LTC1771EMS8#PBF

LTC1771 is a high efficiency current mode stepdown DC/DC controller. It drives an external P-channel power MOSFET using a current mode, constant off-time architecture. An external sense resistor is used to program the operating current level. Current mode control provides short-circuit protection, excellent transient response and controlled start-up behaviour. Burst Mode operation enables the device to maintain high efficiency down to extremely low currents. For low noise applications, Burst Mode operation can be easily disabled with the MODE pin. It is widely used in application such as cellular telephones and wireless modems, 1- to 4-cell lithium-Ion-powered applications, portable instruments, battery-powered equipment, battery chargers, scanners etc.

• No-load supply current is 10µA typical
• Output current upto 5A
• Input voltage range is 2.8V to 20V
• Output voltage range is 1.23V to 18V
• High efficiency over 93% possible
• ±2% output accuracy, very low dropout operation is 100% duty cycle
• Current mode operation for excellent line and Load transient response
• Defeatable Burst Mode™ operation, short-circuit protected
• Optional programmable soft-start, micropower shutdown current is 2µA typical
• Operating temperature is -40°C to 85°C, package style is 8-lead plastic MSOP

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