Datasheet LT1933 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| 页数 / 页 | 20 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start. SHDN … |
| 文件格式/大小 | PDF / 371 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start. SHDN Pin Current. Typical Minimum Input Voltage
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LT1933
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start SHDN Pin Current
700 1.4 200 TA = 25°C TA = 25°C TA = 25°C DC = 30% 600 1.2 A) 150 500 1.0 μ 400 0.8 100 300 0.6 PIN CURRENT ( 200 0.4 SHDN 50 SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT (A) 100 0.2 0 0 0 0.0 0.5 1.0 1.5 0 1 2 3 4 0 4 8 12 16 FB PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) 1933 G10 1933 G11 1933 G12
Typical Minimum Input Voltage Typical Minimum Input Voltage Switch Current Limit
8 6.0 1.4 VOUT = 5V VOUT = 3.3V TA = 25°C TA = 25°C L = 33μH 5.5 L = 22μH 1.2 7 TO START TO START 1.0 5.0 0.8 6 4.5 0.6 4.0 INPUT VOLTAGE (V) TO RUN INPUT VOLTAGE (V) 0.4 5 SWITCH CURRENT LIMIT (A) 3.5 TO RUN 0.2 4 3.0 0 1 10 100 1 10 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 1933 G13 1933 G14 1933 G15
Operating Waveforms, Operating Waveforms Discontinuous Mode
VOUT1 VOUT1 1.8V 1.8V VSW 10V/DIV VSW 10V/DIV VOUT2 VOUT2 IL 200mA/DIV 1.2V IL 200mA/DIV 1.2V VOUT 10mV/DIV VOUT 10mV/DIV V 1933 G16 1933 G17 IN = 12V, VOUT = 3.3V, IOUT = 400mA, VIN = 12V, VOUT = 3.3V, IOUT = 20mA, L = 22μH, COUT = 22μF L = 22μH, COUT = 22μF 1933fe 5
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start SHDN Pin Current
700 1.4 200 TA = 25°C TA = 25°C TA = 25°C DC = 30% 600 1.2 A) 150 500 1.0 μ 400 0.8 100 300 0.6 PIN CURRENT ( 200 0.4 SHDN 50 SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT (A) 100 0.2 0 0 0 0.0 0.5 1.0 1.5 0 1 2 3 4 0 4 8 12 16 FB PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) 1933 G10 1933 G11 1933 G12
Typical Minimum Input Voltage Typical Minimum Input Voltage Switch Current Limit
8 6.0 1.4 VOUT = 5V VOUT = 3.3V TA = 25°C TA = 25°C L = 33μH 5.5 L = 22μH 1.2 7 TO START TO START 1.0 5.0 0.8 6 4.5 0.6 4.0 INPUT VOLTAGE (V) TO RUN INPUT VOLTAGE (V) 0.4 5 SWITCH CURRENT LIMIT (A) 3.5 TO RUN 0.2 4 3.0 0 1 10 100 1 10 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 1933 G13 1933 G14 1933 G15
Operating Waveforms, Operating Waveforms Discontinuous Mode
VOUT1 VOUT1 1.8V 1.8V VSW 10V/DIV VSW 10V/DIV VOUT2 VOUT2 IL 200mA/DIV 1.2V IL 200mA/DIV 1.2V VOUT 10mV/DIV VOUT 10mV/DIV V 1933 G16 1933 G17 IN = 12V, VOUT = 3.3V, IOUT = 400mA, VIN = 12V, VOUT = 3.3V, IOUT = 20mA, L = 22μH, COUT = 22μF L = 22μH, COUT = 22μF 1933fe 5