Datasheet LT3800 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | High-Voltage Synchronous Current Mode Step-Down Controller |
| 页数 / 页 | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| 文件格式/大小 | PDF / 265 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LT3800
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, SENSE– = SENSE+ = 10V, SGND = PGND = SW = 0V, CTG = CBG = 3300pF, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
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 (Note 5) ● 20 V Output Voltage ● 8.0 8.3 V UVLO Threshold (Rising) 6.25 V UVLO Hysteresis 500 mV IVCC VCC Supply Current (Note 6) ● 3 3.6 mA VCC Burst Mode Current VBURST_EN = 0V 80 μA VCC Shutdown Current VSHDN = 0V 20 μA Short-Circuit Current ● –40 –120 mA VSHDN Enable Threshold (Rising) ● 1.30 1.35 1.40 V Threshold Hysteresis 120 mV VSENSE Common Mode Range ● 0 36 Current Limit Sense Voltage V + – SENSE – VSENSE ● 140 150 175 mV Reverse Protect Sense Voltage V + – SENSE – VSENSE , VBURST_EN = VCC –150 mV Reverse Current Offset VBURST_EN = 0V or VBURST_EN = VFB 10 mV ISENSE Input Current VSENSE(CM) = 0V 0.8 mA (I + – SENSE + ISENSE ) VSENSE(CM) = 2.75V –20 μA VSENSE(CM) > 4V –0.3 mA fO Operating Frequency 190 200 210 kHz ● 175 220 kHz VFB Error Amp Reference Voltage Measured at VFB Pin 1.224 1.231 1.238 V ● 1.215 1.245 V IFB Feedback Input Current 25 nA VFB(SS) Soft-Start Disable Voltage VFB Rising 1.185 V Soft-Start Disable Hysteresis 300 mV ICSS Soft-Start Capacitor Control Current 2 μA gm Error Amp Transconductance ● 275 350 400 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,BG Gate Drive Output On Voltage (Note 7) 9.8 V Gate Drive Output Off Voltage 0.1 V tTG,BG Gate Drive Rise/Fall Time 10% to 90% or 90% to 10% 50 ns tTG(OFF) Minimum Off Time 450 ns tTG(ON) Minimum On Time ● 300 500 ns tNOL Gate Drive Nonoverlap Time TG Fall to BG Rise 200 ns BG Fall to TG Rise 150 ns 3800fc 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, SENSE– = SENSE+ = 10V, SGND = PGND = SW = 0V, CTG = CBG = 3300pF, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
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 (Note 5) ● 20 V Output Voltage ● 8.0 8.3 V UVLO Threshold (Rising) 6.25 V UVLO Hysteresis 500 mV IVCC VCC Supply Current (Note 6) ● 3 3.6 mA VCC Burst Mode Current VBURST_EN = 0V 80 μA VCC Shutdown Current VSHDN = 0V 20 μA Short-Circuit Current ● –40 –120 mA VSHDN Enable Threshold (Rising) ● 1.30 1.35 1.40 V Threshold Hysteresis 120 mV VSENSE Common Mode Range ● 0 36 Current Limit Sense Voltage V + – SENSE – VSENSE ● 140 150 175 mV Reverse Protect Sense Voltage V + – SENSE – VSENSE , VBURST_EN = VCC –150 mV Reverse Current Offset VBURST_EN = 0V or VBURST_EN = VFB 10 mV ISENSE Input Current VSENSE(CM) = 0V 0.8 mA (I + – SENSE + ISENSE ) VSENSE(CM) = 2.75V –20 μA VSENSE(CM) > 4V –0.3 mA fO Operating Frequency 190 200 210 kHz ● 175 220 kHz VFB Error Amp Reference Voltage Measured at VFB Pin 1.224 1.231 1.238 V ● 1.215 1.245 V IFB Feedback Input Current 25 nA VFB(SS) Soft-Start Disable Voltage VFB Rising 1.185 V Soft-Start Disable Hysteresis 300 mV ICSS Soft-Start Capacitor Control Current 2 μA gm Error Amp Transconductance ● 275 350 400 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,BG Gate Drive Output On Voltage (Note 7) 9.8 V Gate Drive Output Off Voltage 0.1 V tTG,BG Gate Drive Rise/Fall Time 10% to 90% or 90% to 10% 50 ns tTG(OFF) Minimum Off Time 450 ns tTG(ON) Minimum On Time ● 300 500 ns tNOL Gate Drive Nonoverlap Time TG Fall to BG Rise 200 ns BG Fall to TG Rise 150 ns 3800fc 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS