Datasheet LT8614 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| 页数 / 页 | 24 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. Frequency. … |
| 修订版 | F |
| 文件格式/大小 | PDF / 1.8 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. Frequency. VIN UVLO. Bias Pin Current. Switching Waveforms, Full
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LT8614
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching Frequency VIN UVLO Bias Pin Current
250 3.6 6.0 VBIAS = 5V 225 3.4 V 5.5 OUT = 5V 200 ILOAD = 1A 3.2 fSW = 700kHz 175 5.0 150 3.0 4.5 125 2.8 4.0 100 2.6 RT PIN RESISTOR (kΩ) 75 INPUT VOLTAGE (V) 3.5 2.4 BIAS PIN CURRENT (mA) 50 3.0 25 2.2 0 2.0 2.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8614 G27 8614 G29 8614 G30
Switching Waveforms, Full Switching Waveforms, Burst Bias Pin Current Frequency Continuous Operation Mode Operation
14 VBIAS = 5V V 12 VOUT = 5V SW V V SW IN = 12V 5V/DIV 5V/DIV ILOAD = 1A 10 IL IL 500mA/DIV 500mA/DIV 8 VOUT VOUT 5mV/DIV 6 10mV/DIV 8614 G32 8614 G33 4 500ns/DIV 5µs/DIV BIAS PIN CURRENT (mA) FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 12V 2 IN TO 5VOUT AT 1A IN TO 5VOUT AT 10mA VSYNC = 0V 00.2 0.6 1 1.4 1.8 2.2 2.6 3 SWITCHING FREQUENCY (MHz) 8614 G31
Transient Response; Load Current Transient Response; Load Current Stepped from 100mA (Burst Mode Switching Waveforms Stepped from 1A to 2A Operation) to 1.1A
IL 500mA/DIV ILOAD ILOAD 1A/DIV 1A/DIV VSW VOUT VOUT 5V/DIV 100mV/DIV 200mV/DIV 200ns/DIV 8614 G34 50µs/DIV 8614 G35 50µs/DIV 8614 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 36VIN TO 5VOUT AT 1A 1A TO 2A TRANSIENT 100mA (Burst Mode OPERATION) TO 12VIN, 5VOUT 1.1A TRANSIENT COUT = 47µF 12VIN, 5VOUT COUT = 47µF Rev. F For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching Frequency VIN UVLO Bias Pin Current
250 3.6 6.0 VBIAS = 5V 225 3.4 V 5.5 OUT = 5V 200 ILOAD = 1A 3.2 fSW = 700kHz 175 5.0 150 3.0 4.5 125 2.8 4.0 100 2.6 RT PIN RESISTOR (kΩ) 75 INPUT VOLTAGE (V) 3.5 2.4 BIAS PIN CURRENT (mA) 50 3.0 25 2.2 0 2.0 2.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8614 G27 8614 G29 8614 G30
Switching Waveforms, Full Switching Waveforms, Burst Bias Pin Current Frequency Continuous Operation Mode Operation
14 VBIAS = 5V V 12 VOUT = 5V SW V V SW IN = 12V 5V/DIV 5V/DIV ILOAD = 1A 10 IL IL 500mA/DIV 500mA/DIV 8 VOUT VOUT 5mV/DIV 6 10mV/DIV 8614 G32 8614 G33 4 500ns/DIV 5µs/DIV BIAS PIN CURRENT (mA) FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 12V 2 IN TO 5VOUT AT 1A IN TO 5VOUT AT 10mA VSYNC = 0V 00.2 0.6 1 1.4 1.8 2.2 2.6 3 SWITCHING FREQUENCY (MHz) 8614 G31
Transient Response; Load Current Transient Response; Load Current Stepped from 100mA (Burst Mode Switching Waveforms Stepped from 1A to 2A Operation) to 1.1A
IL 500mA/DIV ILOAD ILOAD 1A/DIV 1A/DIV VSW VOUT VOUT 5V/DIV 100mV/DIV 200mV/DIV 200ns/DIV 8614 G34 50µs/DIV 8614 G35 50µs/DIV 8614 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 36VIN TO 5VOUT AT 1A 1A TO 2A TRANSIENT 100mA (Burst Mode OPERATION) TO 12VIN, 5VOUT 1.1A TRANSIENT COUT = 47µF 12VIN, 5VOUT COUT = 47µF Rev. F For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts