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Texas Instruments TPS62228DDCTG4
- Part No.:
- TPS62228DDCTG4
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62228DDCTG4.pdf
- Description:
- IC REG BUCK 1.875V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
TPS62228DDCTG4 from Texas Instruments is a fixed-output, synchronous step-down DC-DC converter delivering 1.875 V at up to 400 mA from a 2.5–6 V input. It operates at 1.25 MHz PWM under medium-to-heavy load and transitions to power-save mode (PFM) at light loads, achieving up to 95% efficiency with 15 µA quiescent current. Designed for portable Li-Ion/NiMH-powered systems, it powers low-voltage DSPs and application processors in space-constrained handheld devices.
For engineers reviewing the TPS62228DDCTG4 datasheet, TPS62228DDCTG4 pinout, TPS62228DDCTG4 application, or TPS62228DDCTG4 equivalent, key selection criteria include its fixed 1.875 V output, TSOT23-5 package footprint, 100% duty-cycle low-dropout operation, dynamic voltage positioning for transient response, and compatibility with 4.7 µH inductors and ≥22 µF ceramic output capacitors per TI's recommended filter design.
Technical Context
The TPS62228DDCTG4 implements a voltage-mode control architecture with input voltage feed-forward, enabling fast line and load regulation using only small ceramic input/output capacitors. Its internal 0.5 V reference and fixed feedback divider set the 1.875 V output without external resistors.
Under light load, it enters PFM-based power-save mode-reducing switching frequency and quiescent current to ~15 µA-while maintaining regulation via dynamic voltage positioning (0.8% low-threshold, 1.6% high-threshold). At heavy load, it switches at a stable 1.25 MHz with synchronous P-channel/N-channel MOSFETs (typ. 670 mΩ / 540 mΩ on-resistance at 3.6 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.875 V ±3% over full load and line range; enables direct supply to OMAP™/TMS320™ core rails without external feedback. |
| Max output current | 400 mA continuous; supports peak processor loads in PDAs and smart phones without thermal derating at TA ≤70°C. |
| Input voltage range | 2.5 V to 6 V; compatible with single-cell Li-Ion (2.7–4.2 V), 3-cell NiMH (3.6 V nominal), and 3.3/5 V system rails. |
| Switching frequency | 1.25 MHz typical (0.8–1.85 MHz); allows compact 4.7 µH inductor and <1 mm profile filtering in thin-SOT23 layout. |
| Quiescent current | 15 µA typical in power-save mode; extends battery runtime in standby states of portable media players and WLAN cards. |
| Efficiency peak | Up to 95%; achieved at mid-load with 4.7 µH/22 µF output filter, reducing thermal stress in sealed handheld enclosures. |
| Duty cycle | 100% low-dropout operation; sustains regulation down to VI = VO + IO × rDS(on)_P + IL × RL, maximizing usable battery voltage. |
Pinout & Package
TPS62228DDCTG4 is housed in a 5-pin TSOT23 (DDC) package-1.0 mm height, 2.9 mm × 1.6 mm footprint-optimized for ultra-thin portable PCBs. Pin 1 is VI (input), Pin 2 is GND, Pin 3 is EN (enable), Pin 4 is FB (feedback, internally connected for fixed-output version), and Pin 5 is SW (switch node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VI (Pin 1) | Input supply rail | Accepts 2.5–6 V; requires ≥4.7 µF ceramic input capacitor close to pin for EMI suppression and transient response. |
| GND (Pin 2) | Power ground reference | Must be low-impedance connection to PCB ground plane; shared return path for input/output capacitors and inductor. |
| EN (Pin 3) | Enable control input | Logic-high (>1.3 V) enables regulation; logic-low (<0.4 V) shuts down device with 0.1 µA quiescent current-no floating allowed. |
| FB (Pin 4) | Feedback reference node | Internally tied to 0.5 V reference and fixed resistor divider; no external components needed for 1.875 V output. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square wave; requires short, wide trace and adjacent ground pour to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic voltage positioning | Maintains output 0.8% above nominal during light load, providing headroom for 400 mA transient steps without undershoot-enables use of only 22 µF output capacitor. |
| Digital self-calibration | Adjusts duty cycle in ~1% digital steps when output deviates >±1.6% from target, eliminating need for external compensation and ensuring ±3% total tolerance across line/load/temperature. |
| Soft-start circuit | Digitally ramps switch current in 83/167/335/670 mA steps, limiting inrush into 22 µF output cap and preventing input rail collapse from weak batteries. |
| Synchronous rectification | Integrates both P-channel (670 mΩ typ.) and N-channel (540 mΩ typ.) MOSFETs-eliminates external Schottky diode, improving efficiency by ~8% vs. asynchronous designs. |
| 100% duty-cycle mode | Enables dropout as low as VO + IO × rDS(on)_P + IL × RL; extends usable battery life by 12–18 minutes in 1-cell Li-Ion applications. |
Applications
| Smartphone Application Processor Core Supply | PDA DSP Voltage Rail |
|---|---|
Use Scenario: Powers ARM-based application processor cores (e.g., OMAP-L138) requiring tightly regulated 1.875 V at up to 400 mA during burst-mode execution. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering core voltage with dynamic voltage positioning for load transients. Use Value: Achieves <15 mV undershoot during 50–400 mA load steps using only 22 µF output capacitance-reducing BOM count and board area by 30% vs. legacy solutions. | Use Scenario: Supplies TMS320C55x DSP in handheld PDAs where battery life and thin form factor are critical constraints. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter operating in power-save mode during idle periods to minimize quiescent draw. Use Value: 15 µA quiescent current extends standby time to >14 days on a 1000 mAh Li-Ion cell-meeting IEC 62368-1 energy efficiency requirements. |
| Digital Camera Image Sensor Bias | WLAN PC Card Baseband IC Supply |
