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LT3430 Datasheet(PDF) 3 Page - Linear Technology |
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LT3430 Datasheet(HTML) 3 Page - Linear Technology |
3 / 28 page LT3430/LT3430-1 3 34301fa 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: 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 bias supply current (IBIAS): ITOTAL = IVIN + (IBIAS)(VOUT/VIN) With VIN = 15V, VOUT = 5V, IVIN = 1.4mA, IBIAS = 2.9mA, ITOTAL = 2.4mA. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VC = 1.5V, ⎯S⎯H⎯D⎯N = 1V, BOOST = Open Circuit, SW = Open Circuit, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Maximum Switch Duty Cycle (LT3430-1) ● 96 94 98 % % Switch Frequency (LT3430) VC Set to Give DC = 50% ● 184 172 200 200 216 228 kHz kHz Switch Frequency (LT3430-1) ● 88 85 100 100 115 120 kHz kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V ● 0.05 0.15 %/V fSW Shifting Threshold Df = 10kHz 0.8 V Minimum Input Voltage (Note 3) ● 4.6 5.5 V Minimum Boost Voltage (Note 4) ISW ≤ 2.5A ● 1.8 3 V Boost Current (Note 5) Boost = VIN + 5V, ISW = 0.75A Boost = VIN + 5V, ISW = 2.5A ● ● 25 75 50 120 mA mA Input Supply Current (IVIN) (Note 6) VBIAS = 5V 1.5 2.2 mA Bias Supply Current (IBIAS) (Note 6) VBIAS = 5V 3.1 4.2 mA Shutdown Supply Current ⎯S⎯H⎯D⎯N = 0V, VIN ≤ 60V, SW = 0V, VC Open ● 30 100 200 µA µA Lockout Threshold VC Open ● 2.3 2.42 2.53 V Shutdown Threshold VC Open, Shutting Down VC Open, Starting Up ● ● 0.15 0.25 0.37 0.42 0.58 0.60 V V Minimum SYNC Amplitude 1.5 V SYNC Frequency Range (LT3430) 228 700 kHz SYNC Frequency Range (LT3430-1) 125 250 kHz SYNC Input Resistance 20 kΩ Note 7: Switch on resistance is calculated by dividing VIN to SW voltage by the forced current (3A). See Typical Performance Characteristics for the graph of switch voltage at other currents. Note 8: The LT3430EFE/LT3430EFE-1 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 LT3430IFE/LT3430IFE-1 are guaranteed over the full –40°C to 125°C operating junction temperature range. Note 9: See Peak Switch Current Limit vs Junction Temperature graph in the Typical Performance Characteristics section. 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. Note 11: The maximum operational Boost-SW voltage is limited by thermal and load current constraints. See ‘Boost Pin’ and ‘Thermal Calculations’ in the Applications Information section. |
Similar Part No. - LT3430_15 |
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Similar Description - LT3430_15 |
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