Datasheet LT3840 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | Wide Input Range Synchronous Regulator Controller with Accurate Current Limit |
| Seiten / Seite | 24 / 3 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 292 Kb |
| Dokumentensprache | Englisch |
e lecTrical characTerisTics The. denotes the specifications which apply over the full operating
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LT3840
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Minimum Operating Voltage l 2.5 V VIN Supply Current 20 µA VIN Burst Mode Current VMODE = 0V 20 30 µA VIN Shutdown Current VEN = 0.3V l 0.1 1 µA AUXVIN Minimum Operating Voltage l 2.5 V AUXVIN Overvoltage Lockout l 60 V AUXVIN Supply Current (Note 3) 300 µA AUXVIN Burst Mode Current VMODE = 0V 0.1 µA AUXVIN Shutdown Current VEN = 0.3V 0.1 1 µA EN Enable Threshold (Rising) l 1.20 1.25 1.30 V EN Hysteresis 30 mV EN Pin Bias Current VEN = 1.25V 2 nA UVLO Enable Threshold (Rising) l 1.20 1.25 1.30 V UVLO Hysteresis 45 mV UVLO Pin Bias Current VUVLO = 1.25V 1 nA OVLO Threshold (Rising) l 1.20 1.25 1.30 V OVLO Hysteresis 125 mV OVLO Pin Bias Current VOVLO = 1.25V 1 nA
Voltage Regulation
Regulated FB Voltage E- and I-Grade l 1.237 1.250 1.263 V Regulated FB Voltage MP- and H-Grade l 1.232 1.250 1.263 V FB Overvoltage Protection % Above FB Voltage l 8 12 16 % FB Overvoltage Protection Hysteresis 2.5 % FB Input Bias Current 5 20 nA FB Voltage Line Regulation 2.5V ≤ VIN ≤ 60V 0.002 0.02 %/V FB Error Amp Transconductance 300 µS FB Error Amp Sink/Source Current ±25 µA Peak Current Limit Sense Voltage 0% Duty Cycle 80 95 110 mV Peak Current Limit Sense Voltage 100% Duty Cycle 60 mV TK/SS Charge Current 9 µA
Current Regulation
Sense Common Mode Range l 0 60 V Average Current Limit Sense Voltage VICTRL = Open l 47.5 50 52.5 mV VICTRL = 800mV 40 mV IMON Voltage VSENSE = 50mV l 0.95 1.00 1.05 V VSENSE = 20mV 0.4 V ICTRL Current VICTRL = 1V 7 µA Reverse Protect Sense Voltage VMODE = 7.5V –50 mV Reverse Current Sense Voltage Offset VMODE = VFB or VMODE = 0V 5 mV Sense Input Current SENSE+ = SENSE– = 12V 300 µA
Oscillator
Switching Frequency RT = 49.9k l 280 300 320 kHz RT = 348k 50 kHz RT = 13.7k 1000 kHz SYNC Threshold 1.2 V 3840fa For more information www.linear.com/LT3840 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Minimum Operating Voltage l 2.5 V VIN Supply Current 20 µA VIN Burst Mode Current VMODE = 0V 20 30 µA VIN Shutdown Current VEN = 0.3V l 0.1 1 µA AUXVIN Minimum Operating Voltage l 2.5 V AUXVIN Overvoltage Lockout l 60 V AUXVIN Supply Current (Note 3) 300 µA AUXVIN Burst Mode Current VMODE = 0V 0.1 µA AUXVIN Shutdown Current VEN = 0.3V 0.1 1 µA EN Enable Threshold (Rising) l 1.20 1.25 1.30 V EN Hysteresis 30 mV EN Pin Bias Current VEN = 1.25V 2 nA UVLO Enable Threshold (Rising) l 1.20 1.25 1.30 V UVLO Hysteresis 45 mV UVLO Pin Bias Current VUVLO = 1.25V 1 nA OVLO Threshold (Rising) l 1.20 1.25 1.30 V OVLO Hysteresis 125 mV OVLO Pin Bias Current VOVLO = 1.25V 1 nA
Voltage Regulation
Regulated FB Voltage E- and I-Grade l 1.237 1.250 1.263 V Regulated FB Voltage MP- and H-Grade l 1.232 1.250 1.263 V FB Overvoltage Protection % Above FB Voltage l 8 12 16 % FB Overvoltage Protection Hysteresis 2.5 % FB Input Bias Current 5 20 nA FB Voltage Line Regulation 2.5V ≤ VIN ≤ 60V 0.002 0.02 %/V FB Error Amp Transconductance 300 µS FB Error Amp Sink/Source Current ±25 µA Peak Current Limit Sense Voltage 0% Duty Cycle 80 95 110 mV Peak Current Limit Sense Voltage 100% Duty Cycle 60 mV TK/SS Charge Current 9 µA
Current Regulation
Sense Common Mode Range l 0 60 V Average Current Limit Sense Voltage VICTRL = Open l 47.5 50 52.5 mV VICTRL = 800mV 40 mV IMON Voltage VSENSE = 50mV l 0.95 1.00 1.05 V VSENSE = 20mV 0.4 V ICTRL Current VICTRL = 1V 7 µA Reverse Protect Sense Voltage VMODE = 7.5V –50 mV Reverse Current Sense Voltage Offset VMODE = VFB or VMODE = 0V 5 mV Sense Input Current SENSE+ = SENSE– = 12V 300 µA
Oscillator
Switching Frequency RT = 49.9k l 280 300 320 kHz RT = 348k 50 kHz RT = 13.7k 1000 kHz SYNC Threshold 1.2 V 3840fa For more information www.linear.com/LT3840 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts