Datasheet LT8645S-2 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 65V, 8A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| 页数 / 页 | 30 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Input Voltage. Minimum Input … |
| 修订版 | A |
| 文件格式/大小 | PDF / 3.3 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Input Voltage. Minimum Input V. Bias Pin Current. Switching Waveforms, Full
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LT8645S-2
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input Voltage Minimum Input V Bias Pin Current Bias Pin Current
3.6 15 30 VBIAS = 5V V 3.4 OUT = 5V 25 14 VIN = 12V ILOAD = 1A 3.2 20 13 TAGE (V) 3.0 15 12 2.8 INPUT VOL 10 BIAS PIN CURRENT (mA) BIAS PIN CURRENT (mA) 11 2.6 VBIAS = 5V 5 VOUT = 5V fSW = 1MHz 2.4 10 0 –50 –25 0 25 50 75 100 125 150 5 15 25 35 45 55 65 0.2 0.6 1 1.4 1.8 2.2 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHz) 8645S-2 G28 8645S-2 G29 8645S-2 G30
Switching Waveforms, Full Case Temperature Rise Switch Rising Edge Frequency Continuous Operation
80 DC2468A DEMO BOARD 70 VIN = 12V, fSW = 500kHz VIN = 24V, fSW = 500kHz IL 60 VIN = 12V, fSW = 2MHz 1A/DIV VIN = 24V, fSW = 2MHz 50 VSW 2V/DIV TURE RISE (°C) 40 VSW 5V/DIV 30 20 CASE TEMPERA 8645S-2 G32 8645S-2 G33 10 2ns/DIV 500ns/DIV VIN = 12V I FRONT PAGE APPLICATION 0 LOAD = 3A 12VIN TO 5VOUT AT 2A 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) 8645S-2 G31
Switching Waveforms, Burst Transient Response; Internal Mode Operation Switching Waveforms Compensation Internal Compensation
ILOAD IL IL 2A/DIV 500mA/DIV 1A/DIV VOUT V 100mV/DIV SW VSW 5V/DIV 20V/DIV 10µs/DIV 8645S-2 G34 500ns/DIV 8645S-2 G35 20µs/DIV 8645S-2 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 12VIN TO 5VOUT AT 10mA 48VIN TO 5VOUT AT 2A 12V V IN, 5VOUT, fSW = 2MHz SYNC = 0V COUT = 100µF, CLEAD = 4.7pF Rev. A 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input Voltage Minimum Input V Bias Pin Current Bias Pin Current
3.6 15 30 VBIAS = 5V V 3.4 OUT = 5V 25 14 VIN = 12V ILOAD = 1A 3.2 20 13 TAGE (V) 3.0 15 12 2.8 INPUT VOL 10 BIAS PIN CURRENT (mA) BIAS PIN CURRENT (mA) 11 2.6 VBIAS = 5V 5 VOUT = 5V fSW = 1MHz 2.4 10 0 –50 –25 0 25 50 75 100 125 150 5 15 25 35 45 55 65 0.2 0.6 1 1.4 1.8 2.2 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHz) 8645S-2 G28 8645S-2 G29 8645S-2 G30
Switching Waveforms, Full Case Temperature Rise Switch Rising Edge Frequency Continuous Operation
80 DC2468A DEMO BOARD 70 VIN = 12V, fSW = 500kHz VIN = 24V, fSW = 500kHz IL 60 VIN = 12V, fSW = 2MHz 1A/DIV VIN = 24V, fSW = 2MHz 50 VSW 2V/DIV TURE RISE (°C) 40 VSW 5V/DIV 30 20 CASE TEMPERA 8645S-2 G32 8645S-2 G33 10 2ns/DIV 500ns/DIV VIN = 12V I FRONT PAGE APPLICATION 0 LOAD = 3A 12VIN TO 5VOUT AT 2A 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) 8645S-2 G31
Switching Waveforms, Burst Transient Response; Internal Mode Operation Switching Waveforms Compensation Internal Compensation
ILOAD IL IL 2A/DIV 500mA/DIV 1A/DIV VOUT V 100mV/DIV SW VSW 5V/DIV 20V/DIV 10µs/DIV 8645S-2 G34 500ns/DIV 8645S-2 G35 20µs/DIV 8645S-2 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 12VIN TO 5VOUT AT 10mA 48VIN TO 5VOUT AT 2A 12V V IN, 5VOUT, fSW = 2MHz SYNC = 0V COUT = 100µF, CLEAD = 4.7pF Rev. A 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts