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Texas Instruments TPS62228DDCR
- Part No.:
- TPS62228DDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62228DDCR.pdf
- Description:
- IC REG BUCK 1.875V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,399
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Product details
Overview
TPS62228DDCR 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, enters power-save mode (PFM) below ~66 mA, and achieves up to 95% efficiency in portable Li-Ion or 3.3/5 V rail applications.
For engineers reviewing the TPS62228DDCR datasheet, TPS62228DDCR pinout, TPS62228DDCR application, or TPS62228DDCR equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency vs. load curves, exact package mapping to TSOT23-5, and two rigorously cross-checked alternative parts for 1.875 V buck conversion in space-constrained battery-powered systems.
Technical Context
The TPS62228DDCR uses voltage-mode control with input-voltage feed-forward to deliver fast line/load regulation using only ceramic input/output capacitors. Its internal 0.5 V reference and fixed 1.875 V output are set by factory-trimmed feedback resistors - no external divider required.
Under light load, it transitions to pulse-frequency modulation (PFM) with dynamic voltage positioning: output rises to +0.8% of nominal (1.90 V) to absorb transient drops, then regulates back to ±3% tolerance across -40°C to 85°C ambient. Quiescent current drops to 15 µA typical in PFM mode, while undervoltage lockout prevents operation below 1.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.875 V ±3% over full load/temperature range - enables direct replacement of LDOs without external resistor tuning. |
| Max output current | 400 mA continuous - supports core logic rails for OMAP™ processors and low-power DSPs in handheld devices. |
| 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), and standard 3.3 V/5 V system rails. |
| Switching frequency | 1.25 MHz typical (0.8–1.85 MHz range) - allows use of compact 4.7 µH inductors and 10 µF ceramic output capacitors. |
| Quiescent current | 15 µA typical in power-save mode - extends battery life in standby states of PDAs, smart phones, and WLAN cards. |
| Efficiency peak | Up to 95% at 200 mA / 3.7 V input - minimizes thermal dissipation in thin-SOT23 package with 250°C/W θJA. |
| Enable threshold | EN high ≥1.3 V, low ≤0.4 V - supports direct interfacing with 1.8 V/3.3 V GPIO without level-shifting. |
Pinout & Package
TPS62228DDCR is housed in a 5-pin TSOT23 (DDC) package - 2.9 mm × 1.6 mm × 0.9 mm, 0.95 mm pitch - optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Input supply | Accepts 2.5–6 V; must be decoupled with ≥4.7 µF ceramic capacitor close to pin for stable PWM operation. |
| 2 - GND | Power ground | Primary return path for switch current and feedback reference; requires low-impedance connection to PCB ground plane. |
| 3 - EN | Enable control | Active-high logic input; pulling to GND disables converter and reduces quiescent current to 0.1 µA. |
| 4 - FB | Feedback sense | Internally connected to fixed 1.875 V divider; left unconnected in fixed-output version - no external resistors needed. |
| 5 - SW | Switch node | Drives external 4.7 µH inductor; carries high di/dt switching current - requires short, wide trace and Kelvin grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic output-voltage positioning | Maintains +0.8% headroom at light load (1.90 V) to absorb 400 mA transients without undershoot - enables 10 µF output capacitor instead of 22 µF. |
| 100% duty-cycle low-dropout mode | Continues regulation down to VIN = VOUT + IOUT × rDS(on) - maximizes usable battery voltage in Li-Ion systems. |
| Digital self-calibration | Adjusts duty cycle in 1% VOUT digital steps when output deviates >±1.6%, achieving near-zero line/load regulation error. |
| Soft-start circuit | Staged current limiting (83 → 167 → 335 → 670 mA) prevents input rail collapse during startup into large output capacitance. |
| Internal loop compensation | Eliminates need for external compensation components - simplifies design and improves reliability across temperature. |
Applications
| PDAs and Pocket PCs | Smart Phones |
|---|---|
Use Scenario: Powering ARM9-based application processors and SRAM during active UI navigation and background sync. IC Role / Device Role / Timing Role: Primary 1.875 V core supply with fast load-step response to handle CPU burst currents up to 400 mA. Use Value: 95% efficiency at 200 mA extends talk time; 15 µA quiescent current preserves battery during idle screen-off states. |
Use Scenario: Supplying baseband modem and audio codec subsystems requiring tightly regulated 1.875 V with minimal noise coupling. IC Role / Device Role / Timing Role: Low-noise buck regulator operating in PFM mode during voice call standby, switching to PWM during data transmission bursts. Use Value: Dynamic voltage positioning ensures <100 mV undershoot during 0→400 mA load steps - avoids processor brownout resets. |
| OMAP™ Processor Core Rails | Digital Cameras |
Use Scenario: Delivering clean 1.875 V to OMAP-L137/DM355 DSP cores in portable media players and industrial HMIs. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with 1.25 MHz switching - avoids interference with video clock domains. Use Value: TSOT23-5 footprint saves board area vs. larger buck modules; internal compensation eliminates tuning effort. |
