LDO regulator tackles design tradeoffs
The STLQ020 is aimed at battery-powered consumer products like smartphones and tablets, smart watches, audio or media devices, and wearables. It helps extend battery life in IoT endpoints such as smart meters and wireless sensors, healthcare devices like wearable monitors, and industrial applications such as factory automation or sensor networking.
The LDO draws 300nA quiescent current (Iq), and capable of supplying up to 200mA to the load and is available in a choice of packages down to a 0.8mm x 0.8mm flip-chip. An enable pin puts the device into a shutdown mode that reduces total current consumption to 1 nA.
The device uses adaptive bias circuitry, which ensures fast response and a stable output with power supply rejection ratio (PSRR) of up to 52dB. The dropout voltage of 160mV (typical) at maximum load allows longer equipment runtimes as the battery discharges. Also, with the advantage of its 5nA logic-controlled shutdown mode, the STLQ020 can extend the interval between coin-cell replacements in low-duty-cycle applications like remote sensors.
With an input voltage range of 2.0V-5.5V, the STLQ020 can be powered directly from a suitable battery voltage or logic rail and the output voltage can be set between 0.8V and 4.5V, with either fixed-output or adjustable-output versions available. The fixed output voltages are selectable in 50mV increments.
The STLQ020 is in production now, and available as a 2mm x 2mm DFN6, 0.8mm x 0.8mm flip-chip, or 2.1mm x 2.0mm SOT323-5L, priced from $0.168 for orders of 1000 pieces.
The quad-LDO evaluation board (STEVAL-LDO001V1) based on STLQ020 and 3 other low-dropout (LDO) voltage regulators can be ordered for $9.68.