DC:DC conversion for digital cameras

Today‘s DSCs mainly use a power management unit (PMU) to handle DC power conversion. Switches are typically integrated into the PMU, but Schottky diodes are often used externally due to low power dissipation and process technology.

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Blockdiagram

Key features and benefits

Typical specification: V_R > 30 V, I_F > 500 mA
Ultra-low forward voltage V_F
Small SMD packages

Description

System notes

DSC energy source: 3 or 6 V batteries
- Average standalone energy consumption: 2 W per flash / 500 mW per LCD view
Power management system includes multiple DC/DC converters, supply line switches, and control and status logic
- Different voltages required for image processor, microcontroller, memory (1.8 to 3.3 V), and for CCD image sensor and LCD display (+5, +6.5, +13.5, ±15, or ±7.5 V)
Uses power-sequencing circuit

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DC:DC conversion for digital cameras