Datasheet LT8625S (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference |
| Pages / Page | 39 / 10 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 4.9 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Waveforms, Full
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LT8625S
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Waveforms, Full Switching Waveforms, Pulse- Switch Rising Edge Frequency Continuous Operation Skipping Operation
IL 1A/DIV IL 500mA/DIV VSW 2V/DIV VSW 5V/DIV VSW 5V/DIV 5ns/DIV 8625s G43 500ns/DIV 8625s G44 1µs/DIV 8625s G45 VIN = 12V ILOAD = 6A 12VIN TO 1VOUT AT 5A 12VIN TO 1VOUT AT 100mA fSW = 2MHz VSYNC = 0V
Transient Response: Load Current Transient Response: Load Current CLKOUT Waveforms Stepped from 2A to 5A Stepped from 100mA to 3.1A
VCLKOUT I 2V/DIV LOAD ILOAD 2A/DIV 2A/DIV VSYNC PULSE-SKIPPING MODE 2V/DIV VOUT VOUT 50mV/DIV VSW 50mV/DIV 5V/DIV FC MODE 200ns/DIV 8625s G46 10µs/DIV 8625s G47 20µs/DIV 8625s G48 fSW = 1MHz, PVIN = 5V, VOUT = 1V, ILOAD = 3A PVIN = 12V, VOUT = 1V, fSW = 2MHz PVIN = 12V, VOUT = 1V, fSW = 2MHz SYNCRHONIZATION MODE C C V C = 2.2nF, RC = 1k C = 2.2nF, RC = 1k PHMODE = 0V COUT = 2× 100µF + 2× 22µF COUT = 2× 100µF + 2× 22µF
Start-Up Dropout Performance Start-Up Dropout Performance LT8625S Case Temperature Rise
80 DEMO BOARD DC3002A VIN VIN ON STILL AIR 70 PVIN = 12V SV (FAST START-UP IN = 3.3V 60 V (FAST START-UP IN V ENDS HERE) VIN OUT = 1V 1V/DIV ENDS HERE) 1V/DIV 50 VOUT VOUT VOUT VOUT TURE RISE (°C) 40 1V/DIV 1V/DIV 30 20 CASE TEMPERA 100ms/DIV 8625s G49 100ms/DIV 8625s G50 10 1MHz 2MHz 1Ω LOAD 20Ω LOAD 0 (4A IN REGULATION) (200mA IN REGULATION) 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) 8625s G51 Rev. B 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Waveforms, Full Switching Waveforms, Pulse- Switch Rising Edge Frequency Continuous Operation Skipping Operation
IL 1A/DIV IL 500mA/DIV VSW 2V/DIV VSW 5V/DIV VSW 5V/DIV 5ns/DIV 8625s G43 500ns/DIV 8625s G44 1µs/DIV 8625s G45 VIN = 12V ILOAD = 6A 12VIN TO 1VOUT AT 5A 12VIN TO 1VOUT AT 100mA fSW = 2MHz VSYNC = 0V
Transient Response: Load Current Transient Response: Load Current CLKOUT Waveforms Stepped from 2A to 5A Stepped from 100mA to 3.1A
VCLKOUT I 2V/DIV LOAD ILOAD 2A/DIV 2A/DIV VSYNC PULSE-SKIPPING MODE 2V/DIV VOUT VOUT 50mV/DIV VSW 50mV/DIV 5V/DIV FC MODE 200ns/DIV 8625s G46 10µs/DIV 8625s G47 20µs/DIV 8625s G48 fSW = 1MHz, PVIN = 5V, VOUT = 1V, ILOAD = 3A PVIN = 12V, VOUT = 1V, fSW = 2MHz PVIN = 12V, VOUT = 1V, fSW = 2MHz SYNCRHONIZATION MODE C C V C = 2.2nF, RC = 1k C = 2.2nF, RC = 1k PHMODE = 0V COUT = 2× 100µF + 2× 22µF COUT = 2× 100µF + 2× 22µF
Start-Up Dropout Performance Start-Up Dropout Performance LT8625S Case Temperature Rise
80 DEMO BOARD DC3002A VIN VIN ON STILL AIR 70 PVIN = 12V SV (FAST START-UP IN = 3.3V 60 V (FAST START-UP IN V ENDS HERE) VIN OUT = 1V 1V/DIV ENDS HERE) 1V/DIV 50 VOUT VOUT VOUT VOUT TURE RISE (°C) 40 1V/DIV 1V/DIV 30 20 CASE TEMPERA 100ms/DIV 8625s G49 100ms/DIV 8625s G50 10 1MHz 2MHz 1Ω LOAD 20Ω LOAD 0 (4A IN REGULATION) (200mA IN REGULATION) 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) 8625s G51 Rev. B 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
