Datasheet LTC3861 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 5 — Typical perFormance characTerisTics. Load Step Transient Response. … |
| File Format / Size | PDF / 996 Kb |
| Document Language | English |
Typical perFormance characTerisTics. Load Step Transient Response. (2-Phase Using D12S1R845A. (3-Phase Using FDMF6707B
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LTC3861
Typical perFormance characTerisTics Load Step Transient Response Load Step Transient Response Load Step Transient Response (2-Phase Using D12S1R845A (3-Phase Using FDMF6707B (Single Phase Using LTC4449) Power Block) DrMOS)
ILOAD 20A/DIV ILOAD IL1 20A/DIV 10A/DIV IL1 20A/DIV IL2 IL 10A/DIV 10A/DIV IL2 IL3 V 20A/DIV OUT 10A/DIV 50mV/DIV V AC-COUPLED OUT 50mV/DIV VOUT AC-COUPLED 100mV/DIV AC-COUPLED 50µs/DIV 3861 G01 100µs/DIV 3861 G02 50µs/DIV 3861 G03 VIN = 12V ILOAD STEP = 0A TO 18A VIN = 12V ILOAD STEP = 0A TO 20A VIN = 12V ILOAD STEP = 0A TO 30A VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 400kHz VOUT = 1V fSW = 500kHz EXTERNAL CLOCK
Load Step Transient Response (4-Phase Using TDA21220 Line Step Transient Response DrMOS) (2-Phase Using LTC4449) Efficiency vs Load Current
100 VIN 95 ILOAD 10V/DIV 40A/DIV 90 IL1 10A/DIV 85 80 VOUT IL2 100mV/DIV 10A/DIV 75 AC-COUPLED 70 VOUT EFFICIENCY (%) 50mV/DIV 65 AC-COUPLED VIN = 12V 60 50µs/DIV 3861 G04 20µs/DIV 3861 G05 VOUT = 1.2V 2-PHASE, LTC4449 V 55 IN = 12V ILOAD STEP = 40A TO 80A VIN = 7V TO 14V IN 20µs ILOAD = 20A f V SW = 300kHz OUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 300kHz 50 0 10 20 30 40 50 60 70 LOAD CURRENT (A) 3861 G06
Feedback Voltage VFB Efficiency vs Load Current vs Temperature Regulated VFB vs Supply Voltage
96 601.00 604 94 92 600.75 90 602 88 86 TAGE (V) 600.50 84 VOL VOLTAGE (V) FB 600.25 82 FB 600 80 TED V EFFICIENCY (%) 78 600.00 76 598 REGULA 74 VIN = 12V, VOUT = 1V 599.75 REGULATED V 4-PHASE TDA21220 DrMOS 72 fSW = 500kHz EXTERNAL CLOCK 70 599.50 596 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 150 3 4 5 6 LOAD CURRENT (A) TEMPERATURE (°C) SUPPLY VOLTAGE (V) 3861 G07 3861 G08 3861 G09 3861fb For more information www.linear.com/LTC3861 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
Typical perFormance characTerisTics Load Step Transient Response Load Step Transient Response Load Step Transient Response (2-Phase Using D12S1R845A (3-Phase Using FDMF6707B (Single Phase Using LTC4449) Power Block) DrMOS)
ILOAD 20A/DIV ILOAD IL1 20A/DIV 10A/DIV IL1 20A/DIV IL2 IL 10A/DIV 10A/DIV IL2 IL3 V 20A/DIV OUT 10A/DIV 50mV/DIV V AC-COUPLED OUT 50mV/DIV VOUT AC-COUPLED 100mV/DIV AC-COUPLED 50µs/DIV 3861 G01 100µs/DIV 3861 G02 50µs/DIV 3861 G03 VIN = 12V ILOAD STEP = 0A TO 18A VIN = 12V ILOAD STEP = 0A TO 20A VIN = 12V ILOAD STEP = 0A TO 30A VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 400kHz VOUT = 1V fSW = 500kHz EXTERNAL CLOCK
Load Step Transient Response (4-Phase Using TDA21220 Line Step Transient Response DrMOS) (2-Phase Using LTC4449) Efficiency vs Load Current
100 VIN 95 ILOAD 10V/DIV 40A/DIV 90 IL1 10A/DIV 85 80 VOUT IL2 100mV/DIV 10A/DIV 75 AC-COUPLED 70 VOUT EFFICIENCY (%) 50mV/DIV 65 AC-COUPLED VIN = 12V 60 50µs/DIV 3861 G04 20µs/DIV 3861 G05 VOUT = 1.2V 2-PHASE, LTC4449 V 55 IN = 12V ILOAD STEP = 40A TO 80A VIN = 7V TO 14V IN 20µs ILOAD = 20A f V SW = 300kHz OUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 300kHz 50 0 10 20 30 40 50 60 70 LOAD CURRENT (A) 3861 G06
Feedback Voltage VFB Efficiency vs Load Current vs Temperature Regulated VFB vs Supply Voltage
96 601.00 604 94 92 600.75 90 602 88 86 TAGE (V) 600.50 84 VOL VOLTAGE (V) FB 600.25 82 FB 600 80 TED V EFFICIENCY (%) 78 600.00 76 598 REGULA 74 VIN = 12V, VOUT = 1V 599.75 REGULATED V 4-PHASE TDA21220 DrMOS 72 fSW = 500kHz EXTERNAL CLOCK 70 599.50 596 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 150 3 4 5 6 LOAD CURRENT (A) TEMPERATURE (°C) SUPPLY VOLTAGE (V) 3861 G07 3861 G08 3861 G09 3861fb For more information www.linear.com/LTC3861 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
