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Texas Instruments TPS62120DCNT
- Part No.:
- TPS62120DCNT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-8
- Datasheet:
-
TPS62120DCNT.pdf
- Description:
- IC REG BUCK ADJ 75MA SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
TPS62120 from Texas Instruments is a synchronous step-down DC-DC converter optimized for ultra-low-power applications, supporting 2 V to 15 V input, 1.2 V to 5.5 V adjustable output, up to 75 mA load, 96% peak efficiency, and 11 µA quiescent current in power-save mode - deployed in energy harvesting nodes and low-power RF subsystems.
For engineers reviewing the TPS62120 datasheet, TPS62120 pinout, TPS62120 application, or TPS62120 equivalent, this page delivers verified electrical parameters, SOT-23-8 package mapping, functional pin roles, real-world use cases, and two validated alternative parts with documented technical and application-level differences.
Technical Context
The TPS62120 employs a hysteretic PFM/PWM hybrid control scheme: at light loads it operates in pulse frequency modulation (PFM) with ~10 µA quiescent current and single-pulse sleep cycles; above ~37.5 mA it transitions to quasi-fixed-frequency PWM mode with up to 800 kHz switching. Its internal 0.8 V reference and feedback comparator enable precise output regulation across input and load variations.
It integrates dual open-drain outputs - PG (power good, 95% rising/90% falling threshold) and SGND (discharge path with 370 Ω RDS(ON)) - both active during shutdown or UVLO. The device supports 100% duty cycle operation for lowest dropout and includes thermal shutdown at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2 V to 15 V - enables direct compatibility with single Li-ion, multi-cell alkaline, and industrial 9–12 V rails without pre-regulation. |
| Output Current | Up to 75 mA - sufficient for powering ultra-low-power MCUs (e.g., MSP430), RF transceivers (e.g., CC2652), and sensor signal chains. |
| Quiescent Current | 11 µA typical in PFM mode - extends battery life in always-on, intermittent-sensing applications like wireless sensor nodes. |
| Switching Frequency | Up to 800 kHz - allows use of compact 22 µH inductors (e.g., LQH3NPN) and 4.7 µF ceramic output capacitors. |
| Efficiency Peak | 96% at 5.5 VIN/1.8 VOUT/10 mA - minimizes thermal rise in sealed enclosures and preserves harvested energy. |
| UVLO Threshold | 2.5 V (rising), 1.85 V (falling) - prevents erratic startup from weak energy harvesters or depleted batteries. |
| Power Good Output | Open-drain PG with 2 µs delay and 500 µA sink capability - provides reliable system reset signaling for microcontrollers. |
Pinout & Package
SOT-23-8 package (2.90 mm × 1.63 mm body size) with exposed pad not present; thermal resistance RθJA = 259.7 °C/W; suitable for space-constrained PCB layouts with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 2–15 V; must be decoupled with ≥4.7 µF ceramic capacitor close to pin. |
| GND | Power ground reference | Main return path for input/output currents; connects to PCB ground plane. |
| VOUT | Regulated output node | Connects directly to output capacitor (4.7 µF typical); feeds downstream circuitry. |
| SW | Internal switch node | Drives external inductor; requires tight layout to minimize EMI and voltage spikes. |
| EN | Enable control input | Active-high logic; must be terminated (not floating); 0.8–1.1 V threshold ensures noise immunity. |
| FB | Feedback voltage sense | Monitors resistor divider output; referenced to internal 0.8 V bandgap; sets VOUT = 0.8 × (1 + R1/R2). |
| PG | Power good open-drain | Asserts low when VFB < 90% of target; requires external pullup (≤100 kΩ) to rail ≤5.5 V. |
| SGND | Discharge switch terminal | Internally connects to GND during shutdown; discharges VOUT capacitor when tied to output node. |
Key Features
| Feature | Design Value |
|---|---|
| Power Save Mode | Maintains ≤11 µA IQ across full load range via automatic PFM/PWM transition - critical for multi-year battery life. |
| Synchronous Rectification | Integrated high- and low-side MOSFETs eliminate external diode - reduces BOM count and improves light-load efficiency. |
| 100% Duty Cycle Operation | Enables regulation down to VIN – VOUT ≈ 100 mV at light loads - maximizes usable voltage from fading energy sources. |
| Internal Soft Start | Ramps VOUT at ~15 mV/µs (170 µs to 1.8 V) - prevents inrush current and input rail collapse on weak supplies. |
| Output Discharge Path | SGND pin provides controlled 370 Ω discharge path during shutdown - eliminates residual VOUT hold-up in safety-critical resets. |
Applications
| Wireless Sensor Node | Energy Harvesting System |
|---|---|
Use Scenario: Battery- or vibration-harvested power supplies feeding sub-100 µA MCU sleep states and burst-mode RF transmission. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvester output (2–12 V) to stable 1.8 V or 3.3 V for MCU and radio. Use Value: 11 µA quiescent current and PFM operation preserve microwatt-level harvested energy; 2 V startup enables operation from weak transducers. |
Use Scenario: Solar or thermal energy harvester powering an analog front-end and ADC in remote environmental monitoring. IC Role / Device Role / Timing Role: Efficient buck converter stepping down irregular, low-current harvester output to precise 2.5 V reference rail. Use Value: 96% peak efficiency and 100% duty cycle extend operational uptime under low-light or low-delta-T conditions. |
| Low-Power RF Transceiver | Industrial Process Sensor |
Use Scenario: CC2652R or nRF52840-based BLE module requiring clean, low-noise 3.0 V supply during TX bursts and deep-sleep modes. IC Role / Device Role / Timing Role: Low-ripple synchronous buck supplying regulated VDD while rejecting switching noise via PFM-controlled low-frequency pulses. Use Value: Low output ripple in PFM mode and integrated soft start prevent RF desense and ensure reliable packet transmission. |
Use Scenario: 4–20 mA loop-powered temperature or pressure transmitter with isolated microcontroller and analog signal chain. IC Role / Device Role / Timing Role: Secondary regulator deriving 1.8 V digital core voltage from loop-derived 3.3 V or 5 V rail. Use Value: Wide 2–15 V input accommodates varying loop compliance voltages; PG output synchronizes firmware initialization with rail stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8 V output; 300 mA rating; 17 µA IQ; 2-mm × 2-mm WSON-6 package | Lacks PG and SGND pins; no adjustable output; higher IQ limits ultra-low-power use | Select when fixed 1.8 V and higher current are required, and discharge/PG functions are unnecessary. |
| MAX17222ETA+ | 1.8 V fixed output; 400 mA rating; 300 nA IQ; 2-mm × 2-mm TDFN-6 package | No PG or discharge functionality; lower IQ but no adjustable VOUT or wide VIN support | Choose for nanowatt standby in always-on sensors where output voltage is fixed and 2–5.5 V input suffices. |
Compared with TPS62120, TPS62231DRYR offers higher current and smaller footprint but sacrifices adjustability and system-monitoring features; MAX17222ETA+ achieves ultra-low IQ yet lacks the input voltage range, PG signaling, and discharge capability essential for energy harvesting and safe shutdown.
Availability
TPS62120 is available at Aetrix Electronics and suitable for wireless sensor nodes, energy harvesting systems, low-power RF transceivers, and industrial process sensors requiring stable component supply across long-lifecycle deployments.
Supply support for TPS62120 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS6212x product line was designed specifically for ultra-low-power, wide-input-voltage DC-DC conversion in energy-constrained environments - emphasizing minimal quiescent current, flexible output adjustment, and integrated system-level functions like power good and output discharge.
FAQ
What is the minimum input voltage required for TPS62120 to start switching?
The TPS62120 requires a rising input voltage of at least 2.5 V to trip the undervoltage lockout (UVLO) threshold and initiate switching. Once enabled, it remains operational down to 1.85 V (falling UVLO threshold). Startup time from EN assertion to first switching pulse is typically 50 µs, and the device supports start-up into a pre-biased output capacitor.
Does TPS62120 support adjustable output voltage, and how is it set?
Yes, TPS62120 supports adjustable output voltage from 1.2 V to 5.5 V using an external resistor divider on the FB pin. The output is calculated as VOUT = 0.8 V × (1 + R1/R2), where R2 is recommended between 82 kΩ and 360 kΩ. An external feedforward capacitor (Cff ≈ 22 pF) is required for optimal transient response and loop stability.
What is the function of the SGND pin on TPS62120, and how should it be used?
The SGND pin on TPS62120 is an NMOS open-drain output with 370 Ω typical RDS(ON). During shutdown or UVLO, it connects internally to GND to discharge the output capacitor when tied to VOUT. When enabled and VIN is above UVLO, SGND is high-impedance. It must not be shorted to GND in normal operation, as that would disable discharge functionality.
How does TPS62120 achieve high efficiency at light loads?
TPS62120 achieves high light-load efficiency by entering pulse frequency modulation (PFM) mode, where it delivers single switching pulses followed by extended sleep periods. During sleep, most internal circuitry shuts down, reducing quiescent current to 11 µA typical. This preserves energy in battery- or harvester-powered systems where average load current is well below 75 mA.
Is TPS62120 pin-compatible with TPS62122, and what are the key differences?
No, TPS62120 (SOT-23-8) and TPS62122 (DFN-6) are not pin-compatible due to different package types and pin counts. TPS62120 includes PG and SGND pins for power-good signaling and output discharge; TPS62122 omits both. Additionally, TPS62120 supports wider thermal performance (RθJA = 259.7 °C/W vs. 114.4 °C/W for TPS62122) but requires more PCB area.
TPS62120DCNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- 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):
- 2V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 75mA
- Frequency - Switching:
- Up to 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
TPS62120DCNT FAQ
1.How can I place an order for TPS62120DCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62120DCNT 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 TPS62120DCNT reliable?
The price and inventory of TPS62120DCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62120DCNT is usually 5 days.
3.What payment methods are accepted for TPS62120DCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62120DCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62120DCNT?
TPS62120DCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62120DCNT 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 TPS62120DCNT?
For technical support, including TPS62120DCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62120DCNT requirements.
6.How does Aetrix verify that TPS62120DCNT is sourced from the original manufacturer or authorized distributors?
All TPS62120DCNT 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 TPS62120DCNT meets industry standards.
7.What is the process for return or replacement of TPS62120DCNT?
All TPS62120DCNT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62120DCNT, 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 TPS62120DCNT part is unused and in its original packaging.
Return procedure for TPS62120DCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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