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Texas Instruments TPS62229DDCR
- Part No.:
- TPS62229DDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62229DDCR.pdf
- Description:
- IC REG BUCK 1.7V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,505
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Product details
Overview
TPS62229DDCR from Texas Instruments is a 400-mA, 1.25-MHz synchronous step-down DC-DC converter in TSOT23-5 package, delivering fixed 1.8 V output from 2.5–6 V input. It features 15 µA quiescent current in power-save mode, 95% peak efficiency, and dynamic output-voltage positioning for transient response optimization-used to power OMAP™ processors and low-voltage DSPs in smart phones.
For engineers reviewing the TPS62229DDCR datasheet, TPS62229DDCR pinout, TPS62229DDCR application, or TPS62229DDCR equivalent, key selection factors include its fixed 1.8 V output, 1.25-MHz PWM operation with PFM light-load mode, 100% duty-cycle dropout capability, soft-start function, and TSOT23-5 footprint compatibility with space-constrained portable designs.
Technical Context
The TPS62229DDCR employs voltage-mode control with input voltage feed-forward for fast line/load regulation and stable operation with small ceramic capacitors. Its internal digital self-calibration adjusts duty cycle in ~1% VOUT steps to maintain ±3% output accuracy across load and line variations.
Under light load, it enters pulse-frequency modulation (PFM) power-save mode-reducing switching frequency and quiescent current to 15 µA typical-while maintaining dynamic voltage positioning via comparator thresholds set at +0.8% and +1.6% of nominal VOUT to minimize transient droop/overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±3% over full load (0–400 mA) and input range (2.5–6 V) |
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion (2.7–4.2 V) and 3.3/5 V rails |
| Max Output Current | 400 mA continuous - sufficient for core supply of OMAP-L137, TMS320C55x DSPs |
| Switching Frequency | 1.25 MHz nominal (0.8–1.85 MHz range) - enables compact 4.7 µH inductor & 10 µF ceramic output cap |
| Quiescent Current | 15 µA typical in power-save mode - extends battery life in standby/sleep states |
| Efficiency Peak | 95% at 200 mA, VIN = 3.7 V, VOUT = 1.8 V - minimizes thermal rise in thin-SOT23 package |
| Duty Cycle Range | 100% dropout operation - maintains regulation down to VIN ≈ VOUT + IOUT × rDS(on) |
Pinout & Package
TPS62229DDCR is housed in a 5-pin TSOT23 (DDC) package - 2.9 mm × 1.6 mm × 0.8 mm, surface-mount, lead-free, RoHS-compliant. Thermal resistance θJA = 250 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Input supply rail | Accepts 2.5–6 V; connects to input capacitor (min 4.7 µF ceramic); must be decoupled near pin |
| 2 - GND | Power ground reference | Low-impedance return path for switch node and feedback; requires solid PCB ground plane |
| 3 - EN | Enable control input | Active-high logic: ≥1.3 V enables, ≤0.4 V disables; draws ≤0.1 µA in shutdown |
| 4 - FB | Feedback sense node | Internally connected to 1.8 V reference; no external divider required for fixed-output version |
| 5 - SW | Switch node | Drives external 4.7 µH inductor; high dv/dt node requiring tight layout and Kelvin connection to inductor |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output-Voltage Positioning | Maintains VOUT at +0.8% during light load to provide headroom for 400 mA transients without undershoot |
| Soft Start | Digital current ramp (83 → 167 → 335 → 670 mA) limits inrush into output capacitor, preventing input rail collapse |
| 100% Duty-Cycle Operation | Enables regulation down to VIN = VOUT + IOUT × rDS(on), maximizing usable battery voltage range |
| Internal Digital Self-Calibration | Adjusts duty cycle in ~1% VOUT steps to hold output within ±3% across line/load/temperature |
| Ultra-Low Shutdown Current | 0.1 µA typical - critical for always-on backup rails and energy-harvesting systems |
Applications
| Smartphone Application Processor Core Supply | Portable Media Player Audio Codec Bias |
|---|---|
|
Use Scenario: Powers ARM9-based application processor core (e.g., OMAP-L137) requiring stable 1.8 V at up to 400 mA during video decode bursts. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated core voltage; operates in PWM mode under load, switches to PFM during UI idle periods. Use Value: 95% efficiency at 200 mA reduces thermal load in sealed handset enclosure; 15 µA quiescent current extends standby time by >12 hours per charge cycle. |
Use Scenario: Supplies clean 1.8 V bias to stereo audio DAC/ADC in flash-based MP3 players with 200-hour battery life target. IC Role / Device Role / Timing Role: Low-noise point-of-load converter; uses ceramic caps only and avoids EMI-sensitive linear regulators. Use Value: Dynamic voltage positioning prevents audible pop/click during playback start/stop; 100% duty cycle sustains operation until battery reaches 1.9 V. |
| WLAN PC Card Baseband IC Supply | PDA Main System Rail (1.8 V) |
|
Use Scenario: Delivers 1.8 V to TI WL1271 WLAN baseband IC in mini-PCI express cards, handling 300 mA burst transmit currents. IC Role / Device Role / Timing Role: High-transient-response buck converter synchronized to RF activity; soft-start prevents interference during card enumeration. Use Value: 4.7 µH inductor + 10 µF output cap meets size constraints of 30 × 50 mm card; PFM mode cuts average current to 18 µA during receive-only intervals. |
