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LT1956EFE-5 Datasheet(PDF) 3 Page - Linear Technology |
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LT1956EFE-5 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  3 LT1956/LT1956-5 1956f PARAMETER CONDITIONS MIN TYP MAX UNITS Switch Current Limit VC Open, Boost = VIN + 5V, FB = 1V or VSENSE = 4.1V q 1.5 2 3 A Switch On Resistance ISW = 1.5A, Boost = VIN + 5V (Note 7) 0.2 0.3 Ω q 0.4 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 82 90 % q 75 90 % Switch Frequency VC Set to Give DC = 50% 460 500 540 kHz q 430 570 kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V q 0.05 0.15 %/V fSW Shifting Threshold Df = 10kHz 0.8 V Minimum Input Voltage (Note 3) q 4.6 5.5 V Minimum Boost Voltage (Note 4) ISW ≤ 1.5A q 23 V Boost Current (Note 5) Boost = VIN + 5V, ISW = 0.5A q 12 25 mA Boost = VIN + 5V, ISW = 1.5A q 42 70 mA Input Supply Current (IVIN) (Note 6) VBIAS = 5V 1.4 2.2 mA Output Supply Current (IBIAS) (Note 6) VBIAS = 5V 2.9 4.2 mA Shutdown Supply Current SHDN = 0V, VIN ≤ 60V, SW = 0V, VC Open 25 75 µA q 200 µA Lockout Threshold VC Open q 2.30 2.42 2.53 V Shutdown Thresholds VC Open, Shutting Down q 0.15 0.37 0.6 V VC Open, Starting Up q 0.25 0.45 0.6 V Minimum SYNC Amplitude q 1.5 2.2 V SYNC Frequency Range 580 700 kHz SYNC Input Resistance 20 k Ω The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VC = 1.5V, SHDN = 1V, Boost o/c, SW o/c, unless otherwise noted. ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Gain is measured with a VC swing equal to 200mV above the low clamp level to 200mV below the upper clamp level. Note 3: Minimum input voltage is not measured directly, but is guaranteed by other tests. It is defined as the voltage where internal bias lines are still regulated so that the reference voltage and oscillator remain constant. Actual minimum input voltage to maintain a regulated output will depend upon output voltage and load current. See Applications Information. Note 4: This is the minimum voltage across the boost capacitor needed to guarantee full saturation of the internal power switch. Note 5: Boost current is the current flowing into the BOOST pin with the pin held 5V above input voltage. It flows only during switch on time. Note 6: Input supply current is the quiescent current drawn by the input pin when the BIAS pin is held at 5V with switching disabled. Bias supply current is the current drawn by the BIAS pin when the BIAS pin is held at 5V. Total input referred supply current is calculated by summing input supply current (IVIN) with a fraction of supply current (IBIAS): ITOTAL = IVIN + (IBIAS)(VOUT/VIN) with VIN = 15V, VOUT = 5V, IVIN = 1.4mA, IBIAS = 2.9mA, ITOTAL = 2.4mA. Note 7: Switch on resistance is calculated by dividing VIN to SW voltage by the forced current (1.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents. Note 8: The LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5 are guaranteed to meet performance specifications from 0 °C to 125°C junction temperature. Specifications over the –40 °C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT1956IFE/LT1956IFE-5/ LT1956IGN/LT1956IGN-5 are guaranteed over the full – 40 °C to 125°C operating junction temperature range. Note 9: Transconductance and voltage gain refer to the internal amplifier exclusive of the voltage divider. To calculate gain and transconductance, refer to the SENSE pin on fixed voltage parts. Divide values shown by the ratio VOUT/1.219. Note 10: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125 °C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. |
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