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DC DC Power Converters electronics projects

DC DC Converters circuit projects design using buck converter, boost converter and flyback converter topology .

LTC3859 DC DC switching regulator IC

The LTC3859 is a high performance triple output synchronous DC DC switching regulator controller that drives all N-channel power MOSFET stages.
Constant frequency current mode architecture allows a phase-lockable switching frequency from 75kHz up to 850kHz. The LTC3859 DC DC switching regulator controller operates over a wide input voltage from 4.5V to 38V .
All three channels of the LTC3859 can be independently shut down using the RUN1, RUN2 and RUN3 pins ( by pulling any of these pins below 1.2V shuts down the main control loop for that channel) .

The main features of the LTC3859 DC DC switching regulator controller are : dual buck plus single boost synchronous controllers , outputs remain in regulation through cold crank down to 2.5V , low operating IQ: 55μA , wide bias input voltage range , buck output voltage range: 0.8V ≤ VOUT ≤ 24V , boost output voltage up to 60V , RSENSE or DCR current sensing , 100% duty cycle for boost synchronous MOSFET , phase-lockable frequency (75kHz to 850kHz) , programmable fixed frequency (50kHz to 900kHz) ,adjustable output voltage ,low shutdown current .
This regulator can be used in applications like : automotive systems , battery operated digital devices , distributed DC power systems , etc .
The design of a DC power supply circuit using this regulator ic is not complicated ( if you take a look in the manufacturer datasheet ), requiring a small number of external components . As you can see in this application circuit you can obtain a multi channel DC power supply that can provide different output voltage and which support different maximum output current .

LTC3859 DC DC switching regulator IC

LT3741 20A DC DC controller circuit diagram

The LT3741 is a fixed frequency synchronous step-down DC DC controller designed to accurately regulate the output current at up to 20A. The LT3741 is manufactured by Linear technology and will maintain inductor current regulation over a wide output voltage range of 0V to (VIN – 2V). The LT3741 DC DC controller IC operate over a wide input range , from 6 volts up to 36 volts . The regulated current is set by an analog voltage on the CTRL pins and an external sense resistor.

The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin or through the use of the SYNC pin and an external clock signal.
The LT3741 has a very low shutdown current (<1uA) and high efficiency up to 96% , 1.5% voltage regulation accuracy and  ±6% current regulation accuracy . The circuit is very easy to design and can be used in applications like : super-cap charging ,constant current or constant voltage source .
Main features of this DC controller are : 1.5% voltage regulation accuracy, ±6% current regulation accuracy , 6V to 36V input voltage range , wide output voltage range up to (VIN – 2V) , up to 94% efficiency , additional pin for thermal control of load current.
As you can see in this application circuit this regulator support high output currents , this circuit will provide 10 volts output voltage and a maximum current of 20 amperes .

LT3741 20A DC DC controller circuit diagram

ADP2300 ADP2301dc dc regulators schematic circuits

The ADP2300 ADP2301 are compact, constant-frequency, current-mode, step-down dc dc regulators with integrated power MOSFET. The ADP2300 , ADP2301 devices operates over a wide input voltage range from 3.0 V up to 20 V . The output voltage delivered by the ADP2300 , ADP2301 can be adjusted from 0.8 volts , up to 0.85xVin , with ±2% accuracy. The maximum output current that can be provided by ADP2300 ADP2301 regulators is up to 1.2 A load current.
There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to make decisions based on the trade-off between efficiency and total solution size. Current-mode control provides fast and stable line and load transient performance.

The ADP2300/ADP2301 use the fixed-frequency, peak current-mode PWM control architecture at medium to high loads, but shift to a pulse-skip mode control scheme at light loads to reduce the switching power losses and improve efficiency.
The design of the electronic circuit is very simple and require few external components (as you can see in these application examples ) .
Also in the manufacturer datasheet you can find all information you need to build a regulator circuit using ADP2300 , ADP2301 , ( in the datasheet you will find more information ,about how to design the inductors , how to arrange the components on the pcb layout to obtain the best performance , and more ) .
Main features of these devices include  : 1.2 A maximum load current  , ±2% output accuracy over temperature range , wide input voltage range: 3.0 V to 20 V  ,700 kHz or 1.4 MHz switching frequency options  , high efficiency up to 91%  , current-mode control architecture  , output voltage from 0.8 V to 0.85 × VIN  ,automatic PFM/PWM mode switching ,precision enable pin with hysteresis ,integrated high-side MOSFET , integrated bootstrap diode , internal compensation and soft start  , undervoltage lockout (UVLO) , overcurrent protection (OCP) , thermal shutdown (TSD) , ADIsimPower™ online design tool .

ADP2300 dc-to-dc regulators schematic circuit ADP2301 dc-to-dc regulators schematic circuit


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