Datasheet LT3481 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current |
| 页数 / 页 | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Error Amp Output Current. Minimum … |
| 文件格式/大小 | PDF / 315 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Error Amp Output Current. Minimum Input Voltage. Switching Waveforms;. VC Voltages
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LT3481
TYPICAL PERFORMANCE CHARACTERISTICS Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
100 4.5 6.5 80 4.0 6.0 60 40 3.5 5.5 20 TAGE (V) TAGE (V) 0 3.0 5.0 PIN CURRENT (μA) –20 C INPUT VOL INPUT VOL V V V –40 OUT = 3.3V OUT = 5.0V 2.5 TA = 25°C 4.5 TA = 25°C –60 L = 4.7μH L = 4.7μH f = 800kHz f = 800kHz –80 2.0 4.0 1.065 1.165 1?.265 1.365 1.465 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 FB PIN VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3481 G19 3481 G20 3481 G21
Switching Waveforms; VC Voltages Power Good Threshold Burst Mode Operation
2.50 1.200 VIN = 12V; FRONT PAGE APPLICATION ILOAD = 10mA 2.00 IL 1.180 0.5A/DIV CURRENT LIMIT CLAMP TAGE (V) 1.50 TAGE (V) 1.160 VSW 1.00 5V/DIV 1.140 SWITCHING THRESHOLD THRESHOLD VOL THRESHOLD VOL 0.50 VOUT 1.120 10mV/DIV PG RISING 0 1.100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 5μs/DIV 3481 G24 TEMPERATURE (°C) TEMPERATURE (°C) 3481 G22 3481 G23
Switching Waveforms; Transition from Burst Mode Operation to Switching Waveforms; Full Full Frequency Frequency Continuous Operation
IL I 0.5A/DIV L 0.5A/DIV V V RUN/SS RUN/SS 5V/DIV 5V/DIV VOUT VOUT 10mV/DIV 10mV/DIV VIN = 12V; FRONT PAGE APPLICATION VIN = 12V; FRONT PAGE APPLICATION ILOAD = 140mA ILOAD = 1A 3481 G25 1μs/DIV 3481 G26 1μs/DIV 3481fc 6
TYPICAL PERFORMANCE CHARACTERISTICS Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
100 4.5 6.5 80 4.0 6.0 60 40 3.5 5.5 20 TAGE (V) TAGE (V) 0 3.0 5.0 PIN CURRENT (μA) –20 C INPUT VOL INPUT VOL V V V –40 OUT = 3.3V OUT = 5.0V 2.5 TA = 25°C 4.5 TA = 25°C –60 L = 4.7μH L = 4.7μH f = 800kHz f = 800kHz –80 2.0 4.0 1.065 1.165 1?.265 1.365 1.465 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 FB PIN VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3481 G19 3481 G20 3481 G21
Switching Waveforms; VC Voltages Power Good Threshold Burst Mode Operation
2.50 1.200 VIN = 12V; FRONT PAGE APPLICATION ILOAD = 10mA 2.00 IL 1.180 0.5A/DIV CURRENT LIMIT CLAMP TAGE (V) 1.50 TAGE (V) 1.160 VSW 1.00 5V/DIV 1.140 SWITCHING THRESHOLD THRESHOLD VOL THRESHOLD VOL 0.50 VOUT 1.120 10mV/DIV PG RISING 0 1.100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 5μs/DIV 3481 G24 TEMPERATURE (°C) TEMPERATURE (°C) 3481 G22 3481 G23
Switching Waveforms; Transition from Burst Mode Operation to Switching Waveforms; Full Full Frequency Frequency Continuous Operation
IL I 0.5A/DIV L 0.5A/DIV V V RUN/SS RUN/SS 5V/DIV 5V/DIV VOUT VOUT 10mV/DIV 10mV/DIV VIN = 12V; FRONT PAGE APPLICATION VIN = 12V; FRONT PAGE APPLICATION ILOAD = 140mA ILOAD = 1A 3481 G25 1μs/DIV 3481 G26 1μs/DIV 3481fc 6