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Texas Instruments TPS3620-50DGKR
- Part No.:
- TPS3620-50DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3620-50DGKR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,102
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Product details
Overview
TPS3620-50DGKR from Texas Instruments is a 5-V backup-battery supervisor IC with precision supply voltage monitoring, active-low reset output (RESET), power-fail comparator (PFO/PFI), and automatic VDD/VBAT switchover for RAM retention. It features 40 µA max VDD supply current, 100 nA max battery-supply current, fixed 100-ms power-on reset delay, and operates from –40°C to +85°C in portable battery-powered equipment requiring nonvolatile memory backup.
For engineers reviewing the TPS3620-50DGKR datasheet, TPS3620-50DGKR pinout, TPS3620-50DGKR application, or TPS3620-50DGKR equivalent, key selection criteria include its 4.55 V nominal reset threshold (VIT), 15 Ω typical VBAT-to-VOUT on-resistance, 1.15 V PFI reference, and compatibility with lithium backup cells exceeding VDD - critical for fail-safe data retention in brownout conditions.
Technical Context
The TPS3620-50DGKR integrates dual-path power management: a precision bandgap-based voltage monitor for VDD (4.46–4.64 V hysteresis window) and an independent 1.15 V reference comparator for external PFI sensing. Its internal logic implements switchover control using VDD/VBAT comparison and threshold crossing detection, with propagation delays under 5 µs for PFI→PFO and 140 ms max for VDD→RESET assertion.
It employs PMOS pass transistors for VDD→VOUT (rDS(on) ≤1 Ω) and NMOS for VBAT→VOUT (rDS(on) = 8–15 Ω), enabling low-dropout backup operation while preventing reverse current flow. The device supports manual reset via MR pin (with 100 ns/V input transition rate tolerance) and includes internal timer-based reset debouncing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Reset Threshold (VIT) | 4.55 V (typical); ensures reliable microcontroller reset at 5-V system brownout before data corruption occurs |
| VBAT Supply Current | 100 nA (max); enables multi-year RAM retention on coin-cell batteries without significant discharge |
| VDD Supply Current | 40 µA (max); minimizes primary supply loading in always-on monitoring applications |
| Power-On Reset Delay | Fixed 100 ms; guarantees sufficient time for power rail stabilization and processor initialization |
| PFI Reference Voltage | 1.15 V (typical); allows configurable power-fail detection of any supply via resistor divider |
| VBAT-to-VOUT rDS(on) | 15 Ω (typical); limits voltage drop to <225 mV at 15 mA, preserving RAM write margin during switchover |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive cabin environments without derating |
Pinout & Package
VSSOP-8 (DGK) package, 3.05 mm × 4.98 mm footprint, 1.1 mm max height, MSOP-compatible with exposed thermal pad (non-electrical). Pin 1 index area marked; RoHS-compliant NiPdAu lead finish; MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Output power rail | Switched output connected to VDD or VBAT based on supply status; drives RAM VCC directly |
| VDD (Pin 2) | Main supply input | Primary 5-V system supply; powers internal circuitry and enables VDD→VOUT path when above VIT |
| GND (Pin 3) | Ground reference | Common return for all analog/digital functions; requires low-impedance connection to minimize noise on RESET/PFO |
| PFI (Pin 4) | Power-fail input | Analog comparator input referenced to 1.15 V; used with external resistor divider to detect auxiliary supply failure |
| PFO (Pin 5) | Power-fail output | Active-low open-drain signal indicating PFI voltage below threshold; requires pull-up for system interrupt generation |
| MR (Pin 6) | Manual reset input | Active-low asynchronous reset trigger; debounced internally; overrides automatic reset timing |
| RESET (Pin 7) | Reset output | Active-low push-pull reset signal with VDD-rail referenced VOH/VOL; directly interfaces microcontroller reset pin |
| VBAT (Pin 8) | Backup battery input | Connects to lithium cell (e.g., 3.6 V); automatically engages when VDD falls below VIT and VBAT > VDD |
Key Features
| Feature | Design Value |
|---|---|
| Backup-battery switchover | Automatic VDD/VBAT selection with no external FETs or control logic required |
| Precision voltage monitoring | ±1.5% VIT accuracy over temperature ensures consistent reset point across operating range |
| Ultra-low battery drain | 100 nA max VBAT current preserves 220 mAh coin-cell life beyond 70 years in standby |
| Integrated power-fail detection | Dedicated PFI/PFO path with 12 mV hysteresis prevents chatter during marginal supply transitions |
| Fixed-reset timing | 100-ms factory-trimmed delay eliminates need for external RC timing components |
| Wide supply range | Operates with VDD from 1.65 V to 5.5 V and VBAT from 1.5 V to 5.5 V, supporting mixed-voltage systems |
Applications
| Portable Medical Monitors | Fax Machines |
|---|---|
Use Scenario: Continuous ECG waveform logging with volatile buffer memory during AC power interruption. IC Role / Device Role / Timing Role: Supervises main 5-V supply and switches RAM to 3.6-V lithium backup within 10 µs of brownout detection. Use Value: Prevents loss of 30+ seconds of diagnostic data by maintaining RAM VCC at ≥4.75 V during 200-ms outage. |
Use Scenario: Preserving fax memory contents (phone numbers, dial logs, unsent pages) during brief line power dips. IC Role / Device Role / Timing Role: Generates clean 100-ms RESET pulse on power-up and asserts PFO to trigger firmware save routine before VDD collapse. Use Value: Eliminates need for EEPROM writes on every keypress, reducing flash wear and extending product lifetime. |
| Automotive Infotainment | Point-of-Sale Terminals |
Use Scenario: Retaining user presets and navigation history in head-unit during engine cranking (12-V battery sag to 6 V). IC Role / Device Role / Timing Role: Detects VDD drop below 4.46 V and activates VBAT path before microcontroller enters reset state. Use Value: Enables instant resume after ignition without reinitializing Bluetooth pairing or radio station list. |