Use Scenario: Provides clean, low-noise 1.875 V bias to CMOS image sensor analog front-end in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with 1.25 MHz switching-minimizing beat frequencies with sensor pixel clocks. Use Value: 95% peak efficiency reduces thermal rise to <3°C above ambient, preventing image noise drift in enclosed camera modules. | Use Scenario: Powers baseband processor in mini-PCI WLAN cards where 5 V bus must be converted to 1.875 V within strict 12 mm × 12 mm height limit. IC Role / Device Role / Timing Role: Space-optimized buck converter in TSOT23-5 package enabling dual-layer PCB routing without vias. Use Value: 2.9 mm × 1.6 mm footprint saves 42% board area vs. SOIC-8 alternatives-critical for card-edge connector clearance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62222DDCR | Fixed 1.8 V output; identical pinout, package, and electrical specs except output voltage and feedback divider ratio. | Used where 1.8 V core rail is required instead of 1.875 V-common in older OMAP variants and certain FPGA I/O banks. | Select when system-level voltage margin analysis confirms 1.8 V meets minimum VCCINT requirement with worst-case process/temp/voltage corner. |
| TPS62229DDCR | Fixed 1.7 V output; same TSOT23-5 package, 400 mA rating, and power-save architecture-only output voltage differs. | Targeted at newer ultra-low-power microcontrollers (e.g., MSP430FRxx) with tighter core voltage windows and lower active current. | Choose for designs prioritizing lowest possible core voltage to reduce dynamic power (P ∝ V²) while maintaining timing closure at 16 MHz. |
Compared with TPS62228DDCTG4, TPS62222DDCR offers 75 mV lower output for legacy 1.8 V rails but sacrifices 75 mV headroom for transient response; TPS62229DDCR further lowers voltage to 1.7 V for maximum power savings but requires revalidation of core logic timing margins and brown-out detection thresholds.
Availability
TPS62228DDCTG4 is available at Aetrix Electronics and suitable for smartphone application processor supplies, PDA DSP rails, digital camera sensor biasing, and WLAN PC card baseband ICs requiring stable component supply across long production lifecycles.
Supply support for TPS62228DDCTG4 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 90 years of innovation in high-reliability silicon design.
The TPS6222x product line was engineered specifically for battery-powered portable electronics-delivering high efficiency, ultra-small footprint, and intelligent light-load management in thin-SOT23 packages for PDAs, smart phones, and handheld media devices.
FAQ
What is the output voltage tolerance of the TPS62228DDCTG4 over temperature and load?
The TPS62228DDCTG4 maintains a fixed 1.875 V output with ±3% total tolerance across –40°C to +85°C ambient temperature and 0–400 mA load range. This specification includes initial accuracy, line regulation (0.26%/V), load regulation (0.0014%/mA), and thermal drift-all guaranteed by TI's digital self-calibration loop that adjusts duty cycle in ~1% steps when output deviates beyond ±1.6% of nominal.
Does the TPS62228DDCTG4 require external feedback resistors to set its output voltage?
No, the TPS62228DDCTG4 does not require external feedback resistors. As a fixed-output variant in the TPS6222x family, it integrates an internal resistor divider referenced to the 0.5 V internal bandgap-setting the output precisely to 1.875 V. The FB pin (Pin 4) is internally connected and must not be externally loaded or modified.
What inductor and output capacitor values are recommended for the TPS62228DDCTG4?
Texas Instruments specifies a 4.7 µH inductor and ≥22 µF ceramic output capacitor for the TPS62228DDCTG4 when powering loads ≤2 V. This combination ensures stability, achieves dynamic voltage positioning benefits, and limits output voltage undershoot to <15 mV during 400 mA transients. Using smaller capacitors risks instability; larger values are acceptable but offer diminishing returns.
How does the TPS62228DDCTG4 manage efficiency at light load conditions?
The TPS62228DDCTG4 enters power-save mode (PFM) below ~66 mA load, reducing switching frequency and quiescent current to 15 µA typical. It regulates output by pulsing the P-channel switch only when voltage falls below a 0.8% low threshold, then stopping until the 1.6% high threshold is reached-achieving >85% efficiency even at 1 mA load while minimizing battery drain in standby.
Is the TPS62228DDCTG4 pin-compatible with other devices in the TPS6222x family?
Yes, the TPS62228DDCTG4 is fully pin-compatible with all TPS6222x variants-including TPS62220 through TPS62229-in the TSOT23-5 (DDC) package. All share identical pinout (VI, GND, EN, FB, SW), thermal pad layout, and PCB footprint, enabling drop-in replacement across output voltages from 0.7 V (adjustable) to 2.3 V (fixed) without board redesign.
TPS62228DDCTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.875V
- Voltage - Output (Max):
- -
- Current - Output:
- 400mA
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS62228DDCTG4 FAQ
1.How can I place an order for TPS62228DDCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62228DDCTG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS62228DDCTG4 reliable?
The price and inventory of TPS62228DDCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62228DDCTG4 is usually 5 days.
3.What payment methods are accepted for TPS62228DDCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62228DDCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62228DDCTG4?
TPS62228DDCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62228DDCTG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS62228DDCTG4?
For technical support, including TPS62228DDCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62228DDCTG4 requirements.
6.How does Aetrix verify that TPS62228DDCTG4 is sourced from the original manufacturer or authorized distributors?
All TPS62228DDCTG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS62228DDCTG4 meets industry standards.
7.What is the process for return or replacement of TPS62228DDCTG4?
All TPS62228DDCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS62228DDCTG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS62228DDCTG4 part is unused and in its original packaging.
Return procedure for TPS62228DDCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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