/step-down DC-to-DC converters along with three auxiliary step-up controllers. The MAX1565 is targeted for applications that use either 2 or 3 alkaline or NiMH batteries as well as those using a single lithium-ion (Li+) battery.

The step-up DC-to-DC converter accepts inputs from 0.7V to 5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses internal MOSFETs to achieve 95% efficiency. Adjustable operating frequency facilitates design for optimum size, cost, and efficiency.

The step-down DC-to-DC converter can produce output voltages as low as 1.25V and also utilizes internal MOSFETs to achieve 95% efficiency. An internal soft-start ramp minimizes surge current from the battery. The converter can operate from the step-up output providing buck-boost capability with up to 90% compound efficiency, or it can run directly from the battery if buck- boost operation is not needed.

The MAX1565 features auxiliary step-up controllers that power CCD, LCD, motor actuator, and backlight circuits. The device also features low-cost expandability by supplying power, an oscillator signal, and a reference to the MAX1801 SOT23 slave controller that supports step-up, SEPIC, and flyback configurations. The MAX1565 is available in a space-saving 32-pin thin QFN package.

Simplified Block Diagram

MAX1565: Typical Operating Circuit MAX1565: 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 .