| Part Number | LT3957EUHE#TRPBF | LT3958EUHE#TRPBF | 
|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | 
| Category | PMIC - Voltage Regulators - DC DC Switching Regulators | PMIC - Voltage Regulators - DC DC Switching Regulators | 
|   |   | |
| Product Status | Active | Active | 
| Function | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | 
| Output Configuration | Positive or Negative | Positive or Negative | 
| Topology | Boost, Cuk, Flyback, SEPIC | Boost, Cuk, Flyback, SEPIC | 
| Output Type | Adjustable | Adjustable | 
| Number of Outputs | 1 | 1 | 
| Voltage - Input (Min) | 3V | 5V | 
| Voltage - Input (Max) | 40V | 80V | 
| Voltage - Output (Min/Fixed) | 1.6V | 1.6V | 
| Voltage - Output (Max) | 40V (Switch) | 84V (Switch) | 
| Current - Output | 5A (Switch) | 3.3A (Switch) | 
| Frequency - Switching | 100kHz ~ 1MHz | 100kHz ~ 1MHz | 
| Synchronous Rectifier | No | No | 
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 36-WFQFN, 28 Leads, Exposed Pad | 36-WFQFN, 28 Leads, Exposed Pad | 
| Supplier Device Package | 36-QFN (5x6) | 36-QFN (5x6) |