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Texas Instruments TPS3606-33DGSR
- Part No.:
- TPS3606-33DGSR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3606-33DGSR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
TPS3606-33DGSR from Texas Instruments is a precision 3.3-V supply voltage supervisor IC with integrated watchdog timer, backup-battery switchover, manual reset, and power-fail monitoring. It delivers 40 µA max supply current, 100-ms fixed reset delay, and operates across −40°C to 85°C in portable battery-powered equipment requiring reliable brownout protection and seamless battery fallback.
For engineers reviewing the TPS3606-33DGSR datasheet, TPS3606-33DGSR pinout, TPS3606-33DGSR application, or TPS3606-33DGSR equivalent, this page provides verified functional specifications, terminal-level design meaning, real-world use scenarios for low-power embedded systems, and validated alternative options for supply monitoring and backup management.
Technical Context
The TPS3606-33DGSR implements dual-supply supervision with independent VDD and VBAT inputs, enabling automatic switchover to backup power when VOUT drops below V(SWN) (typically 2.96 V). Its internal 800-ms watchdog timer resets on WDI edge transitions and supports low-current operation via controlled WDI drive strategy.
It integrates a precision 2.93-V reset threshold (VIT) with ±60 mV hysteresis, a 1.15-V power-fail comparator (PFI/PFO), and a battery freshness seal that isolates VBAT until first power-up. The device uses a 2-Ω internal MOSFET switch for VDD-to-VOUT and VBAT-to-VOUT paths, supporting up to 300 mA continuous output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - supports wide-input systems including 1.8-V, 3.3-V, and 5-V rails without external regulation |
| Reset Threshold (VIT) | 2.93 V (typ), ±60 mV hysteresis - ensures stable reset assertion/deassertion during supply ramp-up and brownout recovery |
| Watchdog Timeout | 800 ms (typ), 480–1120 ms range - provides sufficient margin for firmware execution loops while preventing spurious timeouts |
| VDD Supply Current | 40 µA (max) at VOUT = VDD - enables multi-year battery life in always-on monitoring applications |
| Output Drive Capability | 2 mA sink @ 0.4 V (RESET), 80 µA source @ VOUT − 0.4 V (PFO) - directly interfaces with microcontroller reset and interrupt pins |
| Switchover On-Resistance | 2 Ω (max) VDD→VOUT and VBAT→VOUT - limits voltage drop to ≤150 mV at 75 mA, preserving system rail integrity during switchover |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin environments without derating |
Pinout & Package
TPS3606-33DGSR is housed in a 10-pin VSSOP (DGS) package measuring 3.05 mm × 4.98 mm × 1.1 mm max height, optimized for space-constrained portable designs. The MSOP variant is functionally identical and pin-compatible per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Power output | Regulated supply output sourced from VDD or VBAT; connects to processor VCC via low-Rds(on) internal switch |
| GND | Ground reference | Common return path for all internal circuits and external decoupling; must be low-impedance for noise immunity |
| MR | Manual reset input | Active-low asynchronous reset trigger; pulls RESET low when asserted, overriding all other conditions |
| MSWITCH | Manual switchover control | Forces immediate transition to battery-backup mode regardless of VDD status; tied low if unused |
| PFI | Power-fail comparator input | Monitors auxiliary voltage (e.g., 5-V rail) against 1.15-V internal reference; enables secondary supply monitoring |
| PFO | Power-fail comparator output | Open-drain active-low flag indicating PFI < 1.15 V; requires external pull-up for host MCU interrupt signaling |
| RESET | Supervisor reset output | Active-low open-drain reset signal with 100-ms delay; asserts during power-up, brownout, or MR activation |
| VBAT | Backup battery input | Accepts 1.5–5.5 V lithium or coin-cell sources; isolated by freshness seal until first power cycle |
| VDD | Main supply input | Primary 1.65–5.5 V system rail; powers internal circuitry and feeds VOUT unless switchover occurs |
| WDI | Watchdog timer input | Edge-sensitive input; toggling within 800 ms prevents timeout-induced RESET assertion; high-impedance when floating |
Key Features
| Feature | Design Value |
|---|---|
| Battery Freshness Seal | Disables VBAT connection until first power-up, preserving shelf life of backup cells in shipped products |
| Automatic Backup Switchover | Switches VOUT from VDD to VBAT within microseconds when VOUT falls below V(SWN), avoiding reset assertion |
| Programmable Power-Fail Monitoring | PFI input accepts externally scaled voltages (e.g., 5 V via resistor divider), enabling multi-rail fault detection |
| Low-Power Watchdog Operation | WDI current minimized to <150 µA by driving low for 7/8 of timeout period, extending battery runtime |
| Fixed 100-ms Reset Delay | Guarantees clean processor initialization after VOUT exceeds VIT, eliminating need for external RC timing |
Applications
| Portable Medical Monitors | Fax Machines |
|---|---|
Use Scenario: Long-term ambulatory ECG logging powered by primary Li-ion with coin-cell backup. IC Role / Device Role / Timing Role: Supervisor ensures uninterrupted data capture during AC loss by switching to backup without resetting MCU. Use Value: Prevents data loss and preserves real-time clock state during >24-hour battery switchover events. |
Use Scenario: Standby-mode fax with instant wake-on-ring and memory retention during power outage. IC Role / Device Role / Timing Role: Maintains SRAM and RTC power via VBAT while asserting RESET only on deep brownout. Use Value: Enables zero-latency resume from standby without reinitialization or configuration reload. |
