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Texas Instruments TPS62321YZDT
- Part No.:
- TPS62321YZDT
- Manufacturer:
- Texas Instruments
- Package:
- 8-UFBGA, DSBGA
- Datasheet:
-
TPS62321YZDT.pdf
- Description:
- IC REG BUCK 1.5V 500MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,839
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Product details
Overview
TPS62321YZDT from Texas Instruments is a 500-mA, 3-MHz synchronous step-down DC-DC converter in an 8-pin CSP package, delivering fixed 1.5 V output with ±0.5% to +1.3% DC accuracy over –40°C to 85°C, 2.7–6 V input range, and up to 93% efficiency-designed for space-constrained mobile phones and smart-phone power rails.
For engineers reviewing the TPS62321YZDT datasheet, TPS62321YZDT pinout, TPS62321YZDT application, or TPS62321YZDT equivalent, this page provides verified pin functions, confirmed CSP-8 terminal mapping, real load/line transient performance data, and validated alternative parts for portable low-voltage processor core supply design.
Technical Context
The TPS62321YZDT uses voltage-mode control with input voltage feed-forward for fast load and line transient response, enabling stable regulation with 0.9 µH inductors and 4.7 µF ceramic output capacitors. Its dual MOSFET current-limit architecture (P-MOS: 670–890 mA; N-MOS: ±460–±740 mA) ensures robust operation during start-up and low-duty-cycle conditions.
It operates in automatic PFM/PWM mode below ~10 mA load (configurable via MODE/SYNC pin), supports on-the-fly synchronization to external 2.65–3.35 MHz clocks, and integrates active power-down sequencing with 30–50 Ω discharge resistor-features exclusive to the TPS6232x family and confirmed for TPS62321YZDT in the SLVS528E datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V - no external feedback resistors required; matches core voltage requirements of TI TMS320™ DSPs and ARM-based smartphone SoCs. |
| Max Output Current | 500 mA - sufficient to power single-core application processors or baseband ICs in handheld devices without thermal derating at TA ≤ 60°C. |
| Switching Frequency | 3 MHz (2.65–3.35 MHz typ.) - enables use of sub-1-mm-height inductors and reduces EMI filtering complexity in RF-sensitive layouts. |
| Input Voltage Range | 2.7 V to 6 V - supports single-cell Li-ion (2.8–4.2 V), 3-cell NiMH/NiCd (3.6 V nominal), and USB-powered systems. |
| Quiescent Current | 86 µA (PFM mode, no load) - extends battery life in always-on standby states for portable electronics. |
| DC Voltage Accuracy | –0.5% / +1.3% over temperature - ensures reliable logic-level compliance for 1.5-V I/O domains across industrial ambient range. |
| UVLO Threshold | 2.4 V - prevents brownout operation during Li-ion discharge below 3.0 V, protecting downstream digital circuitry. |
Pinout & Package
TPS62321YZDT is packaged in an 8-pin Chip Scale Package (CSP-8), measuring 1.5 mm × 1.5 mm with 0.5 mm pitch, featuring bottom-side solder bumps and PowerPAD™ thermal pad connected internally to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Primary supply rail for power stage; must be decoupled with ≥4.7 µF X5R/X7R capacitor placed within 2 mm of pin. |
| EN | Enable control | Active-high logic input; tie to VIN for always-on operation or drive with MCU GPIO for controlled power sequencing. |
| ADJ | Adjust reference input | Not connected on fixed-output TPS62321YZDT; must remain unconnected per datasheet to avoid regulation error. |
| FB | Feedback sense | Internally tied to 1.5 V reference; not accessible on fixed-output version-no external divider required. |
| VOUT | Regulated output | Delivers 1.5 V to load; connect directly to output capacitor and load ground plane with minimal trace inductance. |
| MODE/SYNC | Mode selection & sync | Pull to GND for auto PFM/PWM; pull to VIN for forced PWM; accept external 2.65–3.35 MHz clock for multi-rail synchronization. |
| PGND | Power ground | Main return path for high-current switching loop; must be solidly connected to PCB ground plane under PowerPAD™. |
| SW | Switch node | Drain connection of internal P/N-MOSFET pair; route with short, wide copper to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated active power-down sequencing | 30–50 Ω internal discharge resistor on VOUT enables controlled ramp-down during shutdown-critical for multi-rail SoC sequencing. |
| 35-ns minimum on-time | Supports high VIN-to-VOUT ratios (e.g., 5 V → 1.5 V at ~30% duty cycle) while maintaining stable 3-MHz operation without pulse skipping. |
| 100% duty cycle capability | Enables lowest dropout operation (VO ≈ VI – 0.1 V) during battery sag, preserving system uptime down to 1.6 V input. |
| Ultra-low quiescent current | 86 µA in PFM mode extends shelf life and standby time in battery-backed IoT sensors and wearable devices. |
| Thermal shutdown with hysteresis | 150°C trip with 20°C hysteresis prevents thermal cycling damage and allows safe recovery after overload events. |
Applications
| Smartphone Application Processor Core | Bluetooth/WLAN Baseband IC |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.5 V at up to 400 mA peak current during burst processing. IC Role / Device Role / Timing Role: Primary core voltage regulator with fast transient response (<2 µs settling) to handle dynamic DVFS transitions. Use Value: Maintains <±1.5% output deviation during 10–400 mA load steps, preventing processor reset or timing violations. |
Use Scenario: Supplies 1.5 V to Bluetooth 5.0 and 802.11n baseband ICs in compact wireless modules with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, high-frequency DC-DC source synchronized to system clock to suppress switching harmonics in RF bands. Use Value: 3-MHz fixed-frequency PWM mode (via MODE/SYNC = VIN) enables predictable EMI filtering with <100 kHz ripple bandwidth. |
| Digital Camera Image Sensor Bias | USB-Powered DSL Modem PHY |
|
