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Texas Instruments TPS62849DLCR
- Part No.:
- TPS62849DLCR
- Manufacturer:
- Texas Instruments
- Package:
- 8-VFDFN
- Datasheet:
-
TPS62849DLCR.pdf
- Description:
- IC REG BUCK 3.4V 750MA 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:17,949
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Product details
Overview
TPS62849DLCR from Texas Instruments is a 3.4-V fixed-output, ultra-low-quiescent-current synchronous step-down converter in an 8-pin SON (DLC) package. It delivers up to 750 mA output current with 60-nA typical operating IQ, supports 1.8–6.5-V input range, and features DCS-Control™ topology for RF-friendly operation in battery-powered IoT sensors and medical patches.
For engineers reviewing the TPS62849DLCR datasheet, TPS62849DLCR pinout, TPS62849DLCR application, or TPS62849DLCR equivalent, this page provides verified technical context, validated pin functions, confirmed 3.4-V fixed-output behavior, real-world efficiency curves at microamp loads, and two rigorously cross-checked alternative options for low-power DC/DC replacement scenarios.
Technical Context
The TPS62849DLCR uses TI's DCS-Control™ architecture-combining hysteretic and voltage-mode control-to achieve seamless PFM/PWM transition, <1.5% output voltage accuracy, and 1.8-MHz nominal switching frequency. Its internal R2D converter is disabled for fixed 3.4-V output, requiring VSET tied directly to GND.
It implements 100% duty-cycle mode (120-nA IQ), STOP pin–enabled noise-free measurement mode, output discharge via VOS pin (up to 44 mA), and thermal shutdown at 160°C. Input UVLO thresholds are 1.72 V (rising) and 1.45 V (falling), with 25-nA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.4 V - no external resistor required; VSET must be connected to GND. |
| Input Voltage Range | 1.8 V to 6.5 V - supports 2S–4S alkaline, 1S–2S Li-MnO₂, or 1S Li-ion/Li-SOCl₂ batteries. |
| Max Output Current | 750 mA - sustained delivery with thermal derating per RθJA = 105.6°C/W (SON-8). |
| Quiescent Current (IQ) | 60 nA typical - measured at VIN = 3.6 V, VOUT = 1.8 V, device switching; 120 nA in 100% mode. |
| Shutdown Current | 25 nA - enables multi-year battery life in always-off sensor nodes. |
| Switching Frequency | 1.8 MHz nominal - enables compact 2.2-µH inductor and 10-µF output capacitor design. |
| Output Discharge | Enabled via VOS pin - sinks up to 44 mA to rapidly discharge VOUT when disabled. |
Pinout & Package
TPS62849DLCR is housed in an 8-pin SON (Small Outline No-lead) package, 1.5 mm × 2.0 mm body size, with exposed thermal pad (EP) connected to GND. Pin 1 is marked by a dot; top-side pin numbering follows standard SON orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground | Primary return path for input/output capacitors and thermal pad; must be low-impedance. |
| VIN (Pin 2) | Input power supply | Accepts 1.8–6.5 V; requires 4.7-µF ceramic capacitor placed adjacent to minimize noise. |
| MODE (Pin 3) | Operating mode control | Low = auto PFM/PWM; high = forced PWM; must be terminated; not available on WCSP. |
| EN (Pin 4) | Enable input | Active-high logic; internal 450-kΩ pulldown prevents floating start-up; disconnects after regulation. |
| VSET (Pin 5) | Output voltage selection | Must be connected to GND for fixed 3.4-V output; no external resistor used. |
| STOP (Pin 6) | Noise suppression control | High = stops switching for quiet rail during precision measurements; internal pulldown active. |
| SW (Pin 7) | Power switch node | Connects to inductor; carries high di/dt; requires short, wide trace and Kelvin connection to GND. |
| VOS (Pin 8) | Output voltage sense & discharge | Directly connects to output capacitor; discharges VOUT internally when EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 60-nA typical operating current extends battery life in multi-year sensor deployments. |
| DCS-Control™ topology | Enables 1.8-MHz switching with <1.5% DC accuracy and seamless PFM/PWM transition for RF coexistence. |
| STOP pin functionality | Halts switching instantly to eliminate switching noise-critical for ADC reference stability in test equipment. |
| Output discharge via VOS | Provides controlled 16–44 mA sink to clear residual charge, preventing latch-up in downstream circuitry. |
| 100% duty-cycle mode | Maintains regulation down to VIN ≈ VOUT with only 120-nA IQ-ideal for end-of-battery-life operation. |
Applications
| Smart Metering | Wearable Medical Sensors |
|---|---|
Use Scenario: Long-life battery-powered gas/water meter with periodic RF transmission and daily metrology sampling. IC Role / Device Role / Timing Role: Primary system regulator supplying MCU, RF transceiver, and precision analog front-end. Use Value: 60-nA IQ and 100% mode extend 3.6-V lithium primary battery life beyond 10 years. |
Use Scenario: Disposable ECG patch with 24/7 monitoring, Bluetooth LE burst upload, and motion artifact rejection. IC Role / Device Role / Timing Role: Single-rail power source for ultra-low-power MCU, analog signal chain, and BLE SoC. Use Value: STOP pin enables noise-free ECG acquisition windows; 3.4-V output matches BLE SoC VDD requirements. |
| Industrial IoT Sensor Nodes | ATEX-Certified Intrinsically Safe Devices |
Use Scenario: Wireless temperature/humidity node deployed in remote factory environments with 10+ year battery target. IC Role / Device Role / Timing Role: Efficient buck converter powering LPWAN transceiver (LoRa/NB-IoT), sensor interface, and sleep-state logic. Use Value: 750-mA capability supports peak transmit currents; 1.8-MHz switching minimizes EMI filter size. |
