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Texas Instruments TPS62221DDCR
- Part No.:
- TPS62221DDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62221DDCR.pdf
- Description:
- IC REG BUCK 1.5V 400MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,577
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Product details
Overview
TPS62221DDCR 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 stable low-voltage power to DSP cores, PMUs, and RF subsystems in battery-powered handheld devices.
For engineers reviewing the TPS62221DDCR datasheet, TPS62221DDCR pinout, TPS62221DDCR application, or TPS62221DDCR equivalent, key selection criteria include its 1.5 V fixed output accuracy (±3%), 15 µA quiescent current in power-save mode, 100% duty-cycle low-dropout operation, and compatibility with 4.7 µH inductors and ceramic output capacitors ≥10 µF.
Technical Context
The TPS62221DDCR implements voltage-mode control with input voltage feed-forward, enabling fast line and load transient response using only small ceramic input/output capacitors. Its internal 0.5 V reference and fixed feedback divider eliminate external resistor networks required by adjustable variants.
It operates in fixed-frequency 1.25-MHz PWM mode under medium-to-heavy loads and automatically transitions to pulse-frequency modulation (PFM) at light loads-reducing switching frequency and quiescent current to 15 µA typical-while maintaining ±3% output regulation over temperature and line variations via digital self-calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±3% over full load (0–400 mA), line (2.5–6 V), and temperature (−40°C to 85°C) ranges |
| Max Output Current | 400 mA continuous; supports peak switch current up to 880 mA for transient headroom |
| Input Voltage Range | 2.5 V to 6 V - compatible with single-cell Li-ion (2.7–4.2 V), 3-cell NiMH/NiCd, or 3.3/5 V rails |
| Quiescent Current | 15 µA typical in power-save mode - enables >100-hour standby in portable systems with 100 mAh batteries |
| Switching Frequency | 1.25 MHz nominal (0.8–1.85 MHz range) - allows use of compact 4.7 µH inductors and <10 mm² total solution size |
| Efficiency Peak | Up to 95% at 200 mA with 3.6 V input and 1.5 V output - minimizes thermal rise in thin-profile handheld PCBs |
| Duty Cycle Range | 100% dropout operation - sustains regulation down to VI = VO + IO × rDS(on)_P + IL × RL, extending battery runtime |
Pinout & Package
TPS62221DDCR is housed in a 5-pin TSOT23 (DDC) package - 2.9 mm × 1.6 mm × 0.8 mm, 0.95 mm pitch - optimized for space-constrained portable designs. Thermal resistance θJA = 250°C/W; rated for 400 mW power dissipation at TA ≤ 25°C, derated linearly above.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Power Input | Accepts 2.5–6 V supply; requires local 4.7 µF ceramic decoupling; connects directly to battery or intermediate rail |
| 2 - GND | Ground Reference | System ground return for power switches, control logic, and feedback; must be low-impedance connection to minimize noise |
| 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 - prevents erratic startup |
| 4 - FB | Feedback Input | Internally connected to fixed 1.5 V divider; no external resistors needed - simplifies layout and eliminates trimming errors |
| 5 - SW | Switch Node | Drives external 4.7 µH inductor; carries high di/dt; requires short, wide trace to minimize EMI and voltage spikes |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output-Voltage Positioning | Maintains output 0.8% above nominal (1.512 V) at light load - provides headroom to absorb 400 mA transients without droop below 1.425 V |
| Digital Self-Calibration | Adjusts duty cycle in ~1% digital steps when VO deviates >±1.6% - achieves near-zero line/load regulation without external compensation |
| Soft Start | Four-step current ramp (83 → 167 → 335 → 670 mA) limits inrush - prevents input rail collapse during cold start from weak sources like coin cells |
| Undervoltage Lockout (UVLO) | Activates at VI < 1.5 V (typical), hysteresis ~0.5 V - blocks operation during brownout, avoiding undefined switching behavior |
| Synchronous Rectification | Integrated P-channel high-side and N-channel low-side MOSFETs (rDS(on) = 670/540 mΩ @ 3.6 V) - eliminates external Schottky loss, boosting efficiency |
Applications
| Smartphone Application Processor Core | PDA Memory & I/O Supply |
|---|---|
Use Scenario: Powers ARM Cortex-A8 core in smartphone SoC requiring clean, tightly regulated 1.5 V at up to 400 mA with rapid load transients during burst processing. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering low-noise DC power; replaces discrete buck controller + FETs to reduce BOM count and footprint. Use Value: 95% peak efficiency and 15 µA quiescent current extend talk time by >12% versus legacy 1.2 MHz converters; 100% duty cycle extends usable battery range down to 1.6 V. |
Use Scenario: Supplies SDRAM, NAND flash, and touchscreen controller in pocket PC where board space is limited to <15 mm² per rail. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing stable 1.5 V rail independent of battery voltage sag during data transfer bursts. Use Value: TSOT23-5 package and three-external-component design achieve <12 mm² solution size; dynamic voltage positioning reduces need for oversized output capacitance. |
| WLAN PC Card Baseband IC | Portable Media Player DSP Subsystem |
Use Scenario: Powers IEEE 802.11b/g baseband ASIC in credit-card-sized WLAN module with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter generating low-noise 1.5 V supply synchronized to host interface clock edges. Use Value: 1.25 MHz fixed switching frequency places harmonics outside 2.4 GHz ISM band; integrated MOSFETs eliminate gate-drive loop radiation. |
Use Scenario: Supplies TI TMS320C55x DSP core and audio codec in MP3 player requiring ultra-low IQ to support multi-day playback on 500 mAh battery. IC Role / Device Role / Timing Role: Main system regulator managing deep-sleep wake-up sequences and burst-mode audio decoding loads. Use Value: Power-save mode cuts IQ to 15 µA during idle - enabling >200 hours of standby; soft-start prevents pop-noise in audio path during resume. |
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 |
|---|---|---|---|
| TPS62220DDCR | Adjustable output (0.7 V to VI) via external resistor divider; same pinout, package, and electrical specs otherwise | Requires two external resistors and optional compensation caps; used where multiple output voltages share same PCB layout | Select TPS62220DDCR only if output voltage flexibility or dynamic reconfiguration is required; adds BOM cost and layout complexity |
| TPS62227DDCR | Fixed 1.2 V output; identical architecture, package, and performance envelope except reference voltage and feedback network | Targets lower-core-voltage processors (e.g., OMAP-L137, MSP430FRxx) needing tighter margin at 1.2 V ±3% | Choose TPS62227DDCR when system-level voltage scaling mandates 1.2 V; not interchangeable with TPS62221DDCR due to different FB ratio |
Compared with TPS62221DDCR, TPS62220DDCR offers design flexibility at the cost of added components and calibration effort, while TPS62227DDCR serves distinct voltage domains - neither is pin-compatible nor functionally substitutable without schematic and layout revision.
