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LDO in HSNT-4(0808) package consumes 0.9?A

Posted: 21 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LDO? voltage regulator? IC? power?

Seiko Instruments Inc. (SII) rolls the S-1313 and S-1312 lead package LDO voltage regulators, which the company claims are the smallest such devices at 0.8mm by 0.8mm by 0.4mm.

The devices feature 850mW power dissipation, thermal shutdown capability, high ripple rejection, and a mere 0.9?A current consumption. The regulators are optimized for use in smart phones, cellular phones, digital cameras, notebook PCs, hearing aids, and other battery operated portable device designs.

Thermal shutdown protection is built-in, automatically protecting the circuit when the junction temperature reaches 150C and restarts regulation when it drops to 120C. Overcurrent protection is also a built-in feature.

Current consumption for the S-1313 is 0.9?A, and for the S-1312, 20?A, extending battery and device operating times, while providing excellent ripple rejection of 75dB (typical). Output voltage is maintained with high accuracy within 1 percent.

Using SII's HSNT-4(0808) ultra-small package, the regulators occupy only one-third the area of conventional SNT-4 package regulators, while enabling automatic visual solder joint inspection, improving manufacturing yields and reliability. The package incorporates a heat sink capable of 850mW dissipation (board size 40 x 40 x 0.8mm, 4 layers, copper ratio 50 percent), providing higher reliability and performance.

The outer lead design also decreases failure rates related to circuit board flexing and mechanical shock. This is particularly important for small consumer devices like smart phones that are subjected to constant use.

Both regulators are also available in SOT-23-5 and SC-82AB packages.

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