Datasheet LT3430, LT3430-1 (Analog Devices) - 3

LT3430/LT3430-1
ELECTRICAL CHARACTERISTICS The
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denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TJ = 25°C. VIN = 15V, VC = 1.5V,
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S
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H
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D
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N = 1V, BOOST = Open Circuit, SW = Open Circuit, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Switch Duty Cycle (LT3430-1) 96 98 % ● 94 % Switch Frequency (LT3430) VC Set to Give DC = 50% 184 200 216 kHz ● 172 200 228 kHz Switch Frequency (LT3430-1) 88 100 115 kHz ● 85 100 120 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 ● 25 50 mA Boost = VIN + 5V, ISW = 2.5A ● 75 120 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 µA ● 200 µA Lockout Threshold VC Open ● 2.3 2.42 2.53 V Shutdown Threshold VC Open, Shutting Down ● 0.15 0.37 0.58 V VC Open, Starting Up ● 0.25 0.42 0.60 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 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
Switch on resistance is calculated by dividing VIN to SW voltage may cause permanent damage to the device. Exposure to any Absolute by the forced current (3A). See Typical Performance Characteristics for the Maximum Rating condition for extended periods may affect device graph of switch voltage at other currents. reliability and lifetime.
Note 8:
The LT3430EFE/LT3430EFE-1 are guaranteed to meet performance
Note 2:
Gain is measured with a VC swing equal to 200mV above the low specifi cations from 0°C to 125°C junction temperature. Specifi cations over clamp level to 200mV below the upper clamp level. the –40°C to 125°C operating junction temperature range are assured by
Note 3:
Minimum input voltage is not measured directly, but is guaranteed design, characterization and correlation with statistical process controls. by other tests. It is defi ned as the voltage where internal bias lines are still The LT3430IFE/LT3430IFE-1 are guaranteed over the full –40°C to 125°C regulated so that the reference voltage and oscillator remain constant. operating junction temperature range. Actual minimum input voltage to maintain a regulated output will depend
Note 9:
See Peak Switch Current Limit vs Junction Temperature graph in upon output voltage and load current. See Applications Information. the Typical Performance Characteristics section.
Note 4:
This is the minimum voltage across the boost capacitor needed to
Note 10:
This IC includes overtemperature protection that is intended guarantee full saturation of the internal power switch. to protect the device during momentary overload conditions. Junction
Note 5:
Boost current is the current fl owing into the BOOST pin with the temperature will exceed 125°C when overtemperature protection is active. pin held 5V above input voltage. It fl ows only during switch on time. Continuous operation above the specifi ed maximum operating junction
Note 6:
Input supply current is the quiescent current drawn by the input temperature may impair device reliability. pin when the BIAS pin is held at 5V with switching disabled. Bias supply
Note 11:
The maximum operational Boost-SW voltage is limited by current is the current drawn by the BIAS pin when the BIAS pin is held thermal and load current constraints. See ‘Boost Pin’ and ‘Thermal at 5V. Total input referred supply current is calculated by summing input Calculations’ in the Applications Information section. 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. 34301fa 3