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Texas Instruments TPS3619-50DGKRG4
- Part No.:
- TPS3619-50DGKRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3619-50DGKRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
TPS3619-50DGKRG4 from Texas Instruments is a backup-battery supervisor IC for CMOS RAM retention, featuring 5.0 V nominal supply voltage monitoring, 4.55 V reset threshold (±30 mV), 40 µA max VDD supply current, and integrated switchover control between main supply (VDD) and backup battery (VBAT). It operates in portable battery-powered equipment requiring reliable power-fail detection and seamless RAM backup.
For engineers reviewing the TPS3619-50DGKRG4 datasheet, TPS3619-50DGKRG4 pinout, TPS3619-50DGKRG4 application, or TPS3619-50DGKRG4 equivalent, key selection criteria include its 8-pin VSSOP package, 100-ms fixed power-on reset delay, battery-freshness seal function (TPS3619 family), and dual-supply switchover capability with <1 Ω VDD-to-VOUT on-resistance.
Technical Context
The TPS3619-50DGKRG4 implements a precision voltage monitor with internal 1.15 V reference for both VDD and PFI inputs, enabling independent reset assertion at 4.55 V (VIT−) and power-fail detection at 1.15 V (VPFI). Its switchover logic uses comparator outputs and timer-controlled state transitions to manage VOUT sourcing from either VDD or VBAT based on voltage thresholds and hysteresis.
It integrates a battery freshness seal that isolates VBAT until first power-up, preventing pre-deployment discharge. The device supports manual reset via MR input and provides active-low RESET and PFO outputs with TTL-compatible drive strength-up to 3 mA sink current at VDD = 5 V and VOL ≤ 0.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal VDD | 5.0 V - Sets primary supply monitoring threshold; matches standard 5-V system rails. |
| VIT− (Reset Threshold) | 4.55 V (typ) - Triggers active-low RESET when VDD drops below this level; ±30 mV hysteresis ensures noise immunity. |
| VDD Supply Current | 40 µA (max) - Enables ultra-low-power operation in always-on backup systems without draining main supply. |
| VBAT Supply Current | 100 nA (max) - Minimizes self-discharge during long-term battery-backed RAM retention. |
| VDD-to-VOUT rDS(on) | 0.6–1.0 Ω - Ensures minimal voltage drop (<200 mV at 200 mA) when sourcing from main supply. |
| Power-On Reset Delay | 100 ms (fixed) - Guarantees stable microcontroller initialization before release of RESET signal. |
| Operating Temperature | –40°C to +85°C - Validated for industrial and automotive-grade embedded applications. |
Pinout & Package
TPS3619-50DGKRG4 is housed in an 8-pin VSSOP (DGK) package measuring 3.05 mm × 4.98 mm, with 0.65 mm lead pitch and 1.1 mm max height. The exposed pad is not electrically connected per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Output power rail | Switched output sourced from VDD or VBAT; connects to RAM VCC via low-RDS(on) PMOS path. |
| VDD (Pin 2) | Main supply input | Primary 5-V system rail; monitored for reset generation and used as VOUT source when valid. |
| GND (Pin 3) | Ground reference | Common return for all analog and digital circuitry; required for accurate threshold comparison. |
| PFI (Pin 4) | Power-fail input | Monitors external voltage (e.g., 3.3 V rail) via resistor divider; triggers PFO when falling below 1.15 V. |
| PFO (Pin 5) | Power-fail output | Active-low open-drain signal indicating external supply failure; requires pull-up for logic-level interface. |
| MR (Pin 6) | Manual reset input | Active-low asynchronous reset override; debounced internally with 100 ns/V minimum slew rate requirement. |
| RESET (Pin 7) | Reset output | Active-low push-pull output asserting microcontroller reset until VDD exceeds VIT− by hysteresis margin. |
| VBAT (Pin 8) | Backup battery input | Accepts lithium cell (e.g., 3.6 V); isolated by freshness seal until first power-up; enables switchover when VDD fails. |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | Prevents VBAT discharge prior to deployment; automatically disabled on first VDD application with >5-ms pulse. |
| Dual-supply switchover | Automatically routes VOUT from VDD to VBAT when VDD falls below VIT− and VBAT > VDD; no external control needed. |
| Fixed 100-ms POR delay | Ensures deterministic reset timing across temperature and voltage; eliminates need for external RC timing components. |
| Independent PFI/PFO comparator | Monitors secondary supply independently of VDD; 1.15 V internal reference with 12 mV hysteresis prevents chatter during brownouts. |
| Pin-for-pin compatibility | Direct replacement for MAX819, MAX703, and MAX704 in existing 8-pin MSOP layouts-no PCB redesign required. |
Applications
| Portable Battery-Powered Equipment | Fax Machines |
|---|---|
Use Scenario: Handheld data loggers retain sensor history during intermittent battery replacement or charging cycles. IC Role / Device Role / Timing Role: Supervises main 5-V supply and switches RAM to 3.6-V lithium backup upon brownout; asserts RESET to halt CPU writes during transition. Use Value: Prevents RAM corruption with sub-100-µs switchover latency and guarantees full 100-ms reset hold time after power recovery. | Use Scenario: Fax machines maintain memory of unsent documents and configuration settings during AC power loss. IC Role / Device Role / Timing Role: Monitors 5-V DC rail derived from AC adapter; triggers PFO to initiate graceful shutdown while VOUT sustains SRAM. Use Value: Eliminates need for discrete diode-OR and reset controller; reduces BOM count by 3 components versus discrete solution. |
| Set-Top Boxes | Automotive Systems |
Use Scenario: Digital cable boxes preserve channel lineup and parental controls during brief grid interruptions. IC Role / Device Role / Timing Role: Uses PFI to monitor 3.3-V SoC supply; asserts PFO to trigger firmware save-to-flash before VDD collapse. Use Value: Enables reliable non-volatile storage without adding EEPROM write-cycle overhead during power events. | Use Scenario: Telematics control units retain GPS last-known position and diagnostic trouble codes during ignition-off battery drain. IC Role / Device Role / Timing Role: Supervises 5-V infotainment rail; activates VBAT path only when VDD < 4.55 V and VBAT > VDD, avoiding premature battery use. Use Value: Extends backup runtime by >30% versus always-connected battery solutions due to hysteresis-governed switchover. |
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 pinout and electrical specs, but lacks battery freshness seal; higher VBAT supply current (0.5 µA vs. 100 nA). | Suitable for cost-sensitive designs where pre-deployment battery drain is not a concern. | Select TPS3620-50DGKR if freshness seal is unnecessary and lower unit cost is prioritized. |
| MAX704CSA+ | 5-V supervisor with 4.65 V reset threshold; no PFI/PFO comparator; no battery switchover; SO-8 package. | Limited to basic reset generation-requires external circuitry for RAM backup management. | Choose MAX704CSA+ only when switchover functionality is handled externally and footprint compatibility is critical. |
Compared with TPS3619-50DGKRG4, TPS3620-50DGKR offers identical supervision and switchover but omits the freshness seal, while MAX704CSA+ provides only reset generation-making TPS3619-50DGKRG4 uniquely suited for integrated, low-leakage RAM retention in portable systems.
