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Texas Instruments TPS3619-50DGK
- Part No.:
- TPS3619-50DGK
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3619-50DGK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,172
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Product details
Overview
TPS3619-50DGK from Texas Instruments is a backup-battery supervisor IC designed for RAM retention in systems with dual power sources. It provides precision 5.0 V supply monitoring (VIT = 4.55 V typ), active-low RESET with 100-ms delay, battery switchover via VOUT output (rDS(on) ≤ 1 Ω from VDD), and power-fail detection via PFI/PFO. Used in portable battery-powered equipment requiring nonvolatile data preservation during main supply loss.
For engineers reviewing the TPS3619-50DGK datasheet, TPS3619-50DGK pinout, TPS3619-50DGK application, or TPS3619-50DGK equivalent, key selection criteria include its 5.0 V threshold accuracy, 40 µA max VDD supply current, 100 nA max battery-supply current, and integrated battery-freshness seal functionality unique to the TPS3619 family.
Technical Context
The TPS3619-50DGK implements a dual-path power management architecture: one path monitors VDD against a precision 4.55 V threshold with hysteresis (60 mV), triggering RESET on undervoltage; the other enables seamless switchover to VBAT when VDD falls below VIT and VBAT > VDD, using internal PMOS switches with specified on-resistance (≤1 Ω from VDD, ≤15 Ω from VBAT).
It integrates a dedicated power-fail comparator (PFI referenced to 1.15 V) with 12 mV hysteresis and a battery freshness seal that isolates VBAT until first power-up, preventing pre-deployment discharge. All timing functions-including RESET assertion delay (100 ms), PFI-to-PFO propagation (3–5 µs), and MR-to-RESET response (0.1–1 µs)-are internally generated without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT Threshold | 4.46–4.64 V (5.0 V nominal); ensures reliable reset initiation at precise system supply margin |
| VDD Supply Current | 40 µA max; minimizes primary supply loading in always-on monitoring applications |
| VBAT Supply Current | 100 nA max; preserves backup battery life for multi-year RAM retention |
| VDD-to-VOUT rDS(on) | ≤1 Ω (typ); limits voltage drop and power loss during main supply operation |
| RESET Delay Time | Fixed 100 ms; guarantees full microcontroller initialization before release |
| Operating Temp | –40°C to +85°C; supports industrial and automotive-adjacent environments |
| PFI Reference | 1.15 V internal reference with 12 mV hysteresis; enables accurate external rail monitoring |
Pinout & Package
VSSOP-8 (DGK) package: 3.05 mm × 4.98 mm body, 1.1 mm max height, 0.65 mm lead pitch, exposed thermal pad (PowerPAD™). RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Power output | Switched supply output connected to VDD or VBAT based on supervision logic; drives RAM VCC |
| VDD (Pin 2) | Main supply input | Primary system supply input (1.65–5.5 V); powers internal circuitry and controls switchover |
| GND (Pin 3) | Ground reference | Common return path for all analog and digital functions; critical for threshold stability |
| PFI (Pin 4) | Power-fail input | Analog input for external voltage monitoring; compared to 1.15 V internal reference |
| PFO (Pin 5) | Power-fail output | Active-low open-drain signal indicating PFI undervoltage; used for early warning or system shutdown |
| MR (Pin 6) | Manual reset input | Active-low asynchronous reset trigger; overrides automatic reset timing for forced system restart |
| RESET (Pin 7) | Reset output | Active-low open-drain reset signal with 100-ms delay; holds microcontroller in reset until stable supply |
| VBAT (Pin 8) | Backup battery input | Secondary supply input (1.5–5.5 V); isolated by freshness seal until first power-up, then enabled for switchover |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | Physically disconnects VBAT from internal circuitry until first VDD application, preventing pre-deployment battery drain |
| Integrated switchover logic | Automatically connects VBAT to VOUT only when VDD < VIT and VBAT > VDD-no external control required |
| Low-quiescent current | 40 µA max VDD current + 100 nA max VBAT current enables multi-year backup operation |
| Fixed 100-ms RESET delay | Guarantees sufficient time for power rail stabilization and microcontroller POR sequence completion |
| Pin-compatible alternatives | Direct replacement for MAX819/MAX703/MAX704 in 5 V systems; same 8-pin MSOP footprint and function mapping |
Applications
| Portable Battery-Powered Equipment | Fax Machines |
|---|---|
Use Scenario: Handheld medical data loggers retaining sensor history during battery swaps. IC Role / Device Role / Timing Role: Supervises main Li-ion supply and enables automatic switchover to coin-cell backup to preserve RAM contents. Use Value: Eliminates need for external switchover MOSFETs and timing RC networks, reducing BOM count and layout area. |
Use Scenario: Fax machines maintaining memory of dialing history and settings across AC power interruptions. IC Role / Device Role / Timing Role: Generates clean 100-ms RESET pulse on AC brownout and asserts PFO to trigger graceful document save before power loss. Use Value: Prevents corrupted memory writes during unstable supply conditions using built-in hysteresis and delay timing. |
| Computer Equipment | Point-of-Sale Equipment |
Use Scenario: Industrial PCs storing BIOS configuration and real-time clock data in CMOS RAM. IC Role / Device Role / Timing Role: Monitors 5 V standby rail and activates VBAT path within microseconds of VDD collapse to sustain RAM voltage. Use Value: Achieves sub-100 ns switchover latency with ≤15 Ω VBAT-to-VOUT resistance, minimizing RAM voltage droop. |
