LTC3805-5 Series
Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller
Manufacturer: Analog Devices
Catalog
Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller
| Part | Output Phases | Function | Mounting Type | Duty Cycle (Max) | Topology | Package / Case | Package / Case | Clock Sync | Output Configuration | Number of Outputs | Control Features | Operating Temperature [Min] | Operating Temperature [Max] | Supplier Device Package | Voltage - Supply (Vcc/Vdd) [Max] | Voltage - Supply (Vcc/Vdd) [Min] | Frequency - Switching [Min] | Frequency - Switching [Max] | Synchronous Rectifier | Output Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -55 °C | 150 °C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 125 ¯C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up Step-Up/Step-Down | Surface Mount | 80 % | Boost Flyback SEPIC | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up Step-Up/Step-Down | Surface Mount | 80 % | Boost Flyback SEPIC | 10-WFDFN Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 125 ¯C | 10-DFN (3x3) | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | |||
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up Step-Up/Step-Down | Surface Mount | 80 % | Boost Flyback SEPIC | 10-WFDFN Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-DFN (3x3) | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | |||
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 10-WFDFN Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-DFN (3x3) | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | |||
Analog Devices | 1 | Step-Up/Step-Down | Surface Mount | 80 % | Flyback | 0.118 in 3 Lead | 10-MSOP 10-TFSOP Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 150 °C | 10-MSOP-EP | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver | ||
Analog Devices | 1 | Step-Up Step-Up/Step-Down | Surface Mount | 80 % | Boost Flyback SEPIC | 10-WFDFN Exposed Pad | Isolation Capable Positive | 1 | Enable Soft Start | -40 °C | 85 °C | 10-DFN (3x3) | 9.5 V | 3.95 V | 70 kHz | 700 kHz | Transistor Driver |
Key Features
• VINand VOUTLimited Only by External Components
• 4.5V Undervoltage Lockout Threshold
• Adjustable Slope Compensation
• Adjustable Overcurrent Protection with Automatic Restart
• Adjustable Operating Frequency (70kHz to 700kHz) With One External Resistor
• Synchronizable to an External Clock
• ±1.5% Reference Accuracy
• Only 100mV Current Sense Voltage Drop
• RUN Pin with Precision Threshold and Adjustable Hysteresis
• Programmable Soft-Start with One External Capacitor
• Low Quiescent Current: 360μA
• Small 10-Lead MSOP and 3mm × 3mm DFN
Description
AI
The LTC3805-5 is a current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.The LTC3805-5 provides ±1.5% output voltage accuracy and consumes only 360μA of quiescent current during normal operation and only 40μA during micropower startup. Using a 9.5V internal shunt regulator, the LTC3805-5 can be powered from a high VINthrough a resistor or it can be powered directly from a low impedance DC voltage from 4.7V to 8.8V.The LTC3805-5 is available in the 10-lead MSOP package and the 3mm × 3mm DFN package.Turn On VoltageLTC38058.4VLTC3805-54.5VApplicationsAutomotive Power SuppliesTelecom Power SuppliesIsolated Electronic EquipmentAuxiliary/Housekeeping Power SuppliesPower over Ethernet