Datasheet LT1681 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Dual Transistor Synchronous Forward Controller |
| Pages / Page | 20 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 281 Kb |
| Document Language | English |
ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LT1681
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
Supply Voltages ORDER PART Power Supply (V NUMBER CC) ... – 0.3V to 20V TOP VIEW Topside Supply (VBST)... VBSTREF – 0.3V to SHDN 1 20 VBST LT1681ESW VBSTREF + 20V (VBST(MAX) = 90V) OVLO 2 19 TG LT1681ISW Topside Reference Pin (VBSTREF).. – 0.6V to 75V THERM 3 18 BSTREF Input Voltages SGND 4 17 BLKSENS SHDN Pin .. – 0.3V to VCC + 0.3V 5V 5 16 REF BG All Other Inputs ... – 0.3V to 5V FSET 6 15 PWRGND REF + 0.3V Maximum Currents SYNC 7 14 VCC 5V SS 8 13 SG REF Pin .. – 85mA to 10mA FSET Pin ... – 2mA to 5mA V 9 12 FB IMAX V 10 11 SENSE All Other Inputs .. – 2mA to 2mA C Operating Ambient Temperature Range SW PACKAGE 20-LEAD PLASTIC SO LT1681E (Note 4) .. – 40°C to 85°C TJMAX = 125°C, θJA = 85°C/ W LT1681I ... – 40°C to 85°C Storage Temperature Range .. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply and Protection
VCC Operating Supply Voltage Range ● 9 12 18 V ICC DC Active Supply Current (Note 2) 17 22 mA ● 25 mA DC Active UVL Supply Current VSHDN > 1.35V, VCC = 8V ● 800 1200 µA DC Standby Supply Current VSHDN < 0.3V 0.5 µA IBST DC Active Supply Current TG Logic High (Note 2) ● 5 8.5 mA DC Standby Supply Current VSHDN < 0.3V 0.1 µA VSHDN Shutdown Rising Threshold ● 1.15 1.25 1.35 V Shutdown Threshold Hysteresis ● 100 150 200 mV ISS Soft-Start Charge Current VSS = 2V ● –14 – 10 – 6 µA VSS Soft-Start Reset Threshold 225 mV VCCUVLO Undervoltage Lockout Threshold Falling Edge ● 8.0 8.40 8.60 V Rising Edge ● 8.3 8.75 8.95 V Undervoltage Lockout Hysteresis ● 0.25 0.35 V VBSTUVLO Boost Undervoltage Lockout Falling Edge ● 5.7 6.4 7.1 V (VBST-BSTREF) Rising Edge ● 6.5 7.0 7.5 V Boost UVLO Hysteresis ● 0.3 0.6 V 1681f 2
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
Supply Voltages ORDER PART Power Supply (V NUMBER CC) ... – 0.3V to 20V TOP VIEW Topside Supply (VBST)... VBSTREF – 0.3V to SHDN 1 20 VBST LT1681ESW VBSTREF + 20V (VBST(MAX) = 90V) OVLO 2 19 TG LT1681ISW Topside Reference Pin (VBSTREF).. – 0.6V to 75V THERM 3 18 BSTREF Input Voltages SGND 4 17 BLKSENS SHDN Pin .. – 0.3V to VCC + 0.3V 5V 5 16 REF BG All Other Inputs ... – 0.3V to 5V FSET 6 15 PWRGND REF + 0.3V Maximum Currents SYNC 7 14 VCC 5V SS 8 13 SG REF Pin .. – 85mA to 10mA FSET Pin ... – 2mA to 5mA V 9 12 FB IMAX V 10 11 SENSE All Other Inputs .. – 2mA to 2mA C Operating Ambient Temperature Range SW PACKAGE 20-LEAD PLASTIC SO LT1681E (Note 4) .. – 40°C to 85°C TJMAX = 125°C, θJA = 85°C/ W LT1681I ... – 40°C to 85°C Storage Temperature Range .. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply and Protection
VCC Operating Supply Voltage Range ● 9 12 18 V ICC DC Active Supply Current (Note 2) 17 22 mA ● 25 mA DC Active UVL Supply Current VSHDN > 1.35V, VCC = 8V ● 800 1200 µA DC Standby Supply Current VSHDN < 0.3V 0.5 µA IBST DC Active Supply Current TG Logic High (Note 2) ● 5 8.5 mA DC Standby Supply Current VSHDN < 0.3V 0.1 µA VSHDN Shutdown Rising Threshold ● 1.15 1.25 1.35 V Shutdown Threshold Hysteresis ● 100 150 200 mV ISS Soft-Start Charge Current VSS = 2V ● –14 – 10 – 6 µA VSS Soft-Start Reset Threshold 225 mV VCCUVLO Undervoltage Lockout Threshold Falling Edge ● 8.0 8.40 8.60 V Rising Edge ● 8.3 8.75 8.95 V Undervoltage Lockout Hysteresis ● 0.25 0.35 V VBSTUVLO Boost Undervoltage Lockout Falling Edge ● 5.7 6.4 7.1 V (VBST-BSTREF) Rising Edge ● 6.5 7.0 7.5 V Boost UVLO Hysteresis ● 0.3 0.6 V 1681f 2
