Overview
The TPS61087, produced by Texas Instruments, is a high-frequency, high-efficiency DC-DC converter designed for boosting input voltages up to 18.5 V. This device features an integrated 3.2-A, 0.13-Ω power switch, making it suitable for a variety of portable and power-sensitive applications. The converter operates at selectable switching frequencies of 650 kHz or 1.2 MHz, allowing the use of small external inductors and capacitors and providing fast transient response. It also includes adjustable soft-start, thermal shutdown, and undervoltage lockout to ensure reliable operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.5 | 6.0 | V | |
| Output Voltage | 18.5 | V | ||
| Switch Peak Current Limit | 2.0 | 4.8 | A | |
| Switching Frequency | 650 kHz | 1.2 MHz | ||
| Operating Quiescent Current | 75 | 100 | μA | |
| Shutdown Current | 1 | μA | ||
| Undervoltage Lockout Threshold (VIN falling) | 2.4 | V | ||
| Undervoltage Lockout Threshold (VIN rising) | 2.5 | V | ||
| Thermal Shutdown Temperature | 150 | °C | ||
| Thermal Shutdown Hysteresis | 14 | °C |
Key Features
- High-frequency operation: 650 kHz or 1.2 MHz selectable switching frequency
- High-efficiency DC-DC conversion with integrated 3.2-A, 0.13-Ω power switch
- Adjustable soft-start to prevent high inrush current during start-up
- Thermal shutdown and undervoltage lockout for enhanced reliability
- External compensation for optimizing application-specific conditions
- Available in 10-pin QFN and Thin QFN packages
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 TPS61087?
The input voltage range is from 2.5 V to 6.0 V.
- What are the selectable switching frequencies of the TPS61087?
The device can operate at either 650 kHz or 1.2 MHz.
- What is the maximum output voltage the TPS61087 can provide?
The TPS61087 can provide an output voltage up to 18.5 V.
- How does the soft-start feature work in the TPS61087?
The soft-start feature prevents high inrush current during start-up by using an external capacitor connected to the soft-start pin, which slowly ramps up the internal current limit of the boost converter.
- What are the package options for the TPS61087?
The device is available in 10-pin QFN and Thin QFN packages.
- What is the purpose of the thermal shutdown feature in the TPS61087?
The thermal shutdown feature protects the device from overheating by shutting down the converter if the junction temperature exceeds 150°C.
- How is the output voltage set in the TPS61087?
The output voltage is set using an external resistor divider connected to the feedback pin.
- What type of inductors are recommended for use with the TPS61087?
Inductors with a saturation current higher than the peak switch current and low DC resistance are recommended. For 1.2 MHz, inductors between 3 μH and 6 μH are suggested, typically 3.3 μH.
- What is the purpose of the compensation pin in the TPS61087?
The compensation pin allows for external compensation to optimize the regulator loop for specific application conditions.
- What are some common applications of the TPS61087?
Common applications include handheld devices, GPS receivers, digital still cameras, portable applications, DSL modems, PCMCIA cards, and TFT LCD bias supply.
