World’s smallest 300-mA buck-boost regulator enables smaller, easier to design power management solutions
The SC630A and SC632A are three-mode charge pumps (1x, 1.5x, 2x) with continuous output currents of 300 mA (SC630A) and 275 mA (SC632A). They are designed using Semtech’s patented, low-noise charge pump technology to provide low EMI solutions compared to inductive boost regulators and are optimized for use in a wide range of applications, including tablets, modems, set top boxes, smart phones, digital cameras, portable media players, multi-LED backlit LCDs, USB On-the-Go, and compact flash/CF+ products.
Buck-boost charge pump regulators increase or decrease voltages incoming from the main power source (input voltage) to meet the output voltage needed by the system components. The SC630A and SC632A are 3.3 V and 5 V buck-boost charge pump regulators that operate as LDO linear regulators when the input is greater than the 3.3 V or 5 V respective output voltages.
When the input is less than the required output voltages, the devices automatically activate the charge pump to provide voltage boost and the headroom needed for voltage regulation.
Both new charge pumps offer a shutdown current of 0.1 µA (typical) and full protection features, including internal soft-start to minimize inrush current, as well as over-current, short-circuit, and over-temperature protection.
The SC630A and SC632A are enhancements to Semtech’s SC630 and SC632 buck-boost charge pump regulators. These “A” version parts offer the same performance as the “non-A” versions, but in a much smaller footprint and with a lower BOM cost. The benefits are achieved via a reduction in input and output capacitor size from 22 µF down to 2.2 µF, by increasing the charge pump frequency to 1MHz and enhancing the dynamic performance of the regulation loop. This reduces the overall design footprint to as small as 10mm2. Both devices come in a low-profile, thermally enhanced 2 x 2 x 0.6 mm MLPQ 8-pin package.
The SC630A and SC632A are available immediately in production quantities and are priced at $0.45 each in 3,000-piece lots. The ordering codes are SC630AULTRT and SC632AULTRT. Evaluation boards (SC630AEVB, SC632AEVB) are also available.
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