Datasheet LT3697 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation |
| Seiten / Seite | 32 / 7 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 451 Kb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Frequency Foldback. Burst Frequency
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LT3697
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Frequency Foldback Burst Frequency Error Amp Output Current
450 500 100 RT = 255k RT = 255k 450 L = 8.2µH 75 400 400 50 350 350 300 25 300 250 0 200 –25 250 150 VC PIN CURRENT (µA) –50 SWITCHING FREQUENCY (kHz) 100 200 SWITCHING FREQUENCY (kHz) VIN = 12V 50 VIN = 24V –75 VIN = 36V 150 0 –100 0 1 2 3 4 5 6 0 20 40 60 80 100 120 140 160 –200 –100 0 100 200 VSYS (V) LOAD CURRENT (mA) OFFSET FROM NOMINAL USB5V VOLTAGE (mV) 3697 G19 3697 G20 3697 G21
Minimum On-Time Minimum Off-Time Minimum Off-Time in SYNC
180 170 220 210 160 160 200 2.1A LOAD 0.9A LOAD 140 190 2.1A LOAD 150 180 120 170 2.1A LOAD 0.9A LOAD MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 140 MINIMUM OFF-TIME (ns) 160 100 0.9A LOAD 150 FSYNC = 2.2MHz 80 130 140 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3697 G22 3697 G23 3697 G24
Enable Threshold Start-Up/Dropout Performance Start-Up/Dropout Performance
2.00 EN RISING RLOAD = 2Ω RLOAD = 100Ω EN FALLING (2.5A IN REGULATION) (50mA IN REGULATION) 1.80 RCBL = ∞ R V CBL = ∞ IN VIN 1.60 TAGE (V) 1.40 V VOUT 2V/DIV OUT 2V/DIV EN PIN VOL 1.20 1.00 0.80–50 –25 0 25 50 75 100 125 150 100ms/DIV 100ms/DIV TEMPERATURE (°C) 3697 G26 3697 G27 3697 G25 3697f 7 For more information www.linear.com/LT3697
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Frequency Foldback Burst Frequency Error Amp Output Current
450 500 100 RT = 255k RT = 255k 450 L = 8.2µH 75 400 400 50 350 350 300 25 300 250 0 200 –25 250 150 VC PIN CURRENT (µA) –50 SWITCHING FREQUENCY (kHz) 100 200 SWITCHING FREQUENCY (kHz) VIN = 12V 50 VIN = 24V –75 VIN = 36V 150 0 –100 0 1 2 3 4 5 6 0 20 40 60 80 100 120 140 160 –200 –100 0 100 200 VSYS (V) LOAD CURRENT (mA) OFFSET FROM NOMINAL USB5V VOLTAGE (mV) 3697 G19 3697 G20 3697 G21
Minimum On-Time Minimum Off-Time Minimum Off-Time in SYNC
180 170 220 210 160 160 200 2.1A LOAD 0.9A LOAD 140 190 2.1A LOAD 150 180 120 170 2.1A LOAD 0.9A LOAD MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 140 MINIMUM OFF-TIME (ns) 160 100 0.9A LOAD 150 FSYNC = 2.2MHz 80 130 140 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3697 G22 3697 G23 3697 G24
Enable Threshold Start-Up/Dropout Performance Start-Up/Dropout Performance
2.00 EN RISING RLOAD = 2Ω RLOAD = 100Ω EN FALLING (2.5A IN REGULATION) (50mA IN REGULATION) 1.80 RCBL = ∞ R V CBL = ∞ IN VIN 1.60 TAGE (V) 1.40 V VOUT 2V/DIV OUT 2V/DIV EN PIN VOL 1.20 1.00 0.80–50 –25 0 25 50 75 100 125 150 100ms/DIV 100ms/DIV TEMPERATURE (°C) 3697 G26 3697 G27 3697 G25 3697f 7 For more information www.linear.com/LT3697