Ultra-Low Quiescent Current 15-V 800-mA Step Down Synchronous Regulators Improve Power Efficiency and Density for Portable Electronics

The ADP2370/71 offer greater than 93 percent conversion efficiency, enabling designers to support a higher load in a smaller area. During light load conditions, the ADP2370/71 can be configured to automatically switch to a low-quiescent power-save mode for additional battery life savings. The ADP2371, otherwise identical to the ADP2370, also offers a quick output discharge feature to ensure that the output bypass capacitors are completely discharged so that the processor can wake up in a known state.

By using a proprietary, high-speed, current-mode constant frequency PWM control scheme, the ADP2370/71 offer excellent stability and transient response to minimise the output voltage ripple. The switching frequency of these regulators can be synchronised to an external clock to eliminate beat frequencies between regulators. The ADP2370/71 operate over the −40°C to +125°C junction temperature range and are available in compact 3 mm × 3 mm QFN-8 lead packages.

ADP2370/71 DC-to-DC Regulators Key Features
• Wide input voltage range of 3.2 V to 15 V
• Output voltage is adjustable from 0.8 V to input voltage (capable of 100 percent duty cycle operation). Fixed output voltage options are also available: 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5 V.
• Ultra low Iq • Requires only three external components to reduce overall solution size
• Peak efficiency up to 93 percent improves system power efficiency and reduces thermal dissipation
• Synchronisation input to minimise input ripple current and reduce input filter design
• Precision-enable input and power-good feature enable a simple and reliable start-up sequence
• Internal compensation and soft start simplifies design
• Quick output discharge (ADP2371) automatically discharges the output when the device is disabled