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LTC1871IMSPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC1871IMSPBF Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC1871 4 1871fe ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VINTVCC = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DMAX Maximum Duty Cycle 87 92 97 % I-Grade or H-Grade (Note 2) ● 87 92 97 % fSYNC/fOSC Recommended Maximum Synchronized Frequency Ratio fOSC = 300kHz (Note 6) 1.25 1.30 fOSC = 300kHz (Note 6), I-Grade or H-Grade (Note 2) ● 1.25 1.30 tSYNC(MIN) MODE/SYNC Minimum Input Pulse Width VSYNC = 0V to 5V 25 ns tSYNC(MAX) MODE/SYNC Maximum Input Pulse Width VSYNC = 0V to 5V 0.8/fOSC ns VIL(MODE) Low Level MODE/SYNC Input Voltage 0.3 V I-Grade or H-Grade (Note 2) ● 0.3 V VIH(MODE) High Level MODE/SYNC Input Voltage 1.2 V I-Grade or H-Grade (Note 2) ● 1.2 V RMODE/SYNC MODE/SYNC Input Pull-Down Resistance 50 kΩ VFREQ Nominal FREQ Pin Voltage 0.62 V Low Dropout Regulator VINTVCC INTVCC Regulator Output Voltage VIN = 7.5V 5.0 5.2 5.4 V VIN = 7.5V, I-Grade (Note 2) ● 5.0 5.2 5.4 V VIN = 7.5V, H-Grade (Note 2) ● 4.95 5.2 5.45 V ΔVINTVCC ΔVIN1 INTVCC Regulator Line Regulation 7.5V ≤ VIN ≤ 15V 8 25 mV ΔVINTVCC ΔVIN2 INTVCC Regulator Line Regulation 15V ≤ VIN ≤ 30V 70 200 mV VLDO(LOAD) INTVCC Load Regulation 0 ≤ IINTVCC ≤ 20mA, VIN = 7.5V – 2 –0.2 % VDROPOUT INTVCC Regulator Dropout Voltage VIN = 5V, INTVCC Load = 20mA 280 mV IINTVCC Bootstrap Mode INTVCC Supply Current in Shutdown RUN = 0V, SENSE = 5V 10 20 μA I-Grade (Note 2) ● 30 μA H-Grade (Note 2) ● 50 μA GATE Driver tr GATE Driver Output Rise Time CL = 3300pF (Note 7) 17 100 ns tf GATE Driver Output Fall Time CL = 3300pF (Note 7) 8 100 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC1871E is guaranteed to meet performance specifications from 0°C to 85°C operating temperature. Specifications over the – 40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTC1871I is guaranteed over the full –40°C to 125°C operating temperature range and the LTC1871H is guaranteed over the full –40°C to 150°C operating temperature range. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 110°C/W) Note 4: The dynamic input supply current is higher due to power MOSFET gate charging (QG • fOSC). See Applications Information. Note 5: The LTC1871 is tested in a feedback loop which servos VFB to the reference voltage with the ITH pin forced to the midpoint of its voltage range (0.3V ≤ VITH ≤ 1.2V, midpoint = 0.75V). Note 6: In a synchronized application, the internal slope compensation gain is increased by 25%. Synchronizing to a significantly higher ratio will reduce the effective amount of slope compensation, which could result in subharmonic oscillation for duty cycles greater than 50%. Note 7: Rise and fall times are measured at 10% and 90% levels. |
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