LTC3541EDD#PBF

LTC3541 is a synchronous buck DC/ DC converter with a very low dropout linear regulator (VLDO) to provide upto two output voltages from a single input voltage with minimal external components. When configured for dual output operation, this device’s auto start-up feature will bring the buck output into regulation in a controlled manner prior to enabling the VLDO regulator output without the need for external pin control. VLDO/ linear regulator output prior to buck output sequencing may also be obtained via external pin control. The input voltage range is ideally suited for Li-ion battery-powered applications, as well as powering sub-3.3V logic from 5V or 3.3V rails. A mode-select pin allows Burst Mode operation to be enabled for higher efficiency at light load currents, or disabled for lower noise, constant frequency operation. It is used in application such as PDAs/palmtop PCs, digital cameras, cellular phones, PC Cards, wireless and DSL modems, other portable power systems etc.

• High efficiency, 500mA buck plus 300mA VLDO™ regulator
• Auto start-up powers buck output prior to VLDO/linear regulator output
• Wide input voltage range is 2.7V to 5.5V, short-circuit protected
• 300mA VLDO regulator with 30mA standalone mode, no external schottky diodes required
• Buck output voltage range is 0.8V to 5V, VLDO input voltage range is 0.9V to 5.5V
• VLDO output voltage range is 0.4V to 4.1V, Burst Mode® operation
• Current mode operation for excellent line and load transient response
• Low dropout buck operation is 100% duty cycle
• Oscillator frequency is 2.25MHz typ at ( TA = 25°C, VIN = 3.6V)
• Operating temperature is -40°C to 85°C, package style is 10-lead plastic DFN

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