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Texas Instruments TPS3619-33DGK
- Part No.:
- TPS3619-33DGK
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3619-33DGK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,486
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Product details
Overview
TPS3619-33DGK from Texas Instruments is a 3.3-V backup-battery supervisor IC with integrated switchover MOSFET, precision 2.93-V reset threshold (±1.5%), 100-ms power-on reset delay, and ultra-low 40-µA VDD supply current. It monitors VDD for brownout detection, manages automatic RAM retention via VBAT switchover, and provides active-low RESET and PFO outputs for microcontroller-based systems requiring nonvolatile memory backup.
For engineers reviewing the TPS3619-33DGK datasheet, TPS3619-33DGK pinout, TPS3619-33DGK application, or TPS3619-33DGK equivalent, this device serves as a critical power-fail and battery-switchover controller in portable, automotive, and industrial equipment where data integrity during main-power interruption is essential.
Technical Context
The TPS3619-33DGK implements dual-path voltage supervision: a precision bandgap-based comparator monitors VDD against a 2.93-V threshold with 40-mV hysteresis, while a separate 1.15-V reference compares PFI for customizable power-fail detection. Its internal 100-ms reset timer ensures reliable processor initialization after power-up.
A dedicated PMOS switch enables seamless switchover between VDD and VBAT (up to 5.5 V), with VDD-to-VOUT rDS(on) ≤1 Ω and VBAT-to-VOUT rDS(on) ≤15 Ω at 25°C. The battery freshness seal feature-enabled only on TPS3619 variants-prevents pre-deployment discharge of backup cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.93 V ±1.5% - precise brownout detection for 3.3-V systems without external resistor dividers |
| VDD Supply Current | 40 µA max - enables long-term operation from primary supply without significant load |
| VBAT Supply Current | 100 nA max - preserves lithium backup battery life for multi-year RAM retention |
| Reset Delay Time | Fixed 100 ms - guarantees full microcontroller power stabilization before release |
| VDD-to-VOUT rDS(on) | ≤1 Ω - minimizes voltage drop and power loss during primary-supply operation |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin and industrial embedded environments |
| Package | VSSOP-8 (DGK), 3.05 mm × 4.98 mm - space-constrained PCB layout compatibility |
Pinout & Package
VSSOP-8 (DGK) package: 3.05 mm × 4.98 mm body, 0.65-mm lead pitch, 1.1-mm max height, exposed thermal pad (non-electrical), RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Power output | Switched output connected to VDD or VBAT depending on supply status; drives CMOS RAM supply rail |
| VDD | Main supply input | Primary system supply (1.65–5.5 V); powers internal circuitry and controls VDD-to-VOUT path |
| GND | Ground reference | Analog and digital ground common node; required for accurate threshold and timing references |
| PFI | Power-fail comparator input | Monitors external voltage (e.g., 5-V rail) via resistor divider; triggers PFO when below 1.15 V |
| PFO | Power-fail comparator output | Active-low open-drain signal indicating external supply failure; used for early warning or backup activation |
| RESET | Reset generator output | Active-low open-drain reset signal with 100-ms delay; asserts during VDD < 2.93 V or MR low |
| MR | Manual reset input | Active-low asynchronous reset override; debounced internally, no external capacitor needed |
| VBAT | Backup battery input | Accepts 1.5–5.5 V backup source; isolated until VDD falls below threshold, then connects via 15-Ω switch |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | Disables VBAT connection until first power-up, preventing shelf-life discharge of lithium backup cells |
| Integrated switchover MOSFET | Eliminates need for external diodes or discrete FETs; reduces BOM count and board area in RAM-retention circuits |
| Pin-for-pin compatibility | Direct replacement for MAX819, MAX703, and MAX704 in existing designs-no layout changes required |
| Low-power PFI monitoring | Input bias current ≤25 nA enables high-impedance resistor dividers (≈1 MΩ total) for minimal standby drain |
| Reset assertion at 1.1 V | Guarantees early reset activation during deep brownout, before core logic becomes unstable |
Applications
| Portable Medical Monitors | Automotive Infotainment Systems |
|---|---|
Use Scenario: Continuous ECG/SpO₂ logging during vehicle ignition cycles or battery swaps. IC Role / Device Role / Timing Role: Supervises 3.3-V MCU supply and switches RAM to coin-cell backup within 10 µs of VDD collapse. Use Value: Prevents loss of patient waveform history during transient power interruptions. |
Use Scenario: Preserving radio presets, navigation waypoints, and Bluetooth pairing during engine cranking. IC Role / Device Role / Timing Role: Detects 12-V system sag to 9 V via PFI divider and asserts RESET before MCU corruption occurs. Use Value: Enables instant UI recovery post-cranking without reinitialization delay or data reload. |
| Industrial PLC Data Loggers | Point-of-Sale Terminals |
Use Scenario: Maintaining real-time clock and sensor calibration tables during AC mains dropout. IC Role / Device Role / Timing Role: Uses VBAT switchover and 100-ms RESET hold to freeze firmware state until stable VDD returns. Use Value: Eliminates need for supercapacitor-based hold-up, reducing cost and footprint vs. discrete solutions. |
Use Scenario: Securing transaction logs and encryption keys during brief power flickers in retail outlets. IC Role / Device Role / Timing Role: Triggers immediate write-to-flash upon PFO assertion, synchronized with RESET assertion. Use Value: Guarantees atomic commit of financial data even under sub-50-ms outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backup-battery supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3620-33DGKR | Includes PFI hysteresis disable option and higher VBAT-to-VOUT rDS(on) (15 Ω typ vs. 12.5 Ω typ) | Lacks battery freshness seal; intended for systems where backup battery is always connected | Select when VBAT is permanently installed and freshness seal functionality is unnecessary |
| MAX706CSA+ | 3.08-V reset threshold, no VBAT switchover, no PFI input, 12-µA quiescent current | Requires external diode for backup switching; limited to basic reset-only use cases | Choose only if switchover and power-fail monitoring are not required and ultra-low IDD is critical |
Compared with TPS3619-33DGK, TPS3620-33DGKR offers identical switchover and reset functions but omits the battery freshness seal, while MAX706CSA+ provides lower quiescent current at the cost of losing integrated backup management-making TPS3619-33DGK the only solution supporting both zero-shelf-life drain and autonomous RAM retention.
