Datasheet LTC3809 (Analog Devices) - 4
| Hersteller | Analog Devices |
| Beschreibung | No RSENSE , Low EMI, Synchronous DC/DC Controller |
| Seiten / Seite | 24 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| Dateiformat / Größe | PDF / 298 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Maximum Current Sense Voltage
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LTC3809
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Maximum Current Sense Voltage Effi ciency vs Load Current Effi ciency vs Load Current vs ITH Pin Voltage
100 100 100 FIGURE 10 CIRCUIT V FIGURE 10 CIRCUIT OUT = 2.5V Burst Mode OPERATION 95 95 VIN = 5V, VOUT = 2.5V (ITH RISING) 80 Burst Mode OPERATION V 90 (I 90 OUT = 3.3V TH FALLING) 85 FORCED CONTINUOUS BURST MODE 60 MODE 85 V 80 (SYNC/MODE = PULSE SKIPPING OUT = 1.2V V MODE 80 75 IN) FORCED 40 V CONTINUOUS 75 OUT = 1.8V 70 EFFICIENCY (%) EFFICIENCY (%) (SYNC/MODE = 0V) 20 65 CURRENT LIMIT (%) 70 60 0 65 PULSE SKIPPING SYNC/MODE = VIN 55 (SYNC/MODE = 0.6V) VIN = 5V 60 50 –20 1 10 100 1k 10k 1 10 100 1k 10k 0.5 1 1.5 2 LOAD CURRENT (mA) LOAD CURRENT (mA) ITH VOLTAGE (V) 3809 G01 3809 G02 3809 G03
Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode)
VOUT VOUT 200mV/DIV 200mV/DIV AC COUPLED AC COUPLED IL IL 2A/DIV 2A/DIV 3809 G05 100μs/DIV 3809 G04 100μs/DIV VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A SYNC/MODE = VIN SYNC/MODE = 0V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Load Step (Pulse-Skipping Mode) Start-Up with Internal Soft-Start
VOUT 200mV/DIV VOUT AC COUPLED 1.8V 500mV/DIV IL 2A/DIV 3809 G07 100μs/DIV 3809 G06 200μs/DIV VIN = 3.3V VIN = 4.2V VOUT = 1.8V RLOAD = 1Ω ILOAD = 300mA TO 3A FIGURE 10 CIRCUIT SYNC/MODE = VFB FIGURE 10 CIRCUIT 3809fc 4
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Maximum Current Sense Voltage Effi ciency vs Load Current Effi ciency vs Load Current vs ITH Pin Voltage
100 100 100 FIGURE 10 CIRCUIT V FIGURE 10 CIRCUIT OUT = 2.5V Burst Mode OPERATION 95 95 VIN = 5V, VOUT = 2.5V (ITH RISING) 80 Burst Mode OPERATION V 90 (I 90 OUT = 3.3V TH FALLING) 85 FORCED CONTINUOUS BURST MODE 60 MODE 85 V 80 (SYNC/MODE = PULSE SKIPPING OUT = 1.2V V MODE 80 75 IN) FORCED 40 V CONTINUOUS 75 OUT = 1.8V 70 EFFICIENCY (%) EFFICIENCY (%) (SYNC/MODE = 0V) 20 65 CURRENT LIMIT (%) 70 60 0 65 PULSE SKIPPING SYNC/MODE = VIN 55 (SYNC/MODE = 0.6V) VIN = 5V 60 50 –20 1 10 100 1k 10k 1 10 100 1k 10k 0.5 1 1.5 2 LOAD CURRENT (mA) LOAD CURRENT (mA) ITH VOLTAGE (V) 3809 G01 3809 G02 3809 G03
Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode)
VOUT VOUT 200mV/DIV 200mV/DIV AC COUPLED AC COUPLED IL IL 2A/DIV 2A/DIV 3809 G05 100μs/DIV 3809 G04 100μs/DIV VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A SYNC/MODE = VIN SYNC/MODE = 0V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Load Step (Pulse-Skipping Mode) Start-Up with Internal Soft-Start
VOUT 200mV/DIV VOUT AC COUPLED 1.8V 500mV/DIV IL 2A/DIV 3809 G07 100μs/DIV 3809 G06 200μs/DIV VIN = 3.3V VIN = 4.2V VOUT = 1.8V RLOAD = 1Ω ILOAD = 300mA TO 3A FIGURE 10 CIRCUIT SYNC/MODE = VFB FIGURE 10 CIRCUIT 3809fc 4