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LTC4257 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4257 Datasheet(HTML) 4 Page - Linear Technology |
4 / 20 page LTC4257 4 4257fb Input Current vs Input Voltage INPUT VOLTAGE (V) 0 1 2 3 –45 –55 4257 G04 –60 –40 –50 EXCLUDES ANY LOAD CURRENT TA = 25°C Normalized UVLO Threshold vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS VOUT Leakage Current Input Current vs Input Voltage INPUT VOLTAGE (V) 0 0 10 20 30 40 50 –10 –20 –30 –40 4257 G01 –50 –60 CLASS 4 CLASS 3 CLASS 2 CLASS 1 CLASS 0 TA = 25°C INPUT VOLTAGE (V) 0 0 0.1 0.2 0.3 0.4 0.5 –2 –4 –6 –8 4357 G02 –10 TA = 25°C INPUT VOLTAGE (V) –12 9.0 9.5 10.5 11.0 11.5 –14 –16 4257 G03 10.0 –18 –20 –22 12.0 85 °C –40 °C CLASS 1 OPERATION Input Current vs Input Voltage 25k Detection Range Input Current vs Input Voltage INPUT VOLTAGE (V) –1 22 V1: V2: 23 25 26 27 –3 –5 4257 G05 24 –7 –9 –6 –10 –2 –4 –8 28 RESISTANCE = DIODES: S1B TA = 25°C = ∆V ∆I V2 – V1 I2 – I1 IEEE UPPER LIMIT IEEE LOWER LIMIT LTC4257 + 2 DIODES LTC4257 ONLY Signature Resistance vs Input Voltage TEMPERATURE ( °C) –40 –2 –1 0 1 2 –20 0 20 40 4257 G06 60 80 APPLICABLE TO TURN-ON AND TURN-0FF THRESHOLDS Power Good Output Low Voltage vs Current CURRENT (mA) 0 2 3 8 4257 G07 1 0 2 4 6 10 4 TA = 25°C VOUT PIN VOLTAGE (V) 0 0 30 60 120 90 20 40 42571 G09 60 VIN = 0V TA = 25°C Current Limit vs Input Voltage INPUT VOLTAGE (V) –40 345 355 –60 4257 G09 335 325 –45 –50 –55 375 365 VOUT = VIN + 5V 85 °C 25 °C –40 °C |
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