Availability
TPS3619-33DGK is available at Aetrix Electronics and suitable for portable medical monitors, automotive infotainment systems, and industrial PLC data loggers requiring stable component supply across extended production lifecycles.
Supply support for TPS3619-33DGK 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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.
The TPS3619 family was designed specifically for backup-battery switchover in RAM-retention systems, emphasizing ultra-low VBAT leakage, precision reset thresholds, and integrated power-path control to replace discrete diode-FET solutions.
FAQ
What is the exact reset threshold voltage of the TPS3619-33DGK?
The TPS3619-33DGK has a nominal reset threshold voltage of 2.93 V with ±1.5% tolerance over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS387H datasheet. The TPS3619-33DGK uses an internal bandgap reference to maintain stability across temperature and supply variations, ensuring reliable brownout detection in 3.3-V systems without external calibration.
Does the TPS3619-33DGK support automatic switchover to backup battery?
Yes, the TPS3619-33DGK automatically switches VOUT from VDD to VBAT when VDD falls below the 2.93-V reset threshold and VBAT exceeds VDD. This switchover is implemented using an internal PMOS switch with ≤15-Ω on-resistance, enabling uninterrupted power to connected CMOS RAM. The TPS3619-33DGK also features a battery freshness seal that isolates VBAT until first power-up, preventing pre-deployment discharge.
Can the TPS3619-33DGK monitor a 5-V supply while powering a 3.3-V microcontroller?
Yes, the TPS3619-33DGK supports dual-supply monitoring: its PFI input accepts voltages up to VDD + 0.3 V and compares them to a 1.15-V internal reference. By connecting a resistor divider from a 5-V rail to PFI, the TPS3619-33DGK generates a PFO alert when the 5-V supply drops below the programmed threshold. Meanwhile, VDD remains at 3.3 V to supervise the MCU supply directly-enabling coordinated fail-safe response across multiple rails.
What is the maximum continuous output current capability of the TPS3619-33DGK?
The TPS3619-33DGK supports up to 300 mA continuous output current at VOUT, as specified in the Recommended Operating Conditions table. This rating applies in both VDD-powered and VBAT-powered modes. The device's VDD-to-VOUT rDS(on) ≤1 Ω and VBAT-to-VOUT rDS(on) ≤15 Ω ensure low dropout and minimal self-heating under full load, making the TPS3619-33DGK suitable for driving typical SRAM banks and RTC circuits without external buffering.
Is the TPS3619-33DGK pin-compatible with legacy Maxim supervisors?
Yes, the TPS3619-33DGK is explicitly designed as a pin-for-pin compatible replacement for MAX819, MAX703, and MAX704 in VSSOP-8 packages. Pin assignments-including VOUT, VDD, GND, PFI, PFO, RESET, MR, and VBAT-match identically, and electrical characteristics (reset threshold, delay time, drive strength) are aligned to enable drop-in substitution. No PCB layout changes or firmware modifications are required when migrating to the TPS3619-33DGK.
TPS3619-33DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 60ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS3619-33DGK FAQ
1.How can I place an order for TPS3619-33DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3619-33DGK 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 TPS3619-33DGK reliable?
The price and inventory of TPS3619-33DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3619-33DGK is usually 5 days.
3.What payment methods are accepted for TPS3619-33DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3619-33DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3619-33DGK?
TPS3619-33DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3619-33DGK 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 TPS3619-33DGK?
For technical support, including TPS3619-33DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3619-33DGK requirements.
6.How does Aetrix verify that TPS3619-33DGK is sourced from the original manufacturer or authorized distributors?
All TPS3619-33DGK 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 TPS3619-33DGK meets industry standards.
7.What is the process for return or replacement of TPS3619-33DGK?
All TPS3619-33DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS3619-33DGK, 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 TPS3619-33DGK part is unused and in its original packaging.
Return procedure for TPS3619-33DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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