Overview
The TPS62220DDCT is a high-efficiency, synchronous step-down converter from Texas Instruments. It is part of the TPS6222x family, which is designed for applications requiring high efficiency and small form factor. This device operates at a fixed frequency of 1.25 MHz and can achieve efficiencies of up to 95%. The TPS62220DDCT is available in a compact TSOT23 package, making it ideal for space-constrained designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.5 | 6 | V | |
| Output Current | 400 | mA | ||
| Switching Frequency | 0.8 | 1.25 | 1.85 | MHz |
| Operating Quiescent Current | 15 | 25 | µA | |
| Shutdown Quiescent Current | 0.1 | 1 | µA | |
| P-Channel MOSFET On-Resistance (VGS = 3.6V) | 530 | 670 | mΩ | |
| N-Channel MOSFET On-Resistance (VGS = 3.6V) | 430 | 540 | mΩ | |
| Output Voltage Accuracy | -3% | 3% | % | |
| Operating Junction Temperature Range | -40 | 150 | °C |
Key Features
- High efficiency of up to 95% with low quiescent current (typically 15 µA) in power-save mode.
- Fixed 1.25-MHz switching frequency for moderate to heavy load currents and pulse frequency modulation (PFM) at light load currents.
- Soft-start circuit to limit inrush current during start-up.
- 100% duty cycle low-dropout operation.
- Dynamic output-voltage positioning for superior line and load regulation.
- Compact TSOT23 package requiring only three small external components.
- Advanced fast response voltage mode control scheme with input voltage feed forward.
Applications
- PDAs and Pocket PCs.
- Cellular Phones and Smart Phones.
- OMAP™ and Low Power DSP Supplies.
- Digital Cameras.
- Portable Media Players.
- Portable Equipment.
- WLAN PC Cards.
Q & A
- What is the input voltage range of the TPS62220DDCT? The input voltage range is from 2.5 V to 6 V.
- What is the maximum output current of the TPS62220DDCT? The maximum output current is 400 mA.
- What is the typical switching frequency of the TPS62220DDCT? The typical switching frequency is 1.25 MHz.
- How does the TPS62220DDCT manage efficiency at light load currents? At light load currents, the device enters power-save mode, reducing the switching frequency and quiescent current to achieve high efficiency.
- What is the purpose of the soft-start circuit in the TPS62220DDCT? The soft-start circuit limits the inrush current during start-up to prevent voltage drops in the input voltage.
- What package type is the TPS62220DDCT available in? The TPS62220DDCT is available in a TSOT23 package.
- How many external components are required for the TPS62220DDCT? Only three small external components are required.
- What is the operating junction temperature range of the TPS62220DDCT? The operating junction temperature range is from -40°C to 150°C.
- What is the shutdown quiescent current of the TPS62220DDCT? The shutdown quiescent current is typically 0.1 µA.
- What are some common applications of the TPS62220DDCT? Common applications include PDAs, cellular phones, digital cameras, and portable media players.
