Datasheet LTC3861-1 (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 / 1.3 Mb |
| Document Language | English |
Typical perFormance characTerisTics. Load Step Transient Response. (2-Phase Using D12S1R845A. (Single Phase Using LTC4449)
Model Line for this Datasheet
Text Version of Document
LTC3861-1
Typical perFormance characTerisTics Load Step Transient Response Load Step Transient Response Load Step Transient Response (2-Phase Using D12S1R845A (Single Phase Using LTC4449) (2-Phase Using LTC4449) Power Block)
ILOAD 20A/DIV IL I ILOAD 10A/DIV L1 10A/DIV 20A/DIV IL2 V 10A/DIV OUT V 50mV/DIV OUT 50mV/DIV AC-COUPLED VOUT 50mV/DIV AC-COUPLED AC-COUPLED 20µs/DIV 38611 G01 40µs/DIV 38611 G02 50µs/DIV 38611 G03 VIN = 12V ILOAD STEP = 3A TO 18A TO 3A VIN = 12V ILOAD STEP = 0A TO 20A TO 0A VIN = 12V ILOAD STEP = 4A TO 20A TO 4A VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 400kHz
Load Step Transient Response Load Step Transient Response (3-Phase Using FDMF6707B (4-Phase Using TDA21220 Line Step Transient Response DrMOS) DrMOS) (2-Phase Using LTC4449)
I V L1 IN 10A/DIV I 10V/DIV LOAD 40A/DIV IL1 IL2 10A/DIV 10A/DIV IL2 IL3 10A/DIV 10A/DIV VOUT 50mV/DIV VOUT AC-COUPLED VOUT 100mV/DIV 50mV/DIV AC-COUPLED AC-COUPLED 50µs/DIV 38611 G04 40µs/DIV 38611 G05 20µs/DIV 38611 G06 VIN = 12V ILOAD STEP = 0A TO 30A TO 0A VIN = 12V ILOAD STEP = 40A TO 80A TO 40A VIN = 7V TO 14V IN 20µs ILOAD = 20A VOUT = 1.2V fSW = 500kHz EXTERNAL CLOCK VOUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 300kHz
Feedback Voltage VFB Efficiency vs Load Current Efficiency vs Load Current vs Temperature
100 96 601.00 95 94 92 90 600.75 90 85 88 TAGE (V) 600.50 80 86 VOL 84 75 FB 600.25 82 70 80 EFFICIENCY (%) TED V EFFICIENCY (%) 600.00 65 78 V 60 IN = 12V 76 V REGULA OUT = 1.2V VIN = 12V, VOUT = 1V 599.75 74 55 2-PHASE, LTC4449 4-PHASE TDA21220 DrMOS f 72 SW = 300kHz fSW = 500kHz EXTERNAL CLOCK 50 70 599.50 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (A) LOAD CURRENT (A) TEMPERATURE (°C) 38611 G07 38611 G08 38611 G09 38611fb For more information www.linear.com/LTC3861-1 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 (Single Phase Using LTC4449) (2-Phase Using LTC4449) Power Block)
ILOAD 20A/DIV IL I ILOAD 10A/DIV L1 10A/DIV 20A/DIV IL2 V 10A/DIV OUT V 50mV/DIV OUT 50mV/DIV AC-COUPLED VOUT 50mV/DIV AC-COUPLED AC-COUPLED 20µs/DIV 38611 G01 40µs/DIV 38611 G02 50µs/DIV 38611 G03 VIN = 12V ILOAD STEP = 3A TO 18A TO 3A VIN = 12V ILOAD STEP = 0A TO 20A TO 0A VIN = 12V ILOAD STEP = 4A TO 20A TO 4A VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 300kHz VOUT = 1.2V fSW = 400kHz
Load Step Transient Response Load Step Transient Response (3-Phase Using FDMF6707B (4-Phase Using TDA21220 Line Step Transient Response DrMOS) DrMOS) (2-Phase Using LTC4449)
I V L1 IN 10A/DIV I 10V/DIV LOAD 40A/DIV IL1 IL2 10A/DIV 10A/DIV IL2 IL3 10A/DIV 10A/DIV VOUT 50mV/DIV VOUT AC-COUPLED VOUT 100mV/DIV 50mV/DIV AC-COUPLED AC-COUPLED 50µs/DIV 38611 G04 40µs/DIV 38611 G05 20µs/DIV 38611 G06 VIN = 12V ILOAD STEP = 0A TO 30A TO 0A VIN = 12V ILOAD STEP = 40A TO 80A TO 40A VIN = 7V TO 14V IN 20µs ILOAD = 20A VOUT = 1.2V fSW = 500kHz EXTERNAL CLOCK VOUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 300kHz
Feedback Voltage VFB Efficiency vs Load Current Efficiency vs Load Current vs Temperature
100 96 601.00 95 94 92 90 600.75 90 85 88 TAGE (V) 600.50 80 86 VOL 84 75 FB 600.25 82 70 80 EFFICIENCY (%) TED V EFFICIENCY (%) 600.00 65 78 V 60 IN = 12V 76 V REGULA OUT = 1.2V VIN = 12V, VOUT = 1V 599.75 74 55 2-PHASE, LTC4449 4-PHASE TDA21220 DrMOS f 72 SW = 300kHz fSW = 500kHz EXTERNAL CLOCK 50 70 599.50 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (A) LOAD CURRENT (A) TEMPERATURE (°C) 38611 G07 38611 G08 38611 G09 38611fb For more information www.linear.com/LTC3861-1 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
