Datasheet LTC7802 (Analog Devices) - 31
| Fabricante | Analog Devices |
| Descripción | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| Páginas / Página | 34 / 31 — TYPICAL APPLICATIONS. Load Step Transient Response. Efficiency vs Load … |
| Formato / tamaño de archivo | PDF / 3.1 Mb |
| Idioma del documento | Inglés |
TYPICAL APPLICATIONS. Load Step Transient Response. Efficiency vs Load Current. Output Voltage Noise Spectrum
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LTC7802
TYPICAL APPLICATIONS
INTVCC VIN 4.5V TO 38V D1 VIN 12V NOMINAL + V 100µF 10µF IN BOOST1 RUN1 TG1 MTOP1 RUN2 0.1µF L1, 0.16µH SW1 INTV V CC FB2 LTC7802 BG1 MBOT1 MODE FREQ 150Ω SENSE1+ INTVCC 1nF 3mΩ 4.7µF SENSE1– VOUT 3.3V, 24A PGOOD1 SENSE2– + 4.7µF COUT PGOOD2 1nF 3mΩ 210k ×6 470µF 150Ω 4V ITH1 SENSE2+ VFB1 6k TRACK/SS1 INTVCC 68.1k 47pF D2 0.1µF VIN ITH2 BOOST2 470pF TG2 TRACK/SS2 MTOP2 PLLIN/SPREAD 0.1µF L2, 0.16µH SW2 EXTVCC BG2 MBOT2 GND 7802 F10a fSW = 2.25MHz MTOP1,2: INFINEON BSC059N04LS6 MBOT1,2: INFINEON BSC022N04LS6 L1,2: COILCRAFT XAL5030-161ME D1,2: INFINEON BAS140WE6327HTSA1 COUT: KEMET T520D477M004ATE012
Load Step Transient Response Efficiency vs Load Current Output Voltage Noise Spectrum
95 0 V FORCED CONTINUOUS OPERATION OUT DETECTOR = PEAK-HOLD 200mV/DIV –10 RBW = 9.1kHz 90 –20 INDUCTOR L1 CURRENT PLLIN/SPREAD = GND –30 10A/DIV 85 PLLIN/SPREAD = INTVCC –40 80 –50 INDUCTOR L2 CURRENT –60 10A/DIV EFFICIENCY (%) 75 AMPLITUDE (dBm) –70 –80 10µs/DIV 7802 F10b 70 VIN = 8V V VIN = 12V –90 IN = 15V 0A TO 15A LOAD STEP VIN = 24V 65 –100 0 5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT (A) FREQUENCY (MHz) 7802 F10c 7802 F10d
Figure 10. 2.25MHz 2-Phase Single Output 3.3V, 24A Step-Down Regulator
Rev. 0 For more information www.analog.com 31 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL APPLICATIONS
INTVCC VIN 4.5V TO 38V D1 VIN 12V NOMINAL + V 100µF 10µF IN BOOST1 RUN1 TG1 MTOP1 RUN2 0.1µF L1, 0.16µH SW1 INTV V CC FB2 LTC7802 BG1 MBOT1 MODE FREQ 150Ω SENSE1+ INTVCC 1nF 3mΩ 4.7µF SENSE1– VOUT 3.3V, 24A PGOOD1 SENSE2– + 4.7µF COUT PGOOD2 1nF 3mΩ 210k ×6 470µF 150Ω 4V ITH1 SENSE2+ VFB1 6k TRACK/SS1 INTVCC 68.1k 47pF D2 0.1µF VIN ITH2 BOOST2 470pF TG2 TRACK/SS2 MTOP2 PLLIN/SPREAD 0.1µF L2, 0.16µH SW2 EXTVCC BG2 MBOT2 GND 7802 F10a fSW = 2.25MHz MTOP1,2: INFINEON BSC059N04LS6 MBOT1,2: INFINEON BSC022N04LS6 L1,2: COILCRAFT XAL5030-161ME D1,2: INFINEON BAS140WE6327HTSA1 COUT: KEMET T520D477M004ATE012
Load Step Transient Response Efficiency vs Load Current Output Voltage Noise Spectrum
95 0 V FORCED CONTINUOUS OPERATION OUT DETECTOR = PEAK-HOLD 200mV/DIV –10 RBW = 9.1kHz 90 –20 INDUCTOR L1 CURRENT PLLIN/SPREAD = GND –30 10A/DIV 85 PLLIN/SPREAD = INTVCC –40 80 –50 INDUCTOR L2 CURRENT –60 10A/DIV EFFICIENCY (%) 75 AMPLITUDE (dBm) –70 –80 10µs/DIV 7802 F10b 70 VIN = 8V V VIN = 12V –90 IN = 15V 0A TO 15A LOAD STEP VIN = 24V 65 –100 0 5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT (A) FREQUENCY (MHz) 7802 F10c 7802 F10d
Figure 10. 2.25MHz 2-Phase Single Output 3.3V, 24A Step-Down Regulator
Rev. 0 For more information www.analog.com 31 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts