DESCRIPTION
The LTC®3545/LTC3545-1 are triple, high efficiency, monolithic synchronous buck regulators using a constant frequency, current mode architecture. The regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3545/LTC3545-1 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 effi ciency at low output loads.

FEATURES
■ Three 800mA Outputs
■ High Effi ciency: Up to 95%
■ 2.25V to 5.5V Input Voltage Range
■ Low Ripple (<20mVP-P) Burst Mode® Operation IQ: 58μA
■ 2.25MHz Constant Frequency Operation or
■ Synchronizable to External 1MHz to 3MHz Clock
■ Power Good Indicators Ease Supply Sequencing
■ 0.6V Reference Allows Low Output Voltages
■ Current Mode Operation/Excellent Transient Response
■ Low Profi le 16-Lead 3mm × 3mm QFN Package

APPLICATIONS
■ Smart Phones
■ Wireless and DSL Modems
■ Digital Still Cameras
■ Portable Instruments
■ Point of Load Regulation