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| Part Number | LTC3859ALIFE | LTC3859AIFE | LTC3859ALEFE | LTC3859ALHFE | 
|---|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | 
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | 
| Function | Step-Down, Step-Up/Step-Down | Step-Down, Step-Up/Step-Down | Step-Down, Step-Up/Step-Down | Step-Down, Step-Up/Step-Down | 
| Output Configuration | Positive | Positive | Positive | Positive | 
| Topology | Buck, Buck-Boost, SEPIC | Buck, Buck-Boost, SEPIC | Buck, Buck-Boost, SEPIC | Buck, Buck-Boost, SEPIC | 
| Number of Outputs | 3 | 3 | 3 | 3 | 
| Output Phases | 2 | 2 | 2 | 2 | 
| Voltage - Supply (Vcc/Vdd) | 4.5V ~ 38V | 4.5V ~ 38V | 4.5V ~ 38V | 4.5V ~ 38V | 
| Frequency - Switching | 115kHz ~ 835kHz, 350kHz ~ 535kHz | 115kHz ~ 835kHz, 350kHz ~ 535kHz | 115kHz ~ 835kHz, 350kHz ~ 535kHz | 115kHz ~ 835kHz, 350kHz ~ 535kHz | 
| Duty Cycle (Max) | 99%, 100% | 99%, 100% | 99%, 100% | 99%, 100% | 
| Synchronous Rectifier | Yes | Yes | Yes | Yes | 
| Clock Sync | No | No | No | No | 
| Serial Interfaces | - | - | - | - | 
| Control Features | Enable, Frequency Control, Power Good, Soft Start, Tracking | Enable, Frequency Control, Power Good, Soft Start, Tracking | Enable, Frequency Control, Power Good, Soft Start, Tracking | Enable, Frequency Control, Power Good, Soft Start, Tracking | 
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 150°C (TJ) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 38-TFSOP (0.173", 4.40mm Width) Exposed Pad | 38-TFSOP (0.173", 4.40mm Width) Exposed Pad | 38-TFSOP (0.173", 4.40mm Width) Exposed Pad | 38-TFSOP (0.173", 4.40mm Width) Exposed Pad | 
| Supplier Device Package | 38-TSSOP-EP | 38-TSSOP-EP | 38-TSSOP-EP | 38-TSSOP-EP |