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Texas Instruments TPS62229DDCT
- Part No.:
- TPS62229DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62229DDCT.pdf
- Description:
- IC REG BUCK 1.7V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
TPS62229DDCT 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 power-save mode (15 µA quiescent current), soft start, 100% duty cycle low-dropout operation, and dynamic output-voltage positioning for portable power rails.
For engineers reviewing the TPS62229DDCT datasheet, TPS62229DDCT pinout, TPS62229DDCT application, or TPS62229DDCT equivalent, this device is selected for compact, high-efficiency Li-ion/NiMH-powered systems requiring stable 1.8-V core supply with minimal board area and light-load efficiency optimization.
Technical Context
The TPS62229DDCT employs voltage-mode PWM control with input voltage feed-forward for fast line/load regulation and uses internal digital self-calibration to maintain ±3% output accuracy across load and line variations. Its dual-mode operation switches between fixed-frequency 1.25-MHz PWM (moderate-to-heavy load) and pulse-frequency modulation (PFM) in power-save mode (light load).
It integrates P-channel and N-channel MOSFETs with typical on-resistances of 670 mΩ (P-ch) and 540 mΩ (N-ch) at 3.6 V, supports dynamic voltage positioning via comparator thresholds (0.8%/1.6% above nominal VO), and enables 100% duty cycle operation to extend battery runtime down to near-VO input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±3% over full load (0–400 mA) and input (2.5–6 V) |
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion (2.7–4.2 V), 3-cell NiMH (3.6 V), and 3.3/5 V rails |
| Max Output Current | 400 mA - sufficient for DSP cores, baseband processors, and low-power microcontrollers |
| Switching Frequency | 1.25 MHz typical - enables use of small 4.7 µH inductors and ceramic capacitors (e.g., 10 µF output) |
| Quiescent Current | 15 µA typical in power-save mode - extends battery life in standby/sleep states |
| Efficiency Peak | Up to 95% - achieved at mid-load with 4.7 µH/10 µF filter and 3.7 V input |
| Enable Threshold | EN high ≥1.3 V, low ≤0.4 V - compatible with standard GPIO logic levels |
Pinout & Package
TPS62229DDCT is housed in a 5-pin TSOT23 (DDC) package - ultra-thin, surface-mount, 2.9 mm × 1.6 mm × 0.8 mm - optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Input supply rail | Accepts 2.5–6 V; requires 4.7 µF ceramic input capacitor for stability |
| 2 - GND | Power ground reference | Must be low-impedance connection to system ground plane; shared return for SW and FB |
| 3 - EN | Enable control input | Active-high logic; pull to VI to enable, to GND to shut down (0.1 µA IQ) |
| 4 - FB | Feedback node | Internally connected to 1.8 V reference; no external divider needed for fixed-output version |
| 5 - SW | Switch node | Connects to inductor; carries high di/dt switching current - requires tight layout and Kelvin grounding |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output-Voltage Positioning | Maintains output 0.8% above nominal (1.814 V) at light load to absorb transient droop during sudden load steps |
| Digital Self-Calibration | Adjusts duty cycle in ~1% digital steps to hold output within ±3% despite line/load shifts - eliminates need for external compensation |
| Soft Start | Staged switch-current ramp (83 → 167 → 335 → 670 mA) limits inrush and prevents input rail collapse during startup |
| 100% Duty Cycle Operation | Enables regulation down to VIN ≈ VOUT + IOUT×rDS(on) - maximizes usable battery voltage range in Li-ion systems |
| Integrated Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency vs. asynchronous buck topologies |
Applications
| Smartphone Baseband Power | PDA Application Processor Rail |
|---|---|
Use Scenario: Powers ARM9/ARM11 application processors in early-generation smartphones requiring clean, regulated 1.8 V core voltage. IC Role / Device Role / Timing Role: Primary step-down regulator supplying CPU core logic; operates in PWM mode during active use and PFM during idle/screen-off states. Use Value: 95% peak efficiency and 15 µA quiescent current directly extend talk time and standby duration without compromising transient response. |
Use Scenario: Delivers stable 1.8 V to OMAP™-class applications processors in handheld PDAs with tight PCB area constraints. IC Role / Device Role / Timing Role: Fixed-output buck converter providing main SoC core supply; leverages 100% duty cycle to utilize full battery discharge curve. Use Value: TSOT23-5 footprint and only three external components (inductor + two capacitors) minimize BOM count and board real estate. |
| Digital Camera Image Sensor Bias | WLAN PC Card Core Supply |
Use Scenario: Supplies low-noise 1.8 V bias to CMOS image sensor logic and interface circuitry in compact digital cameras. IC Role / Device Role / Timing Role: Secondary power rail generator; enters PFM mode during preview mode to reduce system noise and power draw. Use Value: Dynamic voltage positioning ensures <100 mV droop during autofocus activation transients, preventing sensor reset or data corruption. |
Use Scenario: Provides regulated 1.8 V to IEEE 802.11b/g WLAN controller ICs on mini-PCI or CardBus form-factor modules. IC Role / Device Role / Timing Role: Compact, high-SRFR DC-DC converter supporting hot-plug insertion and rapid enable/disable sequencing. Use Value: Fast enable response (<250 µs startup) and shutdown isolation (0.1 µA IQ) meet PC Card power management timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62222DDCT | Fixed 1.8 V output, identical pinout, same electrical specs - direct functional match | No difference; both rated for -40°C to 85°C, same DDC package and thermal performance | Select TPS62222DDCT if sourcing legacy stock; TPS62229DDCT is functionally identical per TI documentation |
| TPS62231DSC | Same 1.8 V output but in 6-pin WSON package; higher 600 mA rating and 2.25 MHz switching frequency | Better suited for higher-current or space-constrained layouts where WSON thermal performance is preferred | Choose TPS62231DSC only when >400 mA capability or improved thermal dissipation is required - not drop-in compatible |
Compared with TPS62222DDCT, TPS62229DDCT offers identical functionality and performance in the same TSOT23-5 package, while TPS62231DSC provides higher current and frequency at the cost of different footprint and non-pin-compatible layout.
