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Texas Instruments UCC29412PW
- Part No.:
- UCC29412PW
- Manufacturer:
- Texas Instruments
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- -
- Datasheet:
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UCC29412PW.pdf
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Product details
Overview
UCC29412PW from Texas Instruments is a low-power synchronous boost converter IC optimized for single/dual alkaline battery operation (0.5 V–3.2 V input), delivering 3.3 V / 200 mW main output and a 7 V auxiliary gate-drive supply. It features adaptive current-mode control, programmable reset timing via CT pin, and full output disconnection in shutdown. Used in pagers, cell phones, and low-voltage portable electronics.
For engineers reviewing the UCC29412PW datasheet, UCC29412PW pinout, UCC29412PW application, or UCC29412PW equivalent, key selection criteria include its 0.5 V minimum operating voltage, 6 µA shutdown current, 3.3 V ±3% regulation accuracy, and TSSOP-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The UCC29412PW implements a multiplexed dual-output architecture that prioritizes VOUT over VGD unless VGD falls below 6.3 V, enabling efficient single-inductor generation of both 3.3 V main power and 7 V gate drive. Its bang-bang control transitions between discontinuous and continuous conduction modes based on load, optimizing efficiency across 0.1–60 mA output range.
Startup is guaranteed at 1 V input under full 60 mA load, and operation continues down to 0.5 V once running. The internal 0.5 Ω charge switch and 1.2 Ω synchronous rectifier, combined with anti-cross-conduction logic and glitch-suppressed reset, support high-efficiency conversion without external MOSFETs or diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 0.5 V to 3.2 V - enables operation from depleted alkaline/NiMH cells; start-up ensured at ≤1 V under full load |
| Main output voltage | 3.3 V ±3% - fixed regulated output; stable for powering 3.3 V microcontrollers and RF modules |
| Output power | 200 mW - sufficient for low-power wireless transceivers, sensors, and display drivers in portable devices |
| Shutdown supply current | 6 µA - minimizes battery drain during standby; critical for long shelf-life applications |
| VGD output voltage | 7.0 V ±10% - dedicated auxiliary supply for internal gate drive; supports integrated synchronous rectification |
| Reset threshold | 90% of VOUT (2.97 V) - active-low open-drain RESB signal triggers MCU reset during brownout |
| Reset period programming | CT capacitor sets delay (e.g., 0.15 µF → 188 ms) - ensures reliable processor initialization after power-up |
Pinout & Package
Packaged in an 8-pin TSSOP (PW), the UCC29412PW uses a compact 3.0 mm × 4.4 mm footprint with 0.65 mm lead pitch and 1.2 mm max height, suitable for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 0.5–3.2 V battery input; powers IC during startup before VOUT/VGD regulation |
| SD/FB | Shutdown control | Active-low shutdown pin; pulled low disables switching and reduces supply current to 6 µA |
| RESB | Reset output | Open-drain active-low signal asserting when VOUT drops below 90% of 3.3 V (2.97 V) |
| CT | Reset timer | Connects to ground via capacitor to set reset timeout duration (tRP = C × 1.25 s) |
| VGD | Auxiliary gate-drive supply | 7 V regulated output; powers internal synchronous rectifier driver; priority-limited to ≥6.3 V |
| VOUT | Main regulated output | 3.3 V fixed output; highest-priority rail; supplies system logic and peripherals |
| SW | Switch node | Connects to inductor and flyback diode; driven by internal 0.5 Ω charge switch and 1.2 Ω rectifier |
| GND | Power and signal reference | Common return for VIN, VOUT, VGD, and control circuitry; requires low-impedance PCB plane |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor dual-output topology | Eliminates need for separate VGD inductor or LDO; reduces BOM count and board area by ~30% vs discrete solutions |
| Adaptive current-mode control | Automatically shifts between discontinuous and continuous conduction to maintain >85% efficiency from 0.1 mA to 60 mA load |
| Programmable undervoltage reset | CT pin allows precise reset hold-off time (94–300 ms typical); prevents MCU lockup during battery ramp-up |
| Integrated synchronous rectification | On-chip 1.2 Ω rectifier replaces external Schottky diode, improving light-load efficiency by up to 12% at 1 mA |
| Anti-cross-conduction logic | Prevents shoot-through during SW switching transitions; eliminates need for external gate timing components |
Applications
| Pager Power Management | Low-Power Wireless Sensor Node |
|---|---|
Use Scenario: Alkaline-powered pager requiring reliable 3.3 V logic supply and clean reset during battery depletion. IC Role / Device Role / Timing Role: Primary DC-DC converter generating 3.3 V main rail and 7 V gate drive; RESB provides synchronized reset to baseband processor. Use Value: Enables full functionality down to 0.5 V battery voltage; 6 µA shutdown current extends operational life by >2× vs non-synchronous alternatives. | Use Scenario: Battery-operated environmental sensor transmitting periodic BLE packets with intermittent 3.3 V MCU and radio operation. IC Role / Device Role / Timing Role: System power manager delivering regulated 3.3 V and enabling fast wake-up/reset sequencing via CT-programmed RESB. Use Value: Adaptive conduction mode maintains >87% efficiency at 0.2 mA sleep current and 20 mA transmit peak, extending 2-cell AA battery life to >5 years. |
| Medical Glucose Meter | Industrial Handheld Scanner |
Use Scenario: Portable glucose meter using single alkaline cell, requiring accurate 3.3 V ADC reference and deterministic power-on reset. IC Role / Device Role / Timing Role: Precision boost regulator with tight 3.3 V ±3% output and glitch-filtered RESB output tied to MCU reset pin. Use Value: Fixed 3.3 V output eliminates need for external feedback resistors; programmable reset ensures ADC initialization completes before first measurement cycle. | Use Scenario: Rugged handheld barcode scanner powered by two AA cells, needing robust 3.3 V supply and ESD-tolerant interface pins. IC Role / Device Role / Timing Role: Main power IC providing 3.3 V for imaging sensor, FPGA, and interface logic; SD/FB enables host-controlled shutdown. Use Value: 1.2 Ω synchronous rectifier and 0.5 Ω switch minimize thermal rise in sealed enclosure; SOIC/TSSOP pinout supports automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-input-voltage boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC29412D | Same electrical specs but in SOIC-8 (5.0 mm × 6.2 mm); 1.75 mm height; higher thermal resistance (θJA ≈ 160°C/W vs 120°C/W for PW) | Better suited for through-hole prototyping or legacy SOIC footprints; less optimal for ultra-thin portable designs | Select UCC29412D only if board layout mandates SOIC or thermal derating above 40°C ambient is acceptable. |
| TPS61200DRCT | 0.3 V–5.5 V input; 3.3 V/250 mW output; 2.5 µA quiescent current; no auxiliary VGD rail; different pinout and control scheme | Lacks dual-rail capability and programmable reset; requires external reset IC or MCU GPIO monitoring for brownout detection | Choose TPS61200DRCT when minimal quiescent current is paramount and auxiliary 7 V supply is unnecessary. |
Compared with UCC29412D and TPS61200DRCT, the UCC29412PW uniquely integrates a dedicated 7 V gate-drive rail and programmable reset in a space-optimized TSSOP package-making it the only option supporting true single-inductor dual-output operation with built-in brownout protection for alkaline-powered portable systems.
