LTC3544BEUD#PBF

LTC3544B is a quad, high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the device well suited for single Li-Ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. At moderate and low output load levels PWM pulse skip mode operation provides very low output ripple voltage for noise sensitive applications. The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. Low output voltages are easily supported with the 0.8V feedback reference voltage. It is widely used in application such as cellular telephones, personal information appliances, wireless and DSL modems, digital still cameras, media players, portable instruments etc.

• Input voltage range is 2.25V to 5.5V
• No schottky diodes required, low dropout operation: 100% duty cycle
• Pulse skipping at low load for minimum ripple
• 0.8V reference allows low output voltages
• Current mode operation for excellent line and load transient response
• Overtemperature protected
• Shutdown mode is 2µA maximum
• Input DC bias current active mode (pulse skip) is 825µA typical
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic QFN

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