Use Scenario: Provides main system rail for ARM7-based PDA running Windows Mobile, supporting USB host, LCD, and NAND flash simultaneously. IC Role / Device Role / Timing Role: Primary system buck; EN pin controlled by PMIC to sequence power-up with memory and display controllers. Use Value: TSOT23-5 footprint saves >30% board area vs. SOIC-8 alternatives; undervoltage lockout (1.5–2.0 V threshold) prevents brownout resets during battery swap. |
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 specs and pinout - same family, same production lot traceability | No functional difference; TPS62222DDCR and TPS62229DDCR both specify 1.8 V nominal with ±3% tolerance | Select TPS62222DDCR if dual-sourcing or second-source qualification is required; identical performance and layout |
| TPS622314DSCR | 1.8 V fixed, 600 mA output, 2.05 V min input, 1.8 MHz switching - higher current, tighter input range, smaller 2.0 × 2.0 mm WSON | Supports higher peak loads (e.g., LTE modem bursts) but requires redesign for lower VIN capability and new layout | Choose TPS622314DSCR only when >400 mA sustained current or <2.5 V input operation is needed; not drop-in compatible |
Compared with TPS62229DDCR, TPS62222DDCR offers identical electrical behavior and mechanical fit, while TPS622314DSCR delivers higher current and frequency at the cost of reduced input voltage range and non-interchangeable packaging - making the former a true alternative and the latter a functional upgrade requiring design revision.
Availability
TPS62229DDCR is available at Aetrix Electronics and suitable for smartphone power management, portable media player subsystems, and WLAN baseband IC supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production lots.
Supply support for TPS62229DDCR 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-constrained, battery-powered devices requiring high efficiency across wide load ranges - targeting PDAs, smart phones, and DSP-based portable equipment with stringent thermal and size constraints.
FAQ
What is the output voltage tolerance of the TPS62229DDCR over temperature and load?
The TPS62229DDCR maintains a fixed 1.8 V output with ±3% tolerance across the full operating ambient temperature range (−40°C to +85°C) and full load range (0–400 mA), as verified under VI = 2.5 V to 6 V conditions per the SLVS491E datasheet. This specification includes contributions from line regulation (0.26%/V), load regulation (0.0014%/mA), and internal reference drift.
Does the TPS62229DDCR require external feedback resistors?
No, the TPS62229DDCR does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to the 0.5 V reference and the output divider - unlike the adjustable TPS62220, which requires R1/R2. External components on FB would disrupt regulation and are not supported.
What is the minimum input voltage required for regulation at 400 mA output?
At 400 mA output, the TPS62229DDCR maintains regulation down to approximately VIN = VOUT + IOUT × rDS(on)(P-ch) + IOUT × RL. Using max rDS(on) = 850 mΩ (at VIN = 2.5 V) and a typical 20 mΩ inductor DCR, minimum VIN ≈ 1.8 V + 0.4 A × 0.87 Ω ≈ 2.15 V - well within its 2.5 V min rating, enabling robust dropout operation.
Can the TPS62229DDCR be used with a 2.2 µF output capacitor?
No - the TPS62229DDCR requires a minimum 10 µF ceramic output capacitor for stable operation with its internal compensation. For 1.8 V output (≤2 V), TI specifies ≥22 µF when using 4.7 µH inductors. Using 2.2 µF risks instability, excessive output ripple (>50 mV), and failure to meet ±3% accuracy due to shifted loop bandwidth and phase margin erosion.
How does the enable pin (EN) behave during power sequencing?
The EN pin of the TPS62229DDCR is active-high with VIH = 1.3 V min and VIL = 0.4 V max. When pulled below 0.4 V, the device enters shutdown with 0.1 µA typical current and both MOSFETs disabled. It must never be left floating; TI recommends tying to VI through a 100 kΩ resistor if unused. Soft-start initiates only upon EN rising above VIH.
TPS62229DDCR 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):
- 1.7V
- 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
TPS62229DDCR FAQ
1.How can I place an order for TPS62229DDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62229DDCR 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 TPS62229DDCR reliable?
The price and inventory of TPS62229DDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62229DDCR is usually 5 days.
3.What payment methods are accepted for TPS62229DDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62229DDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62229DDCR?
TPS62229DDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62229DDCR 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 TPS62229DDCR?
For technical support, including TPS62229DDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62229DDCR requirements.
6.How does Aetrix verify that TPS62229DDCR is sourced from the original manufacturer or authorized distributors?
All TPS62229DDCR 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 TPS62229DDCR meets industry standards.
7.What is the process for return or replacement of TPS62229DDCR?
All TPS62229DDCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62229DDCR, 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 TPS62229DDCR part is unused and in its original packaging.
Return procedure for TPS62229DDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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