Availability
TPS3619-50DGKRG4 is available at Aetrix Electronics and suitable for portable battery-powered equipment, fax machines, set-top boxes, and automotive telematics systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TPS3619-50DGKRG4 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 over 50 years of innovation in high-reliability industrial and automotive ICs.
The TPS3619 family was designed specifically for backup-battery supervision in RAM-retention applications, emphasizing ultra-low quiescent current, precise threshold accuracy, and integrated switchover logic to eliminate external MOSFETs and diodes.
FAQ
What is the reset threshold voltage for TPS3619-50DGKRG4?
The TPS3619-50DGKRG4 has a nominal negative-going reset threshold (VIT−) of 4.55 V, with ±30 mV tolerance over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "TPS3619-50" row. The device asserts active-low RESET when VDD falls below this threshold and releases it after VDD rises above 4.55 V plus hysteresis (≥4.64 V).
Does TPS3619-50DGKRG4 support automatic switchover between main supply and backup battery?
Yes, TPS3619-50DGKRG4 automatically switches VOUT from VDD to VBAT when VDD falls below the reset threshold (4.55 V) and VBAT exceeds VDD. Switchover occurs through an internal 15-Ω switch (VBAT-to-VOUT path) and is governed by comparator outputs and timing logic-no external control signals are required. The TPS3619-50DGKRG4 datasheet confirms this behavior in the Functional Block Diagram and Table 1 (Function Table).
What is the purpose of the battery freshness seal in TPS3619-50DGKRG4?
The battery freshness seal in TPS3619-50DGKRG4 disconnects VBAT from internal circuitry until first power-up, preventing pre-deployment discharge of the backup battery. It is enabled by default and removed automatically on the rising edge of RESET during initial VDD application. This feature is exclusive to the TPS3619 family (not present in TPS3620 variants) and is documented in the DETAILED DESCRIPTION section of the TPS3619-50DGKRG4 datasheet.
Can TPS3619-50DGKRG4 monitor a secondary supply voltage other than VDD?
Yes, TPS3619-50DGKRG4 includes a dedicated power-fail comparator with PFI (Pin 4) and PFO (Pin 5). PFI accepts an external voltage-typically scaled via resistor divider-and compares it to an internal 1.15 V reference. When the PFI voltage falls below 1.15 V (with 12 mV hysteresis), PFO goes low. This allows independent monitoring of auxiliary rails like 3.3 V or 2.5 V without affecting VDD supervision.
What package type and dimensions does TPS3619-50DGKRG4 use?
TPS3619-50DGKRG4 uses the DGK package: an 8-pin VSSOP (Very Small Outline Package) measuring 3.05 mm × 4.98 mm with 0.65 mm lead pitch and 1.1 mm maximum height. The part marking is "AFM", and it is RoHS-compliant with NiPdAu lead finish. This package is confirmed in TI's PACKAGE OPTION ADDENDUM and matches the mechanical drawing DGK0008A referenced in the TPS3619-50DGKRG4 datasheet.
TPS3619-50DGKRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
TPS3619-50DGKRG4 FAQ
1.How can I place an order for TPS3619-50DGKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3619-50DGKRG4 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 TPS3619-50DGKRG4 reliable?
The price and inventory of TPS3619-50DGKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3619-50DGKRG4 is usually 5 days.
3.What payment methods are accepted for TPS3619-50DGKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3619-50DGKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3619-50DGKRG4?
TPS3619-50DGKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3619-50DGKRG4 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 TPS3619-50DGKRG4?
For technical support, including TPS3619-50DGKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3619-50DGKRG4 requirements.
6.How does Aetrix verify that TPS3619-50DGKRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3619-50DGKRG4 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 TPS3619-50DGKRG4 meets industry standards.
7.What is the process for return or replacement of TPS3619-50DGKRG4?
All TPS3619-50DGKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3619-50DGKRG4, 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 TPS3619-50DGKRG4 part is unused and in its original packaging.
Return procedure for TPS3619-50DGKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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