LTC7151SIV#PBF

LTC7151S is a high-efficiency monolithic synchronous step-down DC-DC regulator built with Silent Switcher 2 low EMI technology. IV stands for industrial temperature grade specification with operating junction temperature ranging from -40°C to +125°C. #PBF means lead-free bulk tray packaging for engineering evaluation, prototype development and small-batch production assembly. The component is housed in a 28-lead thermally enhanced 4mm×5mm LQFN surface-mount package with exposed thermal pad.

This valley current-mode buck converter delivers continuous 15A output current, optimized for high-current point-of-load power rails in industrial, automotive and computing systems. It accepts a wide input voltage range from 3.1V up to 20V, fully compatible with 12V industrial bus voltage, automotive battery supplies and intermediate bus power architectures. The adjustable output voltage spans 0.5V to 5.5V, catering to core power demands of FPGAs, DSPs, microprocessors and ASICs.

Equipped with Analog Devices proprietary Silent Switcher 2 architecture and integrated internal bypass capacitors, the IC greatly suppresses conducted and radiated electromagnetic interference, easing EMI compliance design without extra bulky filtering components. Switching frequency can be programmed between 400kHz and 3MHz via an external resistor, and external clock synchronization is supported to eliminate frequency crosstalk among multiple power supplies. High operating frequency enables adoption of miniature inductors and MLCC capacitors for compact power solution layout.

The device supports PolyPhase multi-phase parallel operation with up to 12 devices working out-of-phase simultaneously. This function cuts input/output ripple current drastically, reduces required capacitance quantity and realizes high-current power delivery for high-performance processors. Differential remote output voltage sensing compensates PCB trace voltage drops precisely, securing tight regulation accuracy near the load terminals.

Built-in programmable soft-start circuit eliminates power-on inrush current; output voltage tracking and power-good monitoring pin facilitate sequential power-up for multi-rail digital systems. The internal 0.5V feedback reference maintains ±1% precision across the full temperature range. Two operation modes are selectable: forced continuous conduction mode for low output ripple, and discontinuous mode for boosted light-load efficiency.

Key power consumption data: typical active quiescent current is 2mA, while shutdown current is limited below 40μA for idle power conservation. Comprehensive protective circuits include cycle-by-cycle peak current limiting, short-circuit foldback protection, hysteretic thermal shutdown and undervoltage lockout, safeguarding the chip against overload, short-circuit and overheating faults under harsh operating conditions. Fast transient response characteristic stabilizes output voltage rapidly during drastic load current fluctuations.

Encapsulated in compact 28-pin LQFN plastic package with central exposed thermal pad, overall dimensions 4mm × 5mm × 0.74mm. The exposed pad provides excellent thermal conduction to dissipate internal heat efficiently under continuous full-load operation and restrain junction temperature rise. Moisture Sensitivity Level is MSL3; all reflow soldering procedures must be completed within 168 hours once the original vacuum packaging is opened. Tray packaging is adopted to satisfy manual circuit debugging, performance verification and small-volume pre-production assembly requirements.

Industrial operating junction temperature range covers -40°C to +125°C, enabling reliable long-term continuous operation inside industrial automation controllers, automotive onboard electronics, network servers and portable high-power test instruments exposed to severe temperature variations and intensive electromagnetic interference environments. Manufactured with lead-free materials, the component complies with global RoHS environmental directives. The highly integrated single-chip architecture minimizes peripheral passive component count, simplifies high-current low-EMI power supply PCB layout and shortens hardware development cycle.

Industrial FPGA, DSP and embedded processor high-current core point-of-load power supplies

Automotive infotainment, advanced driver assistance systems onboard step-down power modules

Server, network switch distributed intermediate bus conversion circuits

High-performance portable industrial data acquisition and fault detection equipment power systems

Telecommunication remote terminal low-noise high-current multi-rail power conversion units