Charge pump regulators created for use in tablets
Semtech
SC630A and SC632A charge pump regulators
Semtech’s charge pump regulators are optimised for use in tablets, modems, set-top boxes, smart phones, digital cameras, portable media players and multi-LED backlit LCDs, among other applications.
The new 3.3V SC630A and 5V SC632A are said to be the world’s smallest 300 and 275mA (respectively) buck-boost regulators, in a 2 x 2 x 0.6mm package, and are designed to be used with ultra-small 2.2uF capacitors, making them smaller and easier to use than conventional, inductor-based buck-boost regulators.
This combination of tiny package and capacitor sizes results in an overall design footprint as small as 10mm2.
The SC630A and SC632A are three-mode charge pumps (1x, 1.5x, 2x) with continuous output currents of 300 (SC630A) and 275mA (SC632A).
They are designed using Semtech’s patented low-noise charge-pump technology to provide low EMI solutions compared with inductive boost regulators.
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 3.3V and 5V buck-boost charge pump regulators that operate as LDO linear regulators when the input is greater than the 3.3 or 5V 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 0.1uA (typical) and full protection features, including internal soft start to minimise 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 smaller footprint and with a lower BOM cost.
These benefits are achieved via a significant reduction in input and output capacitor size from 22 down to 2.2uF, 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 0.6mm MLPQ 8-pin package.
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