RT7257DLZSP

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The RT7257DLZSP is a low-power, high-efficiency ultra-small DC/DC buck regulator. It is a switching regulator ideal for use in applications requiring power conversion from medium-high voltages to low output voltages. It features a low noise, fast transient response, and high-efficiency output. The device is designed to maximize the load current step-down efficiency.

The package size of the RT7257DLZSP is a mere 0.76 mm x 0.76 mm x 0.52 mm, making it well suited for space-constrained applications, such as hand-held mobile devices. The system cost can also be reduced due to the small board footprint.

The RT7257DLZSP integrates a high-efficiency, high-speed, buck converter with on-chip low-resistance MOSFET switches. It provides a power conversion of up to 0.8A, with a maximum output voltage of 5V. It also features wide operating voltage range of 2.5V to 5.5V, and output voltage accuracy of ±1%. The regulator features a fast transient response and low output ripple due to its low-ESR bypass mode operation.

The RT7257DLZSP features programmable output voltage, slew rate, and over-current protection for improved stability, safety, and reliability. It includes an active cell balancing scheme for paralleling of two cells, allowing for a more efficient power management of high power density designs.

The RT7257DLZSP is a well-suited solution for power management applications, such as hand-held mobile devices, smart wearables, IoT devices, high power density designs, medical devices, and portable electronics.

The RT7257DLZSP operates in step-down conversion mode. It is capable of buck converting input voltages as high as 5.5V to a regulated output voltage ranging from 0.9V to 5V. The input voltage is compared with the output voltage setpoint by an internal voltage detection loop. That difference is used to actively manage the internal high-side and low-side MOSFET switches and output a regulated voltage.

The device includes several features to enhance output accuracy and protection. These features include on-chip over-voltage protection (OVP), input under-voltage lockout (UVLO), and over-current protection (OCP). The OVP and OCP are implemented through an internal voltage-mode control loop based on the internal current sense and voltage sense, and can provide a current limit of up to 1.2A. The internal current limit reduces the risk of components being damaged in case of over-current conditions.

The RT7257DLZSP is also optimized for low-noise operation through the use of an on-chip noise elimination circuit. This circuit helps to suppress high frequency noise and reduce EMI behavior, which is an important consideration in high-density mobile applications.

In summary, the RT7257DLZSP is an ideal solution for applications requiring efficient power conversion from medium-high voltages to low output voltages. It is well suited for high power density designs, such as hand-held mobile devices, smart wearables, IoT devices, medical devices, and portable electronics.

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