by Susan Nordyk:
The LT8471, a dual PWM DC/DC converter from Linear Technology, employs two internal 2-A, 50-V switches and an additional 500-mA switch to facilitate step-down, step-up, and inverting conversions. Each 2-A channel can be independently configured as a buck, boost, SEPIC, flyback, Zeta, or inverting converter.
This broad range of topologies and output configurations makes the LT8471 useful for a wide range of industrial and automotive applications. The converter operates from an input voltage of 2.6 V to 50 V, allowing it to be used with input sources ranging from single-cell lithium-ion to automotive batteries.
The LT8471 is capable of generating both positive and negative outputs. Its switching frequency is programmable and synchronizable from 100 kHz to 2 MHz. The device’s 50-V switches achieve overall efficiencies of up to 85% for buck and inverting applications. Operating from a 6-V to 32-V input, the LT8471 delivers up to 1.5 A at 5 V and 650 mA at –5 V.
Housed in a 20-lead, thermally enhanced TSSOP, the LT8471 costs $3.75 each in lots of 1000 units. An industrial-temperature version is priced at $4.13 in like quantities. Both versions are available from stock.
Multiple-topology DC/DC converter integrates dual 2-A switches - [Link]
by Mary Anne Tupta:
DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design.
Given the increased pressure to develop products that consume less power, design engineers are looking for ways to increase power conversion efficiencies. Thus, numerous measurements are required to characterize the electrical parameters of DC-DC converters.
Simplify DC-DC Converter Characterization - [Link]
Nixie tubes need about ~180Vdc to light up and thus on most devices a DC-DC converter is needed. We designed here a simple DC-DC switching regulator capable of powering most of Nixie tubes.
The module is based on the MAX1771 Step-Up DC-DC Controller. This controller works up to 300kHz switching frequency and that allows the usage of miniature surface mount components. It accepts an input voltage from 2 to 16.5V and the output is factory configured to 12V. In this module the output voltage is configured higher at ~180Vdc using external resistors and a potentiometer.
HV Nixie DC-DC Power Supply - [Link]
High efficiency, low standby power consumption and a power reserve, all this can be gained with a new adapter from our portfolio.
Minwa NR120P150PGS/E+ is in fact an “ordinary“ adapter with a fixed output voltage 12VDC/1500 mA. But it´s worth to mention, that it meets everything, what we usually require from a modern mains adapter:
- modern design (SMPS)
- high efficiency
- low standby power consumption (<0.3W)
- meets all latest regulations – EuP2, ErP,…
And finally a bonus – outstanding price. Adapters from company Minwa are in general always price-affordable, but here it is even more obvious. When we compare a one level weaker adapter NK120P100PGS/E+ (12V/1000 mA) with NR120P150PGS/E+ we´ll find, that for the price higher +14 (already at purchase of one piece) we´ll gain +50% power. So if you have a device requiring up to 1.5A current, or you use a 1A adapter at almost 100% and you want to gain some power reserve and probably a longer lifetime of an adapter, you can do so with minimum expenses.
Plus 50% of power for a scant one Euro? - [Link]
Smallest (2mm x 2.5mm), 8A, DC-DC Solution with Integrated MOSFETs in the Market
The MAX15108A high-efficiency, current-mode, synchronous step-down switching regulator with integrated power switches delivers up to 8A of output current. The regulator operates from 2.7V to 5.5V and provides an output voltage from 0.6V up to 95% of the input voltage, making the device ideal for distributed power systems, portable devices, and preregulation applications.
The IC utilizes a current-mode control architecture with a high gain transconductance error amplifier. The current-mode control architecture facilitates easy compensation design and ensures cycle-by-cycle current limit with fast response to line and load transients.
MAX15108A – High-Efficiency, 8A, Step-Down Switching Regulator - [Link]
MAX17504 – 4.5V–60V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation
The MAX17504 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 3.5A and 0.9V to 90% VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (5mm x 5mm) TQFN lead (Pb)-free package with an exposed pad. Simulation models are available.
Industry’s Only 60V, 3.5A Internal FET Synchronous Buck Converter - [Link]
The LTM4644 is a quad DC/DC step-down μModule (micromodule) regulator with 4A per output. Outputs can be paralleled in an array for up to 16A capability. Included in the package are the switching controllers, power FETs, inductors and support components – only bulk input and output capacitors are needed. Operating over an input voltage range of 4V to 14V or 2.375V to 14V with an external bias supply, the LTM4644 supports an output voltage range of 0.6V to 5.5V each set by a single external resistor. The LTM4644 is offered in 9mm ×15mm × 5.01mm BGA package.
LTM4644 – quad DC/DC step-down μModule regulator with 4A per output - [Link]
Modern DC/DC controllers from company Infineon, like TLF51801ELV manage even big challenges.
Perhaps everyone knows, that modern switch-mode power supplies are able to efficiently convert voltage and to replace linear power supplies. Features of ready-made DC/DC modules as well as SMPS controllers themselves are still better and nowadays it´s no problem to construct a 10A power supply on a small area. It is necessary to say, that for the most of applications it´s more advisable to use a ready-made module with proven features, developed by specialists in a given segments, like for example modules from company Traco. Despite this, there are surely many applications, where from several reasons it´s beneficial to use an own design. Offer of controllers for switch-mode power supplies is wide and this time we´d like to introduce you a modern step-down (buck) controller TLF51801ELV from company Infineon.
TLF51801 is interesting mainly by its overall „robustness“, because it´s directly designed for a construction of power supplies with a high output current (up to approx. 10A), what is also reflected in the MosFET drivers sizing, integrated soft start, under- and over-voltage protection, temperature protection, possibility of current limit setting and another features. Very beneficial is also a duty cycle of up to 99% enabling operation with a minimum difference (dropout) between input and output voltage.
TLF51801 is designed as a controller with a voltage feedback requiring 2 external N-FET transistors sized for a desired output current. Current monitoring (via pins SenseLow+SenseHigh) can be done through external sensing (shunt) resistor or with an advantage of a higher overall efficiency even an internal resistance of an FET transistor (RDSon). TLF5180 can operate in a wide range of input voltages 4,75-45V and at frequencies of 100-700kHz, while the clock frequency can be synchronized to an external clock. The circuit can be easily switched off via the “En” pin (enable), when it consumes only 2uA. An integrated thermal protection switches off the circuit at exceeding 175°C and switches on again (+SoftStart) after cooling down to 160°C.
The circuit TLF51801ELV is a brand new type and it will be soon available upon order. Detailed information will provide you the TLF51801ELV datasheet.
10A with 96% efficiency … no problem for TLF51801 - [Link]
The LT8614 is a 4A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher architecture reduces EMI/EMC emissions by more than 20dB, well below the CISPR 25 Class 5 limit. Even with switching frequencies in excess of 2MHz, synchronous rectification delivers efficiency as high as 96% while Burst Mode operation keeps quiescent current under 2.5μA in no-load standby conditions. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications.
LT8614 – 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current - [Link]
This is a DC-DC step-up converter based on LM2585-ADJ regulator manufactured by Texas Instruments. This IC was choosen for it’s simplicity of use, requiring minimal external components and for it’s ability to control the output voltage by defining the feedback resistors (R1,R2). NPN switching/power transistor is intergrated inside the regulator and is able to withstand 3A maximum current and 65V maximum voltage. Switching frequency is defined by internal oscillator and it’s fixed at 100KHz.
LM2585 12V to 24V @ 1A Step-up switching regulator - [Link]