Availability
UCC29412PW is available at Aetrix Electronics and suitable for pager power management, low-power wireless sensor nodes, medical glucose meters, and industrial handheld scanners requiring stable component supply across extended production lifecycles.
Supply support for UCC29412PW 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-powered portable electronics.
The UCC29412PW belongs to TI's UCCx9411 family of low-input-voltage synchronous boost converters, designed specifically for maximizing runtime in single/dual-cell alkaline, NiCd, and NiMH applications where ultra-low start-up voltage and integrated auxiliary supply are critical.
FAQ
What is the minimum input voltage required for UCC29412PW to start up under full load?
The UCC29412PW guarantees startup at ≤1.0 V input voltage under full 60 mA load. Once operating, it continues regulation down to 0.5 V input. This ensures reliable power-up from deeply discharged alkaline or NiMH cells, a key requirement for long-life portable devices. The UCC29412PW achieves this via optimized start-up circuitry and low-quiescent-current biasing.
How does the UCC29412PW generate both 3.3 V and 7 V outputs from a single inductor?
The UCC29412PW uses time-multiplexed energy transfer: during each switching cycle, inductor energy is directed either to the VOUT rail (3.3 V) or the VGD rail (7 V), based on real-time voltage monitoring and priority logic. VOUT has highest priority unless VGD falls below 6.3 V. This eliminates the need for a second inductor or transformer while maintaining regulation on both rails. The UCC29412PW implements this with internal synchronous switches and flyback diode routing.
Can the UCC29412PW's reset function be disabled or bypassed?
No, the UCC29412PW's RESB output is not disableable-it asserts active-low whenever VOUT falls below 90% of nominal (2.97 V). However, the reset period is fully programmable via the CT capacitor (e.g., 0.1 µF yields ~125 ms). To suppress reset assertion, the host system must maintain VOUT ≥2.97 V; floating or pulling up RESB is not recommended as it is an open-drain output designed for direct MCU reset pin connection. The UCC29412PW does not provide an internal disable mechanism.
What is the purpose of the SD/FB pin on the UCC29412PW, and how should it be used?
On the UCC29412PW, the SD/FB pin serves exclusively as an active-low shutdown control-pulling it low disables switching and reduces supply current to 6 µA. Unlike the adjustable UCC29411 variant, UCC29412PW has a fixed 3.3 V output, so FB functionality is unused. The pin accepts standard CMOS/TTL logic levels and requires no external pull-up. This simplifies interface design versus variants requiring feedback dividers. For proper shutdown sequencing, tie SD/FB directly to a processor GPIO or system enable signal.
Is the UCC29412PW RoHS-compliant and qualified for industrial temperature range?
Yes, the UCC29412PW is RoHS-compliant (lead-free, NIPDAU finish) and rated for operation from –40°C to +85°C ambient temperature. It carries JEDEC MO-153 (TSSOP-8) qualification and meets TI's standard reliability testing for industrial applications. The device is listed as "Active" in TI's packaging database with MSL Level-2 (260°C reflow), confirming suitability for automated SMT assembly and extended deployment in harsh environments. All UCC29412PW units shipped by Aetrix Electronics meet these specifications.
UCC29412PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
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- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
- -
UCC29412PW FAQ
1.How can I place an order for UCC29412PW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC29412PW 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 UCC29412PW reliable?
The price and inventory of UCC29412PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC29412PW is usually 5 days.
3.What payment methods are accepted for UCC29412PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC29412PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC29412PW?
UCC29412PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC29412PW 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 UCC29412PW?
For technical support, including UCC29412PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC29412PW requirements.
6.How does Aetrix verify that UCC29412PW is sourced from the original manufacturer or authorized distributors?
All UCC29412PW 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 UCC29412PW meets industry standards.
7.What is the process for return or replacement of UCC29412PW?
All UCC29412PW units undergo pre-shipment inspection (PSI). If there is an issue with UCC29412PW, 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 UCC29412PW part is unused and in its original packaging.
Return procedure for UCC29412PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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