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Texas Instruments TPS62221DDCT
- Part No.:
- TPS62221DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62221DDCT.pdf
- Description:
- IC REG BUCK 1.5V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,033
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Product details
Overview
TPS62221DDCT from Texas Instruments is a fixed-output 1.5 V, 400-mA synchronous step-down DC-DC converter in TSOT23-5 package, operating from 2.5 V to 6 V input with 1.25-MHz PWM switching and power-save mode for high efficiency across load range. It delivers regulated power to low-voltage DSPs and processors in portable electronics.
For engineers reviewing the TPS62221DDCT datasheet, TPS62221DDCT pinout, TPS62221DDCT application, or TPS62221DDCT equivalent, key selection criteria include its 1.5 V fixed output, 15 µA quiescent current in power-save mode, 95% peak efficiency, 100% duty-cycle low-dropout operation, and TSOT23-5 thermal performance (250°C/W junction-to-ambient).
Technical Context
The TPS62221DDCT uses voltage-mode control with input voltage feed-forward for fast line/load regulation and stable operation with small ceramic capacitors. Its dual-mode operation switches between fixed-frequency 1.25-MHz PWM at medium-to-heavy loads and pulse-frequency modulation (PFM) at light loads to maintain >90% efficiency down to 1 mA.
Internal digital self-calibration adjusts duty cycle in ~1% output voltage steps to hold regulation within ±3% over line and load variations. The device integrates P-channel (670 mΩ typ @ 3.6 V) and N-channel (540 mΩ typ @ 3.6 V) MOSFETs, supports soft-start via stepped current limiting (83/167/335/670 mA), and enters 100% duty-cycle mode below dropout threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±3% over full load and input range - ensures stable core supply for 1.5 V logic domains. |
| Max Output Current | 400 mA continuous - sufficient for TMS320 DSP cores and OMAP subsystems without external boost. |
| 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 3.3/5 V rails. |
| Quiescent Current | 15 µA typical in power-save mode - extends battery life in standby states of PDAs and smart phones. |
| Switching Frequency | 1.25 MHz nominal (0.8–1.85 MHz range) - enables use of compact 4.7 µH inductors and <10 µF ceramic output caps. |
| Efficiency Peak | Up to 95% at 200 mA - minimizes thermal rise in thin-SOT23 package under typical portable load conditions. |
| Duty Cycle Max | 100% - maintains regulation down to VIN = VOUT + IOUT × rDS(on), extending usable battery voltage range. |
Pinout & Package
TSOT23-5 package: 2.9 mm × 1.6 mm × 0.8 mm, 5-pin surface-mount, exposed pad not present, rated for 400 mW at TA ≤25°C with 4 mW/°C derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Power Input | Accepts 2.5–6 V supply; connects to input capacitor and battery rail; must be decoupled with ≥4.7 µF ceramic. |
| 2 - GND | Ground Reference | System ground return for power path and feedback; requires low-impedance PCB connection to minimize noise coupling. |
| 3 - EN | Enable Control | Active-high logic input; pull to VI to enable, to GND to shut down (0.1 µA IQ); must not float. |
| 4 - FB | Feedback Sense | Internally connected to 1.5 V reference; tied directly to output for fixed-version regulation; no external divider needed. |
| 5 - SW | Switch Node | Drives external 4.7 µH inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output-Voltage Positioning | Maintains output 0.8% above nominal during light load to absorb heavy transient drops without undershoot. |
| Soft Start | Staged current limiting (83/167/335/670 mA) prevents input rail collapse during startup from weak sources like batteries. |
| Integrated Power MOSFETs | P-channel (670 mΩ) and N-channel (540 mΩ) switches eliminate external FETs and reduce BOM count and layout area. |
| Internal Loop Compensation | Enables stable operation with standard 4.7 µH / 10 µF output filter - no external compensation components required. |
| Undervoltage Lockout | Activates below 1.5–2.0 V input to prevent erratic switching and ensure clean start-up from depleted batteries. |
Applications
| PDAs and Pocket PCs | Smart Phones |
|---|---|
Use Scenario: Powering ARM-based application processors and memory interfaces in handheld computing devices with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 1.5 V core supply regulator delivering up to 400 mA with dynamic voltage positioning to handle CPU burst loads. Use Value: 95% peak efficiency and 15 µA quiescent current extend active runtime and standby time without requiring heatsinking. | Use Scenario: Supplying baseband and application processor cores in space-constrained mobile handsets operating from 3.4–4.2 V battery. IC Role / Device Role / Timing Role: Fixed 1.5 V step-down converter enabling direct integration into compact PMIC subsystems with minimal external components. Use Value: TSOT23-5 footprint and 1.25-MHz switching allow <15 mm² total solution size, critical for slim form factors. |
| OMAP™ and Low-Power DSP Supply | Digital Cameras |
Use Scenario: Providing tightly regulated 1.5 V core voltage to TI OMAP processors in portable multimedia devices. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting dynamic voltage scaling and rapid load transients during video encode/decode. Use Value: Fast voltage-mode control and digital self-calibration achieve <±3% output tolerance across temperature and load, ensuring reliable DSP operation. | Use Scenario: Powering image sensor interfaces and ISP cores in compact digital still cameras powered by AA/AAA alkaline or Li-ion packs. IC Role / Device Role / Timing Role: Main 1.5 V supply with 100% duty-cycle capability to utilize full battery voltage range down to 1.5 V under load. Use Value: Maintains regulation until battery reaches end-of-discharge, maximizing usable capacity and eliminating premature shutdown. |