Availability
TPS62229DDCT is available at Aetrix Electronics and suitable for smartphone baseband power, PDA processor rails, digital camera sensor bias, and WLAN PC card core supply requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for TPS62229DDCT 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.
The TPS6222x family was designed specifically for portable battery-powered equipment - emphasizing ultra-small size, light-load efficiency, and seamless integration into space- and power-constrained handheld systems.
FAQ
What is the output voltage tolerance of the TPS62229DDCT over temperature and load?
The TPS62229DDCT 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 current (0–400 mA), as verified under specified test conditions (VI = 2.5–6 V). This accuracy is achieved via internal digital self-calibration and reference trimming, eliminating need for external calibration or trimming components in the TPS62229DDCT design.
Does the TPS62229DDCT require an external feedback resistor network?
No, the TPS62229DDCT does not require an external feedback resistor network. As a fixed-output variant (1.8 V), its FB pin is internally connected to the 0.5 V reference and output divider - unlike the adjustable TPS62220DDCT. External resistors are unnecessary, simplifying layout and reducing BOM count in the TPS62229DDCT implementation.
How does the TPS62229DDCT achieve high efficiency at light loads?
The TPS62229DDCT achieves high light-load efficiency by automatically entering power-save mode (PFM), reducing switching frequency and lowering quiescent current to 15 µA typical. In this mode, it regulates output using burst-mode pulses with dynamically adjusted skip thresholds (0.8%/1.6% above nominal VO), minimizing switching losses while maintaining tight voltage regulation - a key feature of the TPS62229DDCT architecture.
What is the minimum input voltage required for regulation at full load with the TPS62229DDCT?
The minimum input voltage for regulation at 400 mA output is calculated as VIN(min) = VO + IO × rDS(on)(max) + IO × RL, where rDS(on)(max) = 850 mΩ (P-ch, 2.5 V), and RL is inductor DCR. For typical 4.7 µH inductors (DCR ≈ 80 mΩ), VIN(min) ≈ 1.8 V + 0.4 A × 0.85 Ω + 0.4 A × 0.08 Ω ≈ 2.17 V - well within the 2.5 V absolute minimum spec, confirming robust low-VIN operation in the TPS62229DDCT.
Can the TPS62229DDCT be used with a 4.7 µH inductor and 10 µF output capacitor?
Yes, the TPS62229DDCT is fully compatible with a 4.7 µH inductor and 10 µF ceramic output capacitor - explicitly validated in TI's application circuits and efficiency curves. This combination delivers optimal transient response and >90% efficiency across 10–400 mA loads at 3.7 V input. The TPS62229DDCT's internal compensation is tuned for such L-C values, ensuring stable operation without external compensation networks.
TPS62229DDCT 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
TPS62229DDCT FAQ
1.How can I place an order for TPS62229DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62229DDCT 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 TPS62229DDCT reliable?
The price and inventory of TPS62229DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62229DDCT is usually 5 days.
3.What payment methods are accepted for TPS62229DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62229DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62229DDCT?
TPS62229DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62229DDCT 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 TPS62229DDCT?
For technical support, including TPS62229DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62229DDCT requirements.
6.How does Aetrix verify that TPS62229DDCT is sourced from the original manufacturer or authorized distributors?
All TPS62229DDCT 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 TPS62229DDCT meets industry standards.
7.What is the process for return or replacement of TPS62229DDCT?
All TPS62229DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62229DDCT, 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 TPS62229DDCT part is unused and in its original packaging.
Return procedure for TPS62229DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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