Features

• Single Resistor Programmable V_OUT
• ±1% I_SET Accuracy
• Tight V_OUT Regulation Independent of V_OUT Voltage
• Easy to Parallel for Higher Current and Heat Spreading
• Wide V_OUT Range 0V to V_IN – 0.5V
• High Efficiency: Up to 96%
• 1.5A Output Current
• Adjustable Frequency: 200kHz to 4MHz
• 4V to 15V V_IN Range
• Current Mode Operation for Excellent Line and Load Transient Response
• Zero Supply Current in Shutdown
• Available in Thermally Enhanced 12-Pin (3mm × 3mm) DFN and MSOP Packages

Typical Application

Description

The LTC3600 is a high efficiency, monolithic synchronous buck regulator whose output is programmed with just one external resistor. The accurate internally generated 50μA current source on the I_SET pin allows the use of a single external resistor to program an output voltage that ranges from 0V to 0.5V below V_IN. The V_OUT voltage feeds directly back to the error amplifier in unity gain fashion and equals the I_SET voltage. The operating supply voltage range is 4V to 15V, making it suitable for dual lithium-ion battery and 5V or 12V input point-of-load power supply applications.

The operating frequency is synchronizable to an external clock or programmable from 200kHz to 4MHz with an external resistor. High switching frequency allows the use of small surface mount inductors. The unique constant on-time architecture is ideal for operating at high frequency in high step-down ratio applications that also demand fast load transient response.