LTC7103-1 Datasheet

• Wide V_IN Range: 4.4V to 105V (110V Abs Max)
• Ultralow EMI/EMC Emissions: CISPR 25 Compliant
• 2μA I_Q When Regulating 48V_IN to 3.3V_OUT
• Fast and Accurate Output Current Programming and Monitoring with No External R_SENSE
• Brick Wall Current Limit
• Low Minimum On-Time: 40ns
• Wide V_OUT Range: 1V to V_IN
• PassThru^™/100% Duty Cycle Capable
• Programmable Fixed Frequency: 200kHz to 2MHz
• Eight, Pin-Selectable Fixed (1.2V to 15V) or Adjustable Output Voltages
• Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode^® Operation at Light Loads
• PLL Synchronization to External Clock
• EXTV_CC LDO Powers Chip from V_OUT = 3.3V to 40V
• OPTI-LOOP^® or Fixed Internal Compensation
• Input and Output Overvoltage Protection
• Thermally Enhanced (5mm × 6mm) QFN Package
• AEC-Q100 Qualification in Process

• Battery Chargers and CC/CV Supplies
• Automotive and Military Systems
• Industrial, Avionics and Heavy Equipment
• Medical Instruments and Telecommunication

The LTC7103-1 is a high efficiency, monolithic synchro-nous step-down DC/DC converter utilizing a constant frequency, average current mode control architecture. It operates from an input voltage range of 4.4V to 105V and provides an adjustable regulated output voltage from 1V to V_IN while delivering up to 2.3A of output current.

The LTC7103-1 features high frequency operation and a low minimum on-time that reduce inductor size and enable constant-frequency operation even at very high step-down ratios. In addition, the LTC7103-1 achieves the lowest possible dropout voltage with 100% maximum duty cycle operation. During light load operation, converter efficiency and output ripple can be optimized by selecting Burst Mode, pulse-skipping or forced continuous operation.

The LTC7103-1 includes accurate, high speed average current programming and monitoring without the need for an external sense resistor. Additional features include a bypass LDO to maximize efficiency, fixed or adjustable output voltage and loop compensation, and a wide array of protection features to enhance reliability. Compared to the LTC7103, the LTC7103-1 is pin compatible, except that it also offers continuous inductor current mode.