Features and Benefits
- Wide Input Range: 4.5V to 55V VIN/VAUX
- Reverse Input Protection to –55V
- Split Input Supplies for High Efficiency Boost Ratios
- IOUT Up to 50mA
- 15µA VIN Quiescent Current
- 1µA VAUX Quiescent Current
- Stable with Ceramic Capacitors
- Short-Circuit/Thermal Protection
- Thermally Enhanced 10-Pin MSOP Package
The LTC3290 is a high voltage boost charge pump with a wide 4.5V to 55V input voltage range that can deliver up to 50mA of output current.
When the VSET pin is grounded, the LTC3290 operates as a standard boost charge pump, boosting the VOUT output to a maximum of the sum of the VIN and VAUX input supplies. An external resistor divider can be used on the VOUT, FB and GND pins to set the output voltage to any value between 1V and VIN + VAUX with hysteretic Burst Mode operation.
Alternatively, the device can be configured in a VIN tracking mode, in which the VOUT pin regulates at a fixed offset above the VIN pin. The offset voltage is programmed with external resistors, one from the VOUT to the VSET pin and the other from the FB pin to GND. The maximum output voltage is limited to VIN + VAUX.
The LTC3290 is available in a thermally enhanced 10-pin MSOP package.
- High Efficiency General Purpose High Voltage Boost Supplies
- High Side N-FET Driver
- Industrial/Automotive Power Switching
- VIN Tracking Supply
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 2585A contains two circuits featuring the LTC3290. The top LTC3290 circuit operates as a high voltage boost by using the power from two input supplies to create a higher output voltage. The bottom LTC3290 circuit operates as a VIN tracking supply by using the power from an auxiliary supply input (VAUX) and regulating a voltage above the VIN supply input. The wide VIN/VAUX range allows two voltages to be used together to efficiently create a third voltage, boost from a single supply to boost, or regulate above a variable input voltage like a battery.
The high efficiency boost circuit has three selectable outputs, 15V, 24V, or 42V. If a different output is desired then the top resistor, R2, and/or the bottom resistor, R6, can be changed to provide a different output voltage. Refer to the LTC3290 data sheet and demo board schematic for more information on how to set the output voltage for the LTC3290.
The VIN tracking circuit also has three selectable outputs, VIN2 + 5V, VIN2 + 10V, and VIN2 + 15V. If a different output voltage is desired, then R9 and/or R13 can be changed to set a different output. Refer to the LTC3290 data sheet for more information on how to set the output voltage in VIN tracking mode.
The LTC3290 can use two separate supplies or a single supply connected to both inputs for either circuit. This can be useful to boost or track a battery voltage with a regulated output.
The LTC3290 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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