Provides low power consumption characteristics

Linear Technology Korea (CEO Hong Sa-kwak) announced the launch of a highly integrated, high-voltage, low-noise dual-output power supply (Product Name: LTC3256). The new product provides high-efficiency 5V and 3.3V step-down supply voltages from a single positive input without an inductor.

This device features a wide input voltage range of 5.5V to 38V and includes dual outputs that can be enabled independently. With 5V 100mA and 250mA 3.3V LDO (low-dropout) regulators, the total maximum output current is 350mA. This regulator combination provides significantly lower power consumption characteristics than a dual LDO solution.

For example, when using the LTC3256 under maximum load conditions at two outputs from a 12V input, power consumption is reduced by more than 2W, thereby significantly reducing heat generation and input current. The LTC3256 is designed for ISO26262 diagnostic coverage and supports numerous safety and system monitoring features.

This device is suitable for various applications requiring low-noise, low-power rails from high-voltage inputs, such as automotive ECU/CAN transceiver power supplies, industrial and telecom housekeeping power supplies, and general-purpose low-voltage converters that convert 12V to 5V and 3.3V.

In most cases, the LTC3256 drives the charge pump in 2:1 mode to maximize efficiency, and automatically switches to 1:1 mode when necessary to match VIN and load conditions. Controlled input current and soft switching minimize inductive and radiated EMI.

This product provides a low quiescent current of just 20μA under two regulated (unloaded) output conditions, with a shutdown quiescent current of 0.5μA. An integrated watchdog timer, independent power good output, and reset input ensure reliable system operation and error detection. The 1.1V reference voltage output on the REFOUT pin allows the system to perform self-diagnostic tests for safety-critical applications. Additionally, the LTC3256 features extra safety functions, including overcurrent fault protection, overtemperature protection, and immunity to 38V transient inputs.

The LTC3256 is available in a thermally reinforced 16-lead MSOP package with a back thermal pad. The operating junction temperature range for Grades E and I is –40°C to 125°C, for Grade H it is –40°C to 150°C, and for Grade MP it is –55°C to 150°C. Stock is available, and pricing for Grade E starts at $2.95.