Product Details LM5117PMHX-NOPB is a wide-input synchronous buck controller designed for high-performance step-down DC DC power conversion. The device uses current-mode control and drives external high-side and low-side N-channel MOSFETs, allowing designers to build efficient synchronous buck regulators for applications with high or widely varying input voltages.The controller supports an operating input range from 5.5V to 65V, making it suitable for power systems that require regulation from relatively high input voltages. The wide operating range also provides flexibility for industrial, automotive and distributed power architectures where the input voltage can vary significantly during normal operation.LM5117PMHX-NOPB uses emulated peak current-mode control. This control method provides line feed-forward characteristics and cycle-by-cycle current limiting while simplifying loop compensation. The emulated current ramp also helps the controller maintain reliable PWM operation when very small duty cycles are required at high input voltages.The device provides robust 3.3A peak gate-drive outputs for controlling external power MOSFETs. Adaptive dead-time control helps manage the switching transition between the high-side and low-side MOSFETs, while an optional diode-emulation mode can improve light-load efficiency by enabling discontinuous-mode operation.The output voltage can be programmed from 0.8V, allowing the controller to support a broad range of low-voltage regulated rails. A precision voltage reference with approximately 1.5% accuracy provides the feedback reference for output regulation.LM5117PMHX-NOPB also incorporates an analog current-monitoring function that provides average output-current information to the system. A programmable current limit and hiccup-mode overcurrent protection help protect the external power stage during abnormal load conditions.The switching frequency can be programmed from 50kHz to 750kHz, and the controller can operate from a free-running oscillator or be synchronized within the supported operating conditions. Programmable soft-start and tracking functions provide additional control over output-voltage startup behavior, while programmable line undervoltage lockout helps prevent operation when the input supply is outside the desired range.Additional system features include programmable switchover to an external bias supply and thermal shutdown. These functions provide designers with additional options for improving power-stage efficiency, startup behavior and protection.LM5117PMHX-NOPB is supplied in a 20-pin HTSSOP package with the PWP package designation. The device is specified for an operating temperature range of -40°C to +125°C. The combination of wide input capability, external MOSFET control, current monitoring and configurable switching characteristics makes it suitable for demanding DC DC power-conversion designs.Typical applications include industrial power supplies, distributed power systems, telecom equipment, automotive power electronics and embedded systems. Because LM5117PMHX-NOPB is a controller rather than an integrated power-switch regulator, the external MOSFETs, inductor, current-sensing network and other power-stage components should be selected according to the required input voltage, output voltage, load current, switching frequency and thermal conditions.For production designs, engineers should verify the exact MOSFET configuration, compensation network, current-sensing method, switching frequency, thermal design and protection settings against the latest Texas Instruments documentation.