LT3433 ELECTRICAL CHARACTERISTICSThe ● denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25 ° C.VIN = 13.8V, VFB = 1.25V, VOUT = 5V, VBURST_EN = 0V, VBST – VIN = 5V, unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS VFB Feedback Reference Voltage 1.224 1.231 1.238 V ● 1.215 1.245 V ∆VFB Feedback Reference Line Regulation 5.5V ≤ VIN ≤ 60V ● 0.002 0.01 %/V IFB VFB Pin Input Bias Current ● 35 100 nA gm Error Amplifier Transconductance ● 200 270 330 umhos AV Error Amplifier Voltage Gain 66 dB ISW/VVC Control Voltage to Switch Transconductance 0.6 A/V fO Operating Frequency VFB > 1V 185 200 215 kHz ● 170 230 kHz Foldback Frequency VFB = 0V 50 kHz VBURST_EN Burst Enable Threshold 0.8 V IBURST_EN Input Bias Current VBURST_EN ≥ 2V 35 µA tON(MIN) Minimum Switch On Time RL = 35Ω (Note 4) ● 250 450 ns tOFF(MIN) Minimum Switch Off Time RL = 35Ω (Note 4) ● 500 800 ns Note 1: Absolute Maximum Ratings are those values beyond which the life Note 5: This IC includes overtemperature protection that is intended to of a device may be impaired. protect the device during momentary overload conditions. Junction Note 2: Supply current specification does not include switch drive temperature will exceed 125°C when overtemperature protection is active. currents. Actual supply currents will be higher. Continuous operation above the specified maximum operating junction Note 3: “Normal Operation” supply current specification does not include temperature may impair device reliability. I Note 6: The LT3433E is guaranteed to meet performance specifications BIAS currents. Powering the VBIAS pin externally reduces ICC supply current. from 0°C to 125°C junction temperature. Specifications over the – 40°C to Note 4: Minimum times are tested using the high side switch with a 35Ω 125°C operating junction temperature range are assured by design, load to ground. characterization and correlation with statistical process controls. The LT3433I is guaranteed over the full –40°C to 125°C operating junction temperature range. WUTYPICAL PERFOR A CE CHARACTERISTICSMaximum Output CurrentVBIAS Output VoltageVIN Supply Currentvs Vvs Temperaturevs VININ Supply Voltage 500 2.8 620 VOUT = 5V TA = 25°C TA = 25°C BUCK 400 590 2.6 300 µA) ( 560 I VIN 200 OUTPUT VOLTAGE (V) 2.4 BRIDGED BIAS 530 V 100 SEE TYPICAL APPLICATION MAXIMUM OUTPUT CURRENT (mA) ON THE FIRST PAGE OF THIS DATA SHEET 0 2.2 500 0 10 20 30 40 50 60 –50 0 50 100 125 0 15 30 45 60 V TEMPERATURE (°C) V IN (V) IN (V) 3433 G11 3433 G01 3433 G02 3433f 3
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