Texas Instruments TPS62222DDCR

Overview

TPS62222DDCR from Texas Instruments is a synchronous step-down DC-DC converter in TSOT23-5 package, delivering 1.8 V at up to 400 mA output current from a 2.5–6 V input. It operates at 1.25 MHz fixed-frequency PWM under medium-to-heavy load and switches to power-save mode (PFM) at light loads, achieving up to 95% efficiency and 15 µA quiescent current. It powers low-voltage DSPs and processors in portable media players.

For engineers reviewing the TPS62222DDCR datasheet, TPS62222DDCR pinout, TPS62222DDCR application, or TPS62222DDCR equivalent, key selection criteria include its 1.8 V fixed output, 400-mA capability, TSOT23-5 footprint, soft-start functionality, and dynamic voltage positioning for transient response in battery-powered systems.

Technical Context

The TPS62222DDCR uses voltage-mode control with input voltage feed-forward for fast line/load regulation and stable operation with small ceramic capacitors. Its internal digital self-calibration adjusts duty cycle in ~1% steps to maintain ±3% output accuracy across line and load variations.

It supports 100% duty-cycle low-dropout operation to extend battery life and enters power-save mode when peak switch current falls below ~66 mA, reducing switching frequency and quiescent current to ~15 µA while maintaining regulation via comparator thresholds set at +0.8% and +1.6% above nominal output.

Key Specifications

Pinout & Package

TSOT23-5 package: 2.9 mm × 1.6 mm × 0.9 mm, thermally enhanced, lead-free, RoHS-compliant surface-mount package with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS62221DDCR and TPS62229DDCR, the TPS62222DDCR provides the exact 1.8 V output required for OMAP™ and TMS320™ DSP core rails, eliminating need for external level-shifting or margining-making it the optimal choice for designs targeting TI's 1.8 V ecosystem.

Availability

TPS62222DDCR is available at Aetrix Electronics and suitable for smartphone application processor core supply, digital camera image sensor bias rail, and portable media player audio codec power requiring stable component supply across production lifecycles.

Supply support for TPS62222DDCR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in energy-efficient power conversion.

The TPS6222x product line was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-quiescent-current DC-DC conversion in ultra-small packages.

FAQ

What is the output voltage tolerance of the TPS62222DDCR over temperature and load?

The TPS62222DDCR maintains a fixed 1.8 V output with ±3% tolerance across the full operating ambient temperature range (−40°C to +85°C) and full load range (0–400 mA). This specification is guaranteed by internal digital self-calibration that adjusts duty cycle in discrete ~1% steps whenever output deviates more than ±1.6% from nominal, ensuring consistent regulation without external trimming components. The TPS62222DDCR achieves this accuracy using a 500 mV internal reference and precision feedback amplifier.

Does the TPS62222DDCR require external compensation components?

No, the TPS62222DDCR features fully internal loop compensation optimized for standard output filters (e.g., 4.7 µH inductor + 10 µF ceramic capacitor). Unlike adjustable-output buck converters, it does not require external RC networks on the FB pin because the feedback divider is internal and fixed for the 1.8 V version. This eliminates design complexity, reduces BOM cost, and improves layout robustness-making the TPS62222DDCR ideal for rapid prototyping and high-volume portable designs where space and reliability are critical.

How does the TPS62222DDCR manage efficiency at light loads?

The TPS62222DDCR automatically transitions from fixed-frequency PWM mode to power-save mode (PFM) when load current drops below approximately 66 mA. In PFM mode, switching frequency decreases dynamically, and quiescent current drops to 15 µA typical-enabling >85% efficiency even at 1 mA load. This behavior is controlled by internal comparators monitoring output voltage deviation (±0.8%/±1.6%) and peak switch current, allowing the TPS62222DDCR to sustain high efficiency across the entire 0–400 mA range without manual mode selection.

Can the TPS62222DDCR operate with a 2.5 V input while delivering 1.8 V at 400 mA?

Yes, the TPS62222DDCR supports 100% duty-cycle operation, enabling regulation at minimum input voltage. At 2.5 V input and 400 mA load, the device remains in regulation as long as the sum of output voltage (1.8 V), dropout losses (IO × rDS(on)_Pch ≈ 0.4 A × 0.67 Ω = 268 mV), and inductor DCR drop stays within the input margin. With typical P-channel rDS(on) of 670 mΩ at 2.5 V and a low-DCR inductor (<50 mΩ), the TPS62222DDCR sustains 1.8 V output down to ~2.45 V input-maximizing usable capacity from single-cell Li-ion batteries.

What is the recommended PCB layout practice for the SW pin of the TPS62222DDCR?

The SW pin (Pin 5) of the TPS62222DDCR must be routed with minimal trace length and width to reduce parasitic inductance, as it switches between 0 V and VI at 1.25 MHz with high di/dt. Place the inductor directly adjacent to the SW pad, use a solid ground plane beneath the switch node, and avoid vias or sharp bends. Thermal relief should be omitted on the SW pad to ensure low-inductance connection. These practices prevent ringing, EMI emission, and potential instability-critical for achieving the TPS62222DDCR's rated 95% efficiency and clean transient response.