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Texas Instruments TPS62840DLCR
- Part No.:
- TPS62840DLCR
- Manufacturer:
- Texas Instruments
- Package:
- 8-VFDFN
- Datasheet:
-
TPS62840DLCR.pdf
- Description:
- IC REG BUCK ADJ 750MA 8VSON
- Quantity:
- Payment:
- Shipping:
Inventory:10,994
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Product details
Overview
TPS62840DLCR from Texas Instruments is an ultra-low-quiescent-current synchronous step-down DC/DC converter designed for battery-powered IoT and medical sensors. It delivers up to 750 mA output current with 60 nA typical operating IQ, supports 1.8 V–6.5 V input, offers 16 selectable output voltages (1.8 V–3.3 V in 100-mV steps) via VSET resistor, and features STOP pin for noise-free measurement in test equipment.
For engineers reviewing the TPS62840DLCR datasheet, TPS62840DLCR pinout, TPS62840DLCR application, or TPS62840DLCR equivalent, key selection criteria include its 60-nA quiescent current at light load, DCS-Control™ topology for RF-friendly operation, 100% duty-cycle mode (120-nA IQ), output discharge function, and SON-8 (DLC) package compatibility with space-constrained wearable and smart meter designs.
Technical Context
The TPS62840DLCR implements TI's DCS-Control™ topology-combining hysteretic and voltage-mode control for seamless PFM/PWM transition, <1% output voltage ripple, and fast transient response. Its dual-path quiescent current architecture draws 36 nA into VIN and 56 nA into VOS under no-load, non-switching conditions at 25°C.
It integrates a resistor-to-digital (R2D) converter for VSET-based output voltage selection, a dedicated STOP pin that halts switching instantly for noise-sensitive measurements, and thermal shutdown at 160°C with 5°C hysteresis. The device supports 1.51–2.9 µH inductors and 3–40 µF output capacitance, enabling stable regulation down to 1 µA load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| 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 without external regulators. |
| Max Output Current | 750 mA - sufficient for powering microcontrollers, BLE radios, and analog sensor front-ends simultaneously. |
| Quiescent Current (IQ) | 60 nA typical - enables >10-year battery life in always-on, low-duty-cycle applications like smart meters. |
| Switching Frequency | 1.8 MHz nominal - allows use of small 2.2 µH inductors and compact 4.7 µF/10 µF ceramic capacitors. |
| Output Voltage Accuracy | ±1.5% (VOUT ≥ 1.8 V) - ensures reliable logic-level compliance for 1.8 V/2.5 V/3.3 V digital subsystems. |
| Shutdown Current | 25 nA - minimizes leakage during deep sleep or system standby modes. |
| Thermal Shutdown | 160°C with 5°C hysteresis - protects against sustained overload or poor PCB thermal design in sealed enclosures. |
Pinout & Package
TPS62840DLCR uses the SON-8 (DLC) package: 1.5 mm × 2.0 mm, 0.5-mm pitch, thermally enhanced with exposed pad (EP) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 1.8–6.5 V; requires 4.7 µF ceramic capacitor placed adjacent to minimize input ripple and EMI. |
| GND | Ground reference | Common return for input/output capacitors and EP; must be low-impedance plane for thermal and noise performance. |
| SW | Switch node | Connects internal high-/low-side MOSFETs to inductor; sensitive to layout parasitics-keep trace short and direct. |
| VOS | Output voltage sense & discharge | Directly connects to output capacitor; enables automatic VOUT discharge when EN = GND for safe power-down. |
| VSET | Output voltage programming | Resistor-to-GND sets 16 discrete outputs (1.8–3.3 V); E96 series required; ≤100 pF parasitic capacitance critical. |
| EN | Enable control | Active-high; internal 450-kΩ pulldown prevents floating start-up; disconnects after regulation for precise sequencing. |
| STOP | Noise suppression control | Logic-high halts switching instantly-ideal for ADC sampling or RF transmit windows requiring zero switching noise. |
| MODE | Operating mode select | GND = auto PFM/PWM; VIN = forced PWM; enables dynamic trade-off between efficiency (PFM) and ripple (PWM). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 60 nA typical operating current extends battery life in multi-year deployments such as asset trackers. |
| 100% duty-cycle mode | 120-nA IQ at VIN = VOUT enables full regulation near battery end-of-life (e.g., 3.3 V → 3.3 V with depleted cell). |
| RF-friendly DCS-Control™ | Seamless PFM/PWM transition and <1% output ripple prevent interference with sub-GHz or 2.4 GHz wireless transceivers. |
| Output discharge function | Internal MOSFET sinks up to 44 mA through VOS pin, ensuring rapid, controlled VOUT decay during shutdown. |
| STOP pin for silent operation | Hardware-controlled switching halt eliminates conducted EMI during precision analog acquisition or RF calibration cycles. |
Applications
| Smart Meters | Wearable Electronics |
|---|---|
Use Scenario: Long-life, battery-operated utility meter with daily RF transmission and periodic sensor reads. IC Role / Device Role / Timing Role: Primary power regulator supplying MCU, real-time clock, metrology ADC, and NB-IoT transceiver. Use Value: 60-nA IQ enables >15-year battery life on primary lithium cells; STOP pin synchronizes clean power during metrology sampling. |
Use Scenario: Compact fitness band with optical heart-rate sensor, accelerometer, and BLE radio. IC Role / Device Role / Timing Role: Single-output buck converter powering 1.8-V sensor interface and 3.3-V BLE SoC from coin cell. Use Value: SON-8 footprint fits tight space constraints; 16 VOUT options simplify BOM across product variants; 1.8-MHz fSW avoids audible noise. |
| Medical Sensor Patches | Industrial IoT Sensors |
Use Scenario: Disposable patient monitor patch with ECG electrodes, temperature sensor, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Ultra-low-power supply enabling continuous 72-hour monitoring on single CR2032 cell. Use Value: 25-nA shutdown current preserves battery during shipping/storage; output discharge prevents residual voltage hazards before disposal. |
Use Scenario: Intrinsically safe gas detector in hazardous environments requiring ATEX certification. IC Role / Device Role / Timing Role: Safety-critical power stage for microcontroller, electrochemical sensor, and isolated RS-485 interface. Use Value: Thermal shutdown (160°C) and UVLO (1.72 V) ensure fail-safe behavior under fault conditions; robust 125°C junction rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62841DLCR | Fixed 0.8–1.55 V output range (50-mV steps); same IQ, package, and features. | Targets low-voltage MCUs (e.g., ARM Cortex-M0+) and core rails-not compatible with 1.8+ V I/O domains. | Select when powering sub-1.6 V logic; avoid if 1.8 V+ output required. |
| TPS62861DLCT | Higher 1-A output, 70-nA IQ, identical SON-8 package but no STOP pin or VSET programmability. | Suited for higher-current loads without need for noise-free measurement; lacks flexible voltage selection. | Choose for increased current headroom where STOP/VSET functionality is unnecessary. |
Compared with TPS62840DLCR, TPS62841DLCR provides lower output voltages for core rails but cannot support 1.8 V+ I/O, while TPS62861DLCT trades programmability and noise control for +250 mA output capability-making each suitable only for distinct system-level requirements.
Availability
TPS62840DLCR is available at Aetrix Electronics and suitable for smart meters, wearable electronics, and medical sensor patches requiring stable component supply across multi-year production cycles and extended battery life validation.
Supply support for TPS62840DLCR 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, low-power DC/DC conversion.
The TPS6284x family was engineered specifically for ultra-long-life battery applications in IoT edge nodes and medical wearables-prioritizing nanoscale quiescent current, RF-clean operation, and minimal external component count.
FAQ
What is the minimum input voltage required for TPS62840DLCR to regulate output?
The TPS62840DLCR has an undervoltage lockout (UVLO) threshold of 1.72 V (rising). Regulation begins once VIN exceeds this value. Below 1.45 V (falling threshold), the device shuts down. This ensures stable startup from partially discharged batteries while preventing erratic behavior near end-of-life.
How does the STOP pin affect output voltage stability in TPS62840DLCR?
When the STOP pin is driven high, the TPS62840DLCR immediately halts switching and sustains VOUT solely from stored energy in the output capacitor. Output voltage droop depends on load current and COUT value-e.g., with 10 µF and 100 µA load, droop is ~1 mV/ms. No regulation occurs during STOP mode.
Can TPS62840DLCR be used with ceramic output capacitors smaller than 10 µF?
Yes-the TPS62840DLCR is specified for 3–40 µF output capacitance. A 4.7 µF X7R ceramic capacitor meets minimum requirements and maintains stability with its low ESR. However, using <10 µF reduces hold-up time during STOP mode and increases output ripple under dynamic loads.
What is the maximum allowable parasitic capacitance on the VSET pin of TPS62840DLCR?
The TPS62840DLCR requires ≤100 pF total parasitic capacitance between VSET and GND. Exceeding this causes erroneous R2D conversion, resulting in incorrect output voltage. Layout best practices include avoiding vias or long traces near VSET and shielding it from noisy signals like SW or CLK.
Does TPS62840DLCR support forced PWM mode, and how is it enabled?
Yes-TPS62840DLCR supports forced PWM mode via the MODE pin. Driving MODE to VIN (high) disables automatic PFM/PWM transition and locks the converter in constant-frequency PWM operation, reducing output voltage ripple at the cost of higher light-load IQ (3 mA typical vs. 60 nA in PFM).
TPS62840DLCR 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 3.3V
- 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)
TPS62840DLCR FAQ
1.How can I place an order for TPS62840DLCR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62840DLCR 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 TPS62840DLCR reliable?
The price and inventory of TPS62840DLCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62840DLCR is usually 5 days.
3.What payment methods are accepted for TPS62840DLCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62840DLCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62840DLCR?
TPS62840DLCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62840DLCR 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 TPS62840DLCR?
For technical support, including TPS62840DLCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62840DLCR requirements.
6.How does Aetrix verify that TPS62840DLCR is sourced from the original manufacturer or authorized distributors?
All TPS62840DLCR 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 TPS62840DLCR meets industry standards.
7.What is the process for return or replacement of TPS62840DLCR?
All TPS62840DLCR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62840DLCR, 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 TPS62840DLCR part is unused and in its original packaging.
Return procedure for TPS62840DLCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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