Overview
The TPS61040, produced by Texas Instruments, is a high-frequency boost converter designed for small to medium LCD bias supply and white LED backlight applications. This device is ideal for generating output voltages up to 28 V from a dual-cell NiMH/NiCd or a single-cell Li-Ion battery. It also supports standard 3.3-V or 5-V to 12-V power conversions. The TPS61040 operates with a switching frequency up to 1 MHz, enabling the use of very small external components, including ceramic and tantalum output capacitors. This feature, combined with its compact package options (SOT23-5, TSOT23-5, and 2-mm × 2-mm × 0.8-mm WSON), makes it an excellent choice for space-constrained designs.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Input Voltage Range | 1.8 V to 6 V | |
| Adjustable Output Voltage Range | Up to 28 V | |
| Internal Switch Current | 400 mA (TPS61040), 250 mA (TPS61041) | |
| Switching Frequency | Up to 1 MHz | |
| No-Load Quiescent Current | 28 μA (typical) | |
| Shutdown Current | 1 μA (typical) | |
| Package Options | SOT23-5, TSOT23-5, 2-mm × 2-mm × 0.8-mm WSON | |
| Operating Temperature Range | -40°C to 125°C | |
| Line Regulation | 0.05 %/V (1.8 V ≤ VIN ≤ 6 V; VOUT = 18 V; Iload = 10 mA) | Depends on external component selection |
| Load Regulation | 0.15 %/mA (VIN = 2.4 V; VOUT = 18 V; 0 mA ≤ IOUT ≤ 30 mA) | Depends on external component selection |
Key Features
- High-frequency boost converter with up to 1 MHz switching frequency
- Adjustable output voltage range up to 28 V
- Internal switch current limit: 400 mA (TPS61040) and 250 mA (TPS61041)
- Low no-load quiescent current: 28 μA (typical)
- Low shutdown current: 1 μA (typical)
- Internal soft start to limit inrush current
- Compact package options: SOT23-5, TSOT23-5, and 2-mm × 2-mm × 0.8-mm WSON
- High efficiency over the entire load current range using pulse-frequency-modulation (PFM) scheme with constant peak current control
Applications
- LCD bias supply
- White LED backlight supplies for LCDs
- Digital still cameras
- PDAs, organizers, and handheld PCs
- Cellular phones
- Internet audio players
- Standard 3.3-V or 5-V to 12-V power conversions
Q & A
- What is the input voltage range of the TPS61040? The input voltage range is from 1.8 V to 6 V.
- What is the maximum output voltage that the TPS61040 can generate? The TPS61040 can generate output voltages up to 28 V.
- What are the internal switch current limits for the TPS61040 and TPS61041? The TPS61040 has an internal switch current limit of 400 mA, while the TPS61041 has a limit of 250 mA.
- What is the switching frequency of the TPS61040? The switching frequency is up to 1 MHz.
- What is the typical no-load quiescent current of the TPS61040? The typical no-load quiescent current is 28 μA.
- What is the typical shutdown current of the TPS61040? The typical shutdown current is 1 μA.
- What package options are available for the TPS61040? The TPS61040 is available in SOT23-5, TSOT23-5, and 2-mm × 2-mm × 0.8-mm WSON packages.
- What is the operating temperature range of the TPS61040? The operating temperature range is from -40°C to 125°C.
- How does the TPS61040 manage inrush current during startup? The TPS61040 uses an internal soft start to limit inrush current by increasing the current limit in two steps.
- What control scheme does the TPS61040 use to maintain high efficiency? The TPS61040 uses a pulse-frequency-modulation (PFM) scheme with constant peak current control to maintain high efficiency over the entire load current range.
