Datasheet LT8641 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 26 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. Frequency. … |
| Revision | C |
| File Format / Size | PDF / 3.4 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. RT Programmed Switching. Frequency. VIN UVLO. Minimum Input Voltage. Bias Pin Current
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LT8641
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching Frequency VIN UVLO Minimum Input Voltage Bias Pin Current
250 3.2 7.5 V 225 BIAS = 5V VOUT = 5V 3.0 7.0 200 ILOAD = 1A f 175 SW = 1MHz 2.8 6.5 150 TAGE (V) 125 2.6 6.0 100 2.4 5.5 RT PIN RESISTOR (kΩ) 75 INPUT VOL BIAS PIN CURRENT (mA) 50 2.2 5.0 25 0 2.0 4.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –50 –25 0 25 50 75 100 125 150 5 15 25 35 45 55 65 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8641 G29 8641 G30 8641 G28
Case Temperature Rise vs 5A Bias Pin Current Case Temperature Rise Case Temperature Rise Pulsed Load
20 60 90 VBIAS = 5V DC2373A DEMO BOARD DC2373A DEMO BOARD VOUT = 5V 80 VIN = 12V V V IN = 12V 50 IN = 12V, fSW = 1MHz V VOUT = 5V 15 I 70 LOAD = 1A IN = 24V, fSW = 1MHz V fSW = 2MHz IN = 12V, fSW = 2MHz STANDBY LOAD = 0.25A 40 VIN = 24V, fSW = 2MHz 60 1kHz PULSED LOAD = 5A 50 10 TURE RISE (°C) 30 TURE RISE (°C) 40 20 30 BIAS PIN CURRENT (mA) 5 20 CASE TEMPERA 10 CASE TEMPERA 10 0 0 0 0.2 0.6 1.0 1.4 1.8 2.2 2.6 3.0 0 0.5 1 1.5 2 2.5 3 3.5 0 0.2 0.4 0.6 0.8 SWITCHING FREQUENCY (MHz) LOAD CURRENT (A) DUTY CYCLE OF 5A LOAD 8641 G31 8641 G32 8641 G33
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL 1A/DIV I I L L 500mA/DIV 1A/DIV VSW VSW VSW 5V/DIV 5V/DIV 20V/DIV 500ns/DIV 8641 G34 10µs/DIV 8641 G35 500ns/DIV 8641 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12VIN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 10mA 48VIN TO 5VOUT AT 1A VSYNC = 0V Rev. C For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics 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 RT Programmed Switching Frequency VIN UVLO Minimum Input Voltage Bias Pin Current
250 3.2 7.5 V 225 BIAS = 5V VOUT = 5V 3.0 7.0 200 ILOAD = 1A f 175 SW = 1MHz 2.8 6.5 150 TAGE (V) 125 2.6 6.0 100 2.4 5.5 RT PIN RESISTOR (kΩ) 75 INPUT VOL BIAS PIN CURRENT (mA) 50 2.2 5.0 25 0 2.0 4.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –50 –25 0 25 50 75 100 125 150 5 15 25 35 45 55 65 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8641 G29 8641 G30 8641 G28
Case Temperature Rise vs 5A Bias Pin Current Case Temperature Rise Case Temperature Rise Pulsed Load
20 60 90 VBIAS = 5V DC2373A DEMO BOARD DC2373A DEMO BOARD VOUT = 5V 80 VIN = 12V V V IN = 12V 50 IN = 12V, fSW = 1MHz V VOUT = 5V 15 I 70 LOAD = 1A IN = 24V, fSW = 1MHz V fSW = 2MHz IN = 12V, fSW = 2MHz STANDBY LOAD = 0.25A 40 VIN = 24V, fSW = 2MHz 60 1kHz PULSED LOAD = 5A 50 10 TURE RISE (°C) 30 TURE RISE (°C) 40 20 30 BIAS PIN CURRENT (mA) 5 20 CASE TEMPERA 10 CASE TEMPERA 10 0 0 0 0.2 0.6 1.0 1.4 1.8 2.2 2.6 3.0 0 0.5 1 1.5 2 2.5 3 3.5 0 0.2 0.4 0.6 0.8 SWITCHING FREQUENCY (MHz) LOAD CURRENT (A) DUTY CYCLE OF 5A LOAD 8641 G31 8641 G32 8641 G33
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL 1A/DIV I I L L 500mA/DIV 1A/DIV VSW VSW VSW 5V/DIV 5V/DIV 20V/DIV 500ns/DIV 8641 G34 10µs/DIV 8641 G35 500ns/DIV 8641 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12VIN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 10mA 48VIN TO 5VOUT AT 1A VSYNC = 0V Rev. C For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts
