Date: 19/02/2009

Current mode switching regulator for point-of-load applications

ROHM Semiconductor has released BD91x Series, the new step-down switching regulators with current-mode PWM control to provide better load regulation and high efficiency at both low- and high-current load conditions.
BD91x series regulators seamlessly transfer to / from conventional PWM control depending on load conditions to improve the efficiency. The current mode feedback enables fast response to load changes and prevents operational performance problems-or failure- in voltage-sensitive devices, especially in circuits with supply voltages of 1.8V or less. Variable point-of-load (POL) requirements are found in applications such as set top boxes, digital tuners, LCD displays, portable digital players, wireless LAN modules, personal computers, disk drives, microprocessor power supplies, GPS navigation systems and cell phones.

Key features and benefits of BD91x Series are:
Single and dual channel outputs
Output current ratings up to 4.0A
Fixed and variable output voltage (set by resistor selection)
High Accuracy: Provides output voltage accuracy of ±1.5 / ±2.0%
RoHS Compliant


"The BD91x regulators represent another series of new devices from ROHM Semiconductor that address the emerging needs for 'green' product designs," said Kevin Turchin, ROHM Semiconductor Field Application Engineering Manager. "With SLLM technology, system designers can provide longer, problem-free operation of portable devices as well as reduced energy consumption."