Texas Instruments TPS62220DDCR

Overview

TPS62220DDCR from Texas Instruments is an adjustable-output, synchronous step-down DC-DC converter in a 5-pin TSOT23 package, delivering up to 400 mA at output voltages from 0.7 V to VI, operating from 2.5 V to 6 V input, with 1.25 MHz fixed-frequency PWM and power-save mode, used for powering low-voltage DSPs and processors in portable electronics.

For engineers reviewing the TPS62220DDCR datasheet, TPS62220DDCR pinout, TPS62220DDCR application, or TPS62220DDCR equivalent, key selection criteria include its 15 µA typical quiescent current in power-save mode, 0.5 V internal reference voltage, 100% duty-cycle low-dropout operation, and compatibility with small ceramic capacitors (e.g., 4.7 µF input, 10–22 µF output) and 4.7 µH inductors.

Technical Context

The TPS62220DDCR implements a voltage-mode control architecture with input voltage feed-forward, enabling fast line and load transient response using only small ceramic input/output capacitors. Its dual-mode operation switches between 1.25 MHz PWM at medium-to-heavy loads and pulse-frequency modulation (PFM) at light loads to sustain high efficiency across the full 0–400 mA range.

It integrates P-channel and N-channel MOSFETs with on-resistances of 670 mΩ (P-ch, VI = 3.6 V) and 540 mΩ (N-ch, VI = 3.6 V), supports dynamic output-voltage positioning via comparator thresholds (±0.8%/±1.6% around VOUT), and features digital self-calibration that adjusts duty cycle in ~1% steps to maintain ±3% output voltage accuracy over line and load variations.

Key Specifications

Pinout & Package

TPS62220DDCR is housed in a 5-pin TSOT23 (DDC) package - ultra-thin, surface-mount, lead-free, RoHS-compliant, with 0.65 mm pitch and 2.9 mm × 1.6 mm footprint - optimized for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62220DDCR, TPS62231DDCT trades output current and pin compatibility for higher frequency and smaller magnetics, while TPS62260DDCR increases current and eliminates PFM-related frequency variation at the cost of reduced light-load efficiency and loss of dynamic voltage positioning.

Availability

TPS62220DDCR is available at Aetrix Electronics and suitable for smartphone baseband power, PDA DSP core supply, WLAN PC card modules, and portable media player SoC applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS62220DDCR 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 connectivity technologies, with decades of expertise in power management ICs for portable and industrial systems.

The TPS6222x product line was designed specifically for high-efficiency, space-constrained battery-powered applications - delivering synchronous buck conversion with integrated MOSFETs, adaptive PFM/PWM control, and minimal external component count in ultra-thin packages.

FAQ

What is the minimum input voltage required for TPS62220DDCR to maintain regulation at 400 mA output?

The minimum input voltage depends on output voltage, load current, and component losses. For example, at VO = 1.5 V and IO = 400 mA, with rDS(on)_Pch = 670 mΩ (max) and inductor DCR = 50 mΩ, VI,min ≈ 1.5 V + 0.4 A × (0.67 Ω + 0.05 Ω) = 1.79 V. However, the device requires ≥2.5 V per recommended operating conditions - so practical minimum is 2.5 V, enabled by 100% duty-cycle operation near dropout.

Can TPS62220DDCR be used with a 3.3 V input to generate 1.2 V output?

Yes. TPS62220DDCR supports input voltages from 2.5 V to 6 V and adjustable output from 0.7 V to VI. To set VO = 1.2 V, use a resistor divider on FB where R1/R2 = (1.2 V / 0.5 V) − 1 = 1.4, e.g., R1 = 470 kΩ and R2 = 332 kΩ (standard value), ensuring R1 + R2 ≤ 1 MΩ for low quiescent current. The TPS62220DDCR maintains ±3% accuracy across load and temperature.

Does TPS62220DDCR require external compensation components?

No. TPS62220DDCR features fully internal loop compensation optimized for standard output filters (e.g., 4.7 µH inductor + 10–22 µF ceramic capacitor). External compensation is unnecessary for fixed configurations. When using the adjustable version, optional RC networks across the feedback divider (e.g., C1 = 15 pF, C2 = 100 pF) may fine-tune stability for non-standard L-C combinations, but are not required for baseline operation.

How does the power-save mode of TPS62220DDCR affect output voltage accuracy?

In power-save (PFM) mode, TPS62220DDCR maintains output voltage within ±3% tolerance, identical to PWM mode, via digital self-calibration that adjusts duty cycle in ~1% steps. Additionally, it employs dynamic voltage positioning - holding VOUT ~0.8% above nominal at light loads - which improves transient response without degrading steady-state accuracy. This behavior is confirmed in the Electrical Characteristics table for TPS62220 under "Feedback voltage" test conditions.

Is the TPS62220DDCR pin-compatible with other TPS6222x family members like TPS62221DDCR?

Yes - all TPS6222x variants (TPS62220DDCR, TPS62221DDCR, etc.) share identical 5-pin TSOT23 (DDC) package and pinout: Pin 1 = VI, Pin 2 = GND, Pin 3 = EN, Pin 4 = FB, Pin 5 = SW. This allows direct substitution between adjustable (TPS62220) and fixed-output (e.g., TPS62221 = 1.5 V) versions without PCB changes, provided the feedback network is removed or reconfigured accordingly.