DESCRIPTION
The LTC®3603 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 15V and provides an adjustable regulated output voltage from 0.6V to 14.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 45mΩ on-resistance increases effi ciency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

FEATURES
■ Wide Input Voltage Range: 4.5V to 15V
■ 2.5A Output Current
■ Low RDS(ON) Internal Switches: 45mΩ and 85mΩ
■ Programmable Frequency: 300kHz to 3MHz
■ Low Quiescent Current: 75μA
■ 0.6V ±1% Reference Allows Precise, Low Output Voltage
■ 99% Maximum Duty Cycle
■ Adjustable Burst Mode® Clamp
■ Synchronizable to External Clock
■ Power Good Output Voltage Monitor
■ Overtemperature Protection
■ Overvoltage Protection
■ Available in 16-Lead Thermally Enhanced MSOP and 4mm × 4mm QFN Packages

APPLICATIONS
■ Point-of-Load Supplies
■ Portable Instruments
■ Communications Infrastructure