LTC3545EUD#PBF

LTC3545 is triple, high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The regulator operates independently with separate run pins. The 2.25V to 5.5V input voltage range makes the device well suited for single Li-Ion battery-powered applications. Low ripple pulse skip mode or high efficiency burst mode operation is externally selectable. PWM pulse skip mode operation provides very low output ripple voltage while burst mode operation increases efficiency at low output loads. Switching frequency is internally set to 2.25MHz, or the switching frequency can be synchronized to an external 1MHz to 3MHz clock. The internal synchronous switches increase efficiency and eliminate external Schottky diodes. Low output voltages are supported with the 0.6V feedback reference voltage. Application includes smart phones, wireless and DSL modems, digital still cameras, portable instruments and point of load regulation.

• Three 800mA outputs, high efficiency up to 95%
• Low ripple (<lt/>20mVP-P) burst mode operation IQ: 58μA
• Power good indicators easily allow power on sequencing between the three regulators
• 0.6V reference allows low output voltages
• Current mode operation/excellent transient response
• Output voltage load regulation is 0.5% (typical)
• Maximum synchronization frequency of 3MHz
• 16 lead plastic QFN package, -40°C to 125°C temperature range

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