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LT3070 Datasheet(PDF) 11 Page - Linear Technology |
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LT3070 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  LT3070 11 3070p APPLICATIONS INFORMATION Introduction Current generation FPGA and ASIC processors place stringent demands on the power supplies that power the core, I/O and transceiver channels. These microprocessors may cycle load current from near zero to amps in tens of nanoseconds. Output voltage specifications, especially in the 1V range, require tight tolerances including transient response as part of the requirement. Some ASIC processors require only a single output voltage from which the core and I/O circuitry operate. Some high performance FPGA processors require separate power supply voltages for the processor core, the I/O, and the transceivers. Often, these supply voltages must be low noise and high bandwidth to achieve the lowest bit-error rates. These requirements mandate the need for very accurate, low noise, high cur- rent, very high speed regulator circuits that operate at low input and output voltages. The LT3070 is a low voltage, UltraFast transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS (BW = 10Hz to 100kHz). The LT3070’s high bandwidth provides UltraFast transient response using low ESR ceramic output capacitors (15μF minimum), saving bulk capacitance, PCB area and cost. The LT3070’s features permit state-of-the-art linear regula- tor performance. The LT3070 is ideal for high performance FPGAs, microprocessors, sensitive communication sup- plies, and high current logic applications that also operate over low input and output voltages. Output voltage for the LT3070 is digitally selectable in 50mV increments over a 0.8V to 1.8V range. A margining function allows the user to tolerance system output voltage in increments of ±1%, ±3% or ±5%. The IC incorporates a unique tracking function, which if enabled by the user, controls an upsteam regulator power- ing the LT3070’s input (see Figure 8). This tracking function drives the buck regulator to maintain the LT3070’s input voltage to VOUT + 300mV. This input-to-output voltage control allows the user to change the regulator output voltage, and have the switching regulator powering the LT3070’s input to track to the optimum input voltage with no component changes. This combines the efficiency of a switching regulator with superior linear regulator response. It also permits thermal management of the system even with a maximum 5A output load. LT3070 internal protection includes input undervoltage lockout (UVLO), reverse-current protection, precision cur- rent limiting with power foldback and thermal shutdown. The LT3070 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package. The LT3070’s architecture drives an internal N-channel power MOSFET as a source follower. This configuration permits a user to realize an extremely low dropout, Ultra- Fast transient response regulator with excellent high fre- quency PSRR performance. The LT3070 achieves superior regulator bandwidth and transient load performance by eliminating expensive bulk tantalum or electrolytic capaci- tors in the most modern and demanding microprocessor applications. Users realize significant cost savings as all additional bulk capacitance is removed. The additional savings of insertion cost, purchasing/inventory cost and board space are readily apparent. Precision incremental output voltage control accommodates legacy and future microprocessor power supply voltages. Output capacitor networks simplify to direct parallel com- binations of ceramic capacitors. Often, the high frequency ceramic decoupling capacitors required by these various FPGA and ASIC processors are sufficient to stabilize the system (see Stability and Output Capacitance section). This regulator design provides ample bandwidth and responds to transient load changes in a few hundred nanoseconds versus regulators that respond in many microseconds. The LT3070 also incorporates precision current limiting, enable/disable control of output voltage and integrated overvoltage and thermal shutdown protection. The LT3070’s unique design combines the benefits of low dropout voltage, high functional integration, precision performance and UltraFast transient response, as well as providing significant cost savings on the output capacitance needed in fast load transient applications. As lower voltage applications become increasingly preva- lent with higher frequency switching power supplies, the LT3070 offers superior regulation and an appreciable |
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