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Texas Instruments UCC39412PWTR
- Part No.:
- UCC39412PWTR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC39412PWTR.pdf
- Description:
- IC REG BOOST 3.3V 60MA 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,645
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Product details
Overview
UCC39412PWTR from Texas Instruments is a low-power synchronous boost converter IC optimized for single/dual alkaline battery operation, delivering 3.3 V at up to 200 mW output power with 1 V minimum start-up voltage, 0.5 Ω charge switch RDS(on), and integrated adaptive current mode control. It serves as the primary power management IC in ultra-low-voltage portable systems such as pagers and handheld medical sensors.
For engineers reviewing the UCC39412PWTR datasheet, UCC39412PWTR pinout, UCC39412PWTR application, or UCC39412PWTR equivalent, key selection criteria include its guaranteed 1 V start-up under full load, programmable reset timing via CT pin, dual-output capability (3.3 V main + 7 V gate-drive), and TSSOP-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The UCC39412PWTR implements a multiplexed, priority-based dual-output architecture where the 3.3 V main output takes precedence over the 7 V VGD supply unless VGD falls below 6.3 V. Its bang-bang control transitions between discontinuous and continuous conduction modes based on load demand, enabling high efficiency across 0.5–60 mA output current range.
It integrates synchronous rectification with 1.2 Ω RDS(on) rectifier, anti-cross-conduction logic, and adaptive current limit (385–715 mA peak) tied to inductor value (22 µH typical). The SD/FB pin functions solely as shutdown input - not feedback - simplifying interface with CMOS/TTL logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±3.3% (3.17–3.43 V) over 0–60 mA load and 1–3 V input |
| Start-up voltage | Guaranteed 1 V max under full 60 mA load; operates down to 0.5 V after startup |
| Max output power | 200 mW at battery voltages ≥0.8 V, enabled by 0.5 Ω charge switch and 1.2 Ω rectifier |
| Shutdown current | 6 µA typical, ensuring minimal battery drain during system sleep |
| VGD regulation | 7.0 V ±10% (6.3–7.7 V) for internal gate drive; supports external loads ≤10 mA |
| Reset threshold | 2.97 V nominal (2.85–3.09 V), corresponding to 90% of 3.3 V output for microcontroller reset |
| Reset period | Programmable via CT capacitor: tRP = C × 1.25 s (e.g., 0.15 µF → 188 ms) |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 0.5–3.2 V; powers IC during startup; connects to inductor and SW |
| SD/FB | Shutdown control | Active-low TTL/CMOS-compatible input; no feedback function in UCC39412 |
| RESB | Reset output | Open-drain active-low signal asserting when VOUT drops below 90% of 3.3 V |
| CT | Reset timer | Capacitor-to-ground sets reset timeout duration (tRP = C × 1.25 s) |
| VGD | Gate-drive supply | Internally regulated ~7 V output; powers internal switches; priority-limited to ≥6.3 V |
| VOUT | Main regulated output | Fixed 3.3 V output; highest priority in multiplexing scheme; supplies system load |
| SW | Switch node | Connects to inductor and flyback diode; driven low to charge inductor, then floats for energy transfer |
| GND | Power ground | Analog and power return; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive current mode control | Automatically selects discontinuous or continuous conduction to maximize efficiency across 0.5–60 mA load range |
| Synchronous rectification | Integrated 1.2 Ω RDS(on) rectifier eliminates Schottky losses, enabling >85% efficiency at light loads |
| Programmable reset timing | External CT capacitor sets reset hold-off period (e.g., 0.15 µF → 188 ms), ensuring stable MCU clock startup |
| Dual-output multiplexing | Single-inductor topology delivers both 3.3 V main output and 7 V VGD supply with dynamic priority arbitration |
| Ultra-low shutdown current | 6 µA typical draw in shutdown extends shelf life of battery-powered devices during storage |
Applications
| Pager Power Management | Handheld Medical Sensor |
|---|---|
Use Scenario: Battery-powered pager requiring reliable wake-up from deep sleep with instantaneous 3.3 V rail availability after button press. IC Role / Device Role / Timing Role: Primary boost converter providing regulated 3.3 V output and synchronized 7 V gate drive for RF front-end switches. Use Value: Guaranteed 1 V start-up ensures operation even with depleted alkaline cells; 6 µA shutdown current preserves battery for months in standby. | Use Scenario: Portable pulse oximeter powered by two AA cells, needing stable 3.3 V for ADC and microcontroller during intermittent 10-second measurement bursts. IC Role / Device Role / Timing Role: Synchronous boost regulator delivering 200 mW peak power while maintaining tight 3.3 V regulation across 0.8–3.2 V input range. Use Value: Adaptive current mode control sustains >80% efficiency from 1 mA to 60 mA load, extending battery life per measurement cycle. |
| Low-Power IoT Transmitter | Industrial Remote Sensor Node |
Use Scenario: Battery-operated LoRaWAN node transmitting sensor data every 15 minutes, requiring clean 3.3 V supply for radio and MCU during brief 200 ms transmit burst. IC Role / Device Role / Timing Role: High-efficiency boost converter with programmable reset (via CT) ensuring MCU resets cleanly before each transmission sequence. Use Value: RESB open-drain output asserts within 60 µs of VOUT falling below 3.0 V, preventing corrupted radio initialization. | Use Scenario: Harsh-environment temperature/humidity sensor deployed in remote industrial location, powered by two alkaline cells with 5-year expected lifetime. IC Role / Device Role / Timing Role: Primary power IC managing dual outputs: 3.3 V for digital logic and 7 V for analog front-end biasing and op-amp rails. Use Value: VGD regulation holds ≥6.3 V even as main battery depletes, preserving analog accuracy while main output remains stable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC29412PWTR | Same functionality but rated for –40°C to 85°C operating range vs. UCC39412PWTR's 0°C to 70°C | Required for extended-temperature industrial or automotive cabin applications | Select UCC29412PWTR if ambient temperature exceeds 70°C or requires industrial-grade qualification |
| TPS61200DRVR | Higher 3.3 V output current (up to 150 mA vs. 60 mA), lower 0.35 V start-up, but no auxiliary VGD output | Preferred for higher-current 3.3 V-only systems without gate-drive needs | Choose TPS61200DRVR when main output load exceeds 60 mA and auxiliary 7 V supply is unnecessary |
Compared with UCC29412PWTR and TPS61200DRVR, the UCC39412PWTR uniquely balances ultra-low-voltage start-up, integrated dual-output capability, and minimal quiescent current - making it optimal for cost-sensitive, space-constrained, single-cell alkaline applications where both 3.3 V logic and 7 V analog bias are required.
