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High efficiency step-down dc-dc converter

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX8560/MAX8561/MAX8562 - the first 4MHz, high efficiency, step-down dc-dc converters that provide up to 500mA of continuous current at output voltages as low as 0.6V in tiny SOT23 and thin DFN packages.

These devices are optimised for applications where small size and efficiency are critical. Applications include cell phones, PDAs, digital still cameras (DSC), and wireless LAN.

The MAX8560/MAX8561/MAX8562 utilise a proprietary, hysteric PWM scheme that switches at up to 4MHz.

This user-adjustable switching frequency scheme allows the use of a 1mm-high, 1 microhenrie inductor and tiny low-cost ceramic capacitors, providing a complete solution of less than 19.5mm squared.

No-load quiescent current is only 40 microamps. Low-output ripple minimises the impact on the RF operation of portable communicators, including cell phones, smartphones, and PDA phones.

These devices also include internal soft-start with zero inrush current.

The MAX8560/MAX8561/MAX8562 have an input range of 2.7V to 5.5V for single-cell lithium-ion (Li+), multicell alkaline, or NiMH battery power applications.

The MAX8561 features logic-controlled output-voltage selection, providing two output voltages for dynamic-voltage management (DVM) for the CPU core supply.

To minimize power loss through the inductor in the power-amplifier (PA) applications, the MAX8562 drives an external bypass P-channel FET when in high-power mode.

The MAX8560 is packaged in a 6-pin SOT23, and the MAX8561/MAX8562 are packaged in 3mmx3mm, 8-pin, thin DFN. The MAX8560EVKIT evaluation kit is available to speed designs.

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