Features

• High Efficiency: Up to 96%
• Very Low Quiescent Current: 55μA Total
• 2.25MHz Constant Frequency Operation
• Low Dropout Operation: 100% Duty Cycle
• Low-Ripple (Typical 30mV_P-P) Burst Mode® Operation
• Peak Current-Mode Control Architecture for Excellent Line and Load Transient Response
• Wide Voltage Input Range: 4.5V to 15V
• 600mA/Channel Rated Output Current
• 0.6V Reference Allows Low Output Voltages
• ±1.5% Output Voltage Accuracy
• Ultralow Shutdown Current: I_Q < 1μA
• Internal Compensation
• Power Good Outputs
• Externally Frequency Synchronization (1MHz to 4MHz)
• Independent Internal Soft-Start for Each Channel
• Small 16-Lead Thermally Enhanced Thin QFN (3mm × 3mm) and MSE Packages

Typical Application

Description

The LTC®3607 is a 15V dual 600mA monolithic synchronous step-down regulator which has only 55μA quiescent current. Intended for a variety of applications, including dual lithium-ion battery products, it operates from a wide 4.5V to 15V input voltage range. It features a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to V_IN. The internal synchronous power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise.

To further the maximize battery run time, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle). In shutdown, the device draws <1μA.