Ultra-compact 1 A LDO

10 September 2003 Power Electronics / Power Management

International Rectifier's IRU1502-33 is claimed to be the first fixed PMOS low dropout (LDO) linear regulator in a 6-pin MLPM package with a less than 0,6 V dropout at 1 A full load current. PMOS LDO regulators are excellent candidates for applications that require ultra-low dropout without high quiescent current compared to bipolar pass element transistors. The 6-pin MLPM package (1 x 3 x 3 mm) has a very efficient thermal coefficient of 42°C/W, compared to the SOT-223 package with a thermal coefficient of 53°C/W. The MLPM package is also 50% smaller than SOT-223. Other applications include hard disk drive, CD-ROM, DVD drivers as well as noise sensitive circuitry in RF, audio and DSP, FPGA and microprocessors. The IRU1502-33 features ultra-low noise, fast start-up and superior line and a load (transient) response specification of 1 A/µs. An initial voltage reference with ±2% tolerance over load/line and temperature range (0-120°C) is included, with an ultra-low ground current of 650 µA over the full load range.

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