MAX1566

19-2882; Rev 1; 4/04 KIT ATION EVALU E L B AVAILA Six-Channel, High-Efficiency, Digital Camera Power Supplies General Description 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 MAX1566/MAX1567 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 DCto-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 ...