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LTC3412EFE#TRPBF
LTC3412 2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator U FEATURES DESCRIPTIO ■ The LTC®3412 is a high efficiency monolithic synchronous, step-down DC/DC converter utilizing a constant frequency, current mode architecture. It operates from an input voltage range of 2.625V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V while delivering up to 2.5A of output current. The internal synchronous power switch with 85mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. Switching frequency is set by an external resistor or can be sychronized to an external clock. 100% duty cycle provides low dropout operation extending battery life in portable systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ High Efficiency: Up to 95% 2.5A Output Current Low Quiescent Current: 62μA Low RDS(ON) Internal Switches: 85mΩ Programmable Frequency: 300kHz to 4MHz No Schottky Diode Required ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protection Available in 16-Lead Thermally Enhanced TSSOP and QFN Packages The LTC3412 can be configured for either Burst Mode® operation or forced continuous operation. Forced continuous operation reduces noise and RF interference while Burst Mode operation provides high efficiency by reducing gate charge losses at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application. To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). U APPLICATIO S ■ ■ ■ ■ ■ ■ Portable Instruments Battery-Powered Equipment Notebook Computers Distributed Power Systems Cellular Telephones Digital Cameras , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO Efficiency vs Load Current VIN 2.7V TO 5.5V 100 22μF PVIN PGOOD 309k 4.7M 1μH SW LTC3412 PGND RUN/SS 470pF SGND 15k 1000pF 100μF 100pF ITH SYNC/MODE VFB 110k VOUT 2.5V 2.5A 80 Burst Mode OPERATION EFFICIENCY (%) SVIN RT 60 FORCED CONTINUOUS 40 20 392k 3412 F01 75k Figure 1. 2.5V, 2.5A Step-Down Regulator 0 0.001 VIN = 3.3V VOUT = 2.5V 0.01 0.1 1 LOAD CURRENT (A) 10 3412 G01 3412fb 1
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