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Texas Instruments TPS62821DLCT
- Part No.:
- TPS62821DLCT
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerVFDFN
- Datasheet:
-
TPS62821DLCT.pdf
- Description:
- IC REG BUCK ADJ 1A 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
TPS62821DLCT 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 operates from 2.4 V to 5.5 V input and delivers regulated power in portable battery-powered devices requiring high light-load efficiency and fast transient response.
For engineers reviewing the TPS62821DLCT datasheet, TPS62821DLCT pinout, TPS62821DLCT application, or TPS62821DLCT equivalent, key selection criteria include its QFN-8 (2.0 mm × 1.5 mm) package, integrated power good (PG) and enable (EN) functions, seamless PWM-to-PSM mode transition, active output discharge, and compatibility with 470-nH inductors for compact POL designs.
Technical Context
The TPS62821DLCT uses adaptive constant-on-time DCS-Control™ architecture to stabilize switching frequency near 2.2 MHz while enabling fast load transient response and low output voltage ripple. Its internal 35-mΩ high-side and 25-mΩ low-side MOSFETs support continuous 1-A output with cycle-by-cycle current limiting and HICCUP short-circuit protection.
It features dual-mode operation: PWM mode for medium-to-heavy loads (CCM), and power save mode (PSM) at light loads-reducing switching frequency while maintaining regulation and efficiency. The device enters 100% duty-cycle mode when VIN approaches VOUT, sustaining regulation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports single-rail core logic or I/O supplies in space-constrained applications. |
| Input Voltage Range | 2.4 V to 5.5 V - compatible with single-cell Li-ion, USB, and 3.3-V/5-V system rails. |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures stable output regulation across industrial temperature range. |
| Quiescent Current | 4 µA - enables >10-year battery life in always-on IoT sensors and wearables. |
| Switching Frequency | Typ. 2.2 MHz - allows use of small 470-nH inductors and 10-µF ceramic output capacitors. |
| Package | QFN-8 (2.0 mm × 1.5 mm, 0.5-mm pitch) - surface-mount, thermally enhanced, suitable for automated assembly. |
| Protection Features | HICCUP current limit, thermal shutdown (150°C), UVLO (2.2 V with 160 mV hysteresis), active output discharge - reduces need for external fault management circuitry. |
Pinout & Package
TPS62821DLCT is housed in a thermally optimized 2.0 mm × 1.5 mm, 0.5-mm pitch VQFN-8 (DLC) package with exposed thermal pad (PGND-connected) for efficient heat dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic; threshold ~0.9 V (rising), ~0.7 V (falling); must not be left floating. |
| 2 - FB | Feedback sensing node | Connects to resistor divider; regulates VOUT via 0.6-V internal reference with ±1% accuracy. |
| 3 - AGND | Analog ground reference | Internally tied to PGND; may be left floating but recommended to tie to local analog ground plane. |
| 4 - NC | No-connect terminal | Internally unconnected; may be tied to VOUT, GND, or left floating per layout requirements. |
| 5 - PGND | Power ground return | Primary return path for high-current switch node; must be connected to thermal pad and low-impedance ground plane. |
| 6 - SW | Switch node | Drives external inductor; carries high di/dt; requires tight layout with minimal loop area to reduce EMI. |
| 7 - VIN | Input power supply | Accepts 2.4–5.5 V; requires local 4.7-µF ceramic capacitor placed adjacent to VIN and PGND pins. |
| 8 - PG | Power good open-drain output | Signals regulation status; requires external pull-up; sinks ≤1 mA; deglitched with 100-µs rise/fall delay. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Enables stable 2.2-MHz operation with <10-mV output voltage deviation during 1-A load steps - eliminates need for external compensation. |
| 100% duty-cycle mode | Maintains regulation when VIN drops within ~200 mV of VOUT - extends usable input range in brownout conditions without dropout. |
| Active output discharge | Discharges VOUT through SW pin when EN = Low (75–400 mA sink) - prevents back-powering of upstream circuitry and supports hot-swap sequencing. |
| Seamless PSM/PWM transition | No audible noise or output voltage glitch during mode change - critical for noise-sensitive analog and RF subsystems. |
| CISPR-11 Class B compliance | Meets conducted and radiated EMI limits without shielding or ferrite beads - simplifies EMC certification for end equipment. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by coin cell, requiring ultra-low IQ and stable 1.8-V rail for ADC and BLE SoC. IC Role / Device Role / Timing Role: Primary POL regulator delivering 1-A peak current with <4-µA standby draw and sub-100-µs wake-up response. Use Value: Enables >5-year battery life and meets IEC 60601-1 leakage current limits via active discharge and low-noise PSM operation. |
Use Scenario: DIN-rail mounted sensor interface module operating in factory ambient (–40°C to +85°C) with 24-V DC input. IC Role / Device Role / Timing Role: Local 3.3-V supply for isolated digital I/O drivers and microcontroller, handling 1-A burst loads during fieldbus polling. Use Value: Maintains ±1% output accuracy across full temperature range and survives 150°C thermal shutdown events without latch-off. |
| SSD Power Management | Point-of-Sale Terminal Core Logic |
|
Use Scenario: M.2 NVMe SSD requiring tightly regulated 1.2-V core voltage with fast transient response to NAND flash write bursts. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting 1-A dynamic load steps at 2.2 MHz, minimizing output capacitance footprint. Use Value: Achieves >92% efficiency at 1-A/1.2-V with 470-nH inductor and 2×10-µF X7R ceramics - reduces thermal density in confined SSD cavity. |
Use Scenario: Compact retail terminal with ARM Cortex-A53 SoC, requiring reliable 1.0-V core rail from 5-V USB-C input. IC Role / Device Role / Timing Role: Main SoC core regulator with PG signal for firmware-controlled power sequencing and brownout detection. Use Value: Integrates power good monitoring, soft-start (1.25-ms), and UVLO hysteresis - eliminates need for discrete supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62822DLCT | 2-A output current; identical pinout, package, and feature set - higher RDS(on) (35 mΩ HS) vs TPS62821 (35 mΩ HS). | Supports higher current loads (e.g., multi-core processors); same PCB layout but requires larger inductor and output caps. | Select TPS62822DLCT only if sustained >1-A load is required; otherwise TPS62821DLCT offers better light-load efficiency at lower cost. |
| TPS62086RLTR | 1-A, 2.5-V to 6-V input; 3-MHz fixed frequency; no PG or active discharge; 2.5-µA IQ; WSON-8 (2.0 mm × 2.0 mm). | Lacks power good signaling and active discharge; smaller thermal pad; less robust for hot-swap or sequencing-critical systems. | Choose TPS62086RLTR only for cost-sensitive, non-sequencing applications where PG and discharge are omitted - not drop-in compatible. |
Compared with TPS62822DLCT, the TPS62821DLCT provides optimal efficiency at ≤1-A loads and lower BOM cost; versus TPS62086RLTR, it adds essential system-level features (PG, discharge, UVLO hysteresis) at marginally higher IQ - making it preferred for industrial and medical designs requiring functional safety awareness.
Availability
TPS62821DLCT is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, SSD power management, and point-of-sale terminal core logic requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS62821DLCT 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-reliability DC-DC conversion.
The TPS6282x family was designed specifically for space-constrained, battery-powered applications demanding ultra-low quiescent current, high accuracy, and seamless light-load efficiency - targeting portable, industrial, and computing endpoints.
FAQ
What is the maximum output current capability of the TPS62821DLCT?
The TPS62821DLCT is rated for 1-A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its current limit is 1.7–2.4 A (typ.), enabling short-duration peak loads. Sustained operation above 1 A requires derating based on ambient temperature and copper area - refer to RθJA = 114.1°C/W (JEDEC PCB) for thermal modeling.
Does the TPS62821DLCT support adjustable output voltage, and what is the range?
Yes, the TPS62821DLCT supports fully adjustable output voltage from 0.6 V to 4.0 V using an external resistor divider on the FB pin. The internal reference is 0.6 V ±1% over –40°C to +125°C. For example, a 100-kΩ R2 and 200-kΩ R1 sets VOUT = 1.8 V. R2 should be ≤120 kΩ to ensure ≥5 µA divider current for noise immunity.
How does the power good (PG) function operate on the TPS62821DLCT?
The TPS62821DLCT's PG pin is an open-drain output that goes high-impedance when VFB is within 94–112% of the target (e.g., 0.564–0.672 V for 0.6-V ref). It pulls low during startup, shutdown, UVLO, or thermal fault. A 10-kΩ pull-up to VOUT is typical. PG has 100-µs delay on rising edge and 20-µs deglitch on falling edge - enabling reliable system power sequencing.
Can the TPS62821DLCT start into a pre-biased output?
Yes, the TPS62821DLCT supports start-up into a pre-biased output. Its soft-start circuit controls the high-side FET gate drive to avoid reverse current flow from the output capacitor, preventing bus contention or damage. This capability is confirmed in TI's SLVSDV6C datasheet Section 8.3.2 and validated on the TPS6282xEVM-005 evaluation module.
What inductor value is recommended for use with the TPS62821DLCT?
Texas Instruments recommends a 470-nH inductor (±20%) with ≥4.6-A saturation current and low DCR (e.g., Coilcraft XFL4015-471ME, TDK TFM201610ALC-R47MTAA). The device is optimized for this value to achieve stable 2.2-MHz operation, minimal output ripple, and high efficiency across 0.1–1-A loads - though 1-µH inductors are also supported per datasheet Table 3.
TPS62821DLCT 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)
TPS62821DLCT FAQ
1.How can I place an order for TPS62821DLCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62821DLCT 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 TPS62821DLCT reliable?
The price and inventory of TPS62821DLCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62821DLCT is usually 5 days.
3.What payment methods are accepted for TPS62821DLCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62821DLCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62821DLCT?
TPS62821DLCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62821DLCT 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 TPS62821DLCT?
For technical support, including TPS62821DLCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62821DLCT requirements.
6.How does Aetrix verify that TPS62821DLCT is sourced from the original manufacturer or authorized distributors?
All TPS62821DLCT 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 TPS62821DLCT meets industry standards.
7.What is the process for return or replacement of TPS62821DLCT?
All TPS62821DLCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62821DLCT, 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 TPS62821DLCT part is unused and in its original packaging.
Return procedure for TPS62821DLCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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