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LT3800IFE-PBF Datasheet(PDF) 5 Page - Linear Technology |
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LT3800IFE-PBF Datasheet(HTML) 5 Page - Linear Technology |
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5 / 24 page  LT3800 5 3800fb Operating Frequency vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS PI FU CTIO S VIN (Pin 1): Converter Input Supply. NC (Pin 2): No Connection. SHDN (Pin 3): Precision Shutdown Pin. Enable threshold is 1.35V (rising) with 120mV of input hysteresis. When in shutdown mode, all internal IC functions are disabled. The precision threshold allows use of the SHDN pin to incor- porate UVLO functions. If the SHDN pin is pulled below 0.7V, the IC enters a low current shutdown mode with IVIN < 10µA. In low-current shutdown, the IC will sink 20µA from the VCC pin until that local supply has collapsed. Typical pin input bias current is <10nA and the pin is internally clamped to 6V. CSS (Pin 4): Soft-Start AC Coupling Capacitor Input. Connect capacitor (CSS) in series with a 200k resistor from pin to converter output (VOUT). Controls converter start- up output voltage slew rate ( ∆VOUT/∆t). Slew rate corre- sponds to 2 µA average current through the soft-start coupling capacitor. The capacitor value for a desired output startup slew rate follows the relation: CSS = 2µA/(∆VOUT/∆t) Shorting this pin to SGND disables the soft-start function BURST_EN (Pin 5): Burst Mode Operation Enable Pin. This pin also controls reverse-inhibit mode of operation. When the pin voltage is below 0.5V, Burst Mode operation Error Amp Reference vs Temperature I(SENSE+ + SENSE–) vs VSENSE(CM) VSENSE(CM) (V) 0 0.5 1.5 2.5 3.5 4.5 800 600 400 200 0 –200 –400 1.0 2.0 3.0 4.0 3800 G09 5.0 TA = 25°C TEMPERATURE ( °C) 3800 G10 –50 220 210 200 190 180 –25 100 0 50 125 25 75 –50 –25 100 0 50 125 25 75 TEMPERATURE ( °C) 1.232 1.231 1.230 1.229 1.228 1.227 3800 G11 VCC UVLO Threshold (Rising) vs Temperature Error Amp Transconductance vs Temperature TEMPERATURE ( °C) –50 –25 100 3800 G07 0 50 125 25 75 6.30 6.25 6.20 6.15 ICC vs VCC (SHDN = 0V) VCC (V) 0 15 20 25 16 3800 G12 10 5 0 246 810 12 14 18 20 TA = 25°C TEMPERATURE ( °C) –50 –25 100 0 50 125 25 75 380 360 340 320 3800 G08 |
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