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Texas Instruments TPS61220DCKT
- Part No.:
- TPS61220DCKT
- Manufacturer:
- Texas Instruments
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TPS61220DCKT.pdf
- Description:
- IC REG BOOST ADJ 200MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
TPS61220DCKT from Texas Instruments is an adjustable-output synchronous boost converter IC designed for ultra-low-input-voltage battery-powered systems. It operates from 0.7 V to 5.5 V input, delivers 1.8 V to 6.0 V output, achieves up to 95% efficiency at typical loads, maintains 5.5 µA quiescent current, and supports startup into load at 0.7 V - enabling use in single-cell alkaline/NiMH or Li-ion applications such as portable medical sensors and LED biasing.
For engineers reviewing the TPS61220DCKT datasheet, TPS61220DCKT pinout, TPS61220DCKT application, or TPS61220DCKT equivalent, key selection criteria include its hysteretic current-mode control architecture, 200 mA minimum switch current limit, SC-70 (6-pin) package footprint, feedback voltage of 500 mV, and pass-through behavior during shutdown - all critical for low-power, space-constrained DC/DC designs.
Technical Context
The TPS61220DCKT implements a self-oscillating hysteretic current-mode controller that regulates output voltage by maintaining constant inductor ripple current (200 mA typ.) and dynamically adjusting its offset based on load. Its synchronous rectification uses two actively controlled MOSFETs with RDS(on) of 600–700 mΩ (main switch) and 700–1000 mΩ (rectifying switch), enabling high efficiency without external compensation.
Startup begins via internal oscillator when VIN < 1.8 V, limiting switch current until control circuitry is powered; normal operation resumes once VOUT reaches ~1.8 V. Protection features include undervoltage lockout (0.7 V threshold), overvoltage protection (6.0 V trip), overtemperature shutdown (140 °C), and thermal hysteresis (20 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7 V to 5.5 V - enables direct operation from single-cell alkaline (0.7 V cutoff), NiMH, or Li-ion batteries without pre-regulation. |
| Output Voltage Range | 1.8 V to 6.0 V (adjustable via external resistor divider) - supports wide system rail requirements including 3.3 V microcontrollers and 5 V peripherals. |
| Quiescent Current | 5.5 µA - minimizes battery drain in always-on sensor nodes and standby modes. |
| Switch Current Limit | 200 mA minimum - defines maximum inductor peak current, constraining output capability under low-VIN conditions. |
| Feedback Reference Voltage | 500 mV (typ.) - sets precision for external resistor-divider programming; enables accurate output regulation across temperature. |
| Efficiency | Up to 95% at typical operating conditions - achieved via synchronous rectification and hysteretic control, reducing switching and conduction losses. |
| Shutdown Current | 0.2–0.5 µA - ensures near-zero battery leakage when disabled, critical for long-life battery applications. |
Pinout & Package
The TPS61220DCKT is housed in a 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for minimal PCB area in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 0.7–5.5 V source; connects to inductor L and internal main switch; must be decoupled with ≥10 µF ceramic capacitor. |
| L | Inductor connection node | Drives external 4.7 µH inductor; carries switched current; requires low-ESR layout to minimize ringing and EMI. |
| GND | Power and logic ground reference | Common return path for input/output currents and control circuitry; must be low-impedance and thermally coupled to PCB copper. |
| VOUT | Regulated output voltage node | Delivers 1.8–6.0 V; supplies load and feedback network; requires ≥10 µF output capacitance for stability and ripple suppression. |
| FB | Feedback input for output voltage sensing | Monitors VOUT via external resistor divider; compares to 500 mV internal reference to regulate output; open only in fixed-voltage variants. |
| EN | Enable/disable control input | Active-high digital control (VIH = 0.8×VIN or 1.2 V); must be driven - not left floating; enables pass-through mode when low. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic current-mode control | Enables stable, compensation-free operation with fast transient response and compatibility with wide-range inductors/capacitors. |
| Synchronous rectification | Reduces conduction losses using integrated low-RDS(on) MOSFETs - no external Schottky diode required. |
| Startup at 0.7 V input | Allows immediate operation from deeply discharged single-cell batteries, extending usable battery life. |
| Pass-through function during shutdown | Permits VIN to appear at VOUT through body diode of rectifying switch - useful for backup power paths or brownout holdup. |
| Integrated protections | Includes undervoltage lockout (0.7 V), overvoltage clamp (6.0 V), overtemperature shutdown (140 °C), and thermal hysteresis (20 °C). |
Applications
| Portable Medical Sensors | Low-Power LED Biasing |
|---|---|
|
Use Scenario: Powering optical pulse oximeter sensors or glucose meter front-ends from a single AA alkaline cell. IC Role / Device Role / Timing Role: Adjustable boost converter generating stable 3.3 V rail for analog front-end and MCU, operating down to 0.7 V battery voltage. Use Value: 5.5 µA quiescent current extends battery life beyond 1 year in intermittent-use devices; 95% efficiency preserves runtime during active measurement cycles. |
Use Scenario: Driving white status LEDs in handheld test equipment with variable brightness control. IC Role / Device Role / Timing Role: Configured for 5.0 V output to bias multiple parallel LEDs; EN pin used for PWM dimming synchronization. Use Value: Pass-through mode during shutdown allows LED fade-out via RC decay; 200 mA switch current supports >30 mA LED strings without external driver. |
| Consumer Wearables | Energy-Harvesting Systems |
|
Use Scenario: Supplying 1.8 V core voltage to ultra-low-power BLE SoCs in fitness trackers powered by coin cells. IC Role / Device Role / Timing Role: Synchronous boost regulator with 500 mV FB reference enabling precise low-voltage rail generation and tight load regulation. Use Value: SC-70 package (2.0 × 1.25 mm) fits within tight board area constraints; discontinuous current mode maintains >80% efficiency at µA-level loads. |
Use Scenario: Stepping up output from solar cells or thermoelectric generators (0.8–2.5 V) to charge supercapacitors or power wireless transmitters. IC Role / Device Role / Timing Role: Input-startup capability at 0.7 V enables harvesting from weak light or low ΔT sources; adjustable output matches storage element voltage profile. Use Value: 0.2–0.5 µA shutdown current prevents energy loss during dark/low-power periods; hysteretic control tolerates wide input impedance variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61221DCKT | Fixed 3.3 V output; identical package, quiescent current, and protection features. | Eliminates external feedback resistors but lacks output flexibility; suited for systems requiring only 3.3 V. | Select when output voltage is fixed and board space for resistors must be minimized. |
| TPS61291DRVR | Lower 300 nA quiescent current; 0.65 V min input; WSON-6 (2.0 × 2.0 mm) package; no pass-through mode. | Better for multi-year battery life in IoT endpoints; incompatible pinout and shutdown behavior. | Choose for ultra-low-IQ applications where pass-through is unnecessary and layout allows WSON-6 footprint. |
Compared with TPS61221DCKT, the TPS61220DCKT offers design flexibility via adjustable output but requires two external resistors; compared with TPS61291DRVR, it trades ultra-low quiescent current for pass-through functionality and broader input compatibility - making it optimal for cost-sensitive, battery-flexible portable systems.
Availability
TPS61220DCKT is available at Aetrix Electronics and suitable for portable medical sensors, low-power LED biasing, consumer wearables, energy-harvesting systems, and battery-backed instrumentation requiring stable component supply and long-term manufacturability.
Supply support for TPS61220DCKT 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 and embedded processing technologies, with decades of expertise in power management ICs for battery-operated and industrial applications.
The TPS6122x product line was engineered specifically for ultra-low-input-voltage boost conversion in space-constrained, single-cell battery systems - prioritizing quiescent current, startup capability, and integration over high-current output.
FAQ
What is the minimum input voltage required for TPS61220DCKT to start up and regulate?
The TPS61220DCKT starts up and regulates output voltage at a minimum input voltage of 0.7 V, even into load - verified across temperature and with RLOAD ≥150 Ω. This enables operation from deeply discharged single-cell alkaline, NiMH, or Li-ion batteries before conventional boost converters cease functioning. The startup oscillator activates below ~1.8 V to safely ramp output.
Does TPS61220DCKT support adjustable output voltage, and how is it configured?
Yes, the TPS61220DCKT is the adjustable version of the TPS6122x family. Output voltage is set using an external resistor divider between VOUT and GND, with the FB pin connected to the divider midpoint. The internal reference is 500 mV, so VOUT = 500 mV × (1 + R1/R2). This allows precise configuration from 1.8 V to 6.0 V without changing the IC.
What happens to the output when TPS61220DCKT is disabled via the EN pin?
When the EN pin is driven low, the TPS61220DCKT enters shutdown mode: switching stops, control circuitry powers down, and quiescent current drops to 0.2–0.5 µA. However, the body diode of the internal rectifying MOSFET remains forward-biased, allowing VIN to pass through to VOUT - resulting in a diode-drop-limited output voltage (≈ VIN − 0.3 V).
What protection features are integrated into the TPS61220DCKT?
The TPS61220DCKT integrates four key protections: undervoltage lockout (UVLO) triggers at 0.7 V input to prevent malfunction; overvoltage protection clamps output at 6.0 V; overtemperature shutdown activates at 140 °C junction temperature with 20 °C hysteresis; and internal switch current limiting prevents destructive inductor saturation during overload.
Can the TPS61220DCKT operate in discontinuous conduction mode (DCM), and why does it matter?
Yes, the TPS61220DCKT automatically transitions to discontinuous conduction mode (DCM) under light loads - when average input current falls below the 200 mA inductor ripple current. This preserves high efficiency (<80%) at µA-level loads, critical for battery longevity in intermittently active devices like remote sensors or wearables.
TPS61220DCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 200mA (Switch)
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TPS61220DCKT FAQ
1.How can I place an order for TPS61220DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61220DCKT 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 TPS61220DCKT reliable?
The price and inventory of TPS61220DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61220DCKT is usually 5 days.
3.What payment methods are accepted for TPS61220DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61220DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61220DCKT?
TPS61220DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61220DCKT 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 TPS61220DCKT?
For technical support, including TPS61220DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61220DCKT requirements.
6.How does Aetrix verify that TPS61220DCKT is sourced from the original manufacturer or authorized distributors?
All TPS61220DCKT 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 TPS61220DCKT meets industry standards.
7.What is the process for return or replacement of TPS61220DCKT?
All TPS61220DCKT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61220DCKT, 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 TPS61220DCKT part is unused and in its original packaging.
Return procedure for TPS61220DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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