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Texas Instruments TPS62228DDCT
- Part No.:
- TPS62228DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62228DDCT.pdf
- Description:
- IC REG BUCK 1.875V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
TPS62228DDCT 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 integrates P- and N-channel MOSFETs, operates at 1.25 MHz PWM under load and transitions to power-save mode (PFM) at light loads, achieving up to 95% efficiency. Designed for space-constrained portable systems, it powers core logic in OMAP™ processors and low-voltage DSPs.
For engineers reviewing the TPS62228DDCT datasheet, TPS62228DDCT pinout, TPS62228DDCT application, or TPS62228DDCT equivalent, this page provides verified electrical parameters, TSOT23-5 package details, confirmed functional alternatives, and design-critical behavior including dynamic voltage positioning, 15 µA quiescent current, and 100% duty-cycle dropout operation.
Technical Context
The TPS62228DDCT uses voltage-mode control with input voltage feed-forward to deliver fast line/load regulation using only ceramic input/output capacitors. Its internal digital self-calibration adjusts duty cycle in ~1% output voltage steps to maintain ±3% tolerance across line and load variations without external compensation components.
Under light load, it enters power-save mode with pulse-frequency modulation (PFM), reducing switching frequency and quiescent current to 15 µA typical. Dynamic output-voltage positioning holds output 0.8% above nominal during light load to absorb transient drops, while soft-start limits inrush current via stepped switch-current ramping (83/167/335/670 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion (2.7–4.2 V) and standard 3.3 V/5 V rails without external regulators. |
| Output Voltage | Fixed 1.875 V ±3% - factory-trimmed reference enables precise core supply for OMAP™ and TMS320™ DSPs. |
| Max Output Current | 400 mA - sufficient for processor cores and I/O peripherals in PDAs, smart phones, and portable media players. |
| Switching Frequency | 1.25 MHz typical - enables use of small 4.7 µH inductors and 10–22 µF ceramic output capacitors. |
| Quiescent Current | 15 µA typical in power-save mode - extends battery life in standby and low-activity states. |
| Efficiency Peak | Up to 95% - achieved at medium-to-heavy loads with synchronous rectification eliminating external Schottky losses. |
| Duty Cycle Limit | 100% - maintains regulation down to VI = VO + IO × rDS(on)_P + IL × RL, maximizing usable battery range. |
Pinout & Package
TPS62228DDCT is housed in a 5-pin TSOT23 (DDC) package measuring 2.9 mm × 1.6 mm × 0.8 mm, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Power Input | Accepts 2.5–6 V supply; requires 4.7 µF ceramic input capacitor close to pin for stability and EMI reduction. |
| 2 - GND | Ground Reference | System ground return path; must be low-impedance and thermally connected to PCB copper pour for thermal dissipation. |
| 3 - EN | Enable Control | Active-high logic input; pulled high to enable operation, grounded to enter shutdown (0.1 µA IQ); must not float. |
| 4 - FB | Feedback Input | Internally connected to 0.5 V reference; unused in fixed-output TPS62228DDCT - leave unconnected per datasheet. |
| 5 - SW | Switch Node | Drives external 4.7 µH inductor; high dv/dt node requiring tight layout, minimal trace length, and guard ring to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output-Voltage Positioning | Maintains output 0.8% above nominal during light load to provide headroom for 400 mA transient drops without undershoot. |
| Digital Self-Calibration | Adjusts duty cycle in discrete ~1% output voltage steps to hold ±3% accuracy across temperature, line, and load without external resistors. |
| Soft-Start Ramp | Sequences switch current limits (83 → 167 → 335 → 670 mA) to limit inrush, preventing input rail collapse on weak sources like batteries. |
| 100% Duty-Cycle Operation | Enables regulation down to VI ≈ VO when input voltage sags near output level - critical for full battery utilization in Li-ion systems. |
| Integrated Synchronous Switches | Eliminates need for external rectifier diode; P-channel (670 mΩ typ @ 3.6 V) and N-channel (540 mΩ typ @ 3.6 V) MOSFETs reduce conduction loss. |
Applications
| Smartphone Application Processor Supply | PDA Core Voltage Regulation |
|---|---|
Use Scenario: Powers ARM-based application processors (e.g., OMAP™) in smartphones requiring stable 1.875 V at up to 400 mA during burst-mode operation. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage; manages dynamic load transients via power-save mode and voltage positioning. Use Value: Delivers 95% peak efficiency and 15 µA quiescent current to extend talk time and standby duration without compromising transient response. |
Use Scenario: Supplies core voltage to TMS320™ DSPs in handheld PDAs with variable processing loads and battery-powered operation. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter enabling low-noise, high-efficiency core rail generation with integrated soft-start and UVLO protection. Use Value: Achieves ±3% output accuracy over -40°C to 85°C using digital self-calibration - eliminates need for external trimming or feedback resistors. |
| Digital Camera Image Sensor Bias | WLAN PC Card Power Management |
Use Scenario: Provides clean, regulated 1.875 V to CMOS image sensor logic and interface circuitry in compact digital cameras. IC Role / Device Role / Timing Role: Compact step-down converter operating from 3.3 V system rail; handles pulsed sensor readout currents up to 400 mA. Use Value: TSOT23-5 footprint and 4.7 µH/10 µF external component set minimize board area while maintaining <100 mV transient droop. |
