Datasheet LTC3861 (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 Transient Response. … |
| File Format / Size | PDF / 996 Kb |
| Document Language | English |
Typical perFormance characTerisTics. Start-Up Transient Response. Soft-Start Start-Up Response. Start-Up Response
Model Line for this Datasheet
Text Version of Document
LTC3861
Typical perFormance characTerisTics Start-Up Transient Response Soft-Start Start-Up Response Start-Up Response (4-Phase Using TDA21220 (2-Phase Using D12S1R845A (2-Phase Using LTC4449) DrMOS) Power Block)
VRUN 5V/DIV RUN I 5V/DIV L1 10A/DIV ILOAD I 50A/DIV L2 10A/DIV VOUT INTERNAL VOUT INTERNAL V 1V/DIV OUT SOFT-START 500mV/DIV SOFT-START 200mV/DIV 500µs/DIV 3861 G10 500µs/DIV 3861 G11 5ms/DIV 3861 G12 VIN = 12V RLOAD = 70mΩ VIN = 12V RLOAD = 0.016Ω VIN = 12V 0.1µF CAPACITOR ON TRACK/SS1 VOUT = 1.2V fSW = 300kHz VOUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 400kHz
Start-Up Response Into a 300mV Coincident Tracking (Single Ratiometric Tracking (Single Prebiased Output (Single Phase Phase Using FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS) Using FDMF6707B DrMOS)
3.3V TRACKING 3.3V TRACKING IL SIGNAL SIGNAL 10A/DIV VOUT VOUT 500mV/DIV 500mV/DIV PWM 2V/DIV VOUT 500mV/DIV 2ms/DIV 3861 G13 2ms/DIV 3861 G14 200µs/DIV 3861 G15 VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V
Initial 7-Cycle Nonsynchronous 128-Cycle Overcurrent Counter Start-Up (Single Phase Using Start-Up Into a Short (Single (Single Phase Using FDMF6707B FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS) DrMOS)
PWM 2V/DIV I PWM L 10A/DIV 2V/DIV TRACK/SS 200mV/DIV VOUT VOUT PWM 500mV/DIV 500mV/DIV 2V/DIV TRACK/SS 500mV/DIV VOUT 500mV/DIV IL IL 20A/DIV 20A/DIV 5µs/DIV 3861 G16 10ms/DIV 3861 G17 50µs/DIV 3861 G18 VIN = 12V 300mV PREBIASED OUTPUT VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V 3861fb 6 For more information www.linear.com/LTC3861 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 Transient Response Soft-Start Start-Up Response Start-Up Response (4-Phase Using TDA21220 (2-Phase Using D12S1R845A (2-Phase Using LTC4449) DrMOS) Power Block)
VRUN 5V/DIV RUN I 5V/DIV L1 10A/DIV ILOAD I 50A/DIV L2 10A/DIV VOUT INTERNAL VOUT INTERNAL V 1V/DIV OUT SOFT-START 500mV/DIV SOFT-START 200mV/DIV 500µs/DIV 3861 G10 500µs/DIV 3861 G11 5ms/DIV 3861 G12 VIN = 12V RLOAD = 70mΩ VIN = 12V RLOAD = 0.016Ω VIN = 12V 0.1µF CAPACITOR ON TRACK/SS1 VOUT = 1.2V fSW = 300kHz VOUT = 1V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.2V fSW = 400kHz
Start-Up Response Into a 300mV Coincident Tracking (Single Ratiometric Tracking (Single Prebiased Output (Single Phase Phase Using FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS) Using FDMF6707B DrMOS)
3.3V TRACKING 3.3V TRACKING IL SIGNAL SIGNAL 10A/DIV VOUT VOUT 500mV/DIV 500mV/DIV PWM 2V/DIV VOUT 500mV/DIV 2ms/DIV 3861 G13 2ms/DIV 3861 G14 200µs/DIV 3861 G15 VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V
Initial 7-Cycle Nonsynchronous 128-Cycle Overcurrent Counter Start-Up (Single Phase Using Start-Up Into a Short (Single (Single Phase Using FDMF6707B FDMF6707B DrMOS) Phase Using FDMF6707B DrMOS) DrMOS)
PWM 2V/DIV I PWM L 10A/DIV 2V/DIV TRACK/SS 200mV/DIV VOUT VOUT PWM 500mV/DIV 500mV/DIV 2V/DIV TRACK/SS 500mV/DIV VOUT 500mV/DIV IL IL 20A/DIV 20A/DIV 5µs/DIV 3861 G16 10ms/DIV 3861 G17 50µs/DIV 3861 G18 VIN = 12V 300mV PREBIASED OUTPUT VIN = 12V fSW = 500kHz EXTERNAL CLOCK VIN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V VOUT = 1.8V 3861fb 6 For more information www.linear.com/LTC3861 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