Use Scenario: Powering image sensor interface and JPEG encoder ASICs during photo capture sequences with intermittent 300–400 mA peaks. IC Role / Device Role / Timing Role: Fast-transient buck converter enabling 100 ms wake-up from sleep to full capture readiness. Use Value: 100% duty-cycle operation extracts final 0.3 V from depleted Li-Ion cells - increases usable shots per charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62222DDCR | Fixed 1.8 V output; identical package, pinout, and electrical specs except VOUT. | Suitable where system logic requires exactly 1.8 V (e.g., certain FPGA I/O banks), not 1.875 V. | Select if 1.8 V matches target rail; verify timing margins with 75 mV lower output. |
| TPS62229DDCR | Fixed 1.7 V output; same TSOT23-5 package, 400 mA rating, and PFM/PWM architecture. | Used in ultra-low-power microcontrollers or sensors needing 1.7 V bias, where 1.875 V would exceed max VDD. | Choose when downstream IC absolute maximum rating is <1.85 V - avoids overvoltage stress. |
Compared with TPS62228DDCR, TPS62222DDCR provides 1.8 V for legacy logic compatibility, while TPS62229DDCR offers 1.7 V for newer ultra-low-voltage MCUs - both retain identical efficiency, thermal performance, and layout compatibility in TSOT23-5.
Availability
TPS62228DDCR is available at Aetrix Electronics and suitable for PDAs, smart phones, and OMAP™ processor designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS62228DDCR 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 designed specifically for space-constrained, battery-powered applications demanding high efficiency across wide load ranges - targeting PDAs, smart phones, and DSP-based portable media devices.
FAQ
What is the output voltage tolerance of the TPS62228DDCR over temperature and load?
The TPS62228DDCR delivers a fixed 1.875 V output with ±3% tolerance across the full operating range: -40°C to 85°C ambient temperature and 0–400 mA load current. This specification is guaranteed in the Electrical Characteristics table under "Fixed output voltage" test conditions, with worst-case deviation measured at 2.5 V input and extreme temperatures.
Does the TPS62228DDCR require external feedback resistors to set its output voltage?
No, the TPS62228DDCR does not require external feedback resistors. It is a fixed-output variant with internal resistor trimming that sets the output to 1.875 V. The FB pin is internally connected and must remain unconnected - unlike the adjustable TPS62220, which requires an external R1/R2 divider.
What is the minimum input voltage at which the TPS62228DDCR maintains regulation at 400 mA output?
At 400 mA load, the TPS62228DDCR maintains regulation down to approximately 2.15 V input, calculated using the 100% duty-cycle equation: VIN(min) = VOUT + IOUT × rDS(on,P)(max) + IOUT × RL. With rDS(on,P)(max) = 850 mΩ and typical inductor DCR <100 mΩ, this yields ~2.15 V - enabling full utilization of discharged Li-Ion cells.
How does the TPS62228DDCR achieve high efficiency at light loads?
The TPS62228DDCR achieves high light-load efficiency by entering power-save mode (PFM), reducing switching frequency and lowering quiescent current to 15 µA typical. In this mode, it uses dynamic voltage positioning - raising output to +0.8% of nominal - to minimize capacitor size while maintaining transient response, all without external components.
Can the TPS62228DDCR be used with a 4.7 µH inductor and 10 µF output capacitor?
Yes, the TPS62228DDCR is fully compatible with a 4.7 µH inductor and 10 µF ceramic output capacitor - this combination is explicitly validated in the Application Information section for output voltages >2 V. For 1.875 V, TI recommends ≥22 µF if using 4.7 µH, but 10 µF remains stable due to dynamic voltage positioning and internal compensation.
TPS62228DDCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
TPS62228DDCR FAQ
1.How can I place an order for TPS62228DDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62228DDCR 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 TPS62228DDCR reliable?
The price and inventory of TPS62228DDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62228DDCR is usually 5 days.
3.What payment methods are accepted for TPS62228DDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62228DDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62228DDCR?
TPS62228DDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62228DDCR 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 TPS62228DDCR?
For technical support, including TPS62228DDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62228DDCR requirements.
6.How does Aetrix verify that TPS62228DDCR is sourced from the original manufacturer or authorized distributors?
All TPS62228DDCR 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 TPS62228DDCR meets industry standards.
7.What is the process for return or replacement of TPS62228DDCR?
All TPS62228DDCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62228DDCR, 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 TPS62228DDCR part is unused and in its original packaging.
Return procedure for TPS62228DDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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