Datasheet LTC3869, LTC3869-2 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual, 2-Phase Synchronous Step-Down DC/DC Controllers |
| Pages / Page | 44 / 5 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 687 Kb |
| Document Language | English |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs Output Current
Model Line for this Datasheet
Text Version of Document
LTC3869/LTC3869-2
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs Output Current Efficiency vs Output Current Full Load Efficiency and Power and Mode and Mode Loss vs Input Voltage
100 100 90 5 1.8V 90 90 Burst Mode EFFICIENCY 80 OPERATION 80 Burst Mode OPERATION 70 70 1.2V POWER LOSS (W) 85 4 60 DCM 60 V DCM V 50 IN = 12V IN = 12V V 50 OUT = 1.8V VOUT = 1.2V 1.8V 40 40 EFFICIENCY (%) CCM EFFICIENCY (%) CCM EFFICIENCY (%) 80 POWER LOSS 3 30 30 1.2V 20 20 10 10 CIRCUIT OF FIGURE 16 CIRCUIT OF FIGURE 16 CIRCUIT OF FIGURE 16 0 0 75 2 0.01 0.1 1 10 100 0.01 0.1 1 10 100 5 10 15 20 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 3869 G01 3869 G02 3869 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
I I I LOAD LOAD LOAD 5A/DIV 5A/DIV 5A/DIV 300mA TO 5A 300mA TO 5A 300mA TO 5A I I L IL L 5A/DIV 5A/DIV 5A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED 50µs/DIV 3869 G04 50µs/DIV 3869 G05 50µs/DIV 3869 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V
Inductor Current at Light Load Prebiased Output at 2V
FORCED CONTINUOUS VOUT MODE 2V/DIV 5A/DIV Burst Mode OPERATION 5A/DIV VFB 500mV/DIV PULSE- SKIPPING TK/SS MODE 500mV/DIV 5A/DIV 1µs/DIV 3869 G07 2ms/DIV 3869 G08 VIN = 12V VIN = 12V VOUT = 1.8V VOUT = 3.3V ILOAD = 400mA 38692fb For more information www.linear.com/LTC3869 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs Output Current Efficiency vs Output Current Full Load Efficiency and Power and Mode and Mode Loss vs Input Voltage
100 100 90 5 1.8V 90 90 Burst Mode EFFICIENCY 80 OPERATION 80 Burst Mode OPERATION 70 70 1.2V POWER LOSS (W) 85 4 60 DCM 60 V DCM V 50 IN = 12V IN = 12V V 50 OUT = 1.8V VOUT = 1.2V 1.8V 40 40 EFFICIENCY (%) CCM EFFICIENCY (%) CCM EFFICIENCY (%) 80 POWER LOSS 3 30 30 1.2V 20 20 10 10 CIRCUIT OF FIGURE 16 CIRCUIT OF FIGURE 16 CIRCUIT OF FIGURE 16 0 0 75 2 0.01 0.1 1 10 100 0.01 0.1 1 10 100 5 10 15 20 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 3869 G01 3869 G02 3869 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
I I I LOAD LOAD LOAD 5A/DIV 5A/DIV 5A/DIV 300mA TO 5A 300mA TO 5A 300mA TO 5A I I L IL L 5A/DIV 5A/DIV 5A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED 50µs/DIV 3869 G04 50µs/DIV 3869 G05 50µs/DIV 3869 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V
Inductor Current at Light Load Prebiased Output at 2V
FORCED CONTINUOUS VOUT MODE 2V/DIV 5A/DIV Burst Mode OPERATION 5A/DIV VFB 500mV/DIV PULSE- SKIPPING TK/SS MODE 500mV/DIV 5A/DIV 1µs/DIV 3869 G07 2ms/DIV 3869 G08 VIN = 12V VIN = 12V VOUT = 1.8V VOUT = 3.3V ILOAD = 400mA 38692fb For more information www.linear.com/LTC3869 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
