Micrel Inc. introduced the MIC28511/12/13, a family of pin-compatible high voltage (HV) synchronous step-down switching regulators with integrated power switches capable of providing up to 4 A (MIC28513) output current and a wide input supply range from 4.6 V to 70 V. The MIC28511/12/13 are offered in both Hyper Speed Control™ and HyperLight Load® architectures, which allow for high VIN (low VOUT) operation and ultra-fast transient response while reducing the required output capacitance and providing very good light-load efficiency. These products can be used in wide variety applications including industrial control, power metering, telecom, and medical equipment. The MIC28511/12/13 are currently available in volume quantities with 1,000 quantity pricing starting at $1.49/$1.85/$1.42 respectively.
The MIC28511/12/13 features adjustable output voltage as low as 0.8 V with a guaranteed accuracy of ±1 percent. A constant switching frequency can be programmed from 200 kHz to 680 kHz thereby allowing the customer increased flexibility in using a small inductor or operating at higher efficiency using lower switching frequency. The MIC28511/12/13 offers a full suite of protection features for reliable solutions under fault conditions, including under-voltage lockout to ensure proper operation under power sag conditions, internal soft-start to reduce inrush current, fold-back current limit, "hiccup" mode short-circuit protection, and thermal shutdown. The MIC28511/12/13 devices operate at –40 °C to +125 °C junction temperature range and are offered in very small 24-pin 3 mm × 4 mm FCQFN packages.
