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Texas Instruments TPS3606-33DGS
- Part No.:
- TPS3606-33DGS
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3606-33DGS.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
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Product details
Overview
TPS3606-33DGS from Texas Instruments is a precision 3.3-V supply voltage supervisor IC with integrated watchdog timer, battery switchover control, and power-fail monitoring. It delivers 40 µA max supply current, features a fixed 100-ms reset delay, and supports manual reset and battery freshness seal for portable equipment requiring reliable brownout protection and seamless backup power transition.
For engineers reviewing the TPS3606-33DGS datasheet, TPS3606-33DGS pinout, TPS3606-33DGS application, or TPS3606-33DGS equivalent, this device is selected for systems demanding precise 3.3-V threshold supervision, low-power operation, deterministic reset timing, and dual-supply (VDD/VBAT) management in space-constrained designs.
Technical Context
The TPS3606-33DGS implements a dual-path power supervision architecture: one path monitors VOUT against a 2.93-V nominal threshold (±3% over temperature) to assert active-low RESET, while a second independent comparator monitors PFI against a 1.15-V reference for external power-fail detection. Its internal switch enables automatic or manual switchover between VDD and VBAT supplies using a 2-Ω on-resistance MOSFET.
It integrates an 800-ms watchdog timer with edge-triggered WDI input, a battery freshness seal that isolates VBAT until first power-up, and a dedicated MSWITCH input to force immediate battery-backup mode. All logic operates across −40°C to 85°C with VDD and VBAT rated from 1.65 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Threshold | 2.93 V ±3% - precisely monitors 3.3-V rails for brownout detection without external resistors |
| Reset Delay Time | 100 ms fixed - ensures stable processor initialization after power-up or recovery |
| Watchdog Timeout | 800 ms typical - provides deterministic firmware execution monitoring with edge-triggered reset |
| VDD Supply Current | 40 µA max - enables long battery life in always-on portable and monitoring systems |
| VDD-to-VOUT rDS(on) | 1–2 Ω - minimizes voltage drop and power loss during main supply operation |
| VBAT-to-VOUT rDS(on) | 1–2 Ω - maintains low-loss backup power delivery even at 75 mA load |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
TPS3606-33DGS is housed in a 10-pin VSSOP (DGS) package measuring 3.05 mm × 4.98 mm × 1.1 mm max height, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Power output | Regulated supply output sourced from VDD or VBAT; delivers up to 200 mA with <2 Ω on-resistance |
| GND | Ground reference | Common return path for all internal circuits and output current; requires low-impedance PCB connection |
| VDD | Main supply input | Primary system power input (1.65–5.5 V); powers internal circuitry and sources VOUT when active |
| MSWITCH | Manual switchover control | Active-high input forcing immediate transition to battery-backup mode regardless of VDD status |
| PFI | Power-fail comparator input | Analog input referenced to 1.15 V; used with external resistor divider to monitor auxiliary voltages |
| PFO | Power-fail comparator output | Open-drain output asserting low when PFI falls below 1.15 V; includes 12 mV hysteresis |
| RESET | Active-low reset signal | Asserts low during power-up, brownout, or manual reset; 100-ms delay ensures clean processor boot |
| VBAT | Backup battery input | Accepts 1.5–5.5 V battery source; automatically engages when VDD fails and VBAT > VDD |
| MR | Manual reset input | Active-low asynchronous reset trigger; debounced internally for noise immunity |
| WDI | Watchdog timer input | Edge-sensitive input requiring low-to-high or high-to-low transition every 800 ms to prevent timeout |
Key Features
| Feature | Design Value |
|---|---|
| Battery Freshness Seal | Disables VBAT connection until first power-up, preserving shelf life of installed lithium backup cells |
| Automatic Backup Switchover | Engages VBAT when VOUT drops below VSWN (≈2.96 V) and VBAT > VDD - no software or external logic required |
| Low-Power Watchdog Operation | Supports ultra-low-current WDI drive: hold low for 7/8 timeout, then pulse once to reset - avoids 125 µA leakage |
| Independent Power-Fail Monitoring | Dedicated PFI/PFO pair with 1.15-V reference enables supervision of non-3.3-V rails (e.g., 5-V, 12-V) via resistor network |
| High-Accuracy Threshold | 2.93-V VIT with ±3% tolerance over −40°C to +85°C ensures robust margin against 3.3-V rail variation |
Applications
| Fax Machines | Set-Top Boxes |
|---|---|
Use Scenario: Maintains real-time clock and memory during AC power interruption using onboard lithium battery. IC Role / Device Role / Timing Role: Supervisory controller managing VDD/VBAT switchover, generating reset pulse, and monitoring power-fail condition. Use Value: Prevents data corruption and ensures instant resume after brief outages without requiring user intervention or firmware reinitialization. |
Use Scenario: Ensures reliable boot sequence and firmware integrity after cold start or unexpected power loss. IC Role / Device Role / Timing Role: Precision 3.3-V supervisor providing 100-ms reset assertion and watchdog supervision of media processor. Use Value: Eliminates boot hangs and silent crashes by enforcing deterministic reset timing and detecting stalled code execution. |
| Portable Battery-Powered Equipment | Automotive Systems |