Availability
UCC39412PWTR is available at Aetrix Electronics and suitable for pager power management, handheld medical sensors, low-power IoT transmitters, and industrial remote sensor nodes requiring stable component supply across long production lifecycles.
Supply support for UCC39412PWTR 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 battery-efficient power conversion ICs.
The UCC39412PWTR belongs to TI's UCCx9411 family of low-input-voltage synchronous boost converters, designed specifically for single/dual alkaline cell-powered portable electronics demanding high efficiency from 0.5 V to 3.2 V input.
FAQ
What is the guaranteed minimum input voltage for UCC39412PWTR startup under full load?
The UCC39412PWTR guarantees startup at ≤1 V input voltage under full 60 mA load. Once operational, it continues functioning down to 0.5 V input. This ensures reliable power-up from deeply discharged alkaline cells, critical for long-life battery applications like pagers and remote sensors. The UCC39412PWTR achieves this via optimized low-voltage bias circuitry and adaptive current control.
Does UCC39412PWTR support adjustable output voltage via feedback resistors?
No, the UCC39412PWTR provides a fixed 3.3 V output and does not support external feedback adjustment. Its SD/FB pin serves only as an active-low shutdown input - unlike the UCC39411 variant, which uses SD/FB for voltage setting. For adjustable output, select UCC39411PWTR instead. The UCC39412PWTR's fixed regulation simplifies design and improves stability in dedicated 3.3 V applications.
How is the reset timeout period programmed on UCC39412PWTR?
The reset timeout period on UCC39412PWTR is set by an external capacitor connected from the CT pin to ground, using the formula tRP = C × 1.25 seconds (C in µF). For example, a 0.15 µF capacitor yields a nominal 188 ms reset hold-off. This allows precise alignment with microcontroller clock stabilization requirements. The UCC39412PWTR's RESB pin asserts low until this period expires after VOUT rises above 2.97 V.
What is the purpose of the VGD pin on UCC39412PWTR, and what load can it support?
The VGD pin on UCC39412PWTR provides a coarsely regulated ~7 V supply primarily for internal gate drive, but it can also power external circuitry up to 10 mA - provided the load does not draw below 2 V during startup. Its regulation range is 6.3–7.7 V. The UCC39412PWTR prioritizes VOUT over VGD unless VGD falls below 6.3 V, ensuring system logic remains powered first.
Can UCC39412PWTR operate with input voltages below 1 V after initial startup?
Yes, the UCC39412PWTR maintains operation down to 0.5 V input voltage once started - though startup itself requires ≤1 V under full load. This extended operating range maximizes usable battery capacity from alkaline cells, especially under light-load conditions where quiescent current (15–28 µA) dominates. The UCC39412PWTR's adaptive current control and low-RDS(on) switches enable stable regulation even near end-of-life battery voltage.
UCC39412PWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.1V
- Voltage - Input (Max):
- 3.2V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 60mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
UCC39412PWTR FAQ
1.How can I place an order for UCC39412PWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC39412PWTR 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 UCC39412PWTR reliable?
The price and inventory of UCC39412PWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC39412PWTR is usually 5 days.
3.What payment methods are accepted for UCC39412PWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC39412PWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC39412PWTR?
UCC39412PWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC39412PWTR 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 UCC39412PWTR?
For technical support, including UCC39412PWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC39412PWTR requirements.
6.How does Aetrix verify that UCC39412PWTR is sourced from the original manufacturer or authorized distributors?
All UCC39412PWTR 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 UCC39412PWTR meets industry standards.
7.What is the process for return or replacement of UCC39412PWTR?
All UCC39412PWTR units undergo pre-shipment inspection (PSI). If there is an issue with UCC39412PWTR, 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 UCC39412PWTR part is unused and in its original packaging.
Return procedure for UCC39412PWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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