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Analog Devices Inc. LTC1728ES5-2.5#TRPBF
- Part No.:
- LTC1728ES5-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-2.5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,115
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Product details
Overview
LTC1728ES5-2.5#TRPBF from Analog Devices is a micropower precision triple supply monitor in 5-lead SOT-23 package, designed to supervise 3.3V, 2.5V, and adjustable (1.0V) supplies with ±1.5% threshold accuracy over temperature. It provides a single active-low open-drain RESET output with 200ms delay, guaranteed operation down to 1V on any monitored rail, and consumes only 10µA typical supply current. It is used in portable battery-powered equipment requiring reliable power-up sequencing and brownout detection.
For engineers reviewing the LTC1728ES5-2.5#TRPBF datasheet, LTC1728ES5-2.5#TRPBF pinout, LTC1728ES5-2.5#TRPBF application, or LTC1728ES5-2.5#TRPBF equivalent, key selection criteria include its triple-supply monitoring capability with fixed 3.3V/2.5V thresholds and adjustable 1.0V reference, glitch-immune reset assertion, low-voltage operation guarantee, and SOT-23 footprint for space-constrained designs.
Technical Context
The LTC1728ES5-2.5#TRPBF implements three independent comparators feeding a 200ms reset timer and logic OR gate, asserting RST low until all inputs (VCC3 = 3.3V, VCC25 = 2.5V, VCCA = 1.0V) exceed their respective thresholds. Its internal bandgap reference enables accurate trip points across –40°C to +85°C, and power-detect circuitry ensures RST remains valid even when supply rails drop below 1V.
Unlike the LTC1727, this device omits individual comparator outputs (COMP3, COMP25, COMPA), providing only the common RST signal. The SOT-23 package supports compact integration into portable systems where board area and quiescent current are critical constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC3 Threshold | 3.086V ±1.5% - precise 3.3V rail supervision with minimal false resets during voltage ripple |
| VCC25 Threshold | 2.338V ±1.5% - accurate 2.5V rail monitoring compatible with modern low-voltage logic |
| VCCA Threshold | 1.000V ±1.5% - configurable third-rail monitoring for DC/DC feedback or auxiliary supplies |
| Reset Delay | 200ms - ensures stable power-up before releasing microprocessor reset, meeting standard boot timing requirements |
| Supply Current | 10µA typical - enables use in always-on battery-backed systems without significant drain |
| Min Operating Voltage | 1V on any input - guarantees correct RST state during deep brownout or partial power loss |
| Output Type | Active-low open-drain - allows flexible pull-up to 3.3V, 5V, or other logic levels for system interface compatibility |
Pinout & Package
The LTC1728ES5-2.5#TRPBF is housed in a 5-lead TSOT-23 package (S5), measuring 2.90mm × 1.60mm × 0.95mm, with gull-wing leads and lead-free finish. It features a compact footprint ideal for portable and space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Open-drain output asserted low until all three supplies meet thresholds; requires external pull-up resistor |
| GND (Pin 2) | Ground reference | Common return path for internal comparators and reset logic; must be low-impedance connection |
| VCCA (Pin 3) | Adjustable supply sense input | High-impedance input for monitoring third rail (e.g., DC/DC feedback node); threshold = 1.000V |
| VCC3 (Pin 5) | 3.3V supply sense & power source | Primary power input and 3.3V rail monitor; powers internal circuitry when ≥1V and highest potential rail |
| VCC25/VCC5/VCC18 (Pin 4) | 2.5V supply sense & alternate power source | Monitors 2.5V rail (per -2.5 variant); also serves as secondary power source when > VCC3 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-rail monitoring | Simultaneous supervision of 3.3V, 2.5V, and adjustable 1.0V supplies in one SOT-23 device |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +85°C range, eliminating need for external calibration |
| Glitch-immune reset | Two-stage immunity: 10% hysteresis-like input filtering + 200ms debounce prevents false triggers from noise or transients |
| 1V minimum operating voltage | RST remains valid even if any monitored rail drops to 1V, enabling robust brownout response |
| 10µA typical supply current | Enables multi-year battery life in always-on monitoring applications such as IoT edge nodes |
Applications
| Portable Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Monitoring main 3.3V logic rail, 2.5V I/O rail, and adjustable 1.0V core supply in handheld medical devices. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring safe processor boot and shutdown sequencing. Use Value: Prevents corrupted memory writes and logic lockup by holding reset until all rails stabilize within ±1.5% tolerance. | Use Scenario: Supervising 3.3V system rail, 2.5V DDR interface rail, and 1.0V CPU core rail during AC-to-battery switchover. IC Role / Device Role / Timing Role: Centralized reset generator with 200ms delay aligned to BIOS initialization timing. Use Value: Eliminates need for discrete RC reset circuits, reducing BOM count and improving thermal stability of reset timing. |
| Intelligent Instruments | Network Servers |
