DC/DC Converter

DC/DC Converter Selection Guide Ultra-Low-Power Switching Regulator P.02 60V Max Input High Buck Ratio Switching Regulator P.03 12V Input High Efficiency 3A Switching Regulator P.04 Ultra-Small-size Low Ringing Switching Regulators P.05 Small-size High Output Current Switching Regulator P.07 Wide Input Voltage Range Buck Switching Regulators P.08 Low Current Low Input Voltage Switching Regulator P.09 Wide Input Voltage Range Boost Switching Regulator P.10 Recommended Products 3.3V/5V Input Buck Converters P.13 12V Input Buck Converters P.15 24V Input Buck Converters P.17 Wide Input Voltage 24V/48V/60V...

Ultra-Low-Power Switching Regulator The BD70522GUL utilizes ROHM's ultra-low power technology Nano Energy®1 to achieve a quiescent operating current consumption of just 180nA. This significantly improves standby power efficiency, making it possible to prolong battery life in portable and wearable devices. Product Example Small-size CSP(Chip Scale Package) VCSP50L1C 1.76mm(Typ)X1.56mm(Typ)X0.57mm(Max) ■ Output voltage accuracy : ±2.5% ■ Quiescent operating current : 180nA ■ >90% efficiency at 10|uA output ■ Output voltage setting via pin selection 1.2V/1.5V/1.8V/2.0V/2.5V/2.8V/3.0V/3.2V/3.3V ■...

Power supply solution ideal for industrial equipment The BD9V101MUF-LB utilizes ROHM's ultra-fast pulse control technology Nano Pulse Control®* to achieve a high step-down ratio of up to 24:1 at 2MHz. For example, 2.5V output is possible from a 60V power supply at 2MHz. This makes it possible to reduce the number of power ICs required for step-down from high voltage to low voltage from two or more with conventional solutions to just one, contributing to set miniaturization and simpler system design. Product Example BD9V101MUF-LB Multiple protection functions Over Current Protection(OCP), Short-Circuit...

Ultra-High-Speed Pulse Control Technology: Nano Pulse Control®* Buck switching DC/DC converters generate an output voltage by controlling the switching pulse width. This pulse width is thicker when the step-down ratio of the input/output voltage is low and thinner when this ratio is high. As a result, when stepping down from a 60V power supply to 2.5V, the switching pulse width becomes extremely thin since the buck ratio is high (24:1). For example, when the switching frequency is 2MHz the switching cycle is 500ns, so with a step-down ratio of 24:1 the pulse width becomes ultra-narrow at 20.8ns....

Buck Converters Ultra-Small-size Low Ringing Switching Regulators The BD9A3 02QWZ, BD9B3 04QWZ, BD9B3 05QUZ, BD9D322QWZ, and BD9D323QWZ deliver 3A output in an ultra-small-size 2mm x 2mm package. In addition to reducing mounting area, the ultra-small-size form factor decreases parasitic inductance within the circuit and reduces the loop trace area where the change in switching current on the PCB is large, minimizing switching waveform ringing along with unnecessary radiation. The BD9B305QUZ also leverages low quiescent current consumption to achieve high efficiency (>80%) over a wide range of...

Product Example ■Input voltage range ■ Output voltage range ■ Reference voltage ■ Output current ■ Switching frequency ■ Built-In switching FET ■Quiescent current BD9D322QWZ : 4.5V to 18V : 0.765V to 7.0V : 0.765V±1.6% : 3A : 700kHz : 80mQ, 50mQ : 0.7mA ■ Fast transient response characteristics via fixed ON time control ■High efficiency Light Load Mode ■Variable Soft Start ■ Multiple protection functions Over Current Protection(OCP), Thermal Shutdown(TSD), Under Voltage Lock Out(UVLO) BD9D322QWZ Application Circuit Diagram Ultra-Small-size Package Efficiency vs Load Current -86% 3A output Large...

Small-size High Output Current Switching Regulator The BD9F800MUX is a synchronous rectification buck DC/DC converter that integrates a low ON resistance power MOSFET. A maximum output current of 8A is possible in a small-size 3.5mm square package. In addition, fixed ON time control achieves high-speed load response characteristics and eliminates the need for an external phase compensation circuit. Product Example Input voltage Output voltage Reference voltage Output current Switching frequency Built-In switching FET Fast transient response characteristics via fixed ON time control Multiple protection...

Wide Input Voltage Range Buck Switching Regulators The BD9G201EFJ-LB and BD9G401EFJ-M are asynchronous rectification switching regulators with built-in high side MOSFET that can operate over a wide input voltage range from 4.5V to 42V. Current mode control enables high-speed load response and easy phase compensation. When used as a compact secondary power supply, step-down voltages such as 3.3V and 5V can be output from 12V/24V power supplies. In addition, synchronization with an external clock makes it possible to carry out noise management. Product Example Input voltage range Reference voltage...

Low Current Low Input Voltage Switching Regulator The BU33UV7NUX is a boost DC/DC converter capable of generating 3.3V from a 1- or 2-battery power supply. The starting voltage is low at just 0.9V, and once started it can output 3.3V until the battery voltage drops to as low as 0.6V. In addition, a low circuit current of 13pA contributes to longer battery life. Product Example BU33UV7NUX ■ Input voltage range ■ Output voltage ■ Starting voltage ■Output current ■Circuit current ■ Power down current ■ Switching frequency 0.6V to 4.5V 3.3V(+1.3%/—1.15%) 0.9V 500mA(ViN>1.8V, high power modes) 50mA(ViN>1.8V,...

Wide Input Voltage Range Boost Switching Regulator The BD9615MUV-LB is a low-side Nch FET controller that supports high withstand voltages (60V) for switching regulators, making it suitable for applications requiring low-side FETs such as boost flybacks. Input voltage range ： 3.5V to 60V Reference voltage Guaranteed long-term supply for industrial equipment External clock synchronization Adjustable soft start Overvoltage protection circuit(via independent pin) Power Good output UVLO adjustment function(via external resistance) Max. duty switching function(50%/90%) BD9615MUV-LB Application Circuit...