The LT8705AHFE#PBF from Linear Technology is an 80V, VIN and VOUT synchronous 4-switch buck-boost DC to DC controller in 38 pin TSSOP package. It is a high performance buck-boost switching regulator controller operates from input voltages above, below or equal to the output voltage. It has integrated input current, input voltage, output current and output voltage feedback loops. With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705A is compatible with most solar, automotive, telecom and battery-powered systems. The LT8705A is an improved pin compatible version of the LT8705 and is recommended for new designs. The device includes a MODE pin to select among burst mode operation, discontinuous or continuous conduction mode at light loads. Additional features include a 3.3V/12mA LDO, a synchronizable fixed operating frequency and onboard gate drivers. It is used in high voltage buck-boost converters and input or output current limited converters.
● Single inductor allows VIN above, below or equal to regulated VOUT
● VIN range from 2.8V (need EXTVCC > 6.4V) to 80V
● Quad N-channel MOSFET gate drivers, synchronous rectification up to 98% efficiency
● VIN quiescent current of 2.65mA and VIN quiescent current in shutdown of 1µA
● Improved light load transition from DCM to FCM, clock output usable to monitor die temperature
● Input and output current monitor pins
● Synchronizable fixed frequency range from 100KHz to 400KHz
● Integrated input current, input voltage, output current and output voltage feedback loops
● Improved IMON_OUT, IMON_IN offset when cold
● Operating temperature range from -40°C to 150°C
