Datasheet LT3480 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | 36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current |
| 页数 / 页 | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start. RUN/SS Pin Current. … |
| 文件格式/大小 | PDF / 388 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start. RUN/SS Pin Current. Boost Diode. Error Amp Output Current. Minimum Input Voltage
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LT3480
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start RUN/SS Pin Current Boost Diode
4.0 12 1.4 3.5 10 1.2 3.0 1.0 8 (V) 2.5 f 0.8 2.0 6 0.6 1.5 4 BOOST DIODE V 1.0 0.4 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (µA) 2 0.5 0.2 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 0 0.5 1.0 1.5 2.0 RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) BOOST DIODE CURRENT (A) 3480 G16 3480 G17 3480 G18
Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
50 5.0 6.5 40 4.5 30 6.0 20 4.0 10 5.5 TAGE (V) TAGE (V) 0 3.5 –10 5.0 PIN CURRENT (µA) INPUT VOL 3.0 INPUT VOL V C –20 V VOUT = 5V –30 OUT = 3.3V 2.5 T 4.5 A = 25°C TA = 25 °C L = 4.7µH –40 L = 4.7µH f = 800kHz f = 800kHz –50 2.0 4.0 –200 –100 0 100 200 1 10 100 1000 10000 1 10 100 1000 10000 FB PIN ERROR VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3480 G19 3480 G20 3480 G21
VC Voltages Power Good Threshold Switching Waveforms; Burst Mode
2.50 95 2.00 VSW CURRENT LIMIT CLAMP 90 5V/DIV 1.50 TAGE (%) TAGE (V) 85 IL VOL 1.00 0.2A/DIV V C SWITCHING THRESHOLD THRESHOLD VOL 80 0.50 VOUT 10mV/DIV 0 75 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 5µs/DIV 3480 G24 TEMPERATURE (°C) TEMPERATURE (°C) VIN = 12V; FRONT PAGE APPLICATION I 3480 G22 3480 G23 LOAD = 10mA 3480fe 6 For more information www.linear.com/LT3480 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start RUN/SS Pin Current Boost Diode
4.0 12 1.4 3.5 10 1.2 3.0 1.0 8 (V) 2.5 f 0.8 2.0 6 0.6 1.5 4 BOOST DIODE V 1.0 0.4 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (µA) 2 0.5 0.2 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 0 0.5 1.0 1.5 2.0 RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) BOOST DIODE CURRENT (A) 3480 G16 3480 G17 3480 G18
Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
50 5.0 6.5 40 4.5 30 6.0 20 4.0 10 5.5 TAGE (V) TAGE (V) 0 3.5 –10 5.0 PIN CURRENT (µA) INPUT VOL 3.0 INPUT VOL V C –20 V VOUT = 5V –30 OUT = 3.3V 2.5 T 4.5 A = 25°C TA = 25 °C L = 4.7µH –40 L = 4.7µH f = 800kHz f = 800kHz –50 2.0 4.0 –200 –100 0 100 200 1 10 100 1000 10000 1 10 100 1000 10000 FB PIN ERROR VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3480 G19 3480 G20 3480 G21
VC Voltages Power Good Threshold Switching Waveforms; Burst Mode
2.50 95 2.00 VSW CURRENT LIMIT CLAMP 90 5V/DIV 1.50 TAGE (%) TAGE (V) 85 IL VOL 1.00 0.2A/DIV V C SWITCHING THRESHOLD THRESHOLD VOL 80 0.50 VOUT 10mV/DIV 0 75 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 5µs/DIV 3480 G24 TEMPERATURE (°C) TEMPERATURE (°C) VIN = 12V; FRONT PAGE APPLICATION I 3480 G22 3480 G23 LOAD = 10mA 3480fe 6 For more information www.linear.com/LT3480 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts