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Texas Instruments TPS61322DBZR
- Part No.:
- TPS61322DBZR
- Manufacturer:
- Texas Instruments
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TPS61322DBZR.pdf
- Description:
- IC REG BOOST 2.2V 1.2A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
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Product details
Overview
TPS61322DBZR from Texas Instruments is a synchronous boost converter IC designed for ultra-low-power battery-powered systems. It operates from 0.9 V to 5.5 V input, delivers fixed 2.2 V output with ±3% accuracy, draws only 6.5 µA quiescent current into VOUT, and features 0.75 A peak switch current limit in its DBZ (3-pin SOT-23) package - enabling long-life operation in single-cell alkaline/NiMH devices such as wireless mice and portable medical sensors.
For engineers reviewing the TPS61322DBZR datasheet, TPS61322DBZR pinout, TPS61322DBZR application, or TPS61322DBZR equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency data at light loads, thermal shutdown behavior, and validated alternative options for low-IQ boost conversion where input voltage may drop below 1 V after startup.
Technical Context
The TPS61322DBZR uses a hysteretic current-mode control topology with synchronous rectification to maximize efficiency at microamp-level quiescent current. Its internal error amplifier regulates output voltage by maintaining a fixed 200 mA inductor ripple and dynamically adjusting current offset based on load demand.
It supports discontinuous conduction mode (DCM) under light loads to sustain >90% efficiency at 10 mA (1.5 V → 2.2 V), includes undervoltage lockout (UVLO) with 0.4 V turn-on threshold and 100 mV hysteresis, and integrates thermal shutdown at 150 °C with 20 °C hysteresis - all implemented in a 2.9 mm × 1.3 mm SOT-23-3 package with GND/SW/VOUT terminals only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9 V to 5.5 V - supports full discharge of 1-cell alkaline/NiMH (down to 0.4 V post-startup) |
| Output Voltage | Fixed 2.2 V ±3% - eliminates external feedback resistors; optimized for 2.2 V rail in portable sensors |
| Quiescent Current | 6.5 µA into VOUT - enables multi-year battery life in always-on applications drawing <100 µA average |
| Peak Switch Current Limit | 0.5 A to 0.75 A - sets maximum deliverable output current (e.g., ~114 mA at 0.9 V → 2.2 V, 70% eff.) |
| Efficiency @ 10 mA | >90% at 1.5 V → 2.2 V - reduces thermal stress and extends runtime in low-duty-cycle IoT endpoints |
| Thermal Shutdown | 150 °C activation with 20 °C hysteresis - protects silicon during sustained high-current or poor PCB thermal design |
| Package | SOT-23-3 (DBZ), 2.9 mm × 1.3 mm - compatible with standard pick-and-place; no NC pins |
Pinout & Package
SOT-23-3 (DBZ) package: 2.9 mm × 1.3 mm body, single-row 3-pin surface-mount, no exposed pad, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power ground reference | Primary return path for SW switching current and internal bias; must connect to low-impedance PCB ground plane |
| SW | Switch node | Connects to inductor; carries pulsed high-side FET current; requires short, low-inductance trace to minimize EMI and voltage spikes |
| VOUT | Regulated output | Delivers fixed 2.2 V; connects directly to output capacitor and load; supplies internal reference and error amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic current-mode control | Eliminates external compensation; maintains stable regulation across 0.9–5.5 V input without loop instability |
| Synchronous rectification | Reduces conduction loss vs. diode-based boosters; enables >90% efficiency at 10 mA with minimal BOM |
| Ultra-low 6.5 µA IQ | Extends shelf life and operational lifetime in battery-gauged devices; supports years of standby in remote sensors |
| Integrated UVLO & thermal protection | Prevents damage during brownout or overheating; auto-recovery after cooldown avoids system latch-up |
| Fixed 2.2 V output | Requires only inductor and output capacitor - no feedback divider needed; simplifies layout and reduces component count |
Applications
| Wireless Input Devices | Portable Medical Sensors |
|---|---|
|
Use Scenario: Wireless optical mouse powered by single AA alkaline cell, operating intermittently with deep sleep between motion events. IC Role / Device Role / Timing Role: Primary power regulator converting decaying 1.6 V → 0.9 V battery voltage to stable 2.2 V supply for MCU and RF transceiver. Use Value: 6.5 µA quiescent current enables >2-year battery life; hysteretic control ensures fast wake-up response without soft-start delay. |
Use Scenario: Handheld pulse oximeter using NiMH rechargeable cell, requiring precise analog front-end biasing and low-noise digital logic supply. IC Role / Device Role / Timing Role: Always-on DC/DC converter delivering clean 2.2 V rail to ADC reference and sensor interface circuitry. Use Value: ±3% output accuracy ensures consistent analog measurement; >90% efficiency at 10 mA minimizes self-heating near sensitive optics. |
| Gaming Peripherals | Low-Power IoT Endpoints |
|
Use Scenario: Bluetooth gaming controller with RGB LED feedback, powered by two AAA alkaline cells in series. IC Role / Device Role / Timing Role: Boost converter supplying regulated 2.2 V to microcontroller and BLE SoC during active gameplay and idle polling. Use Value: 0.75 A peak current supports brief LED bursts without output sag; SOT-23-3 footprint saves space on compact PCBs. |
