Datasheet LT8640S, LT8643S (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5µA Quiescent Current |
| Pages / Page | 30 / 9 — Typical perForMance characTerisTics. Case Temperature Rise vs 7A. Case … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
Typical perForMance characTerisTics. Case Temperature Rise vs 7A. Case Temperature Rise. Pulsed Load. Switching Rising Edge
Model Line for this Datasheet
Text Version of Document
LT8640S/LT8643S
Typical perForMance characTerisTics Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 90 DC2530A DEMO BOARD DC2530A DEMO BOARD 70 V 80 V IN = 12V, fSW = 1MHz IN = 12V V V IN = 24V, fSW = 1MHz OUT = 5V 60 70 V f IN = 12V, fSW = 2MHz SW = 2MHz V STANDBY LOAD = 0.25A IN = 24V, fSW = 2MHz 50 60 V 1kHz PULSED LOAD = 7A SW 2V/DIV TURE RISE (°C) 50 40 TURE RISE (°C) 40 30 30 20 CASE TEMPERA 20 8640S G39 CASE TEMPERA 10 2ns/DIV 10 VIN = 12V 0 ILOAD = 2A 0 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8640S G37 8640S G38
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL I 1A/DIV L IL 1A/DIV 500mA/DIV VSW V 5V/DIV V SW SW 10V/DIV 5V/DIV 500ns/DIV 8640S G40 5µs/DIV 8640S G41 500ns/DIV 8640S G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 12V 36V IN TO 5VOUT AT 1A IN TO 5VOUT AT 10mA IN TO 5VOUT AT 1A VSYNC = 0V
LT8640S Transient Response; LT8643S Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8640S G43 20µs/DIV 8640S G44 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz COUT = 100µF, CLEAD = 10pF CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 4.7pF 8640sfa For more information www.linear.com/LT8640S 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
Typical perForMance characTerisTics Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 90 DC2530A DEMO BOARD DC2530A DEMO BOARD 70 V 80 V IN = 12V, fSW = 1MHz IN = 12V V V IN = 24V, fSW = 1MHz OUT = 5V 60 70 V f IN = 12V, fSW = 2MHz SW = 2MHz V STANDBY LOAD = 0.25A IN = 24V, fSW = 2MHz 50 60 V 1kHz PULSED LOAD = 7A SW 2V/DIV TURE RISE (°C) 50 40 TURE RISE (°C) 40 30 30 20 CASE TEMPERA 20 8640S G39 CASE TEMPERA 10 2ns/DIV 10 VIN = 12V 0 ILOAD = 2A 0 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8640S G37 8640S G38
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL I 1A/DIV L IL 1A/DIV 500mA/DIV VSW V 5V/DIV V SW SW 10V/DIV 5V/DIV 500ns/DIV 8640S G40 5µs/DIV 8640S G41 500ns/DIV 8640S G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 12V 36V IN TO 5VOUT AT 1A IN TO 5VOUT AT 10mA IN TO 5VOUT AT 1A VSYNC = 0V
LT8640S Transient Response; LT8643S Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8640S G43 20µs/DIV 8640S G44 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz COUT = 100µF, CLEAD = 10pF CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 4.7pF 8640sfa For more information www.linear.com/LT8640S 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
