Datasheet LT3781 (Analog Devices) - 2
| Hersteller | Analog Devices |
| Beschreibung | Bootstrap Start Dual Transistor Synchronous Forward Controller |
| Seiten / Seite | 20 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| Dateiformat / Größe | PDF / 260 Kb |
| Dokumentensprache | Englisch |
ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS The
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LT3781
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Power Supply (V ORDER PART CC) TOP VIEW Low Impedance Source Voltage ... –0.3V to 20V NUMBER SHDN 1 20 VBST Shutdown Mode: OVLO 2 19 TG (Supply Self-Regulates to 18V) LT3781EG THERM 3 18 BSTREF Maximum Input Current ... 20mA LT3781IG SGND 4 17 NC Topside Supply (VBST) .. 5V 5 16 REF NC VBSTREF – 0.3V to VBSTREF +20V (VBST(MAX) = 90V) FSET 6 15 BG Topside Reference Pin (VBSTREF) ... –0.6V to 75V SYNC 7 14 PWRGND SHDN Pin Voltage ... –0.3V to VCC + 0.3V SS 8 13 VCC All Other Input Voltages .. –0.3V to 5VREF + 0.3V V 9 12 FB SG 5VREF Pin Sink Current ... 10mA V 10 11 C SENSE FSET Pin Current .. –2mA to 5mA G PACKAGE All Other Input Pin Currents .. –2mA to 2mA 20-LEAD PLASTIC SSOP Operating Ambient TJMAX = 125°C, θJA = 90°C/W Temperature Range (Note 4) ...–40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Operating Junction Temperature Range ...–40°C to 125°C Storage Temperature Range ..–65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C
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
VCCUVLO Undervoltage Lockout Threshold Falling Edge ● 8.0 8.4 8.6 V Rising Edge ● 13 14.5 16 V VCCSHDN Shutdown Mode Shunt Regulator 100µA < IVCC ≤ 10mA ● 16.5 18 19.9 V ICC DC Active Supply Current (Note 2) 17 22 mA ● 25 mA DC Active UVLO Supply Current VSHDN = 1.35V, VCC = 8V ● 800 1200 µA DC Standby Supply Current VSHDN < 0.3V ● 16 30 µA VBST DC Active Supply Current TG Logic High (Note 2) ● 5.0 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 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
5V External Reference
V5VREF 5V Reference Voltage 0 ≤ (I5VREF – IVC) < 20mA 4.85 5.0 5.10 V ● 4.80 5.15 V I5VREFSC Short-Circuit Current Source, IVC = 0 ● 20 45 mA R5VREF Output Impedance 0 ≤ (I5VREF – IVC) < 20mA 1 Ω 3781f 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Power Supply (V ORDER PART CC) TOP VIEW Low Impedance Source Voltage ... –0.3V to 20V NUMBER SHDN 1 20 VBST Shutdown Mode: OVLO 2 19 TG (Supply Self-Regulates to 18V) LT3781EG THERM 3 18 BSTREF Maximum Input Current ... 20mA LT3781IG SGND 4 17 NC Topside Supply (VBST) .. 5V 5 16 REF NC VBSTREF – 0.3V to VBSTREF +20V (VBST(MAX) = 90V) FSET 6 15 BG Topside Reference Pin (VBSTREF) ... –0.6V to 75V SYNC 7 14 PWRGND SHDN Pin Voltage ... –0.3V to VCC + 0.3V SS 8 13 VCC All Other Input Voltages .. –0.3V to 5VREF + 0.3V V 9 12 FB SG 5VREF Pin Sink Current ... 10mA V 10 11 C SENSE FSET Pin Current .. –2mA to 5mA G PACKAGE All Other Input Pin Currents .. –2mA to 2mA 20-LEAD PLASTIC SSOP Operating Ambient TJMAX = 125°C, θJA = 90°C/W Temperature Range (Note 4) ...–40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Operating Junction Temperature Range ...–40°C to 125°C Storage Temperature Range ..–65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C
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
VCCUVLO Undervoltage Lockout Threshold Falling Edge ● 8.0 8.4 8.6 V Rising Edge ● 13 14.5 16 V VCCSHDN Shutdown Mode Shunt Regulator 100µA < IVCC ≤ 10mA ● 16.5 18 19.9 V ICC DC Active Supply Current (Note 2) 17 22 mA ● 25 mA DC Active UVLO Supply Current VSHDN = 1.35V, VCC = 8V ● 800 1200 µA DC Standby Supply Current VSHDN < 0.3V ● 16 30 µA VBST DC Active Supply Current TG Logic High (Note 2) ● 5.0 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 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
5V External Reference
V5VREF 5V Reference Voltage 0 ≤ (I5VREF – IVC) < 20mA 4.85 5.0 5.10 V ● 4.80 5.15 V I5VREFSC Short-Circuit Current Source, IVC = 0 ● 20 45 mA R5VREF Output Impedance 0 ≤ (I5VREF – IVC) < 20mA 1 Ω 3781f 2