Availability
TPS62221DDCR is available at Aetrix Electronics and suitable for smartphone application processor cores, PDA memory supplies, WLAN PC card baseband ICs, and portable media player DSP subsystems requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TPS62221DDCR 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 connectivity technologies, with decades of expertise in power management ICs for portable and industrial applications.
The TPS6222x family was designed specifically for space- and efficiency-critical battery-powered handheld devices - delivering high integration, minimal external components, and adaptive power-save operation without compromising transient response.
FAQ
What is the guaranteed output voltage tolerance for TPS62221DDCR across temperature and load?
The TPS62221DDCR guarantees ±3% output voltage accuracy over the full operating ambient temperature range (−40°C to 85°C), input voltage range (2.5 V to 6 V), and output load current (0 to 400 mA). This specification is verified per TI's SLVS491E datasheet and includes effects of line regulation (0.26%/V), load regulation (0.0014%/mA), and internal reference drift. The TPS62221DDCR achieves this via digital self-calibration that adjusts duty cycle in ~1% steps when output deviates beyond ±1.6% of nominal 1.5 V.
Can TPS62221DDCR operate with a 4.7 µH inductor and 10 µF output capacitor?
Yes, TPS62221DDCR is fully validated with a 4.7 µH inductor and 10 µF ceramic output capacitor for 1.5 V output - as shown in the typical application circuit on page 13 of the SLVS491E datasheet. This combination meets stability requirements and delivers >90% efficiency at 200 mA with 3.6 V input. For optimal transient response and reduced output ripple, TI recommends ≥22 µF output capacitance when VO ≤ 2 V, but 10 µF remains functional and stable per design guidelines.
Does TPS62221DDCR support 100% duty-cycle operation, and what is the minimum input voltage for regulation?
Yes, TPS62221DDCR supports true 100% duty-cycle operation - the P-channel high-side switch remains fully on - enabling regulation down to VI = VO + IO × rDS(on)_P + IL × RL. At 400 mA load and 1.5 V output, with typical rDS(on)_P = 670 mΩ and 20 mΩ inductor DCR, minimum VI is ~1.78 V. This extends usable battery life in single-cell Li-ion systems by leveraging voltage down to ~1.8 V before dropout, confirmed in Section 8.3.12 of the datasheet.
How does the enable (EN) pin function on TPS62221DDCR, and what happens during shutdown?
The EN pin on TPS62221DDCR is an active-high logic input: pulling it to VI enables regulation, pulling it to GND forces shutdown with 0.1 µA typical quiescent current. During shutdown, both internal P-channel and N-channel MOSFETs turn off, the internal feedback divider disconnects, and all control circuitry powers down. The pin must never be left floating - TI specifies mandatory termination to avoid erratic behavior. Reverse leakage into SW is limited to 1 µA when external voltage is present at VOUT during shutdown.
Is TPS62221DDCR compatible with ceramic input capacitors, and what value is recommended?
Yes, TPS62221DDCR is explicitly designed for ceramic input capacitors - its voltage-mode control with input feed-forward ensures stability with low-ESR types. TI recommends a minimum 4.7 µF X5R/X7R ceramic capacitor placed within 3 mm of the VI and GND pins. This value suppresses high-frequency switching noise and maintains input voltage stability during 400 mA load steps, as validated in the "Typical Application" schematic (page 1) and "Input Capacitor Selection" guidance (Section 8.2.2.1).
TPS62221DDCR 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
TPS62221DDCR FAQ
1.How can I place an order for TPS62221DDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62221DDCR 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 TPS62221DDCR reliable?
The price and inventory of TPS62221DDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62221DDCR is usually 5 days.
3.What payment methods are accepted for TPS62221DDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62221DDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62221DDCR?
TPS62221DDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62221DDCR 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 TPS62221DDCR?
For technical support, including TPS62221DDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62221DDCR requirements.
6.How does Aetrix verify that TPS62221DDCR is sourced from the original manufacturer or authorized distributors?
All TPS62221DDCR 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 TPS62221DDCR meets industry standards.
7.What is the process for return or replacement of TPS62221DDCR?
All TPS62221DDCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62221DDCR, 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 TPS62221DDCR part is unused and in its original packaging.
Return procedure for TPS62221DDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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