Use Scenario: Battery-operated environmental sensor node (temperature/humidity) transmitting data every 5 minutes via sub-GHz radio. IC Role / Device Role / Timing Role: Core power management IC enabling ultra-deep sleep between transmissions while maintaining RTC and sensor bias. Use Value: Operation down to 0.4 V input extends usable battery range; thermal shutdown prevents failure during enclosure temperature rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS613221ADBVR | Fixed 3.3 V output; 1.2 A peak switch current limit; same DBV (5-pin SOT-23) package | Targets higher-voltage logic rails (e.g., 3.3 V MCU peripherals); requires different output capacitor ESR tuning | Select when system needs 3.3 V output and can accommodate 5-pin layout; not pin-compatible with DBZ |
| TPS61291DRVR | 0.95 µA IQ; 0.5 A switch limit; 2.2 V fixed output; WSON-6 package (2.0 mm × 2.0 mm) | Better suited for extreme ultra-low-power designs (<1 µA sleep); smaller footprint but requires thermal pad layout | Choose for longest possible battery life where PCB area allows WSON-6; differs in package, thermal performance, and pinout |
Compared with TPS61322DBZR, TPS613221ADBVR offers higher output voltage and current but requires 5-pin routing and lacks SOT-23-3 compatibility, while TPS61291DRVR achieves significantly lower quiescent current in a different package - making TPS61322DBZR optimal for cost-sensitive, space-constrained 2.2 V boost applications with moderate current demands.
Availability
TPS61322DBZR is available at Aetrix Electronics and suitable for wireless input devices, portable medical sensors, gaming peripherals, and low-power IoT endpoints requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TPS61322DBZR 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-efficiency DC/DC conversion.
The TPS61322 family was engineered specifically for ultra-low-quiescent-current boost conversion in single-cell battery systems - prioritizing longevity, simplicity, and reliability over programmability or wide output adjustability.
FAQ
What is the exact output voltage of the TPS61322DBZR?
The TPS61322DBZR has a factory-trimmed fixed output voltage of 2.2 V with ±3% accuracy across –40°C to +125°C junction temperature. This value is internally set and requires no external resistors - confirmed in Section 6.5 Electrical Characteristics of the SLVSDY5E datasheet, where VOUT is specified as 2.134 V (min) to 2.266 V (max) under full operating conditions.
Does the TPS61322DBZR support input voltages below 1 V?
Yes - the TPS61322DBZR starts up at minimum VIN = 0.9 V and continues operating down to 0.4 V after startup is complete, as stated in Section 7.1 Overview and Table 6-1. This enables full utilization of alkaline/NiMH cell discharge curves, extending usable battery capacity beyond conventional 1.0 V cutoffs.
What is the peak switch current limit for the TPS61322DBZR?
The TPS61322DBZR has a typical peak switch current limit of 0.75 A, with a minimum of 0.5 A and maximum of 1.2 A across temperature and process variation (Section 6.5, ILIM parameter). This limit defines the maximum instantaneous inductor current and constrains achievable output current depending on input/output voltage ratio and efficiency.
Can the TPS61322DBZR be used with an external Schottky diode?
No - the TPS61322DBZR (DBZ package) does not support external Schottky diode enhancement. That capability is exclusive to variants like TPS613222A (5-pin DBV package) which include dedicated pins for external diode connection. The DBZ version has only GND/SW/VOUT pins and relies solely on internal synchronous rectification.
What package type is used by the TPS61322DBZR?
The TPS61322DBZR uses the SOT-23-3 (DBZ) package: a 2.9 mm × 1.3 mm body with three terminals (GND, SW, VOUT), no NC pins, and standard gull-wing leads. This is explicitly documented in the Device Information table and Pin Configuration section (Figure 5-1) of the SLVSDY5E datasheet.
TPS61322DBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 500kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TPS61322DBZR FAQ
1.How can I place an order for TPS61322DBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61322DBZR 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 TPS61322DBZR reliable?
The price and inventory of TPS61322DBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61322DBZR is usually 5 days.
3.What payment methods are accepted for TPS61322DBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61322DBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61322DBZR?
TPS61322DBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61322DBZR 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 TPS61322DBZR?
For technical support, including TPS61322DBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61322DBZR requirements.
6.How does Aetrix verify that TPS61322DBZR is sourced from the original manufacturer or authorized distributors?
All TPS61322DBZR 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 TPS61322DBZR meets industry standards.
7.What is the process for return or replacement of TPS61322DBZR?
All TPS61322DBZR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61322DBZR, 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 TPS61322DBZR part is unused and in its original packaging.
Return procedure for TPS61322DBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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