Datasheet LTC3822 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | No RSENSE , Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| 页数 / 页 | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi … |
| 文件格式/大小 | PDF / 209 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency and Power Loss vs
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LTC3822
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency and Power Loss vs Maximum Current Sense Voltage Effi ciency vs Load Current Load Current vs ITH Pin Voltage
100 100 10 100 95 90 VIN = 3.3V EFFICIENCY 80 90 VOUT = 2.5V 80 85 70 POWER LOSS (W) VIN = 4.2V V 1 60 OUT = 1.0V 80 60 75 50 40 V VIN = 4.2V OUT = 1.8V 70 40 POWER LOSS EFFICIENCY (%) EFFICIENCY (%) 0.1 20 65 30 VIN = 3.3V CURRENT LIMIT (%) 60 20 0 55 10 VIN = 3.3V VOUT = 1.8V 50 0 0.01 –20 100 1000 10000 100 1000 10000 0.5 1 1.5 2.0 LOAD CURRENT (mA) LOAD CURRENT (mA) ITH VOLTAGE (V) 3822 G01 3822 G02 3822 G03
Load Step Start-Up with Internal Soft-Start
VOUT 100mV/DIV VOUT 1.8V IL 500mV/DIV 2A/DIV ILOAD 2A/DIV 40μs/DIV 3822 G04 200μs/DIV 3822 G05 VIN = 3.3V VIN = 4.2V VOUT = 1.8V RLOAD = 1Ω ILOAD = 1A TO 3A 3822fa 4
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency and Power Loss vs Maximum Current Sense Voltage Effi ciency vs Load Current Load Current vs ITH Pin Voltage
100 100 10 100 95 90 VIN = 3.3V EFFICIENCY 80 90 VOUT = 2.5V 80 85 70 POWER LOSS (W) VIN = 4.2V V 1 60 OUT = 1.0V 80 60 75 50 40 V VIN = 4.2V OUT = 1.8V 70 40 POWER LOSS EFFICIENCY (%) EFFICIENCY (%) 0.1 20 65 30 VIN = 3.3V CURRENT LIMIT (%) 60 20 0 55 10 VIN = 3.3V VOUT = 1.8V 50 0 0.01 –20 100 1000 10000 100 1000 10000 0.5 1 1.5 2.0 LOAD CURRENT (mA) LOAD CURRENT (mA) ITH VOLTAGE (V) 3822 G01 3822 G02 3822 G03
Load Step Start-Up with Internal Soft-Start
VOUT 100mV/DIV VOUT 1.8V IL 500mV/DIV 2A/DIV ILOAD 2A/DIV 40μs/DIV 3822 G04 200μs/DIV 3822 G05 VIN = 3.3V VIN = 4.2V VOUT = 1.8V RLOAD = 1Ω ILOAD = 1A TO 3A 3822fa 4