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 package, pinout, and electrical specs except VOUT. | Used where system requires 1.8 V I/O or core rail instead of 1.5 V; same PCB layout but different feedback network not needed. | Select when target voltage matches 1.8 V; no design change beyond output cap and inductor re-rating. |
| TPS62224DDCT | Fixed 1.6 V output; shares all timing, thermal, and control characteristics with TPS62221DDCT. | Suitable for mixed-voltage SoCs needing 1.6 V analog or interface supplies; same thermal profile and enable behavior. | Choose for 1.6 V bias requirements; drop-in replacement with identical board footprint and layout. |
Compared with TPS62221DDCT, TPS62222DDCT provides higher output voltage for I/O domains while maintaining identical efficiency and quiescent current, whereas TPS62224DDCT offers intermediate 1.6 V regulation for systems requiring tighter voltage margins between core and peripheral rails.
Availability
TPS62221DDCT is available at Aetrix Electronics and suitable for PDAs, smart phones, and OMAP™ processor supply applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for TPS62221DDCT 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 broad industrial, automotive, and consumer reach.
The TPS6222x product line was designed specifically for high-efficiency, space-constrained portable power applications-delivering regulated low-voltage rails from single-cell batteries or standard voltage rails with minimal external components.
FAQ
What is the output voltage accuracy of the TPS62221DDCT over temperature and load?
The TPS62221DDCT maintains output voltage within ±3% over –40°C to +85°C ambient temperature and 0–400 mA load range, achieved via internal digital self-calibration that adjusts duty cycle in ~1% steps based on real-time feedback error detection. This specification applies across the full 2.5–6 V input range and is verified per TI SLVS491E datasheet Section 6.5.
Does the TPS62221DDCT require external compensation components?
No, the TPS62221DDCT features fully integrated loop compensation optimized for standard 4.7 µH inductors and 10 µF ceramic output capacitors. External compensation is unnecessary for stable operation; only input/output capacitors and the inductor are required. This simplifies layout and reduces BOM count compared to controllers requiring external compensation networks.
How does the TPS62221DDCT behave during battery voltage droop near end-of-life?
The TPS62221DDCT supports 100% duty-cycle operation, allowing it to maintain regulation as input voltage approaches the output voltage (1.5 V). When VIN falls below VOUT + IOUT × rDS(on), the P-channel switch remains continuously on, extracting maximum usable energy from the battery before shutdown occurs at the undervoltage lockout threshold (~1.5–2.0 V).
What is the recommended inductor value for the TPS62221DDCT?
Texas Instruments specifies 4.7 µH as the minimum inductor value for the TPS62221DDCT, with 10 µH recommended for fixed-output versions. For this part, a 4.7 µH shielded power inductor rated for ≥670 mA saturation current and low DCR (<150 mΩ) is optimal to balance efficiency, transient response, and PCB area. Inductor selection must also consider core losses at 1.25 MHz switching frequency.
Can the TPS62221DDCT be used in place of the adjustable TPS62220DDCT?
No - the TPS62221DDCT is a fixed 1.5 V output device with internal feedback divider; it cannot replace the adjustable TPS62220DDCT without circuit redesign. The TPS62220DDCT requires external resistor dividers on the FB pin to set output voltage, while the TPS62221DDCT ties FB internally to 1.5 V reference. Substitution would require removing the external divider and verifying stability with the fixed internal network.
TPS62221DDCT 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):
- 1.5V
- 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
TPS62221DDCT FAQ
1.How can I place an order for TPS62221DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62221DDCT 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 TPS62221DDCT reliable?
The price and inventory of TPS62221DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62221DDCT is usually 5 days.
3.What payment methods are accepted for TPS62221DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62221DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62221DDCT?
TPS62221DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62221DDCT 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 TPS62221DDCT?
For technical support, including TPS62221DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62221DDCT requirements.
6.How does Aetrix verify that TPS62221DDCT is sourced from the original manufacturer or authorized distributors?
All TPS62221DDCT 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 TPS62221DDCT meets industry standards.
7.What is the process for return or replacement of TPS62221DDCT?
All TPS62221DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62221DDCT, 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 TPS62221DDCT part is unused and in its original packaging.
Return procedure for TPS62221DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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