LTC3407IMSE-2#PBF

LTC3407-2 Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator FEATURES DESCRIPTION High Efficiency: Up to 95% n Very Low Quiescent Current: Only 40µA n 2.25MHz Constant-Frequency Operation n High Switch Current: 1.2A on Each Channel n No Schottky Diodes Required n Low R DS(ON) Internal Switches: 0.35Ω n Current Mode Operation for Excellent Line and Load Transient Response n Short-Circuit Protected n Low Dropout Operation: 100% Duty Cycle n Ultralow Shutdown Current: I < 1µA Q n Output Voltages from 5V down to 0.6V n Power-On Reset Output n Externally Synchronizable Oscillator n Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages n AEC-Q100 Qualified for Automotive Applications The LTC®3407-2 is a dual, constant-frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power switches provide high efficiency without the need for external Schottky diodes. n APPLICATIONS PDAs/Palmtop PCs n Digital Cameras n Cellular Phones n Portable Media Players n PC Cards n Wireless and DSL Modems A user selectable mode input is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while pulse-skipping mode provides low noise ripple at light loads. To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40µA. In shutdown, the device draws