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L6728AH Datasheet(PDF) 9 Page - STMicroelectronics |
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L6728AH Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 33 page  L6728AH Device description Doc ID 15726 Rev 1 9/33 4 Device description L6728AH is a single-phase PWM controller with embedded high-current drivers that provides complete control logic and protections to realize in an easy and simple way a general DC-DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, with its high level of integration this 10-pin device allows reducing cost and size of the power supply solution also providing real-time PGOOD in a compact VFQFPN10 3x3 mm. L6728AH is designed to operate from a 5 V or 12 V supply. The output voltage can be precisely regulated to as low as 0.8 V with ±1% accuracy over line and temperature variations. The switching frequency is internally set to 600 kHz. This device provides a simple control loop with a voltage-mode error-amplifier. The error- amplifier features a 15 MHz gain-bandwidth product and 8 V/µs slew rate, allowing high regulator bandwidth for fast transient response. To avoid load damages, L6728AH provides over-current protection as well as overvoltage, under voltage and feedback disconnection protection. The over-current trip threshold is programmable by a simple resistor connected from Lgate to GND. Output current is monitored across low-side MOSFET RDS(on), saving the use of expensive and space- consuming sense resistor. Output voltage is monitored through dedicated VSEN pin. L6728AH implements soft-start increasing the internal reference in closed loop regulation. low-side-less feature allows the device to perform soft-start over pre-biased output avoiding high current return through the output inductor and dangerous negative spike at the load side. L6728AH is available in a compact VFDFN10 3 x 3 mm package with exposed pad. |
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