Datasheet LTC3856 (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp |
| Páginas / Página | 40 / 6 — Typical perForMance characTerisTics. Load Step:. Burst Mode Operation. … |
| Formato / tamaño de archivo | PDF / 840 Kb |
| Idioma del documento | Inglés |
Typical perForMance characTerisTics. Load Step:. Burst Mode Operation. Forced Continuous Mode. Efficiency vs Output Current
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LTC3856
Typical perForMance characTerisTics Load Step: Load Step: Burst Mode Operation Forced Continuous Mode
VBAT = 3.6V VBAT = 3.6V ILOAD ICPO = 200µA ILOAD ICPO = 200µA 40A/DIV CCPO = 2.2ΩF 40A/DIV CCPO = 2.2ΩF IL1 I 20A/DIV L1 20A/DIV IL2 I 20A/DIV L2 20A/DIV VOUT VOUT 200mV/DIV 200mV/DIV 3856 G01 3856 G02 100µs/DIV 100µs/DIV VIN = 12V VIN = 12V VOUT = 1.5V VOUT = 1.5V ILOAD = 1A TO 40A ILOAD = 1A TO 40A
Efficiency vs Output Current and Mode Inductor Current at Light Load
100 Burst Mode VBAT = 3.6V 90 OPERATION FORCED ICPO = 200µA 80 CONTINUOUS CCPO = 2.2ΩF MODE, 5A/DIV 70 60 FORCED CONTINUOUS Burst Mode 50 Stage MODE Shedding OPERATION, 5A/DIV 40 MODE EFFICIENCY (%) 30 DCM OPERATION, 5A/DIV 20 3856 G04 10 V 1µs/DIV IN = 12V V V OUT = 1.5V IN = 12V 0 VOUT = 1.5V 0.1 1 10 100 ILOAD = 400mA LOAD CURRENT (A) 3856 G03
Stage Shedding Transition, Stage Shedding Transition, 1-Phase to 2-Phase 2-Phase to 1-Phase
UNDERSHOOT OVERSHOOT 36mV V 35mV OUT VOUT 100mV/DIV 100mV/DIV VSW1 VSW1 10V/DIV 10V/DIV VSW2 VSW2 10V/DIV 10V/DIV 3856 G05 3856 G06 10µs/DIV 10µs/DIV VIN = 12V VIN = 12V VOUT = 1.5V VOUT = 1.5V 3856fa 6 For more information www.linear.com/LTC3856 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 Application Typical Application Related Parts
Typical perForMance characTerisTics Load Step: Load Step: Burst Mode Operation Forced Continuous Mode
VBAT = 3.6V VBAT = 3.6V ILOAD ICPO = 200µA ILOAD ICPO = 200µA 40A/DIV CCPO = 2.2ΩF 40A/DIV CCPO = 2.2ΩF IL1 I 20A/DIV L1 20A/DIV IL2 I 20A/DIV L2 20A/DIV VOUT VOUT 200mV/DIV 200mV/DIV 3856 G01 3856 G02 100µs/DIV 100µs/DIV VIN = 12V VIN = 12V VOUT = 1.5V VOUT = 1.5V ILOAD = 1A TO 40A ILOAD = 1A TO 40A
Efficiency vs Output Current and Mode Inductor Current at Light Load
100 Burst Mode VBAT = 3.6V 90 OPERATION FORCED ICPO = 200µA 80 CONTINUOUS CCPO = 2.2ΩF MODE, 5A/DIV 70 60 FORCED CONTINUOUS Burst Mode 50 Stage MODE Shedding OPERATION, 5A/DIV 40 MODE EFFICIENCY (%) 30 DCM OPERATION, 5A/DIV 20 3856 G04 10 V 1µs/DIV IN = 12V V V OUT = 1.5V IN = 12V 0 VOUT = 1.5V 0.1 1 10 100 ILOAD = 400mA LOAD CURRENT (A) 3856 G03
Stage Shedding Transition, Stage Shedding Transition, 1-Phase to 2-Phase 2-Phase to 1-Phase
UNDERSHOOT OVERSHOOT 36mV V 35mV OUT VOUT 100mV/DIV 100mV/DIV VSW1 VSW1 10V/DIV 10V/DIV VSW2 VSW2 10V/DIV 10V/DIV 3856 G05 3856 G06 10µs/DIV 10µs/DIV VIN = 12V VIN = 12V VOUT = 1.5V VOUT = 1.5V 3856fa 6 For more information www.linear.com/LTC3856 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 Application Typical Application Related Parts