Overview
The TPS61085DGKT from Texas Instruments is a high-frequency, high-efficiency DC-DC boost converter. This device is integrated with a 2-A, 0.13-Ω power switch, enabling it to provide output voltages up to 18.5 V. It operates within a current mode scheme with quasi-constant frequency and is externally compensated for maximum flexibility and stability. The converter features a selectable switching frequency of 650 kHz or 1.2 MHz, allowing for the use of small external inductors and capacitors, and providing fast transient response. A dedicated soft-start pin helps in controlling the inrush current at startup, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.3 to 6 | V |
| Output Voltage Range | VIN + 0.5 to 18.5 | V |
| Switch Current Limit | 2.0 A (minimum) | A |
| Switching Frequency | 650 kHz or 1.2 MHz | kHz/MHz |
| Operating Junction Temperature | -40 to 125 | °C |
| Operating Free-Air Temperature | -40 to 105 | °C |
| Package Type | 8-Pin VSSOP, 8-Pin TSSOP | |
| Junction-to-Ambient Thermal Resistance (VSSOP) | 189.3 | °C/W |
| Junction-to-Ambient Thermal Resistance (TSSOP) | 183.3 | °C/W |
Key Features
- Selectable switching frequency of 650 kHz or 1.2 MHz
- Adjustable soft-start to minimize inrush current at startup
- Thermal shutdown and undervoltage lockout for protection
- External compensation for optimizing the regulator for specific application conditions
- High-efficiency operation with a peak switch current limit of 2 A
- Novel topology using adaptive OFF-time for superior load and line transient responses
Applications
- Handheld devices
- GPS receivers
- Digital still cameras
- Portable applications
- DSL modems
- PCMCIA cards
- TFT LCD bias supply
Q & A
- What is the input voltage range of the TPS61085DGKT?
The input voltage range is from 2.3 V to 6 V.
- What are the available switching frequencies for the TPS61085DGKT?
The switching frequencies are 650 kHz and 1.2 MHz.
- What is the maximum output voltage that the TPS61085DGKT can provide?
The maximum output voltage is up to 18.5 V.
- What is the purpose of the soft-start pin in the TPS61085DGKT?
The soft-start pin is used to control the inrush current at startup.
- What are the package options available for the TPS61085DGKT?
The device is available in 8-Pin VSSOP and 8-Pin TSSOP packages.
- What are some of the protection features of the TPS61085DGKT?
The device features thermal shutdown and undervoltage lockout for protection.
- How does the selectable switching frequency benefit the design?
The selectable switching frequency allows for the use of small sized components (1.2 MHz) or higher system efficiency (650 kHz).
- What is the operating junction temperature range of the TPS61085DGKT?
The operating junction temperature range is from -40°C to 125°C.
- What types of applications is the TPS61085DGKT suitable for?
The device is suitable for handheld devices, GPS receivers, digital still cameras, portable applications, DSL modems, PCMCIA cards, and TFT LCD bias supply.
- How does the external compensation feature benefit the regulator?
The external compensation allows optimizing the regulator for specific application conditions, providing maximum flexibility and stability.
