ST662ABN

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ST662ABN is a DC to DC switching regulator from STMicroelectronics which is designed to provide an efficient, cost-effective solution for energy sensitive applications such as low-power processors in automotive, wearable, consumer and other applications. ST662ABN series is a dual step-down synchronous buck regulator with a typical output current of 3A. It belongs to the family of voltage regulators in PMIC category.

ST662ABN adopts advanced power management strategy to reduce system power consumption and extend battery life. It is capable of providing a wide input voltage range from 8V up to 40V, while keeping output voltage low. High frequency switching allows the use of small inductors and capacitors, which helps reduce system component count, size and cost.

The integrated switching regulator can deliver high efficiency, up to 95.4%, making it ideal for applications with high power density requirements. The low quiescent current (9µA) further conserves energy when the device is in full or partial standby mode. The integrated over-current protection, short-circuit protection, and over-temperature protection, ensure safety and long-term reliability.

The ST662ABN series includes an internal-frequency-control PWM controller, MOSFET switches and integrated current sensing circuit. The operating frequency is adjustable via external resistor, while a precise output voltage regulation is achieved by adjusting the internal FB reference voltages.

An integrated soft-start limit avoids current surges, as well as providing stability in transient response. EN and POK pin enables system power-on and power-off control. A low voltage logic signal is user programmable to enable the output channels. Error amplifiers are integrated to provide fast transient response and an over current protection.

By employing a synchronous Rectifying bridge at the output, the ST662ABN series can achieve higher efficiency than other standard buck topologies. The synchronous Rectifying bridge switches provide a low on-state resistance and controlled switching slopes for both output channels, which minimize losses and reduce EMI. The bottom side switch is internal and requires no external component.

The ST662ABN includes advanced features such as Zero Current Detection (ZCD), which enables the regulator to transition from PWM to low quiescent current PFM mode, thus helping to reduce the power consumption in light load conditions. The device provides adjustable soft-start times to ensure a smooth transition from no load conditions to heavy load.

The ST662ABN device also draws a minimum number of external components. The output voltage ripple is minimized by the output capacitors connected externally. The inductor can consist of an inexpensive ferrite core, while the integrated internal compensation capacitors reduce the board layout area.

ST662ABN series DC to DC switching regulator provides a high efficiency, low component count and low power solution. The device is ideally suited for applications such as wearables, consumer and automotive products, where the load currents are low and the power converter must consume minimal power.

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