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LTC3124 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3124 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 28 page  LTC3124 10 3124f For more information www.linear.com/LTC3124 OPERATION TheLTC3124isadual-phase,adjustablefrequency(100kHz to 3MHz) synchronous boost converter housed in either a 16-lead5mm ×3mmDFNorathermally-enhancedTSSOP package. The LTC3124 offers the unique ability to start up from inputs as low as 1.8V and continue to operate from inputs as low as 0.5V, for output voltages greater than 2.5V. The device also features fixed frequency, current mode PWM control for exceptional line and load regula- tion. The current mode architecture with adaptive slope compensation provides excellent load transient response and requires minimal output filtering. An internal 10ms soft-start limits inrush current during start-up and simpli- fies the design process while minimizing the number of external components. WithitslowRDS(ON)andlowgatechargeinternalN-channel MOSFET switches and P-channel MOSFET synchronous rectifiers, the LTC3124 achieves high efficiency over a wide range of load current. High efficiency is achieved at light loads by utilizing Burst Mode operation. Operation can be best understood by referring to the Block Diagram. MULTIPHASE OPERATION The LTC3124 uses a dual-phase architecture, rather than the conventional single phase of other boost converters. By having two phases equally spaced 180° apart, not only is the output ripple frequency increased by a factor of two, but the output capacitor ripple current is significantly reduced. Although this architecture requires two induc- tors, rather than a single inductor, there are a number of important advantages. • Substantially lower peak inductor current allows the use of smaller, lower cost inductors. • Significantly reduced output ripple current minimizes output capacitance requirement. • Higher frequency output ripple is easier to filter for low noise applications. • Input ripple current is also reduced for lower noise on VIN. Figure 1. Comparison of Output Ripple Current with Single Phase and Dual Phase Boost Converter in a 1.5A Load Application Operating at 50% Duty Cycle The peak inductor current, reduced nearly by a factor of 2 when compared to a single phase step-up converter, is given by: ILPEAK ≅ 1 2 • IO (1–D) + ∆ IL 2 1 where IO is the average load current, D is the PWM duty cycle, and ∆IL is the inductor ripple current. This relation- ship is shown graphically in Figure 1. With 2-phase operation, one of the phases is always de- livering current to the load whenever VIN is greater than one-half VOUT (duty cycles less than 50%). As the duty cycle decreases further, load current delivery between the two phases begins to overlap, occurring simultaneously for a growing portion of each phase as the duty cycle ap- proaches zero. This significantly reduces both the output ripple current and the peak current in each inductor, when comparedwithasingle-phaseconverter.Thisisillustrated in the waveforms of Figures 2 and 3. TIME (µs) 0 3.5 3.0 2.0 1.0 2.5 1.5 0.5 0 1.0 3124 F01 1.5 0.5 SINGLE PHASE DUAL PHASE |
Similar Part No. - LTC3124_15 |
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Similar Description - LTC3124_15 |
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