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Texas Instruments TPS3620-33DGKT
- Part No.:
- TPS3620-33DGKT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3620-33DGKT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,537
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Product details
Overview
TPS3620-33DGKT from Texas Instruments is a 3.3-V backup-battery supervisor IC with integrated switchover MOSFET, precision reset threshold (2.93 V typ), 100-ms power-on reset delay, and ultra-low battery-supply current (100 nA max). It monitors VDD and VBAT to maintain CMOS RAM retention during main power failure in portable or automotive systems.
For engineers reviewing the TPS3620-33DGKT datasheet, TPS3620-33DGKT pinout, TPS3620-33DGKT application, or TPS3620-33DGKT equivalent, key selection criteria include its dual-supply switchover capability, PFI/PFO power-fail detection, MR input for manual reset, and MSOP-8 package compatibility with space-constrained embedded designs.
Technical Context
The TPS3620-33DGKT implements a dual-path supply architecture: a 1-Ω (max) PMOS switch connects VDD to VOUT during normal operation, while a 15-Ω (typ) NMOS switch enables VBAT-to-VOUT switchover when VDD falls below 2.93 V. Its internal 1.15-V reference drives both the VDD supervisor and independent PFI comparator.
Reset assertion occurs at power-up when VDD exceeds 1.1 V, then remains active until VDD rises above 2.93 V and sustains that level for 100 ms; subsequent brownouts reassert RESET within 2–5 µs propagation delay. The device operates across –40°C to +85°C with no external components required for basic supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Supply Voltage | 3.3 V - Sets reset threshold at 2.93 V (–1.5% hysteresis), compatible with standard 3.3-V logic rails. |
| Reset Threshold Accuracy | ±2.5% over temperature - Ensures reliable microcontroller reset timing across industrial temperature range. |
| VDD Supply Current | 40 µA max - Minimizes primary supply loading in always-on monitoring applications. |
| VBAT Supply Current | 100 nA max - Enables multi-year battery-backed RAM retention using coin-cell or lithium sources. |
| Power-On Reset Delay | Fixed 100 ms - Guarantees stable core voltage before releasing processor from reset state. |
| VDD-to-VOUT rDS(on) | 0.6 Ω max - Limits voltage drop and power loss under 300-mA load during main supply operation. |
| PFI Threshold | 1.15 V ±12 mV hysteresis - Allows configurable power-fail detection via external resistor divider on any rail ≥1.65 V. |
Pinout & Package
The TPS3620-33DGKT 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 maximum height. Exposed thermal pad improves power dissipation in high-current switchover scenarios.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Output supply rail | Switched output connected to VDD (normal mode) or VBAT (backup mode); delivers up to 300 mA. |
| VDD (Pin 2) | Main supply input | Primary power source; powers internal circuitry and controls VDD-to-VOUT switch activation. |
| GND (Pin 3) | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold sensing. |
| PFI (Pin 4) | Power-fail input | Analog comparator input referenced to 1.15 V; detects falling voltage on external rails via resistor divider. |
| PFO (Pin 5) | Power-fail output | Active-low open-drain signal indicating PFI voltage has dropped below threshold. |
| RESET (Pin 7) | Reset output | Active-low open-drain reset signal with 100-ms delay; asserts during VDD brownout or startup. |
| MR (Pin 6) | Manual reset input | Active-low asynchronous reset trigger; debounced internally, requires >100 ns pulse width. |
| VBAT (Pin 8) | Backup battery input | Secondary supply source; automatically engages when VDD < 2.93 V and VBAT > VDD. |
Key Features
| Feature | Design Value |
|---|---|
| Backup-battery switchover | Automatic VBAT engagement when VDD drops below 2.93 V, preserving RAM data without software intervention. |
| Ultra-low battery current | 100 nA max VBAT quiescent draw extends shelf life of lithium or coin-cell backup sources beyond 10 years. |
| Dual independent comparators | Separate VDD supervisor and PFI comparator enable simultaneous monitoring of main rail and auxiliary supplies. |
| Fixed 100-ms reset timer | Guaranteed minimum reset pulse width eliminates need for external RC timing components. |
| MSOP-8 package | 3.05 mm × 4.98 mm footprint supports high-density PCB layouts in portable and automotive modules. |
Applications
| Portable Medical Monitors | Automotive Infotainment |
|---|---|
Use Scenario: Long-term patient vitals logging in battery-powered ECG or glucose meters requiring RAM retention during charging cycles. IC Role / Device Role / Timing Role: Backup-battery supervisor ensuring continuous SRAM power during AC adapter disconnection or low-battery transitions. Use Value: 100 nA VBAT current enables >5-year data retention on CR2032 cells; 100-ms reset ensures clean MCU boot after power recovery. | Use Scenario: Head unit memory preservation during engine cranking-induced 6-V dips on 12-V supply rails. IC Role / Device Role / Timing Role: Dual-rail monitor detecting both main 5-V logic rail collapse and 3.3-V processor rail brownout via PFI divider. Use Value: 2.93-V reset threshold aligns with automotive 3.3-V MCU requirements; 2–5 µs propagation enables fast fault response. |
| Point-of-Sale Terminals | Industrial PLC Modules |
Use Scenario: Transaction rollback protection in handheld POS devices where sudden AC loss must preserve pending payment records. IC Role / Device Role / Timing Role: Switchover controller routing VBAT to SRAM and real-time clock during main power interruption. Use Value: VBAT-to-VOUT rDS(on) ≤15 Ω ensures <50 mV drop at 3.3 V/10 mA, maintaining RTC accuracy during backup mode. | Use Scenario: Firmware update safeguard in programmable logic controllers where corrupted flash writes must be prevented during brownouts. IC Role / Device Role / Timing Role: System-level reset generator asserting RESET within 100 ms of VDD crossing 2.93 V, blocking unsafe CPU execution. Use Value: ±2.5% threshold tolerance guarantees deterministic reset across –40°C to +85°C ambient, critical for factory-floor reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backup-battery supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3619-33DGKR | Includes battery freshness seal; otherwise identical electrical specs and pinout. | Required only when end-product assembly includes pre-installation of backup battery prior to final commissioning. | Select TPS3619-33DGKR if battery must remain isolated until first power-up; otherwise TPS3620-33DGKT is direct functional replacement. |
| MAX819MESA+ | 3.3-V supervisor with 140-ms reset timeout; no VBAT switchover or PFI/PFO functionality. | Limited to single-rail reset generation; cannot support RAM backup or auxiliary supply monitoring. | Choose MAX819MESA+ only for cost-sensitive designs needing basic reset only-no battery management or power-fail detection. |
Compared with TPS3619-33DGKR, TPS3620-33DGKT omits the battery freshness seal but retains full switchover and PFI capability; versus MAX819MESA+, it adds critical dual-supply control and failsafe monitoring essential for data-retention systems.