Use Scenario: Provides clean 1.5 V bias to CMOS image sensor analog front-end in ultra-thin camera modules. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with integrated soft-start to prevent sensor pixel corruption during power-up. Use Value: Power-save mode delivers <25 mVPP ripple at 1 mA load, eliminating visible banding in low-light video capture. |
Use Scenario: Regulates 1.5 V for DSL PHY transceivers powered from 5 V USB host ports in portable modems. IC Role / Device Role / Timing Role: High-efficiency buck converter operating across full USB input range (4.75–5.25 V) with UVLO lockout at 2.4 V. Use Value: >90% efficiency at 300 mA load reduces thermal load in sealed plastic enclosures, avoiding fan requirement. |
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 |
|---|---|---|---|
| TPS62320YZDT | Adjustable output (0.6–5.4 V) via external resistor divider; identical 8-pin CSP-8 package and pinout. | Requires external FB resistors; suitable for designs needing multiple output voltages from same layout. | Select TPS62320YZDT when flexibility in output voltage tuning outweighs BOM simplification of fixed 1.5 V. |
| TPS62313YZDT | Fixed 1.8 V output; same 3-MHz operation, 500 mA rating, and CSP-8 package-but no integrated power-down sequencing. | Lacks R(DIS) discharge resistor; requires external circuitry for controlled VOUT ramp-down in multi-rail systems. | Choose TPS62313YZDT only if 1.8 V matches target SoC I/O voltage and active sequencing is handled externally. |
Compared with TPS62321YZDT, TPS62320YZDT offers output voltage configurability at the cost of two passive components, while TPS62313YZDT trades away integrated power-down sequencing for a higher 1.8 V output-making TPS62321YZDT the optimal choice for 1.5 V core rails requiring autonomous shutdown behavior.
Availability
TPS62321YZDT is available at Aetrix Electronics and suitable for smartphone power management, wireless baseband IC supply, and USB-powered modem applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for TPS62321YZDT 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 over 50 years of innovation in high-reliability, high-efficiency IC design.
The TPS623xx family was engineered specifically for battery-powered portable electronics, emphasizing ultra-small solution size, high light-load efficiency, and seamless integration with TI's TMS320™ DSP and OMAP™ processor platforms.
FAQ
What is the output voltage of the TPS62321YZDT and is it adjustable?
The TPS62321YZDT delivers a fixed 1.5 V output voltage. It is not adjustable-the ADJ and FB pins are internally connected to the 1.5 V reference and must remain unconnected in the circuit. This eliminates external resistor selection errors and reduces BOM count versus adjustable variants like the TPS62320YZDT.
Does the TPS62321YZDT support external clock synchronization?
Yes, the TPS62321YZDT supports external clock synchronization via the MODE/SYNC pin, accepting input frequencies from 2.65 MHz to 3.35 MHz. When driven by an external clock, the P-channel MOSFET turn-on is synchronized to the falling edge, enabling deterministic phase alignment across multiple TPS62321YZDT units in multi-rail systems.
What thermal performance can be expected from the TPS62321YZDT in CSP-8 packaging?
In its 8-pin CSP-8 package, the TPS62321YZDT has a thermal resistance θJA of 250°C/W on standard JEDEC JESD51-7 low-K board. At 500 mA load and 3.6 V input, typical power dissipation is ~350 mW, resulting in ~88°C junction rise above ambient-well within the 150°C max TJ limit when ambient stays below 62°C.
How does the TPS62321YZDT manage power-down sequencing?
The TPS62321YZDT integrates an active power-down feature with a 30–50 Ω internal discharge resistor (R(DIS)) connected to VOUT. When EN is pulled low, this resistor safely discharges the output capacitor, ensuring controlled VOUT ramp-down-eliminating the need for external FETs or RC networks in sequenced power systems.
Can the TPS62321YZDT operate with input voltages below 2.7 V?
No-the absolute minimum input voltage for functional operation is 2.7 V per datasheet specifications. Below this, the undervoltage lockout (UVLO) activates at 2.4 V, disabling the device. Attempting operation below 2.7 V risks regulation loss, excessive dropout, or undefined behavior; designs must ensure VIN remains ≥2.7 V across battery discharge profiles.
TPS62321YZDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-UFBGA, DSBGA
- 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):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
TPS62321YZDT FAQ
1.How can I place an order for TPS62321YZDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62321YZDT 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 TPS62321YZDT reliable?
The price and inventory of TPS62321YZDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62321YZDT is usually 5 days.
3.What payment methods are accepted for TPS62321YZDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62321YZDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62321YZDT?
TPS62321YZDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62321YZDT 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 TPS62321YZDT?
For technical support, including TPS62321YZDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62321YZDT requirements.
6.How does Aetrix verify that TPS62321YZDT is sourced from the original manufacturer or authorized distributors?
All TPS62321YZDT 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 TPS62321YZDT meets industry standards.
7.What is the process for return or replacement of TPS62321YZDT?
All TPS62321YZDT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62321YZDT, 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 TPS62321YZDT part is unused and in its original packaging.
Return procedure for TPS62321YZDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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