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Texas Instruments TPS3617-50DGKG4
- Part No.:
- TPS3617-50DGKG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3617-50DGKG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,598
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Product details
Overview
TPS3617-50DGKG4 from Texas Instruments is a battery-backup supervisor IC for RAM retention in 5-V systems, featuring precision 4.55-V supply monitoring, 800-ms watchdog timeout, 100-ms power-on reset delay, active-low push-pull RESET output, and VDD-to-VBAT switchover with <1-Ω on-resistance. It operates across –40°C to +85°C and supports portable equipment requiring nonvolatile data preservation during main supply failure.
For engineers reviewing the TPS3617-50DGKG4 datasheet, TPS3617-50DGKG4 pinout, TPS3617-50DGKG4 application, or TPS3617-50DGKG4 equivalent, key selection considerations include VIT accuracy (±1.9% over temperature), battery current consumption (<100 nA), PFI/PFO low-battery detection capability, WDI watchdog interface timing, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The TPS3617-50DGKG4 integrates dual-path power switching logic: a precision comparator monitors VDD against 4.55-V threshold (VIT) to control VOUT routing between VDD and VBAT, while an independent 1.15-V reference drives the PFI/PFO comparator for auxiliary voltage supervision. Its internal watchdog timer resets on any WDI edge transition within 0.8 s, with propagation delays under 5 µs for RESET assertion.
Switchover behavior includes hysteresis: VBSW hysteresis is 55 mV at VDD = 1.8 V, and VIT hysteresis is 40 mV over 2.5–3.5 V range. The device uses PMOS pass transistors - 1 Ω max (VDD→VOUT) and 15 Ω typical (VBAT→VOUT) - enabling efficient backup power delivery up to 300 mA continuous output current without external FETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT Threshold | 4.55 V ±30 mV (guaranteed trip point ensures reliable 5-V supply brownout detection) |
| Supply Current (IDD) | 40 µA max (enables >1-year battery life in always-on backup mode) |
| Battery Current (IBAT) | 100 nA max (minimizes self-discharge of lithium coin cells during long-term storage) |
| Watchdog Timeout | 800 ms ±320 ms (configurable via WDI toggling; prevents system lockup without software intervention) |
| Power-On Reset Delay | 100 ms fixed (ensures stable initialization of microcontrollers before release) |
| VDD→VOUT RDS(on) | 1 Ω max (limits voltage drop to ≤300 mV at 300 mA, preserving RAM VCC margin) |
| PFI Threshold | 1.15 V ±20 mV (supports external resistor-divider supervision of auxiliary rails down to 1.15 V) |
Pinout & Package
TPS3617-50DGKG4 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. The exposed pad is not electrically connected per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Power output | Switched supply rail delivering either VDD or VBAT to RAM; capable of 300 mA continuous load |
| VDD (Pin 2) | Main supply input | Primary 5-V system rail input; monitored for reset generation and switchover control |
| GND (Pin 3) | Ground reference | Common return path for all internal circuits and output drivers |
| PFI (Pin 4) | Power-fail input | Analog input for external voltage monitoring; triggers PFO when <1.15 V |
| PFO (Pin 5) | Power-fail output | Active-low push-pull signal indicating auxiliary supply fault condition |
| WDI (Pin 6) | Watchdog input | Edge-sensitive trigger; requires transition every ≤800 ms to prevent RESET assertion |
| RESET (Pin 7) | Reset output | Active-low push-pull output with 100-ms POR delay and fast 2–5 µs propagation |
| VBAT (Pin 8) | Battery input | Backup source (1.5–5.5 V); automatically engaged when VDD falls below VIT |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | Disables VBAT connection until first power-up, preserving shelf-life of installed backup cell |
| VDD/VBAT switchover logic | Automatic seamless transfer with no external components; supports VBAT > VDD operation |
| Low-quiescent-current design | 40 µA VDD supply current enables use in energy-critical portable applications |
| Dual independent comparators | Separate VDD monitor (4.55 V) and PFI monitor (1.15 V) allow concurrent primary/auxiliary rail supervision |
| Watchdog timer with edge-triggered input | Accepts rising or falling edges on WDI; eliminates need for precise pulse-width generation |
Applications
| Portable Data Loggers | Fax Machines |
|---|---|
|
Use Scenario: Long-duration field deployment where main power may be intermittent and RAM must retain sensor timestamps and configuration. IC Role / Device Role / Timing Role: Supervises 5-V system rail and switches RAM supply to lithium backup cell during outages; asserts RESET to halt CPU until stable power returns. Use Value: Enables >10-year data retention using CR2032 battery with <100 nA quiescent draw, eliminating need for supercapacitors or complex power management ICs. |
Use Scenario: Standby mode operation with volatile memory holding dialing history and user settings across AC power cycles. IC Role / Device Role / Timing Role: Monitors VDD for brownouts, triggers immediate VOUT switchover to VBAT, and holds RESET active for 100 ms after recovery to ensure clean MCU restart. Use Value: Prevents corruption of stored phone numbers and fax parameters during brief line interruptions, meeting IEC 61000-4-11 immunity requirements. |
| Point-of-Sale Terminals | Advanced Modems |
|
Use Scenario: Transaction rollback protection requiring EEPROM write completion confirmation before power loss. IC Role / Device Role / Timing Role: Generates early warning via PFO when auxiliary 3.3-V rail dips, allowing firmware to abort writes and enter safe state before VDD collapse. Use Value: Reduces risk of partial transaction commits by providing 1.15-V fail-safe detection 200 ms before main supply dropout. |
