Datasheet LT8645S, LT8646S (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current |
| Pages / Page | 30 / 3 — ORDER INFORMATION. MSL. PART NUMBER. PART MARKING*. FINISH CODE. PAD … |
| Revision | B |
| File Format / Size | PDF / 2.4 Mb |
| Document Language | English |
ORDER INFORMATION. MSL. PART NUMBER. PART MARKING*. FINISH CODE. PAD FINISH. PACKAGE TYPE***. RATING. TEMPERATURE RANGE
Model Line for this Datasheet
Text Version of Document
LT8645S/LT8646S
ORDER INFORMATION MSL PART NUMBER PART MARKING* FINISH CODE PAD FINISH PACKAGE TYPE*** RATING TEMPERATURE RANGE
LT8645SEV#PBF 8645SV LT8645SIV#PBF e4 Au (RoHS) LQFN (Laminate Package LT8646SEV#PBF with QFN Footprint) 3 –40°C to 125°C 8646SV LT8646SIV#PBF
AUTOMOTIVE PRODUCTS**
LT8645SEV#WPBF 8645SV LT8645SIV#WPBF e4 Au (RoHS) LQFN (Laminate Package LT8646SEV#WPBF with QFN Footprint) 3 –40°C to 125°C 8646SV LT8646SIV#WPBF • Contact the factory for parts specified with wider operating temperature • Recommended LGA and BGA PCB Assembly and Manufacturing ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609. Procedures • LGA and BGA Package and Tray Drawings Parts ending with PBF are RoHS and WEEE compliant. ***The LT8645S/LT8646S package has the same footprint as a standard 6mm × 4mm QFN Package.
**
Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models.
ELECTRICAL 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
Minimum Input Voltage l 3.0 3.4 V VIN Quiescent Current in Shutdown VEN/UV = 0V 0.9 3 µA l 0.9 10 µA LT8645S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA (Internal Compensation) l 1.7 10 µA LT8646S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V 230 290 µA (External Compensation) l 230 340 µA VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 16 25 µA LT8646S BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 200 260 µA LT8645S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V 0.4 0.6 mA LT8646S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V 0.6 0.8 mA LT8645S VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0V l 17 60 µA VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0V l 200 400 µA Feedback Reference Voltage VIN = 6V 0.964 0.970 0.976 V VIN = 6V l 0.958 0.970 0.982 V Feedback Voltage Line Regulation VIN = 4.0V to 42V l 0.004 0.025 %/V Feedback Pin Input Current VFB = 1V –20 20 nA LT8646S Error Amp Transconductance VC = 1.25V 1.7 mS LT8646S Error Amp Gain 350 V/V LT8646S VC Source Current VFB = 0.77V, VC = 1.25V 350 µA LT8646S VC Sink Current VFB = 1.17V, VC = 1.25V 350 µA Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
ORDER INFORMATION MSL PART NUMBER PART MARKING* FINISH CODE PAD FINISH PACKAGE TYPE*** RATING TEMPERATURE RANGE
LT8645SEV#PBF 8645SV LT8645SIV#PBF e4 Au (RoHS) LQFN (Laminate Package LT8646SEV#PBF with QFN Footprint) 3 –40°C to 125°C 8646SV LT8646SIV#PBF
AUTOMOTIVE PRODUCTS**
LT8645SEV#WPBF 8645SV LT8645SIV#WPBF e4 Au (RoHS) LQFN (Laminate Package LT8646SEV#WPBF with QFN Footprint) 3 –40°C to 125°C 8646SV LT8646SIV#WPBF • Contact the factory for parts specified with wider operating temperature • Recommended LGA and BGA PCB Assembly and Manufacturing ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609. Procedures • LGA and BGA Package and Tray Drawings Parts ending with PBF are RoHS and WEEE compliant. ***The LT8645S/LT8646S package has the same footprint as a standard 6mm × 4mm QFN Package.
**
Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models.
ELECTRICAL 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
Minimum Input Voltage l 3.0 3.4 V VIN Quiescent Current in Shutdown VEN/UV = 0V 0.9 3 µA l 0.9 10 µA LT8645S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA (Internal Compensation) l 1.7 10 µA LT8646S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V 230 290 µA (External Compensation) l 230 340 µA VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 16 25 µA LT8646S BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 200 260 µA LT8645S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V 0.4 0.6 mA LT8646S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V 0.6 0.8 mA LT8645S VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0V l 17 60 µA VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0V l 200 400 µA Feedback Reference Voltage VIN = 6V 0.964 0.970 0.976 V VIN = 6V l 0.958 0.970 0.982 V Feedback Voltage Line Regulation VIN = 4.0V to 42V l 0.004 0.025 %/V Feedback Pin Input Current VFB = 1V –20 20 nA LT8646S Error Amp Transconductance VC = 1.25V 1.7 mS LT8646S Error Amp Gain 350 V/V LT8646S VC Source Current VFB = 0.77V, VC = 1.25V 350 µA LT8646S VC Sink Current VFB = 1.17V, VC = 1.25V 350 µA Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