Use Scenario: Hazardous-area gas detector using intrinsic safety barriers and ultra-low-power sensing. IC Role / Device Role / Timing Role: Safety-critical power stage delivering regulated 3.4 V within energy-limited barrier constraints. Use Value: 25-nA shutdown current ensures compliance with IEC 60079-11 energy limits; thermal shutdown adds fault protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 1.8–3.3 V output (100-mV steps); requires external RSET; same IQ, package, and STOP/MODE pins. | Used where adjustable output is needed (e.g., multiple SoC voltage variants); lacks fixed 3.4-V option. | Select when programmable output is required; VSET resistor network adds BOM cost and layout area. |
| TPS62841DLCR | 0.8–1.55 V output (50-mV steps); same IQ, package, and feature set; VSET mapping differs. | Targets ultra-low-voltage MCUs (e.g., ARM Cortex-M0+) and sub-1-V analog circuits. | Choose for sub-1.8-V rails; incompatible with 3.4-V requirement-no direct functional substitution. |
Compared with TPS62849DLCR, TPS62840DLCR offers flexibility at the cost of external components and calibration overhead, while TPS62841DLCR serves fundamentally different low-voltage domains-neither is pin-compatible nor functionally substitutable without redesign.
Availability
TPS62849DLCR is available at Aetrix Electronics and suitable for smart metering, wearable medical sensors, industrial IoT sensor nodes, ATEX-certified intrinsically safe devices, and test & measurement instrumentation requiring stable component supply across long-lifecycle programs.
Supply support for TPS62849DLCR 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 ICs, with decades of expertise in high-efficiency DC/DC conversion and ultra-low-power system design.
The TPS6284x product line was engineered specifically for battery-powered, long-life applications-including NB-IoT, medical wearables, and intrinsic safety systems-where nanoscale quiescent current and noise-free operation are non-negotiable.
FAQ
What is the output voltage of the TPS62849DLCR, and how is it configured?
The TPS62849DLCR provides a fixed 3.4-V output. Unlike other members of the TPS6284x family, it does not require an external resistor on the VSET pin-instead, VSET must be connected directly to GND to enable the internal 3.4-V setting. This eliminates resistor tolerance errors and simplifies layout for single-rail applications.
Does the TPS62849DLCR support STOP mode, and what is its impact on system noise?
Yes, the TPS62849DLCR supports STOP mode via its dedicated STOP pin. When pulled high, the device halts all switching activity while maintaining output voltage from stored charge in the output capacitor-enabling truly noise-free analog measurements. The internal pulldown resistor ensures safe default behavior when un-driven.
What is the maximum continuous output current of the TPS62849DLCR, and under what conditions?
The TPS62849DLCR delivers up to 750 mA continuously under recommended operating conditions (TJ ≤ 125°C, VIN = 3.6 V, VOUT = 3.4 V). Derating applies above ambient temperatures due to its SON-8 thermal resistance (RθJA = 105.6°C/W); full current is sustainable with adequate PCB copper and airflow in typical 4-layer designs.
How does the TPS62849DLCR achieve ultra-low quiescent current, and what is its typical value?
The TPS62849DLCR achieves 60-nA typical operating IQ through proprietary biasing, deep-sleep circuit partitioning, and DCS-Control™ topology optimization. This value is measured at VIN = 3.6 V, VOUT = 1.8 V, and light-load switching-confirming its suitability for decade-long battery operation in always-on edge sensors.
Is the TPS62849DLCR pin-compatible with other TPS6284x variants like TPS62840DLCR or TPS62841DLCR?
Yes-the TPS62849DLCR shares identical 8-pin SON (DLC) packaging, pinout, and footprint with TPS62840DLCR and TPS62841DLCR. All three support the same EN, MODE, STOP, VOS, SW, VIN, GND, and VSET connections. However, output voltage configuration differs: TPS62849DLCR fixes VOUT = 3.4 V with VSET = GND, while others require resistor-based programming.
TPS62849DLCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VFDFN
- 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):
- 1.8V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.4V
- Voltage - Output (Max):
- -
- Current - Output:
- 750mA
- Frequency - Switching:
- 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSON-HR (2x1.5)
TPS62849DLCR FAQ
1.How can I place an order for TPS62849DLCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62849DLCR 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 TPS62849DLCR reliable?
The price and inventory of TPS62849DLCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62849DLCR is usually 5 days.
3.What payment methods are accepted for TPS62849DLCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62849DLCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62849DLCR?
TPS62849DLCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62849DLCR 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 TPS62849DLCR?
For technical support, including TPS62849DLCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62849DLCR requirements.
6.How does Aetrix verify that TPS62849DLCR is sourced from the original manufacturer or authorized distributors?
All TPS62849DLCR 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 TPS62849DLCR meets industry standards.
7.What is the process for return or replacement of TPS62849DLCR?
All TPS62849DLCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62849DLCR, 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 TPS62849DLCR part is unused and in its original packaging.
Return procedure for TPS62849DLCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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