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LTC3894 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3894 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3894 3 Rev 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ(VINR) Total Input Supply Current in Regulation at No Load in Burst Mode (Note 7) VIN = 12V Figure 13 Circuit, VOUT = 3.3V Figure 11 Circuit, VOUT = 5V 16 22 µA µA VIN = 48V Figure 13 Circuit, VOUT = 3.3V Figure 11 Circuit, VOUT = 5V 9 11 µA µA Output Sensing VFB Regulated Feedback Voltage VITH = 1.2V (Note 8) l 0.788 0.800 0.812 V Feedback Voltage Line Regulation VIN = 4.5V to 150V (Note 8) ±0.002 0.015 %/V Feedback Voltage Load Regulation VITH = 0.6V to 1.8V (Note 8) 0.03 0.15 % gm(EA) Error Amplifier Transconductance VITH = 1.2V, ∆IITH = ±5µA (Note 8) 2 mS IFB Feedback Input Bias Current –10 ±50 nA Current Sensing VSENSE(MAX) Maximum Current Sense Threshold (VSENSE+ – VSENSE–) VFB = 0.7V, VSENSE– = 3.3V l 88 100 112 mV ISENSE+ SENSE+ Pin Input Current VSENSE+ = 3.3V 0.1 1 µA ISENSE– SENSE– Pin Input Current in Non-Sleep Mode (Note 6) VSENSE– = 3.3V VSENSE– = 5V 200 880 300 1260 µA µA Start-Up and Shutdown VRUN RUN Pin Enable Threshold VRUN Rising l 1.14 1.24 1.34 V VRUNHYS RUN Pin Hysteresis 125 mV ISS Soft-Start Pin Charging Current VSS = 0V or 0V to 0.8V 8 11 14 µA VOVLO Overvoltage Lockout Threshold VOVLO Rising Up Hysteresis l 0.77 0.8 30 0.82 V mV Gate Driver and VIN-Cap LDO VUVLO Undervoltage Lockout DRVUV = 0 (VIN-VCAP) Ramping Up Threshold (VIN-VCAP) Ramping Down Threshold Hysteresis l l 3.4 3.25 3.75 3.50 0.25 4.3 3.75 V V V DRVUV = Floating (VIN-VCAP) Ramping Up Threshold (VIN-VCAP) Ramping Down Threshold Hysteresis l l 5.65 5.2 6.0 5.55 0.45 6.45 5.85 V V V VCAP Gate Bias LDO Output Voltage (VIN-VCAP) ICAP = 0mA, 9V ≤ VIN ≤ 150V (Note 9) l 7.5 8.0 8.5 V VCAPDROP Gate Bias LDO Dropout Voltage (VIN-VCAP) VIN = 5V, ICAP = 15mA (Note 9) 4.1 4.4 V ∆VCAP(LOAD) Gate Bias LDO Load Regulation ICAP = 0mA to 20mA –2.8 –1.3 % RUP Gate Pull-Up Resistance Gate High 2 Ω RDN Gate Pull-Down Resistance Gate Low 0.9 Ω tON(MIN) Gate Minimum On-Time (Note 10) 125 ns Switching Frequency and Clock Synchronization f Programmable Switching Frequency RFREQ = 25kΩ RFREQ = 64.9kΩ RFREQ = 105kΩ 375 100 440 810 505 kHz kHz kHz |
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