Datasheet LTC3809-1 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | No RSENSE , Low Input Voltage, Synchronous DC/DC Controller with Output Tracking |
| 页数 / 页 | 24 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 文件格式/大小 | PDF / 267 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Current Sense Voltage
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LTC3809-1
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 8 CIRCUIT V FIGURE 8 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 (MODE = V PULSE SKIPPING OUT = 1.2V IN) MODE 80 75 FORCED 40 V CONTINUOUS 75 OUT = 1.8V 70 EFFICIENCY (%) EFFICIENCY (%) (MODE = 0V) 20 65 CURRENT LIMIT (%) 70 60 0 65 PULSE SKIPPING MODE = VIN 55 (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) 38091 G01 38091 G02 38091 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 100μs/DIV 38091 G04 100μs/DIV 38091 G05 100μs/DIV 38091 G06 VIN = 3.3V VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A MODE = VIN MODE = 0V MODE = VFB FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT
Start-Up with Internal Soft-Start Start-Up with External Soft-Start (TRACK/SS = VIN) (CSS = 10nF)
VOUT VOUT 1.8V 1.8V 500mV/DIV 500mV/DIV 200μs/DIV 38091 G07 1ms/DIV 38091 G08 VIN = 4.2V VIN = 4.2V RLOAD = 1 RLOAD = 1 FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT 38091fc 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 8 CIRCUIT V FIGURE 8 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 (MODE = V PULSE SKIPPING OUT = 1.2V IN) MODE 80 75 FORCED 40 V CONTINUOUS 75 OUT = 1.8V 70 EFFICIENCY (%) EFFICIENCY (%) (MODE = 0V) 20 65 CURRENT LIMIT (%) 70 60 0 65 PULSE SKIPPING MODE = VIN 55 (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) 38091 G01 38091 G02 38091 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 100μs/DIV 38091 G04 100μs/DIV 38091 G05 100μs/DIV 38091 G06 VIN = 3.3V VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A MODE = VIN MODE = 0V MODE = VFB FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT
Start-Up with Internal Soft-Start Start-Up with External Soft-Start (TRACK/SS = VIN) (CSS = 10nF)
VOUT VOUT 1.8V 1.8V 500mV/DIV 500mV/DIV 200μs/DIV 38091 G07 1ms/DIV 38091 G08 VIN = 4.2V VIN = 4.2V RLOAD = 1 RLOAD = 1 FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT 38091fc 4