Use Scenario: Powers microcontroller and sensors from primary battery, seamlessly switching to backup cell during deep discharge. IC Role / Device Role / Timing Role: Dual-supply supervisor with battery freshness seal and manual switchover for field-deployable instrumentation. Use Value: Extends usable battery life by minimizing quiescent current (40 µA) and preserves backup energy until actual need arises. |
Use Scenario: Monitors 3.3-V domain in infotainment head unit during engine cranking-induced voltage sag. IC Role / Device Role / Timing Role: High-reliability voltage supervisor with −40°C to +85°C rating and fast propagation delay (<5 µs). Use Value: Guarantees continuous operation through 6-V brownouts and prevents false resets during transient load dumps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33DBVR | Single-supply only (VDD only), no VBAT switchover; 3.3-V threshold, 200-ms reset delay | Lacks battery backup capability; suitable for fixed-rail systems without backup power requirement | Select when cost and footprint are prioritized over dual-supply functionality |
| MAX6326UT33+T | 3.3-V supervisor with 140-ms reset delay; no watchdog or battery switchover; SOT23-5 package | Smaller footprint but omits PFI/PFO, MSWITCH, and WDI - limited to basic reset generation | Choose for simple reset-only applications where board area is critical and advanced features are unnecessary |
Compared with TPS3606-33DGS, TPS3823-33DBVR reduces complexity and cost but removes battery switchover and watchdog functions, while MAX6326UT33+T offers minimal footprint at the expense of supervision flexibility and dual-supply support.
Availability
TPS3606-33DGS is available at Aetrix Electronics and suitable for fax machines, set-top boxes, portable battery-powered equipment, and automotive systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for TPS3606-33DGS 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and low-power design.
The TPS3606 family is engineered for intelligent power supervision in portable and industrial systems, integrating voltage monitoring, watchdog timing, and battery switchover into a single compact IC to simplify power architecture design.
FAQ
What is the exact reset threshold voltage of the TPS3606-33DGS?
The TPS3606-33DGS has a nominal negative-going input threshold voltage (VIT) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V across −40°C to +85°C. This value is factory-trimmed and specified in the electrical characteristics table of the SLVS335C datasheet. The TPS3606-33DGS uses this threshold to monitor VOUT and assert RESET when the supply falls below the trip point.
Does the TPS3606-33DGS support automatic switchover to backup battery?
Yes, the TPS3606-33DGS supports automatic switchover to VBAT when VOUT drops below the switch-negative threshold (VSWN, typically ≈2.96 V) and VBAT exceeds VDD. It uses an internal 2-Ω MOSFET switch to connect VBAT to VOUT, enabling uninterrupted operation of downstream circuitry. The TPS3606-33DGS also allows manual override via the MSWITCH pin.
How does the watchdog timer in the TPS3606-33DGS operate?
The TPS3606-33DGS watchdog timer has an 800-ms typical timeout period and is triggered by any edge (low-to-high or high-to-low) on the WDI pin. If no transition occurs within the timeout window, RESET is asserted. For lowest current consumption, the TPS3606-33DGS recommends holding WDI low for 7/8 of the period and pulsing once - avoiding continuous high-state current draw.
Can the TPS3606-33DGS monitor voltages other than 3.3 V?
Yes, the TPS3606-33DGS includes a dedicated PFI input referenced to a 1.15-V internal comparator. By connecting an external resistor divider from the target voltage rail to PFI, users can supervise any voltage above 1.15 V - for example, 5-V or 12-V supplies. The TPS3606-33DGS PFO output asserts low when the divided voltage falls below the threshold.
What package type and dimensions does the TPS3606-33DGS use?
The TPS3606-33DGS is packaged in a 10-pin VSSOP (DGS) with body dimensions of 3.05 mm × 4.98 mm and maximum height of 1.1 mm. It features a 0.5-mm pin pitch and is RoHS-compliant with NIPDAU lead finish. The TPS3606-33DGS is rated for moisture sensitivity level 1 and supports standard reflow profiles up to 260°C peak.
TPS3606-33DGS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- 10-VSSOP
TPS3606-33DGS FAQ
1.How can I place an order for TPS3606-33DGS through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3606-33DGS 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 TPS3606-33DGS reliable?
The price and inventory of TPS3606-33DGS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3606-33DGS is usually 5 days.
3.What payment methods are accepted for TPS3606-33DGS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3606-33DGS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3606-33DGS?
TPS3606-33DGS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3606-33DGS 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 TPS3606-33DGS?
For technical support, including TPS3606-33DGS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3606-33DGS requirements.
6.How does Aetrix verify that TPS3606-33DGS is sourced from the original manufacturer or authorized distributors?
All TPS3606-33DGS 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 TPS3606-33DGS meets industry standards.
7.What is the process for return or replacement of TPS3606-33DGS?
All TPS3606-33DGS units undergo pre-shipment inspection (PSI). If there is an issue with TPS3606-33DGS, 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 TPS3606-33DGS part is unused and in its original packaging.
Return procedure for TPS3606-33DGS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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