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LTC3407A-2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3407A-2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3407A-2 1 3407a2f ■ High Efficiency: Up to 95% ■ Low Ripple (<35mVPK-PK) Burst Mode Operation; IQ = 40μA ■ 2.25MHz Constant Frequency Operation ■ No Schottky Diodes Required ■ Low RDS(ON) Internal Switches: 0.35Ω ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Short-Circuit Protected ■ Low Dropout Operation: 100% Duty Cycle ■ Ultralow Shutdown Current: IQ <1μA ■ Output Voltages from 5V down to 0.6V ■ Power-On Reset Output ■ Externally Synchronizable Oscillator ■ Optional External Soft-Start ■ Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO ■ PDAs/Palmtop PCs ■ Digital Cameras ■ Cellular Phones ■ Wireless and DSL Modems Dual Synchronous 800mA, 2.25MHz Step-Down DC/DC Regulator The LTC ®3407A-2 is a dual, constant frequency, synchro- nous step-down DC/DC converter. Intended for low power applications, it operates from a 2.5V to 5.5V input voltage range and has 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 5V. Internal synchronous 0.35 Ω, 1A 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 low power efficiency. Burst Mode ® operation provides the highest efficiency at light loads, while Pulse Skip Mode provides the lowest ripple noise 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 40 μA. In shutdown, the device draws <1μA. Efficiency/Power Loss Curve 1mm High 2.5V/1.8V at 800mA Step-Down Regulators RUN/SS2 VIN VIN = 2.5V TO 5.5V VOUT2 = 2.5V AT 800mA VOUT1 = 1.8V AT 800mA RUN/SS1 POR SW1 VFB1 GND VFB2 SW2 MODE/SYNC LTC3407A-2 10 μF 100k RESET 22pF 22pF 2.2 μH 2.2 μH 887k 887k 442k 280k 10 μF 10 μF 3407A2 TA01 , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131. LOAD CURRENT (mA) 1 0 30 20 10 70 60 50 40 100 0.0001 0.001 0.1 0.01 1 90 80 10 100 1000 3407A2 TA02 2.5V VIN = 3.3V Burst Mode OPERATION NO LOAD ON OTHER CHANNEL 1.8V |
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