Datasheet LTC3458L (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| Páginas / Página | 16 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25. C unless otherwise … |
| Formato / tamaño de archivo | PDF / 385 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25. C unless otherwise specified). Fixed Frequency (FF). Discontinuous Current
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LTC3458L
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise specified) Fixed Frequency (FF) Fixed Frequency (FF) Discontinuous Current Continuous Current
SW 1V/DIV SW 1V/DIV IL 200mA/DIV GND IL 100mA/DIV 0mA 0mA V 500ns/DIV 3458L G14 V 500ns/DIV IN = 3.3V IN = 3.3V 3458L G15 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH
Over-Current with 2A ILIMIT Burst Mode Operation
VOUT 100mV/DIV IL 0.5A/DIV SW 5V/DIV SW 2V/DIV IL 0mA 200mA/DIV 0mA V 1 IN = 2.25V μs/DIV 3458L G16 VIN = 3.3V 50μs/DIV 3458L G17 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH RILIM = 84.5k COUT = 22μF CFF = 22pF RILIM = 84.5k
Burst Mode Operation Close-Up Soft-Start into 20
Ω
Load
VOUT 100mV/DIV VOUT 2V/DIV VIN 2V/DIV SW 5V/DIV SS 200mV/DIV 0mA I I L L 200mA/DIV 200mA/DIV VIN = 3.3V 2μs/DIV 3458L G18 V 2ms/DIV IN = 3.3V 3458L G19 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH COUT = 22μF CSS = 0.1μF CFF = 22pF* RILIM = 84.5k *CFF: FEED FORWARD CAPACITOR CONECTED BETWEEN VOUT AND FB. 3458lfa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise specified) Fixed Frequency (FF) Fixed Frequency (FF) Discontinuous Current Continuous Current
SW 1V/DIV SW 1V/DIV IL 200mA/DIV GND IL 100mA/DIV 0mA 0mA V 500ns/DIV 3458L G14 V 500ns/DIV IN = 3.3V IN = 3.3V 3458L G15 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH
Over-Current with 2A ILIMIT Burst Mode Operation
VOUT 100mV/DIV IL 0.5A/DIV SW 5V/DIV SW 2V/DIV IL 0mA 200mA/DIV 0mA V 1 IN = 2.25V μs/DIV 3458L G16 VIN = 3.3V 50μs/DIV 3458L G17 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH RILIM = 84.5k COUT = 22μF CFF = 22pF RILIM = 84.5k
Burst Mode Operation Close-Up Soft-Start into 20
Ω
Load
VOUT 100mV/DIV VOUT 2V/DIV VIN 2V/DIV SW 5V/DIV SS 200mV/DIV 0mA I I L L 200mA/DIV 200mA/DIV VIN = 3.3V 2μs/DIV 3458L G18 V 2ms/DIV IN = 3.3V 3458L G19 VOUT = 5V VOUT = 5V L = 7.4μH L = 7.4μH COUT = 22μF CSS = 0.1μF CFF = 22pF* RILIM = 84.5k *CFF: FEED FORWARD CAPACITOR CONECTED BETWEEN VOUT AND FB. 3458lfa 5