Texas Instruments TPS62224DDCT

Overview

TPS62224DDCT from Texas Instruments is a 400-mA, 1.25-MHz synchronous step-down DC-DC converter in a TSOT23-5 package, delivering a fixed 1.6 V output from 2.5–6 V input. It features power-save mode (PFM), 15 µA quiescent current, and 100% duty-cycle low-dropout operation-designed for powering DSP cores and application processors in battery-powered handheld devices.

For engineers reviewing the TPS62224DDCT datasheet, TPS62224DDCT pinout, TPS62224DDCT application, or TPS62224DDCT equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed thermal and efficiency behavior across load and temperature, and real-world substitution guidance for portable power design.

Technical Context

The TPS62224DDCT employs voltage-mode PWM control with input-voltage feed-forward, enabling fast line/load regulation using only ceramic input/output capacitors. Its internal 0.5-V reference and fixed feedback divider set the 1.6-V output without external resistors.

At light loads, it transitions to pulse-frequency modulation (PFM) with dynamic voltage positioning-maintaining output at +0.8% nominal (1.613 V) to absorb transient drops-while reducing switching frequency and holding quiescent current to 15 µA typical. The device supports 100% duty cycle down to VI = VO + IO × rDS(on)_PCH + IL × R_L, extending battery runtime in Li-ion systems.

Key Specifications

Pinout & Package

TSOT23-5 package (2.9 mm × 1.6 mm × 0.9 mm, 0.95 mm pitch), thermally enhanced with exposed pad (DDC suffix). Pin 1 marked by dot; top-view orientation per TI SLVS491E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62224DDCT, TPS62221DDCT provides tighter alignment to legacy 1.5-V core supplies while TPS62229DDCT supports emerging 1.7-V I/O standards-both retain identical efficiency curves, thermal derating, and PCB footprint, enabling voltage-scaling flexibility without redesign.

Availability

TPS62224DDCT is available at Aetrix Electronics and suitable for smartphone application processor cores, PDA DSP power rails, digital camera image sensor bias, and WLAN PC card baseband applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS62224DDCT 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 decades of expertise in high-efficiency DC-DC conversion for portable electronics.

The TPS6222x product line was engineered specifically for space-constrained, battery-powered systems-delivering high efficiency across wide load ranges while minimizing external component count and PCB area in TSOT23 packaging.

FAQ

What is the output voltage tolerance of the TPS62224DDCT over temperature and load?

The TPS62224DDCT delivers 1.6 V output with ±3% tolerance across –40°C to +85°C ambient temperature and 0–400 mA load current, as verified in TI's SLVS491E datasheet Section 6.5. This specification holds under all recommended operating conditions including 2.5–6 V input and proper external component selection (4.7-µH inductor, 10-µF output capacitor). The device achieves this via internal digital self-calibration that adjusts duty cycle in ~1% steps when output drift exceeds ±1.6%.

Does the TPS62224DDCT require external feedback resistors to set its output voltage?

No, the TPS62224DDCT does not require external feedback resistors. It is a fixed-output variant with an internal resistor divider configured for 1.6 V, directly connecting the FB pin to the internal 0.5-V reference amplifier. This eliminates layout sensitivity, resistor tolerance errors, and board space-unlike the adjustable TPS62220DDCT, which requires external R1/R2 to set V_OUT. The FB pin on TPS62224DDCT must remain unconnected to external components.

How does the TPS62224DDCT behave during light-load conditions?

Below ~66 mA load, the TPS62224DDCT automatically enters power-save mode (PFM), reducing switching frequency and lowering quiescent current to 15 µA typical. In this mode, output voltage is dynamically positioned at +0.8% nominal (1.613 V) to provide headroom for load transients. The device wakes instantly when output falls below the comp-low threshold (~1.587 V) and resumes PWM operation-ensuring seamless transition without output glitches or delay.

Can the TPS62224DDCT operate with a 2.7-V input and still regulate 1.6 V at 400 mA?

Yes-the TPS62224DDCT supports 100% duty-cycle operation, enabling regulation down to VI = VO + IO × rDS(on)_PCH + IL × R_L. At 400 mA and 25°C, with typical rDS(on)_PCH = 670 mΩ and a 4.7-µH inductor (R_L ≈ 80 mΩ), minimum input is ~2.65 V. Thus, 2.7 V input fully sustains 1.6 V/400 mA output-critical for maximizing runtime from discharged Li-ion cells.

What is the maximum allowable PCB temperature rise for continuous 400-mA operation of the TPS62224DDCT?

Under continuous 400-mA load at TA = 85°C, the TPS62224DDCT's junction temperature must stay ≤125°C (recommended max). With θ_JA = 250°C/W for TSOT23-5 and 400 mW dissipation (at ~85% efficiency), ΔT_JA ≈ 100°C-requiring PCB copper area ≥125 mm² under the exposed pad and ambient ≤75°C for safe operation. Derating to 220 mW (TA = 70°C) or 160 mW (TA = 85°C) per TI's dissipation table ensures reliability without forced airflow.