LDOs Operate From A Single Supply Rail

Milpitas, Calif. — These low dropout (LDO) linear regulators from California Micro Devices Corp. provide low cost power solutions for digital consumer and computing applications such as set top boxes, digital TVs, network interface cards (NIC) and printers.

The CM3004 delivers up to 1.0 A from an input voltage as low as 1.7 V. It offers both fixed and adjustable outputs, allowing system designers to provide power as low as 1.2 V from a low voltage power supply. Unlike competing low input voltage solutions, the CM3004 operates from a single supply rail, and does not require a higher Bias voltage (Vbias) supply, reducing power consumption and simplifying layout. The CM3065 is pin compatible with the CM3004 and offers up to 2.0 A from an input supply as low as 2.2 V.

The CM3004 is optimized to provide a low cost solution for designers who need to provide power to low voltage system-on-chip (SoC) from a low voltage supply rail, minimizing heat and power dissipation. It operates from 1.7-V to 5.5-V input supply, with a low dropout of 250 mV typical, 450 mV maximum, at 1.0-A load current. The CM3004 offers both fixed and adjustable outputs. When the adjust pin is tied to the voltage out (Vout) pin, it provides a fixed 1.2-V output, and when it is grounded, the device offers a fixed 2.5-V output. The CM3004 is offered in a thermally enhanced 8 lead SOIC package.

The general purpose CM3065 provides up to 2.0 A of current with 360-mV dropout, and operates from a 2.2-V to 5.5-V input supply. Like the CM3004, it offers adjustable and fixed output voltages. It is available in 1.8-V or 2.5-V output versions, both of which also provide a fixed 1.2-V output when the adjust pin is connected to Vout. It is available in two package options, a thermally enhanced 8 lead SOIC package and a 3 lead TO-263.

Both the CM3004 and CM3065 offer suitable line and load regulation and low quiescent current. Both regulators are stable with low equivalent series resistance (ESR) output capacitors. Other key features include current limit protection, thermal overload protection, and reverse current protection in shutdown. Both families are available in lead free packaging options.

The CM3004 and CM3065 are currently sampling. The CM3004 is priced at 67 cents at 10,000 units. The CM3065 is priced at 69 cents for the SOIC package and 86 cents for the TO263 package in same quantities. Volume production for both devices is scheduled for the fourth quarter.

Further information, including data sheets and a product presentation can be found at

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