ANALOG DEVICES LT1776IS8#TRPBF DC-DC Switching Buck Regulator, Adjustable, 7.4 to 40V in, 0.7A out, NSOIC-8

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. This contains several features to enhance efficiency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply. The action of this 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 behaviour. Typical applications are automotive DC/DC converters, cellular phone battery charger accessories, IEEE 1394 step-down converters.

• 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
• Minimum input voltage is 7.4V (TA=25°C, VIN=40V, VSW open, VCC=5V, VC=1.4V)
• VIN supply current is 800µA (VC=0V)
• FB pin input bias current is 1500nA
• 8-lead plastic SO package
• Operating junction temperature range from �40°C to 125°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party