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Texas Instruments TPS62821DLCR
- Part No.:
- TPS62821DLCR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerVFDFN
- Datasheet:
-
TPS62821DLCR.pdf
- Description:
- IC REG BUCK ADJ 1A 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,345
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Product details
Overview
TPS62821DLCR from Texas Instruments is a 1-A synchronous step-down DC-DC converter with DCS-Control™ topology, 4 µA quiescent current, 2.2 MHz switching frequency, and 1% feedback voltage accuracy (0.6 V to 4 V output). It delivers regulated POL power in space-constrained battery-powered systems such as portable SSDs and point-of-sale terminals.
For engineers reviewing the TPS62821DLCR datasheet, TPS62821DLCR pinout, TPS62821DLCR application, or TPS62821DLCR equivalent, key selection criteria include its QFN-8 (2.0 mm × 1.5 mm) package, 2.4–5.5 V input range, 100% duty-cycle capability, active output discharge, and seamless PWM-to-PSM mode transition under light load.
Technical Context
The TPS62821DLCR employs adaptive constant-on-time DCS-Control™ for fast transient response and stable 2.2 MHz operation across input and load variations. Its internal 35 mΩ high-side and 25 mΩ low-side MOSFETs enable high efficiency at 1-A continuous output with minimal external components.
It integrates EN/PG logic, undervoltage lockout (2.2 V threshold), thermal shutdown (150 °C), cycle-by-cycle current limiting (1.7–2.4 A), and soft-start (1.25 ms). Power Good uses a window comparator (94–107% of VFB) with 100 µs rise/fall delay and open-drain output requiring external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports compact single-rail POL supplies without derating at TJ ≤ 125 °C |
| Input Voltage Range | 2.4 V to 5.5 V - compatible with single-cell Li-ion, USB PD, and 3.3 V/5 V system rails |
| Feedback Accuracy | ±1% over –40 °C to +125 °C - ensures tight regulation for core voltage domains in industrial and embedded applications |
| Quiescent Current | 4 µA - enables >10-year battery life in always-on IoT sensors and wearables |
| Switching Frequency | 2.2 MHz typical - allows use of small 470 nH inductors and 0603 ceramic capacitors for ultra-compact layouts |
| Package | QFN-8 (2.0 mm × 1.5 mm, 0.4 mm pitch) - thermally enhanced for PCB heat spreading in dense PCB assemblies |
| Protection Features | HICCUP current limit, thermal shutdown (150 °C), UVLO (2.2 V), active output discharge - eliminates need for external fault-handling circuitry |
Pinout & Package
TPS62821DLCR is housed in a thermally optimized 2.0 mm × 1.5 mm, 0.4 mm pitch VQFN-8 (DLC) package with exposed thermal pad. Pin 5 (PGND) and Pin 3 (AGND) are internally connected but separately routed for optimal noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-high logic (VH = 1.0 V, VL = 0.4 V); must not float; controls startup/shutdown and activates internal discharge path |
| 2 - FB | Feedback input | Connects to resistive divider; regulates output to 0.6 V reference with ±1% accuracy; 10–50 nA leakage minimizes divider error |
| 3 - AGND | Analog ground | Signal reference for FB and control circuitry; internally tied to PGND but recommended for separate low-noise routing |
| 4 - NC | No-connect | Internally unconnected; may be left floating, tied to GND, or connected to VOUT per layout requirements |
| 5 - PGND | Power ground | High-current return path for SW node; must be solidly connected to thermal pad and input/output capacitor grounds |
| 6 - SW | Switch node | Drives external inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI and ringing |
| 7 - VIN | Input supply | 2.4–5.5 V input rail; decoupled by ≥4.7 µF ceramic capacitor placed adjacent to VIN and PGND pins |
| 8 - PG | Power good output | Open-drain status signal; pulls low during UVLO, thermal shutdown, or EN=low; requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Enables <10 µs load transient response with minimal output capacitance, eliminating need for external compensation |
| 100% duty-cycle operation | Supports dropout operation down to VIN – VOUT ≈ 100 mV (at 1 A), extending battery runtime in low-VOUT applications |
| Seamless PSM/PWM transition | Maintains <10 mV output ripple across 10 µA–1 A load range without audible switching or regulation disturbance |
| Internal soft-start | 1.25 ms controlled ramp prevents inrush current and enables reliable start-up into pre-biased outputs |
| Active output discharge | 75–400 mA sink via SW pin during shutdown ensures rapid VOUT decay (<1 ms), meeting sequencing requirements |
Applications
| Portable SSD Power Supply | Point-of-Sale Terminal Core Rail |
|---|---|
|
Use Scenario: Regulating 3.3 V or 1.8 V from a 5 V USB-C or Li-ion source for NAND flash and controller ICs in handheld SSDs. IC Role / Device Role / Timing Role: Primary POL regulator delivering tightly regulated, low-noise 1-A output with fast transient response to handle burst NAND read/write loads. Use Value: 4 µA quiescent current extends standby battery life; 2.2 MHz switching enables <2 mm² total solution size with 470 nH inductor and 0603 capacitors. |
Use Scenario: Generating 1.2 V or 1.8 V core voltage for ARM-based payment processors in compact countertop POS terminals. IC Role / Device Role / Timing Role: System-level buck converter providing stable core rail with Power Good signaling for safe processor boot and reset coordination. Use Value: 1% VFB accuracy ensures compliance with processor VDD tolerance; PG pin enables firmware-controlled power sequencing and fault detection. |
| Industrial Sensor Node MCU Supply | Factory Automation I/O Module Bias Rail |
|