Use Scenario: Generates 1.875 V supply for IEEE 802.11b/g baseband ICs in mini-PCI WLAN cards with strict size and thermal constraints. IC Role / Device Role / Timing Role: High-frequency (1.25 MHz) buck converter enabling small passive selection and reduced EMI filtering requirements. Use Value: 1.25 MHz fixed switching frequency allows use of miniature chip inductors and avoids interference with 2.4 GHz RF bands. |
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 |
|---|---|---|---|
| TPS62222DDCT | Fixed 1.8 V output; identical package, pinout, and electrical specs except output voltage and feedback divider. | Suitable where 1.8 V (not 1.875 V) matches SoC core voltage spec; no revalidation needed beyond output voltage check. | Select when target processor requires exactly 1.8 V - same layout, BOM, and thermal profile apply. |
| TPS62229DDCT | Fixed 1.7 V output; shares all timing, efficiency, and feature characteristics including power-save mode and dynamic positioning. | Used in lower-voltage DSPs or FPGA I/O banks requiring 1.7 V; differs only in output voltage trim and reference calibration. | Choose for designs migrating to 1.7 V rails - drop-in replacement with identical startup, transient, and thermal behavior. |
Compared with TPS62228DDCT, TPS62222DDCT offers 1.8 V output with identical performance envelope, while TPS62229DDCT delivers 1.7 V with matching 15 µA quiescent current and 1.25 MHz operation - both retain dynamic voltage positioning and digital self-calibration, enabling seamless voltage-scaling upgrades without layout changes.
Availability
TPS62228DDCT is available at Aetrix Electronics and suitable for smartphone application processor supplies, PDA core voltage regulation, digital camera image sensor bias, and WLAN PC card power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for TPS62228DDCT 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 ICs, with decades of expertise in high-efficiency DC-DC conversion for portable electronics.
The TPS6222x product line was designed specifically for space- and power-constrained portable devices, delivering high-frequency synchronous buck conversion with integrated MOSFETs, ultra-low IQ, and dynamic voltage positioning for battery longevity.
FAQ
What is the output voltage tolerance of the TPS62228DDCT over temperature and load?
The TPS62228DDCT maintains a fixed 1.875 V output with ±3% tolerance across the full operating range of -40°C to 85°C ambient temperature and 0–400 mA load current. This specification is guaranteed by internal digital self-calibration that adjusts duty cycle in ~1% output voltage steps whenever the output deviates more than ±1.6% from nominal, ensuring consistent accuracy without external components.
Does the TPS62228DDCT require external feedback resistors?
No, the TPS62228DDCT does not require external feedback resistors. As a fixed-output variant, its 1.875 V regulation is achieved via an internal trimmed resistor divider connected to the 0.5 V reference. The FB pin is internally terminated and must remain unconnected in this configuration - unlike the adjustable TPS62220, no external R1/R2 network is needed or supported.
What is the minimum input voltage required for regulation at full load with the TPS62228DDCT?
At 400 mA output, the TPS62228DDCT maintains regulation down to VI ≈ VO + IO × rDS(on)_P_max + IL × RL. Using typical values - VO = 1.875 V, IO = 400 mA, rDS(on)_P_max = 0.85 Ω @ 2.5 V, and assuming a 20 mΩ inductor DCR - minimum VI is approximately 2.25 V. This 100% duty-cycle capability enables full utilization of depleted Li-ion cells.
How does the TPS62228DDCT manage light-load efficiency?
The TPS62228DDCT achieves up to 95% peak efficiency and sustains high light-load efficiency by automatically entering power-save mode (PFM) when load current drops below ~66 mA. In this mode, switching frequency decreases and quiescent current falls to 15 µA typical, while dynamic voltage positioning holds output 0.8% above nominal to preserve transient headroom without increasing static power draw.
Can the TPS62228DDCT be used with a 4.7 µH inductor and 10 µF output capacitor?
Yes, the TPS62228DDCT is fully compatible with a 4.7 µH inductor and 10 µF ceramic output capacitor. The datasheet explicitly lists this combination for output voltages >2 V, and although TPS62228DDCT is rated at 1.875 V, TI confirms stable operation with 4.7 µH/10 µF when paired with proper input capacitance (4.7 µF) and layout - validated in typical application circuits and efficiency curves.
TPS62228DDCT 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
TPS62228DDCT FAQ
1.How can I place an order for TPS62228DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62228DDCT 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 TPS62228DDCT reliable?
The price and inventory of TPS62228DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62228DDCT is usually 5 days.
3.What payment methods are accepted for TPS62228DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62228DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62228DDCT?
TPS62228DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62228DDCT 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 TPS62228DDCT?
For technical support, including TPS62228DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62228DDCT requirements.
6.How does Aetrix verify that TPS62228DDCT is sourced from the original manufacturer or authorized distributors?
All TPS62228DDCT 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 TPS62228DDCT meets industry standards.
7.What is the process for return or replacement of TPS62228DDCT?
All TPS62228DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62228DDCT, 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 TPS62228DDCT part is unused and in its original packaging.
Return procedure for TPS62228DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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