STMicroelectronics has introduced the LDBL20, a 200 mA Low-Dropout (LDO) regulator in a minuscule 0.47 mm × 0.47 mm × 0.2 mm chip-scale package that is ideal for wearable and portable devices and for flexible electronics such as multifunction connected smart cards.
The LDBL20’s bumpless STSTAMP™ package breaks through the minimum I/O-area and height limitation imposed by the diameter of traditional flip-chip solder bumps, enabling unprecedentedly small footprints and low mounted heights. The LDBL20 extends ST’s family of compact LDOs, which includes devices from 2 mm × 2 mm DFN to a 0.69 mm × 0.69 mm CSP with 300 mA output.
In addition to its size advantage, the LDBL20 is an outstanding performer. The 200 mA output makes it as powerful as larger devices from other manufacturers. The input voltage can range from 1.5 V to 5.5 V, with 200 mV typical dropout. Rejection (PSRR) of 80 dB at 100 Hz and 50 dB at 100 kHz simplifies filtering over a wide frequency range to provide a stable rail for low-power circuitry in battery-operated applications. Quiescent current of 20 µA no-load, 100 µA full-load, and 0.3 µA in standby help maximize efficiency under all operating conditions.
A wide range of output voltages is available on request, from 0.8 V up to 5.0 V in 50 mV increments. Designers can also take advantage of built-in features of the LDBL20, which include logic-controlled electronic shutdown, internal soft-start, and support for active output-voltage discharge if required.
An evaluation board for the LDBL20, STEVAL-ISB034V1, is also available, which assists design-in to a wide range of products such as fitness and blood-pressure monitors, glucose meters, hearing aids, wearable sensors, smart headphones, portable audio devices, smart plugs, smart watches, and smartcards.
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| Evaluation board for the LDBL20 high PSRR, miniaturized 200 mA LDO. |
The LDBL20 is in production now, priced from $0.25 for orders of 1,000 pieces.