Availability
TPS3620-33DGKT is available at Aetrix Electronics and suitable for portable medical monitors, automotive infotainment units, and point-of-sale terminals requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TPS3620-33DGKT 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 industrial and automotive electronics.
The TPS3620 family is designed specifically for backup-battery supervision in RAM-retention systems, delivering ultra-low quiescent current, precise reset thresholds, and seamless switchover between main and backup supplies.
FAQ
What is the reset threshold voltage of the TPS3620-33DGKT?
The TPS3620-33DGKT has a nominal reset threshold of 2.93 V with ±2.5% accuracy over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table under VIT– parameter. The threshold is fixed for the -33 variant and applies to VDD monitoring; it triggers RESET assertion when VDD falls below this level and releases RESET after VDD rises above it and sustains for 100 ms. The TPS3620-33DGKT does not support adjustable thresholds.
Does the TPS3620-33DGKT support automatic switchover between VDD and VBAT?
Yes, the TPS3620-33DGKT supports fully automatic switchover: when VDD falls below the 2.93-V reset threshold and VBAT exceeds VDD, the internal 15-Ω NMOS switch connects VBAT to VOUT to maintain power to attached RAM or RTC. When VDD recovers above VIT, the 1-Ω PMOS switch reconnects VDD to VOUT. No external control signals or firmware intervention are required for this transition in the TPS3620-33DGKT.
Can the TPS3620-33DGKT monitor a secondary supply rail other than VDD?
Yes, the TPS3620-33DGKT includes a dedicated PFI (power-fail input) pin referenced to an internal 1.15-V comparator. By connecting a resistor divider from the secondary rail to GND with PFI at the midpoint, users can configure detection of any voltage ≥1.65 V. The PFO output goes low when the divided voltage drops below 1.15 V, providing a separate power-fail alert independent of VDD supervision in the TPS3620-33DGKT.
What is the maximum continuous output current supported by the TPS3620-33DGKT?
The TPS3620-33DGKT supports up to 300 mA continuous output current at VOUT in either VDD or VBAT mode. This rating is confirmed in the Recommended Operating Conditions table. Derating applies above +70°C ambient per the Dissipation Rating Table; at +85°C, maximum power dissipation is 241 mW. The VDD-to-VOUT rDS(on) is 0.6 Ω max, limiting voltage drop to <180 mV at 300 mA, ensuring stable operation for typical SRAM and RTC loads in the TPS3620-33DGKT.
Is the TPS3620-33DGKT pin-compatible with industry-standard supervisors like MAX819?
Yes, the TPS3620-33DGKT is explicitly stated as pin-for-pin compatible with MAX819, MAX703, and MAX704 in the Features section of the datasheet. All share the same 8-pin MSOP (DGK) footprint, VDD/VOUT/GND/RESET/MR/PFI/PFO pin assignments, and functional behavior for basic reset generation. However, the TPS3620-33DGKT adds VBAT switchover and PFI/PFO capability not present in those legacy parts-making it a functional superset while maintaining mechanical and electrical drop-in compatibility.
TPS3620-33DGKT 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:
- 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
TPS3620-33DGKT FAQ
1.How can I place an order for TPS3620-33DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3620-33DGKT 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 TPS3620-33DGKT reliable?
The price and inventory of TPS3620-33DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3620-33DGKT is usually 5 days.
3.What payment methods are accepted for TPS3620-33DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3620-33DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3620-33DGKT?
TPS3620-33DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3620-33DGKT 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 TPS3620-33DGKT?
For technical support, including TPS3620-33DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3620-33DGKT requirements.
6.How does Aetrix verify that TPS3620-33DGKT is sourced from the original manufacturer or authorized distributors?
All TPS3620-33DGKT 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 TPS3620-33DGKT meets industry standards.
7.What is the process for return or replacement of TPS3620-33DGKT?
All TPS3620-33DGKT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3620-33DGKT, 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 TPS3620-33DGKT part is unused and in its original packaging.
Return procedure for TPS3620-33DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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