Use Scenario: Ensuring clean power-up of FPGA configuration, analog front-end, and communication ICs in portable test equipment. IC Role / Device Role / Timing Role: Power-good arbiter that gates FPGA configuration clock until all supplies reach spec. Use Value: Reduces field failure rate due to marginal supply conditions by enforcing strict 3-rail compliance before release. | Use Scenario: Monitoring redundant 3.3V management rails, 2.5V PHY supplies, and adjustable 1.0V ASIC core rails in blade server modules. IC Role / Device Role / Timing Role: Fail-safe reset initiator that asserts on first rail undervoltage and holds until full recovery. Use Value: Enables hot-swap capability by guaranteeing RST remains asserted during brief supply dips caused by module insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1326-2.5 | ±0.75% threshold accuracy; includes watchdog timer and manual reset input | Supports watchdog timeout and push-button reset - not present in LTC1728ES5-2.5#TRPBF | Select when system-level fault recovery beyond basic reset is required |
| LTC1726-2.5 | Adjustable reset timeout (1ms–10s) and programmable watchdog; higher 25µA supply current | Offers configurable timing and enhanced fault coverage at cost of higher quiescent current | Select when adaptive reset duration or watchdog functionality is needed |
Compared with LTC1326-2.5 and LTC1726-2.5, the LTC1728ES5-2.5#TRPBF delivers the lowest quiescent current (10µA) and smallest footprint (SOT-23), making it optimal for ultra-low-power, space-constrained applications where only fixed 200ms reset timing is required.
Availability
LTC1728ES5-2.5#TRPBF is available at Aetrix Electronics and suitable for portable battery-powered equipment, notebook computers, intelligent instruments, and network servers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1728ES5-2.5#TRPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1728 belongs to Analog Devices' precision power monitoring product line, engineered specifically for reliable, low-power triple-supply supervision in portable and embedded systems where accuracy, small size, and ultra-low current are critical.
FAQ
What is the function of the VCCA pin on the LTC1728ES5-2.5#TRPBF?
The VCCA pin on the LTC1728ES5-2.5#TRPBF is a high-impedance input for monitoring an adjustable third supply rail, with a fixed 1.000V ±1.5% threshold. It can be connected to a DC/DC converter feedback node or auxiliary voltage source. If unused, it may be tied to VCC3 or VCC25; the LTC1728ES5-2.5#TRPBF will still operate correctly as long as VCC3 remains powered.
Does the LTC1728ES5-2.5#TRPBF support monitoring only two supplies?
Yes, the LTC1728ES5-2.5#TRPBF can monitor one or two supplies instead of three. For dual-supply operation, tie the unused VCCA pin to VCC3 or VCC25, and configure the system so only the relevant rails (e.g., VCC3 and VCC25) are actively supervised. The device asserts RST if any monitored supply falls below its threshold.
What is the minimum supply voltage required for the LTC1728ES5-2.5#TRPBF to guarantee correct RST output state?
The LTC1728ES5-2.5#TRPBF guarantees correct RST logic state for VCC3, VCC25, or VCCA ≥ 1V. This means RST remains valid and functional even during deep brownout conditions, ensuring deterministic reset behavior down to 1V on any monitored rail - a key reliability feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Can the LTC1728ES5-2.5#TRPBF be used in automotive applications?
The LTC1728ES5-2.5#TRPBF is rated for –40°C to +85°C operation (E-grade), matching standard industrial temperature requirements. While not AEC-Q200 qualified, it has been deployed in non-safety-critical automotive subsystems such as infotainment and telematics modules where extended temperature performance and low quiescent current are valued. For ASIL-B/C applications, consult Analog Devices' automotive-grade alternatives.
How does the LTC1728ES5-2.5#TRPBF differ from the LTC1727-2.5 variants?
The LTC1728ES5-2.5#TRPBF lacks the individual comparator outputs (COMP3, COMP25, COMPA) present in the LTC1727-2.5, offering only the common RST signal. It uses the same 3.3V/2.5V/1.0V thresholds and 200ms reset delay but occupies a smaller 5-lead SOT-23 package versus the 8-lead MSOP/SO of the LTC1727. This makes the LTC1728ES5-2.5#TRPBF ideal where board space and simplicity are prioritized over per-rail status visibility.
LTC1728ES5-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.338V, 3.086V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC1728ES5-2.5#TRPBF FAQ
1.How can I place an order for LTC1728ES5-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-2.5#TRPBF 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 LTC1728ES5-2.5#TRPBF reliable?
The price and inventory of LTC1728ES5-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1728ES5-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-2.5#TRPBF?
LTC1728ES5-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-2.5#TRPBF 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 LTC1728ES5-2.5#TRPBF?
For technical support, including LTC1728ES5-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC1728ES5-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-2.5#TRPBF 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 LTC1728ES5-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-2.5#TRPBF?
All LTC1728ES5-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-2.5#TRPBF, 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 LTC1728ES5-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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