Datasheet LT3724 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Voltage, Current Mode Switching Regulator Controller |
| Pages / Page | 26 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 322 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT3724
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, SENSE– = SENSE+ = 10V, SGND = PGND = SW = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VBOOST Operating Voltage Range l 75 V Operating Voltage Range (Note 5) VBOOST - VSW l 20 V UVLO Threshold (Rising) VBOOST - VSW 5 V UVLO Threshold Hysteresis VBOOST - VSW 400 mV IBOOST BOOST Supply Current (Note 6) 1.4 mA BOOST Burst Mode Current VBURST_EN = 0V 0.1 µA BOOST Shutdown Current VSHDN = 0V 0.1 µA VCC Operating Voltage Range (Note 5) l 20 V Output Voltage Over Full Line and Load Range l 8 8.3 V UVLO Threshold (Rising) 6.25 V UVLO Threshold Hysteresis 500 mV IVCC VCC Supply Current (Note 6) l 1.7 2.1 mA VCC Burst Mode Current VBURST_EN = 0V 80 µA VCC Shutdown Current VSHDN = 0V 20 µA Short-Circuit Current l –30 –55 mA VFB Error Amp Reference Voltage Measured at VFB Pin 1.224 1.231 1.238 V l 1.215 1.245 V IFB Feedback Input Current 25 nA VSHDN Enable Threshold (Rising) l 1.3 1.35 1.4 V Threshold Hysteresis 120 mV VSENSE Common Mode Range l 0 36 V Current Limit Sense Voltage V + – SENSE – VSENSE l 140 150 175 mV ISENSE Input Current VSENSE(CM) = 0V 400 µA (I + – SENSE + ISENSE ) VSENSE(CM) = 2.5V 2 µA VSENSE(CM) > 4V –150 µA fSW Operating Frequency 190 200 210 kHz l 175 220 kHz MP Grade l 165 200 225 kHz VFB(SS) Soft-Start Disable Voltage VFB Rising 1.185 V Soft-Start Disable Hysteresis 300 mV ISS Soft-Start Capacitor Control Current 2 µA gm Error Amp Transconductance l 275 340 400 µmhos AV Error Amp DC Voltage Gain 62 dB VC Error Amp Output Range Zero Current to Current Limit 1.2 V IVC Error Amp Sink/Source Current ±30 µA VTG Gate Drive Output On Voltage (Note 7) CLOAD = 3300pF 9.8 V Gate Drive Output Off Voltage CLOAD = 3300pF 0.1 V tTG Gate Drive Rise/Fall Time 10% to 90% or 90% to 10%, CLOAD = 3300pF 60 ns tTG(OFF) Minimum Switch Off Time 350 ns tTG(ON) Minimum Switch On Time l 300 500 ns ISW SW Pin Sink Current VSW = 2V 300 mA 3724fd 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, SENSE– = SENSE+ = 10V, SGND = PGND = SW = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VBOOST Operating Voltage Range l 75 V Operating Voltage Range (Note 5) VBOOST - VSW l 20 V UVLO Threshold (Rising) VBOOST - VSW 5 V UVLO Threshold Hysteresis VBOOST - VSW 400 mV IBOOST BOOST Supply Current (Note 6) 1.4 mA BOOST Burst Mode Current VBURST_EN = 0V 0.1 µA BOOST Shutdown Current VSHDN = 0V 0.1 µA VCC Operating Voltage Range (Note 5) l 20 V Output Voltage Over Full Line and Load Range l 8 8.3 V UVLO Threshold (Rising) 6.25 V UVLO Threshold Hysteresis 500 mV IVCC VCC Supply Current (Note 6) l 1.7 2.1 mA VCC Burst Mode Current VBURST_EN = 0V 80 µA VCC Shutdown Current VSHDN = 0V 20 µA Short-Circuit Current l –30 –55 mA VFB Error Amp Reference Voltage Measured at VFB Pin 1.224 1.231 1.238 V l 1.215 1.245 V IFB Feedback Input Current 25 nA VSHDN Enable Threshold (Rising) l 1.3 1.35 1.4 V Threshold Hysteresis 120 mV VSENSE Common Mode Range l 0 36 V Current Limit Sense Voltage V + – SENSE – VSENSE l 140 150 175 mV ISENSE Input Current VSENSE(CM) = 0V 400 µA (I + – SENSE + ISENSE ) VSENSE(CM) = 2.5V 2 µA VSENSE(CM) > 4V –150 µA fSW Operating Frequency 190 200 210 kHz l 175 220 kHz MP Grade l 165 200 225 kHz VFB(SS) Soft-Start Disable Voltage VFB Rising 1.185 V Soft-Start Disable Hysteresis 300 mV ISS Soft-Start Capacitor Control Current 2 µA gm Error Amp Transconductance l 275 340 400 µmhos AV Error Amp DC Voltage Gain 62 dB VC Error Amp Output Range Zero Current to Current Limit 1.2 V IVC Error Amp Sink/Source Current ±30 µA VTG Gate Drive Output On Voltage (Note 7) CLOAD = 3300pF 9.8 V Gate Drive Output Off Voltage CLOAD = 3300pF 0.1 V tTG Gate Drive Rise/Fall Time 10% to 90% or 90% to 10%, CLOAD = 3300pF 60 ns tTG(OFF) Minimum Switch Off Time 350 ns tTG(ON) Minimum Switch On Time l 300 500 ns ISW SW Pin Sink Current VSW = 2V 300 mA 3724fd 3
