Datasheet LTC3861-1 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 6 — Typical perFormance characTerisTics. Start-Up Response. Start-Up Response … |
| File Format / Size | PDF / 1.3 Mb |
| Document Language | English |
Typical perFormance characTerisTics. Start-Up Response. Start-Up Response (3-Phase. Regulated VFB vs Supply Voltage
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LTC3861-1
Typical perFormance characTerisTics Start-Up Response Start-Up Response (3-Phase Regulated VFB vs Supply Voltage (2-Phase Using LTC4449) Using FDMF6707B DrMOS)
604 VRUN 5V/DIV IL1 10A/DIV 602 IL1 I 10A/DIV L2 10A/DIV IL3 VOLTAGE (V) IL2 10A/DIV FB 600 10A/DIV V V OUT OUT 1V/DIV INTERNAL 500mV/DIV INTERNAL 598 SOFT-START SOFT-START REGULATED V 500µs/DIV 38611 G11 500µs/DIV 38611 G12 V V R IN = 12V RLOAD 50mΩ IN = 12V LOAD = 30mΩ 596 V V f OUT = 1.2V OUT = 1V SW = 500kHz 3 4 5 6 SUPPLY VOLTAGE (V) 38611 G10
Soft-Start Start-Up Response (2-Phase Using D12S1R845A Coincident Tracking (Single Ratiometric Tracking (Single Power Block) Phase Using FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS)
3.3V TRACKING 3.3V TRACKING SIGNAL SIGNAL VOUT VOUT 500mV/DIV 500mV/DIV VOUT 200mV/DIV 5ms/DIV 38611 G13 2ms/DIV 38611 G14 2ms/DIV 38611 G15 V 0.1µF CAPACITOR ON TRACK/SS1 V IN = 12V IN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK V f V OUT = 1.2V SW = 400kHz OUT = 1.8V VOUT = 1.8V
Start-Up Response Into a 300mV Initial 7-Cycle Nonsynchronous Prebiased Output (Single Phase Start-Up (Single Phase Using Start-Up Into a Short (Single Using FDMF6707B DrMOS) FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS)
IL I PWM 10A/DIV L 10A/DIV 2V/DIV VOUT PWM PWM 500mV/DIV 2V/DIV 2V/DIV TRACK/SS 500mV/DIV VOUT VOUT 500mV/DIV 500mV/DIV IL 20A/DIV 200µs/DIV 38611 G16 5µs/DIV 38611 G17 10ms/DIV 38611 G18 VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V 300mV PREBIASED OUTPUT VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V 38611fb 6 For more information www.linear.com/LTC3861-1 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 Start-Up Response Start-Up Response (3-Phase Regulated VFB vs Supply Voltage (2-Phase Using LTC4449) Using FDMF6707B DrMOS)
604 VRUN 5V/DIV IL1 10A/DIV 602 IL1 I 10A/DIV L2 10A/DIV IL3 VOLTAGE (V) IL2 10A/DIV FB 600 10A/DIV V V OUT OUT 1V/DIV INTERNAL 500mV/DIV INTERNAL 598 SOFT-START SOFT-START REGULATED V 500µs/DIV 38611 G11 500µs/DIV 38611 G12 V V R IN = 12V RLOAD 50mΩ IN = 12V LOAD = 30mΩ 596 V V f OUT = 1.2V OUT = 1V SW = 500kHz 3 4 5 6 SUPPLY VOLTAGE (V) 38611 G10
Soft-Start Start-Up Response (2-Phase Using D12S1R845A Coincident Tracking (Single Ratiometric Tracking (Single Power Block) Phase Using FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS)
3.3V TRACKING 3.3V TRACKING SIGNAL SIGNAL VOUT VOUT 500mV/DIV 500mV/DIV VOUT 200mV/DIV 5ms/DIV 38611 G13 2ms/DIV 38611 G14 2ms/DIV 38611 G15 V 0.1µF CAPACITOR ON TRACK/SS1 V IN = 12V IN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK V f V OUT = 1.2V SW = 400kHz OUT = 1.8V VOUT = 1.8V
Start-Up Response Into a 300mV Initial 7-Cycle Nonsynchronous Prebiased Output (Single Phase Start-Up (Single Phase Using Start-Up Into a Short (Single Using FDMF6707B DrMOS) FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS)
IL I PWM 10A/DIV L 10A/DIV 2V/DIV VOUT PWM PWM 500mV/DIV 2V/DIV 2V/DIV TRACK/SS 500mV/DIV VOUT VOUT 500mV/DIV 500mV/DIV IL 20A/DIV 200µs/DIV 38611 G16 5µs/DIV 38611 G17 10ms/DIV 38611 G18 VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V 300mV PREBIASED OUTPUT VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V 38611fb 6 For more information www.linear.com/LTC3861-1 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
