特点
Wide Input Range: 7.4V to 40V
Tolerates Input Transients to 60V
700mA Peak Switch Rating
Adaptive Switch Drive Maintains Efficiency at High Load Without Pulse Skipping at Light Load
True Current Mode Control
200kHz Fixed Operating Frequency
Synchronizable to 400kHz
Low Supply Current in Shutdown: 30μA
Available in 8-Pin SO and PDIP Packages?
典型应用
典型应用
描述
The LT ? 1776 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die includes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control delivers excellent dynamic input supply rejection and short-circuit protection.
The LT1776 contains several features to enhance efficiency. The internal control circuitry is normally powered via the V CC pin, thereby minimizing power drawn directly from the V IN supply (see Applications Information). The action of the LT1776 switch circuitry is also load dependent. At medium to high loads, the output switch circuitry maintains fast rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior.
The available SO-8 package and 200kHz switching frequency allow for minimal PC board area requirements.
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