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The MAX16962 is a high-efficiency, synchronous step-down converter that operates with a 2.7V to 5.5V input voltage range and provides a 0.8V to 3.6V output voltage range. The wide input/output voltage range and the ability to provide up to 4A to load current make this device ideal for on-board point-of-load and post-regulation applications. The MAX16962 achieves -3.7%/+2.6% output error over load, line, and temperature ranges.

MAX16962 – 4A, 2.2MHz, Synchronous Step-Down DC-DC Converter - [Link]

The TPS54160 device is a 60-V, 1.5-A, step down regulator with an integrated high-side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load, regulated output supply current to 116 µA. Using the enable pin, shutdown supply current is reduced to 1.3 µA.

2.5MHz DC/DC converter protect against 65-V transients - [Link]

The LTC®3605A is a high efficiency, monolithic synchronous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC3605A regulators to run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 20V down to 4V, making it suitable for dual, triple or quadruple lithium-ion battery inputs as well as point of load power supply applications from a 12V or 5V rail.

LTC3605A – 20V, 5A Synchronous Step-Down Regulator - [Link]

The LT8610 and LT8611 are 2.5A, 42V input capable synchronous step-down switching regulators. Synchronous rectification delivers efficiency as high as 96% while Burst Mode operation keeps quiescent current under 2.5µA in no-load standby conditions. A 3.4V to 42V input voltage range makes the parts ideal for automotive and industrial applications. Internal 3.5A switches can deliver up to 2.5A of continuous output current to voltages as low as 0.97V. The LT8611 includes all of the features of the LT8610, plus a built-in current sense amplifier with monitor and control pins, enabling accurate input or output current regulation and limiting.

LT8610 – 42V, 2.5A Synchronous Step-Down Regulator - [Link]

LTC3411 from Linear Technology, a 1.25A 4MHz Synchronous Step-Down DC/DC converter. These circuits are really very simple to design, consider a few things and it functioned great.

LTC3411 Synchronous Step-Down DC/DC Converter - [Link]

Power^XR Programmable Power Solutions

A range of serial (I2C) programmable step-down regulators for complex systems with multiple supply voltages.

• 3 or 4 completely independent PWM channels.
• One 3.3/5 V selectable linear LDO regulator.
• Programmable output voltage from 0.9 to 5.1 V.
• Programmable switch frequencies from 0.3 to 1.5 MHz.
• Up to 6 configurable GPIO pins.
• PowerArchitect™ » Free development software.

PowerXR – Programmable switching regulator - [Link]

MAX16974 High-Voltage, 2.2MHz, 2A Automotive Step-Down Converter with Low Operating Current – [via]

• Wide input voltage range (3.5V to 45V) allows seamless operation from cold crank to load dump
• Low quiescent current meets tight power budgets
• High-frequency operation eliminates AM-band radio interference

2A automotive step-down converter - [Link]

Charalampos Andrianakis writes:

The IV-12/11 vfd tubes need 1.2Volt for the filament about 100mA each. In my clock project i’m going to use 6 tubes so the total draw current will be about 600mA which is to much for a linear regulator like LM317. The LM317 can be used, but it will be need a big heat sink to keep it cool. So i designed a step-down converter based on MC34063A, a pulsed regulator, which is also power efficient.

I could have been used a resistor in series with the filament but if any tube filament get burned then the other 5 will draw more current and get burned too. Also i could have been used the AVR to regulate this voltage than using the MC34063A but there wasn’t more free space on the chip.

MC34063A Step-Down Converter 12V to 1.2V 750mA - [Link]

The LTM®4600 is a complete 10A switchmode step-down power supply with a built-in inductor, supporting power components and compensation circuitry. With high integration and synchronous current mode operation, this DC/DC µModuleTM delivers high power at high efficiency in a tiny and low profile surface mount package. Supported by Linear Technology’s rigorous testing and high reliability processes, the LTM4600 simplifies the design and layout of your next power supply.

Features:

• 15mm x 15mm x 2.8mm LGA with 15°C/W θJA
• Pb-Free (e4), RoHS Compliant
• Only CBULK Required
• Standard and High Voltage:
  * LTM4600EV: 4.5V<=VIN<=20V
  * LTM4600HVEV: 4.5V<=VIN<=28V
• 0.6V<=VOUT<=5V
• IOUT: 10A DC, 14A Peak
• Parallel Two µModules for 20A Output

LTM4600 – 10A switchmode step-down power supply with a built-in inductor - [Link]

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

LM5117 / LM25117 — Powerwise Wide Input Range Synchronous Buck Controller with Analog Current Monitor - [Link]