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

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.Applications

* Digital Cameras * PDAs

* 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