Extended temperature, 42V switching regulators

August 21, 2014 // By Graham Prophet
Offering very high power efficiency at a competitive price point, these DC/DC regulators from Rohm are optimised for a broad range of industrial and consumer high performance power supplies.

Rohm's BD9G101G DC/DC converter features a high and wide input voltage range (VCC = 6~42V), an integrated internal high-side 42V power MOSFET, and provides 0.5A of DC output. Rohm's high-efficiency 6 MHz synchronous step-down switching regulator BU9000xGWZ uses an ultra-low current pulse-frequency modulation (PFM) mode and provides up to 1.0A of load current with an input voltage range from 4.0 to 5.5V.

Rohm claims these switching regulators provide high integration at smaller sizes, allowing designers to reduce space by more than 20%. With increased power efficiency and wide voltage input capabilities, designers can implement reduced power and energy saving features that improve system reliability for a broad range of applications.

BD9G101G gives power supply designers a wide operating voltage range from 6 to 42V with extended operating temperature (-40 to 105C) in a very small SOT23 (SSOP6) package that measures 2.9 x 2.8 x 1.25mm. Its fixed 1.5 MHz operating frequency allows the use of small inductors and ceramic capacitors. With a 45V/800 mΩ internal power MOSFET that delivers greater efficiency, the BD9G101G delivers 0.75V±1.5% feedback pin voltage and integrates overcurrent protection, under voltage lock out and thermal shutdown functions.

With built-in FETs that allow designers to accommodate space-constrained board layouts, the BU9000xGWZ is housed in an ultra-compact UCSP35L1 (1.3 x 0.9 x 0.4 mm) package. This switching regulator features 6 MHz high switching frequency for fast transient response and automatic Pulse Frequency Modulation (PFM)/Pulse Width Modulation (PWM) mode switching operation to enable high power efficiency over both light (PFM mode) and heavy (PWM mode) loads. Designers with widely varying loads can use PFM to achieve increased efficiency at lighter load currents. It also features internal overcurrent protection, under voltage lock out and thermal shutdown circuits.

Rohm Semiconductor; www.rohm.com/eu