Datasheet LTC3822-1 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | No RSENSE , Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| 页数 / 页 | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| 文件格式/大小 | PDF / 389 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Oscillator Frequency. Maximum Current Sense Voltage
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LTC3822-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Oscillator Frequency Maximum Current Sense Voltage Shutdown Quiescent Current vs Input Voltage vs ITH Pin Voltage vs Input Voltage
5 100 18 Burst Mode OPERATION 4 (ITH RISING) 16 80 Burst Mode OPERATION 3 (ITH FALLING) 14 FORCED CONTINUOUS µA) 2 60 MODE 12 1 PULSE SKIPPING MODE 10 0 40 8 –1 20 6 –2 CURRENT LIMIT (%) –3 SHUTDOWN CURRENT ( 4 0 NORMALIZED FREQUENCY SHIFT (%) –4 2 –5 –20 0 2.5 3.0 3.5 4.0 4.5 0.5 1 1.5 2 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) ITH VOLTAGE (V) INPUT VOLTAGE (V) 38221 G11 38221 G03 38221 G12
Quiescent Current in Normal Start-Up with External Soft-Start Operation vs Input Voltage Start-Up with Internal Soft-Start Capacitor
390 VRUN 380 1V/DIV V µA) RUN 1V/DIV VTRACK/SS 370 1V/DIV V 360 OUT 1V/DIV VOUT 1V/DIV 350 QUIESCENT CURRENT ( 340 200µs/DIV 38221 G14 4ms/DIV 38221 G15 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT 330 VIN = 3.3V VIN = 3.3V 2.5 3.0 3.5 4.0 4.5 VOUT = 1.8V VOUT = 1.8V INPUT VOLTAGE (V) RLOAD = 1.5Ω RLOAD = 1.5Ω CSS = 0.01µF 3822 G13
Soft-Start with Tracking Continuous Mode Operation
VTRACK/SS V 500mV/DIV SW 2V/DIV VOUT VOUT 20mV/DIV 1V/DIV AC COUPLED IL 2A/DIV 4ms/DIV 38221 G16 2µs/DIV 38221 G17 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V, 100mA RLOAD = 1.5Ω 38221f 5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Oscillator Frequency Maximum Current Sense Voltage Shutdown Quiescent Current vs Input Voltage vs ITH Pin Voltage vs Input Voltage
5 100 18 Burst Mode OPERATION 4 (ITH RISING) 16 80 Burst Mode OPERATION 3 (ITH FALLING) 14 FORCED CONTINUOUS µA) 2 60 MODE 12 1 PULSE SKIPPING MODE 10 0 40 8 –1 20 6 –2 CURRENT LIMIT (%) –3 SHUTDOWN CURRENT ( 4 0 NORMALIZED FREQUENCY SHIFT (%) –4 2 –5 –20 0 2.5 3.0 3.5 4.0 4.5 0.5 1 1.5 2 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) ITH VOLTAGE (V) INPUT VOLTAGE (V) 38221 G11 38221 G03 38221 G12
Quiescent Current in Normal Start-Up with External Soft-Start Operation vs Input Voltage Start-Up with Internal Soft-Start Capacitor
390 VRUN 380 1V/DIV V µA) RUN 1V/DIV VTRACK/SS 370 1V/DIV V 360 OUT 1V/DIV VOUT 1V/DIV 350 QUIESCENT CURRENT ( 340 200µs/DIV 38221 G14 4ms/DIV 38221 G15 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT 330 VIN = 3.3V VIN = 3.3V 2.5 3.0 3.5 4.0 4.5 VOUT = 1.8V VOUT = 1.8V INPUT VOLTAGE (V) RLOAD = 1.5Ω RLOAD = 1.5Ω CSS = 0.01µF 3822 G13
Soft-Start with Tracking Continuous Mode Operation
VTRACK/SS V 500mV/DIV SW 2V/DIV VOUT VOUT 20mV/DIV 1V/DIV AC COUPLED IL 2A/DIV 4ms/DIV 38221 G16 2µs/DIV 38221 G17 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V, 100mA RLOAD = 1.5Ω 38221f 5