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Analog Devices Inc. LTC1728ES5-2.5#TRMPBF
- Part No.:
- LTC1728ES5-2.5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-2.5#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:716
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Product details
Overview
LTC1728ES5-2.5#TRMPBF from Analog Devices is a micropower precision triple supply monitor in 5-lead SOT-23 package, designed to simultaneously monitor 3.3V, 2.5V, and an adjustable supply (VCCA) with ±1.5% threshold accuracy over temperature. It provides a single active-low open-drain RESET output asserted until all three supplies remain within specification for 200ms, supporting reliable power-up sequencing in portable and embedded systems.
For engineers reviewing the LTC1728ES5-2.5#TRMPBF datasheet, LTC1728ES5-2.5#TRMPBF pinout, LTC1728ES5-2.5#TRMPBF application, or LTC1728ES5-2.5#TRMPBF equivalent, key selection criteria include guaranteed RST operation down to VCC3 ≥ 1V or VCC25 ≥ 1V, 10µA typical supply current, glitch-immune undervoltage detection, and compatibility with 3.3V/2.5V/adjustable supply configurations in space-constrained designs.
Technical Context
The LTC1728ES5-2.5#TRMPBF implements three independent voltage comparators feeding a 200ms reset timer, with internal bandgap reference enabling accurate trip thresholds across –40°C to 85°C. Its power-detect architecture automatically selects VCC3 or VCC25 as the supply source depending on which voltage is higher, ensuring RST remains valid even during brownout transitions.
All comparator inputs (VCC3, VCC25, VCCA) feature tight ±1.5% threshold tolerance and built-in glitch immunity: input transients must exceed 10% of threshold magnitude for ≥50µs to trigger reset, while the 200ms pulse width debounces noise on the RST output line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC3 Threshold | 3.086V typical; ensures reliable reset assertion when 3.3V rail drops below 3.036V–3.135V range. |
| VCC25 Threshold | 2.338V typical; monitors 2.5V supply with 2.300V–2.375V trip window for ±1.5% accuracy. |
| VCCA Threshold | 1.000V typical; adjustable supply monitoring with 0.985V–1.015V accuracy enables custom voltage detection. |
| Reset Delay | 200ms nominal; guarantees stable system initialization after all supplies meet thresholds. |
| Supply Current | 10µA typical; ultra-low quiescent draw extends battery life in portable equipment. |
| RST Output | Active-low open-drain; supports pull-up to VCC3 or higher logic levels (e.g., 5V) for interface flexibility. |
| Operating Voltage | 1V minimum on VCC3 or VCC25; ensures reset integrity during deep brownout conditions. |
Pinout & Package
The LTC1728ES5-2.5#TRMPBF is housed in a 5-lead TSOT-23 package (S5), measuring 2.80mm × 1.60mm × 0.95mm, with lead pitch of 0.95mm and JEDEC MO-193 compliance. Thermal resistance θJA = 250°C/W enables operation up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Reset Logic Output | Active-low open-drain output; requires external pull-up; asserts low until all monitored supplies stabilize for 200ms. |
| GND (Pin 2) | Ground Reference | Common return path for all internal circuitry and comparator references. |
| VCCA (Pin 3) | Adjustable Supply Input | High-impedance sense input for user-defined voltage threshold (e.g., DC/DC feedback node); trip point = 1.000V ±1.5%. |
| VCC3 (Pin 5) | 3.3V Sense & Power Source | Primary supply pin; powers device when ≥ VCC25; bypass with ≥0.1µF ceramic capacitor. |
| VCC25 (Pin 4) | 2.5V Sense & Power Source | Secondary supply pin; powers device when > VCC3; bypass with ≥0.1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 2.5V, and adjustable supply independently with shared reset timing. |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +85°C range, eliminating need for external calibration. |
| 10µA typical supply current | Enables use in always-on battery-powered systems without significant runtime impact. |
| Glitch-immune reset logic | Rejects short-duration supply dips (<50µs) and integrates noise via slow comparator response. |
| 1V minimum operating voltage | Ensures RST remains valid during deep brownout on either VCC3 or VCC25 supply rails. |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Monitoring core logic (3.3V), I/O (2.5V), and CPU VRM feedback (adjustable) during cold boot and thermal throttling. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized 200ms reset pulse after all rails stabilize. Use Value: Prevents premature CPU execution by enforcing strict power-rail sequencing before release of processor reset. | Use Scenario: Validating battery-backed 3.3V, USB 2.5V, and adjustable DC/DC converter outputs during lid-open wake-up. IC Role / Device Role / Timing Role: Low-power supply monitor with 10µA quiescent current preserving battery charge during sleep states. Use Value: Enables reliable resume-from-suspend by asserting reset if any rail drops below threshold during wake-up sequence. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring stable 3.3V microcontroller supply, 2.5V ADC reference, and programmable sensor bias voltage before measurement initiation. IC Role / Device Role / Timing Role: Precision triple-monitor with ±1.5% threshold tolerance guaranteeing measurement accuracy across temperature. Use Value: Eliminates false-triggered resets caused by thermal drift in high-precision analog front-ends. | Use Scenario: Supervising 3.3V system rail, 2.5V wireless transceiver supply, and adjustable battery gauge input in handheld medical devices. IC Role / Device Role / Timing Role: Micropower supervisor with 1V minimum operating voltage maintaining reset integrity during battery depletion. Use Value: Extends usable battery life by enabling safe shutdown before critical voltage collapse. |
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 push-button reset capability. | Supports fail-safe system recovery via manual reset and timeout-based watchdog reset. | Select when system-level fault recovery beyond basic power monitoring is required. |
| LTC1726-2.5 | Adjustable reset and watchdog timeouts; same ±1.5% accuracy but higher 25µA supply current. | Enables configurable delay periods for diverse subsystems (e.g., FPGA vs MCU startup). | Select when programmable reset timing or integrated watchdog functionality is needed. |
Compared with LTC1326-2.5 and LTC1726-2.5, the LTC1728ES5-2.5#TRMPBF offers the lowest quiescent current (10µA vs 25–35µA) and smallest footprint (SOT-23 vs MSOP), making it optimal for size- and power-constrained applications where only fixed 200ms reset timing is required.
Availability
LTC1728ES5-2.5#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC1728ES5-2.5#TRMPBF 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 supervision product line, engineered specifically for reliable multi-rail monitoring in space-constrained, battery-sensitive, and thermally demanding embedded systems.
FAQ
What is the primary function of the LTC1728ES5-2.5#TRMPBF?
The LTC1728ES5-2.5#TRMPBF is a micropower triple supply monitor that supervises 3.3V, 2.5V, and an adjustable supply (VCCA), asserting an active-low RESET output until all three voltages remain within specification for 200ms. It ensures robust power-up sequencing and brownout protection in compact electronic systems.
How does the LTC1728ES5-2.5#TRMPBF determine its power source?
The LTC1728ES5-2.5#TRMPBF automatically selects its power source from either the VCC3 (3.3V) or VCC25 (2.5V) pin-whichever has the higher voltage-ensuring continuous operation and valid RST output even during supply transitions. This dual-source architecture guarantees RST functionality down to 1V on either supply rail.
Can the LTC1728ES5-2.5#TRMPBF monitor supplies other than 3.3V and 2.5V?
Yes-the LTC1728ES5-2.5#TRMPBF monitors VCC3 (3.3V), VCC25 (2.5V), and VCCA (adjustable). VCCA accepts any user-defined voltage via external resistor divider; its threshold is fixed at 1.000V ±1.5%, enabling precise supervision of DC/DC converters, battery gauges, or custom logic rails.
What is the significance of the 200ms reset delay in the LTC1728ES5-2.5#TRMPBF?
The 200ms reset delay in the LTC1728ES5-2.5#TRMPBF ensures that the RST output remains asserted until all monitored supplies have stabilized for this duration, preventing premature processor execution during power-up, brownout recovery, or transient events. This fixed timing eliminates external RC components and simplifies design.
Does the LTC1728ES5-2.5#TRMPBF support operation at temperatures beyond 85°C?
No-the LTC1728ES5-2.5#TRMPBF is rated for –40°C to +85°C (E-grade). For extended temperature operation up to +125°C, the LTC1728HS5-2.5 variant is specified, but the LTC1728ES5-2.5#TRMPBF itself is not characterized or guaranteed beyond +85°C ambient.
LTC1728ES5-2.5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC1728ES5-2.5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-2.5#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC1728ES5-2.5#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-2.5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-2.5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-2.5#TRMPBF?
LTC1728ES5-2.5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-2.5#TRMPBF 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#TRMPBF?
For technical support, including LTC1728ES5-2.5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-2.5#TRMPBF requirements.
6.How does Aetrix verify that LTC1728ES5-2.5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-2.5#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-2.5#TRMPBF?
All LTC1728ES5-2.5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-2.5#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-2.5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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