| Point-of-Sale Terminals | Automotive Infotainment |
Use Scenario: Battery-backed transaction logging in retail kiosks with intermittent AC power. IC Role / Device Role / Timing Role: Monitors main 5-V rail and triggers switchover before EEPROM write corruption occurs. Use Value: Guarantees atomic commit of payment records even during sudden mains failure. |
Use Scenario: Head unit retaining settings and GPS lock during engine cranking voltage dip. IC Role / Device Role / Timing Role: Detects VDD sag below 2.93 V and activates VBAT path before MCU brownout reset. Use Value: Avoids UI reboot and preserves Bluetooth pairing state during 6–10 V cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply supervision and backup management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3619-33DGSR | Includes 200-ms programmable reset delay (vs fixed 100 ms); same VIT, watchdog, and switchover architecture | Better suited for systems requiring longer reset hold time for complex peripherals (e.g., DDR initialization) | Select when precise reset timing control is needed beyond 100 ms; otherwise TPS3606-33DGSR offers lower cost and simpler BOM |
| MAX6361KA33+T | Lower quiescent current (12 µA vs 40 µA); no battery switchover or watchdog; 3.08-V reset threshold | Limited to basic reset generation in ultra-low-power devices without backup requirements | Choose only for cost-sensitive, non-switchover applications where 210-mV higher VIT tolerance is acceptable |
Compared with TPS3606-33DGSR, TPS3619-33DGSR adds configurability at minor cost premium, while MAX6361KA33+T sacrifices switchover and watchdog functionality for ultra-low current-making it unsuitable as direct replacement in battery-fallback systems.
Availability
TPS3606-33DGSR is available at Aetrix Electronics and suitable for portable medical monitors, point-of-sale terminals, automotive infotainment systems, and fax machines requiring stable component supply with long-term lifecycle support.
Supply support for TPS3606-33DGSR 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 IC design.
The TPS3606 family was engineered specifically for battery-critical applications demanding seamless primary-to-backup power transition, precision reset timing, and integrated watchdog supervision in compact portable systems.
FAQ
What is the exact reset threshold voltage of the TPS3606-33DGSR?
The TPS3606-33DGSR has a nominal reset threshold (VIT) of 2.93 V, with guaranteed minimum 2.87 V and maximum 2.99 V across temperature and process variation. This 3.3-V nominal rating ensures reliable detection of brownout conditions on standard 3.3-V rails while maintaining adequate noise margin.
Does the TPS3606-33DGSR support automatic switchover to backup battery without asserting RESET?
Yes, the TPS3606-33DGSR supports seamless automatic switchover: when VOUT falls below V(SWN) (typically 2.96 V) and VBAT exceeds VDD, it connects VBAT to VOUT through a 2-Ω switch without asserting the RESET signal-preserving processor state and enabling uninterrupted operation in TPS3606-33DGSR-based systems.
How does the watchdog timer in the TPS3606-33DGSR function, and what is its timeout period?
The TPS3606-33DGSR watchdog timer has a typical timeout of 800 ms, with a specified range of 480–1120 ms. It resets on any edge (low-to-high or high-to-low) at the WDI pin. If left unconnected, the watchdog is internally disabled-ensuring predictable behavior in systems not requiring watchdog supervision.
Can the TPS3606-33DGSR monitor a secondary voltage like a 5-V rail using the PFI pin?
Yes, the PFI pin accepts externally scaled voltages. Using two 1% resistors forming a divider (e.g., 3.6 MΩ and 1.4 MΩ), a 5-V rail can be reduced to 1.15 V for comparison against the internal reference. The PFO output then flags undervoltage on that rail independently of the main 3.3-V supply monitored by TPS3606-33DGSR.
What is the purpose of the battery freshness seal in the TPS3606-33DGSR, and how is it activated?
The battery freshness seal disconnects VBAT from internal circuitry until first power application, preventing premature discharge of backup cells during storage. It is activated by grounding PFO while powering VDD and VBAT, then deactivating MR-after which the seal releases on the next positive-going RESET edge during normal operation of TPS3606-33DGSR.
TPS3606-33DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 10-VSSOP
TPS3606-33DGSR FAQ
1.How can I place an order for TPS3606-33DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3606-33DGSR 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 TPS3606-33DGSR reliable?
The price and inventory of TPS3606-33DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3606-33DGSR is usually 5 days.
3.What payment methods are accepted for TPS3606-33DGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3606-33DGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3606-33DGSR?
TPS3606-33DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3606-33DGSR 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 TPS3606-33DGSR?
For technical support, including TPS3606-33DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3606-33DGSR requirements.
6.How does Aetrix verify that TPS3606-33DGSR is sourced from the original manufacturer or authorized distributors?
All TPS3606-33DGSR 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 TPS3606-33DGSR meets industry standards.
7.What is the process for return or replacement of TPS3606-33DGSR?
All TPS3606-33DGSR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3606-33DGSR, 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 TPS3606-33DGSR part is unused and in its original packaging.
Return procedure for TPS3606-33DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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