Use Scenario: Retail POS terminals preserving transaction buffers and encryption keys during brief grid outages. IC Role / Device Role / Timing Role: Uses PFI to monitor 3.3 V I/O rail and triggers PFO alert before main 5 V rail fails, enabling preemptive data commit. Use Value: Leverages 1.15 V internal reference and 12 mV hysteresis to detect marginal rail conditions with high noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backup-battery supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3620-50DGKR | Same 5.0 V threshold and pinout, but lacks battery freshness seal; higher VBAT supply current (0.5 µA vs 100 nA) | Suitable where pre-deployment battery life is not critical and cost optimization is prioritized | Select when long-term shelf storage without battery drain is unnecessary and lower unit cost is required |
| MAX704CPA+ | 5 V supervisor with 100 ms reset, but no VBAT switchover or PFI/PFO; DIP-8 package (not MSOP-8) | Limited to basic reset generation; requires external circuitry for battery backup functionality | Choose only for legacy through-hole designs where switchover is implemented discretely and board space is unconstrained |
Compared with TPS3619-50DGK, TPS3620-50DGKR offers identical supervision timing and threshold but sacrifices battery-freshness sealing and ultra-low VBAT leakage, while MAX704CPA+ provides only reset functionality in a larger package, requiring additional components for full backup capability.
Availability
TPS3619-50DGK is available at Aetrix Electronics and suitable for portable battery-powered equipment, fax machines, computer equipment, and point-of-sale equipment requiring stable component supply with guaranteed long-term RAM retention capability.
Supply support for TPS3619-50DGK 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-reliability supervisory circuits.
The TPS3619 family was engineered specifically for low-power, dual-supply systems needing guaranteed RAM data integrity during main power failure-emphasizing ultra-low VBAT current, integrated switchover, and factory-sealed battery readiness.
FAQ
What is the exact reset threshold voltage for TPS3619-50DGK?
The TPS3619-50DGK has a guaranteed negative-going input threshold voltage (VIT–) of 4.46 V (min) to 4.64 V (max) over –40°C to +85°C, with a typical value of 4.55 V. This 5.0 V nominal threshold is laser-trimmed at wafer test and applies specifically to the TPS3619-50DGK variant-not the -33 version or TPS3620 family members.
Does TPS3619-50DGK support backup battery voltages higher than the main supply?
Yes, the TPS3619-50DGK explicitly supports VBAT > VDD operation. Its internal switchover logic connects VBAT to VOUT only when VDD falls below VIT and VBAT exceeds VDD, allowing use of standard 3.6 V lithium batteries with 5 V main rails. The VBAT-to-VOUT rDS(on) is 8–15 Ω, ensuring controlled transition without voltage overshoot.
How does the battery freshness seal work on TPS3619-50DGK?
The battery freshness seal in TPS3619-50DGK is a factory-programmed feature that electrically isolates VBAT from internal circuitry until first power application. It is automatically disabled upon the positive-going edge of RESET during initial VDD power-up. No external programming or configuration is needed-the seal remains active during storage and shipping, preserving battery shelf life.
Can TPS3619-50DGK monitor a secondary voltage rail besides VDD?
Yes, the TPS3619-50DGK includes a dedicated power-fail comparator with PFI input referenced to an internal 1.15 V bandgap. By connecting a resistor divider from any external rail to PFI, designers can monitor voltages above ~1.15 V. The PFO output asserts low when the divided voltage drops below VPFI (1.13–1.17 V), providing early warning of secondary rail failure independent of VDD status.
What is the maximum continuous output current capability of TPS3619-50DGK's VOUT pin?
The TPS3619-50DGK VOUT pin supports up to 300 mA continuous output current in normal mode (VDD powering VOUT) and up to 200 mA in battery-backup mode (VBAT powering VOUT). These ratings are specified under recommended operating conditions and ensure safe operation into typical CMOS RAM loads without thermal derating at +85°C ambient.
TPS3619-50DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- 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
TPS3619-50DGK FAQ
1.How can I place an order for TPS3619-50DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3619-50DGK 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 TPS3619-50DGK reliable?
The price and inventory of TPS3619-50DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3619-50DGK is usually 5 days.
3.What payment methods are accepted for TPS3619-50DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3619-50DGK transactions.
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4.How is shipping managed for TPS3619-50DGK?
TPS3619-50DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3619-50DGK 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 TPS3619-50DGK?
For technical support, including TPS3619-50DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3619-50DGK requirements.
6.How does Aetrix verify that TPS3619-50DGK is sourced from the original manufacturer or authorized distributors?
All TPS3619-50DGK 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 TPS3619-50DGK meets industry standards.
7.What is the process for return or replacement of TPS3619-50DGK?
All TPS3619-50DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS3619-50DGK, 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 TPS3619-50DGK part is unused and in its original packaging.
Return procedure for TPS3619-50DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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