Use Scenario: DSL/cable modem maintaining PPP session state and MAC address table during brief AC dips. IC Role / Device Role / Timing Role: Uses WDI to detect DSP firmware hang; asserts RESET if no activity detected for 800 ms, forcing controlled reboot without manual intervention. Use Value: Eliminates "ghost connection" failures by ensuring modem recovers autonomously within 1.2 s of watchdog timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-backup supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3618-50DGKT | Same functional block diagram but rated for –40°C to +125°C junction temperature; PFI threshold identical (1.15 V), VIT identical (4.55 V) | Required for automotive under-hood or industrial high-temp environments where ambient exceeds +85°C | Select TPS3618-50DGKT when extended temperature operation is mandatory; pinout and footprint are identical. |
| MAX6361LKA29+T | 2.93-V fixed reset threshold; no PFI/PFO pins; no watchdog; 1.2-µA quiescent current; SC70-5 package | Suitable only for basic reset-only applications without battery switchover or auxiliary monitoring | Choose MAX6361LKA29+T only if system lacks backup battery and requires ultra-low IDD (<2 µA); not a functional substitute for TPS3617-50DGKG4. |
Compared with TPS3617-50DGKG4, TPS3618-50DGKT offers identical supervision functionality with extended temperature rating, while MAX6361LKA29+T provides minimal reset capability in a smaller package but omits battery switchover, watchdog, and PFI/PFO - making it unsuitable for RAM-retention designs.
Availability
TPS3617-50DGKG4 is available at Aetrix Electronics and suitable for portable battery-powered equipment, point-of-sale terminals, and advanced modems requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for TPS3617-50DGKG4 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 company headquartered in Dallas, Texas, designing analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The TPS3617 family was developed specifically for battery-backed RAM retention in space-constrained portable electronics, emphasizing ultra-low IBAT, precise VIT tolerance, and integrated switchover logic to eliminate discrete MOSFETs and external timing components.
FAQ
What is the exact VIT threshold voltage for TPS3617-50DGKG4 and how tightly is it specified?
The TPS3617-50DGKG4 has a nominal VIT threshold of 4.55 V, with a guaranteed range of 4.46 V to 4.55 V over –40°C to +85°C. This ±30 mV tolerance ensures deterministic reset activation during 5-V supply brownouts without false triggering, and is validated per TI's SLVS339D datasheet Electrical Characteristics table.
Does TPS3617-50DGKG4 support VBAT voltages higher than VDD, and what is the maximum allowed VBAT?
Yes, TPS3617-50DGKG4 explicitly supports VBAT > VDD operation, with VBAT rated from 1.5 V to 5.5 V. When VDD drops below VIT, VOUT switches to VBAT even if VBAT exceeds VDD - a key feature enabling use of standard 3.6-V lithium batteries in 5-V systems without level-shifting circuitry.
How does the watchdog function work on TPS3617-50DGKG4, and what happens if WDI is left unconnected?
The TPS3617-50DGKG4 watchdog requires a rising or falling edge on WDI every 800 ms to prevent RESET assertion. If WDI is left floating, internal pull-down holds it low, disabling the watchdog - confirmed in TI's datasheet Section "DETAILED DESCRIPTION". No external pull-up is needed.
What is the purpose of the battery freshness seal in TPS3617-50DGKG4, and how is it activated?
The battery freshness seal in TPS3617-50DGKG4 disconnects VBAT from internal circuitry until first power-up, preventing premature discharge during shelf life. It is disabled automatically by the positive-going edge of RESET when VDD rises above VIT - no manual enable sequence is required in normal operation.
Can TPS3617-50DGKG4 drive a 300-mA RAM load continuously, and what is the worst-case voltage drop at VOUT?
Yes, TPS3617-50DGKG4 supports 300 mA continuous output current at VOUT. In VDD-mode, worst-case RDS(on) is 1 Ω, yielding ≤300 mV drop at 300 mA; in VBAT-mode, typical RDS(on) is 15 Ω, so at 300 mA the drop is ≤4.5 V - meaning VBAT must be ≥5.0 V to maintain ≥0.5 V margin for 3.3-V RAM. This is verified in the Electrical Characteristics table under "VOUT" and "RDS(on)".
TPS3617-50DGKG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS3617-50DGKG4 FAQ
1.How can I place an order for TPS3617-50DGKG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3617-50DGKG4 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 TPS3617-50DGKG4 reliable?
The price and inventory of TPS3617-50DGKG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3617-50DGKG4 is usually 5 days.
3.What payment methods are accepted for TPS3617-50DGKG4?
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TPS3617-50DGKG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3617-50DGKG4 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 TPS3617-50DGKG4?
For technical support, including TPS3617-50DGKG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3617-50DGKG4 requirements.
6.How does Aetrix verify that TPS3617-50DGKG4 is sourced from the original manufacturer or authorized distributors?
All TPS3617-50DGKG4 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 TPS3617-50DGKG4 meets industry standards.
7.What is the process for return or replacement of TPS3617-50DGKG4?
All TPS3617-50DGKG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3617-50DGKG4, 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 TPS3617-50DGKG4 part is unused and in its original packaging.
Return procedure for TPS3617-50DGKG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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