Dual Output Low Standby Current Synchronous DC/DC Controller Released

Linear Technology Korea (CEO Hong Sa-kwak) announced the release of a dual-output (boost + buck) low standby current synchronous DC/DC controller (product name: LTC7813).

When cascade, this product's independent step-up (boost) and step-down (buck) controllers regulate the output voltage at an input voltage that is higher, lower, or equal to the output voltage during automotive load dumps or cold cranking periods.
Unlike conventional single-inductor buck-boost regulators, the LTC7813’s cascade boost+buck solution provides fast transient response to continuous, non-pulsating input and output currents. It substantially reduces ripple voltage and EMI, making it ideal for automotive, industrial, and high-power battery-operated systems.

The LTC7813 operates in an input voltage range of 4.5V to 60V, and after startup, it continues to operate even at a voltage lowered to 2.2V. The boost converter can generate an output voltage of up to 60V, and the buck converter uses the entire system, which achieves high efficiency of 98%, to produce an output operation in the range of 0.8V to 60V.

In addition, this device can be configured in pass-through or wire mode using a buck converter in which a synchronous boost MOSFET is kept on and operates at a 99% duty cycle, providing an input voltage result delivered to the output with minimal voltage drop.

The LTC7813 can be configured for Burst Mode® operation and reduces standby current to 29µA using the buck channel at 34µA in both standby modes. This feature is useful for preserving battery operating time.

The powerful 1Ω onboard all-N-channel gate drivers minimize MOSFET switching losses and provide an output current of over 10 amperes per channel, limiting only external components. The output current for each converter is detected by monitoring the voltage DCR (drop across the inductor) or using individual sense resistors.

The current mode architecture of the LTC7813 enables a selectable fixed frequency in the range of 50kHz to 900kHz or can be synchronized with an external clock of 75kHz to 850kHz. Additional features include adjustable gate drive voltage, soft start or tracking, foldback current limiting, output overvoltage protection, operation control, and a power good output signal.

The LTC7813 is available in a 32-pin 5mm x 5mm QFN package. It is priced at $4.82 per unit in quantities of 1,000.