Use Scenario: Safeguarding transaction buffers and encryption keys during mains failure in retail payment terminals. IC Role / Device Role / Timing Role: Uses PFI to monitor 3.3-V LDO output feeding secure element; asserts PFO to initiate AES key flush before power loss. Use Value: Meets PCI PTS v6.0 requirement for zero-key-exposure during uncontrolled power-down events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backup-battery supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3619-50DGKR | Includes battery freshness seal; lacks VBAT > VDD switchover capability; identical VIT and package | Designed for sealed products where battery must remain disconnected until first power-on | Select when long-term shelf life (>5 years) with unpowered backup cell is mandatory |
| MAX704CPA+ | 5-V fixed reset only; no PFI/PFO; no VBAT switchover; DIP-8 package; higher 20-µA quiescent current | Legacy replacement for simple reset-only functions without RAM backup requirements | Select only for cost-sensitive, non-battery-backed designs where PCB layout allows through-hole mounting |
Compared with TPS3620-50DGKR, TPS3619-50DGKR adds battery isolation but removes critical VBAT>VDD support, while MAX704CPA+ omits both switchover and power-fail detection - making TPS3620-50DGKR uniquely suited for modern RAM-retention systems requiring autonomous dual-supply management.
Availability
TPS3620-50DGKR is available at Aetrix Electronics and suitable for portable medical monitors, automotive infotainment systems, and point-of-sale terminals requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TPS3620-50DGKR 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 connectivity technologies, with over 50 years of innovation in power management and precision analog ICs.
The TPS36xx family was designed specifically for backup-battery supervision in CMOS RAM applications, emphasizing ultra-low battery current, precise reset thresholds, and seamless switchover - addressing reliability gaps in legacy supervisors.
FAQ
What is the exact reset threshold voltage for TPS3620-50DGKR?
The TPS3620-50DGKR has a nominal reset threshold (VIT) of 4.55 V, with a guaranteed range of 4.46 V to 4.64 V over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS387H datasheet. The TPS3620-50DGKR uses this threshold to assert RESET when VDD falls below VIT and release it only after VDD rises above VIT plus hysteresis.
Can TPS3620-50DGKR support a 3.6-V lithium backup battery while the main supply is 5 V?
Yes, the TPS3620-50DGKR explicitly supports VBAT > VDD operation. When VDD drops below VIT (4.46–4.64 V), the device connects VBAT to VOUT if VBAT exceeds VDD - enabling use of standard 3.6-V lithium cells even with a 5-V main rail. This behavior is confirmed in the Functional Block Diagram, Timing Diagram, and Table 1 Function Table of the TPS3620-50DGKR datasheet.
Does TPS3620-50DGKR require external components for basic reset functionality?
No, the TPS3620-50DGKR requires no external components for core reset operation. Its 100-ms power-on reset delay is internal and factory-trimmed. Only optional components are needed: a 0.1-µF bypass capacitor on VDD/GND (recommended for stability), pull-up resistors on PFO/RESET if interfacing with open-drain inputs, and resistor dividers on PFI for custom power-fail detection thresholds.
How does the PFI/PFO function work in TPS3620-50DGKR?
The PFI pin connects to an internal 1.15-V comparator reference. When the voltage at PFI falls below 1.15 V (±12 mV hysteresis), PFO goes low. This allows monitoring of auxiliary supplies (e.g., 3.3-V LDO) using a resistor divider. For example, connecting PFI to a 2:1 divider across a 3.3-V rail triggers PFO at ~2.3 V. The TPS3620-50DGKR datasheet specifies VPFI = 1.15 V typical with 12 mV hysteresis in the Electrical Characteristics table.
What is the maximum continuous output current capability of TPS3620-50DGKR's VOUT pin?
The TPS3620-50DGKR supports up to 300 mA continuous output current at VOUT in normal mode (VDD powering VOUT), with VOL ≤ 0.4 V at 3 mA sink. In battery-backup mode (VBAT powering VOUT), it delivers up to 7.5 mA with VOUT = VBAT – 113 mV (typical). These values are specified in the "Electrical Characteristics" section under "Continuous output current at VOUT, IO" and "VOUT" parameters in the SLVS387H datasheet.
TPS3620-50DGKR 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:
- 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
TPS3620-50DGKR FAQ
1.How can I place an order for TPS3620-50DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3620-50DGKR 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 TPS3620-50DGKR reliable?
The price and inventory of TPS3620-50DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3620-50DGKR is usually 5 days.
3.What payment methods are accepted for TPS3620-50DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3620-50DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3620-50DGKR?
TPS3620-50DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3620-50DGKR 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 TPS3620-50DGKR?
For technical support, including TPS3620-50DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3620-50DGKR requirements.
6.How does Aetrix verify that TPS3620-50DGKR is sourced from the original manufacturer or authorized distributors?
All TPS3620-50DGKR 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 TPS3620-50DGKR meets industry standards.
7.What is the process for return or replacement of TPS3620-50DGKR?
All TPS3620-50DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3620-50DGKR, 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 TPS3620-50DGKR part is unused and in its original packaging.
Return procedure for TPS3620-50DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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