Use Scenario: Powering ultra-low-power Cortex-M0+ microcontrollers and analog front-ends in battery-operated wireless sensor nodes. IC Role / Device Role / Timing Role: Always-on system regulator supporting deep-sleep modes with sub-µA system current and fast wake-up response. Use Value: 4 µA IQ enables >10-year battery life on coin cell; seamless PSM-to-PWM transition avoids voltage droop during wake-up bursts. |
Use Scenario: Providing isolated 3.3 V bias for digital I/O isolators and level translators in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Secondary DC-DC stage converting 5 V or 12 V backplane voltage to clean 3.3 V logic rail with robust EMI performance. Use Value: CISPR 11 Class B compliance simplifies EMC certification; thermal shutdown (150 °C) ensures reliability in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62822DLCR | 2-A output rating, identical pinout and BOM; higher RDS(on) (35 mΩ HS vs TPS62821's 35 mΩ) but same 2.2 MHz FSW | Supports higher current loads (e.g., multi-core SoCs); requires larger inductor and output caps for thermal margin | Select when design headroom exceeds 1 A or future scalability to 2 A is required; no PCB change needed |
| TPS620861RLTR | 1-A, 2.5–6 V input, 1.8–5.5 V fixed/adjustable output; 2.25 MHz FSW; 5.5 µA IQ; QFN-10 package | Wider input range and higher max VOUT; different pin count and layout; lacks PG and active discharge | Choose for designs needing >5.5 V input or fixed-output variants; verify PG signal and discharge requirements are non-critical |
Compared with TPS62822DLCR, the TPS62821DLCR offers lower cost and smaller thermal footprint for 1-A applications, while TPS620861RLTR trades PG functionality and active discharge for broader input flexibility and fixed-output convenience - neither is pin-compatible, but both serve overlapping POL use cases.
Availability
TPS62821DLCR is available at Aetrix Electronics and suitable for portable SSDs, point-of-sale terminals, industrial sensor nodes, factory automation I/O modules, and battery-powered embedded controllers requiring stable component supply across production lifecycles.
Supply support for TPS62821DLCR 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 TPS6282x family was designed specifically for ultra-compact, high-efficiency point-of-load regulation in battery-powered and space-constrained industrial applications - emphasizing low IQ, fast transient response, and seamless light-load operation.
FAQ
What is the maximum output current supported by the TPS62821DLCR?
The TPS62821DLCR supports up to 1 A of continuous output current under recommended operating conditions (TJ ≤ 125 °C, proper PCB thermal design). Its current limit is specified at 1.7–2.4 A (typical 2.1 A), enabling robust overload handling without external current sensing.
Does the TPS62821DLCR require an external feed-forward capacitor (CFF)?
The TPS62821DLCR does not require CFF for basic stability, but adding a 120 pF feed-forward capacitor across R1 improves transient response - especially with large output capacitance (>22 µF). TI recommends CFF for applications demanding <10 µs load-step recovery.
Can the TPS62821DLCR operate with a 2.4 V input and 2.2 V output?
Yes - the TPS62821DLCR supports 100% duty-cycle operation, enabling regulation down to VOUT = VIN – (IOUT × RDS(on) + IOUT × DCRL). At 1 A, this yields ~2.2 V output from 2.4 V input using typical 35 mΩ HS FET and low-DCR inductor.
How is power good (PG) behavior defined during startup and fault conditions for the TPS62821DLCR?
For the TPS62821DLCR, PG transitions from low to high-impedance ~100 µs after VFB reaches 94% of target. It asserts low during EN=low, UVLO (VIN < 2.2 V), thermal shutdown (TJ > 150 °C), or VFB outside 94–107% window - enabling precise system sequencing and fault reporting.
What thermal performance can be expected from the TPS62821DLCR in a standard 2-layer PCB layout?
In a JEDEC-standard 2-layer PCB (1 oz Cu, 100 mm² copper pour under thermal pad), the TPS62821DLCR exhibits RθJA = 114.1 °C/W. With proper layout (solid PGND plane, thermal vias to inner layers), it sustains 1 A continuous output at ambient ≤ 65 °C without forced airflow or heatsink.
TPS62821DLCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerVFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSON-HR (2x1.5)
TPS62821DLCR FAQ
1.How can I place an order for TPS62821DLCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62821DLCR 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 TPS62821DLCR reliable?
The price and inventory of TPS62821DLCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62821DLCR is usually 5 days.
3.What payment methods are accepted for TPS62821DLCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62821DLCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62821DLCR?
TPS62821DLCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62821DLCR 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 TPS62821DLCR?
For technical support, including TPS62821DLCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62821DLCR requirements.
6.How does Aetrix verify that TPS62821DLCR is sourced from the original manufacturer or authorized distributors?
All TPS62821DLCR 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 TPS62821DLCR meets industry standards.
7.What is the process for return or replacement of TPS62821DLCR?
All TPS62821DLCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62821DLCR, 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 TPS62821DLCR part is unused and in its original packaging.
Return procedure for TPS62821DLCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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