Linear Technology Corporationannounces the LT8709, a synchronous pwm controller for negative-to-negative or negative-to-positive dc-dc conversion. The LT8709 solves the problem of regulating a negative voltage with respect to system ground, without the need of complicated level shifting circuitry. The device’s synchronous operation means that the output diode is replaced with a high efficiency P-channel MOSFET, thereby increasing efficiency, allowing for higher output currents (up to 20A), and eliminating the heat sink typically required in medium to high power applications. The LT8709 can be configured in buck, boost, buck-boost, and inverting topologies, making it highly-versatile for a wide range of power supply designs.
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The LT8709 operates over a -4.5V to -80V input voltage range and produces an output voltage from -0.1V to as high as 60V or from -1.4V to as low as -80V. Its rail-to-rail output current monitor and control enables the device to be configured as a current source. The LT8709 features innovative EN/FBIN pin circuitry for slowly varying input signals and an adjustable undervoltage lockout function. This pin is also used for input voltage regulation to avoid collapsing a high impedance supply.
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