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Analog Devices Inc. LTC1728ES5-1.8#TRPBF
- Part No.:
- LTC1728ES5-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-1.8#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
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Product details
Overview
LTC1728ES5-1.8#TRPBF from Analog Devices is a micropower precision triple supply monitor in 5-lead SOT-23 package, monitoring 3V, 1.8V, and adjustable (1.0V) supply rails with ±1.5% threshold accuracy over temperature, 200ms reset delay, and guaranteed RST assertion down to 1V supply voltage. It serves as system power-on reset supervisor in portable battery-powered equipment requiring ultra-low 10µA typical supply current.
For engineers reviewing the LTC1728ES5-1.8#TRPBF datasheet, LTC1728ES5-1.8#TRPBF pinout, LTC1728ES5-1.8#TRPBF application, or LTC1728ES5-1.8#TRPBF equivalent, key selection considerations include its fixed 3V/1.8V dual-rail monitoring configuration, absence of individual comparator outputs (vs LTC1727), open-drain RST output with VCC3-referenced weak pull-up, and operation across –40°C to +85°C.
Technical Context
The LTC1728ES5-1.8#TRPBF implements three independent comparators feeding a 200ms debounce timer that drives a single active-low open-drain RST output. Its internal bandgap reference enables precise trip thresholds without external components, and power detection logic ensures correct RST state even when VCC3 or VCC18 drops to 1V.
Unlike the LTC1727, this variant omits individual COMP3/COMP18/COMPA outputs-only RST is provided. The device selects its operating supply dynamically from the highest potential among VCC3 (3V) and VCC18 (1.8V), enabling robust startup behavior during asymmetric rail sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitor Inputs | VCC3 = 3V, VCC18 = 1.8V, VCCA = adjustable 1.0V threshold - enables simultaneous monitoring of core logic, I/O, and analog rails |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures reliable reset assertion without false triggers across industrial temperature range |
| Reset Delay | 200ms typ after all supplies exceed thresholds - meets microprocessor minimum reset hold time requirements |
| Supply Current | 10µA typ - supports multi-year battery life in portable instrumentation and handheld devices |
| RST Output Type | Active-low open-drain with weak 6µA internal pull-up to VCC3 - allows level-shifting via external pull-up to 5V or 3.3V logic |
| Minimum Operating Voltage | VCC3 or VCC18 ≥ 1V guarantees correct RST state - ensures reset remains asserted during brownout down to 1V |
| Glitch Immunity | 110µs undervoltage detect response + 200ms pulse width - rejects short transients and prevents spurious resets |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1.90mm × 1.50mm footprint, 0.95mm height, lead-free finish, tape-and-reel packaging (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Open-drain logic output; must be pulled up externally; asserts low until all monitored supplies exceed thresholds for 200ms |
| GND (Pin 2) | Ground reference | Common return path for all internal comparators and bandgap reference; requires low-impedance connection |
| VCCA (Pin 3) | Adjustable threshold input | High-impedance sense input for third rail; threshold = 1.000V ±15mV; unused pin may tie to VCC3 or VCC18 |
| VCC3 (Pin 5) | 3V supply rail input & power source | Sense input for 3V rail (threshold = 3.086V ±50mV); powers device when ≥ VCC18; bypass with ≥0.1µF ceramic capacitor |
| VCC18 (Pin 4) | 1.8V supply rail input & power source | Sense input for 1.8V rail (threshold = 1.683V ±27mV); powers device when ≥ VCC3; bypass with ≥0.1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Triple-rail monitoring | Simultaneously supervises 3V, 1.8V, and adjustable 1.0V supplies - eliminates need for multiple discrete supervisors in mixed-voltage SoC systems |
| No external components required | Factory-trimmed thresholds and internal bandgap reference - reduces BOM count and PCB area vs resistor-divider-based solutions |
| Dynamic supply selection | Auto-selects VCC3 or VCC18 as power source - ensures RST remains valid during asymmetric power-up sequences common in FPGA and ASIC platforms |
| Guaranteed 1V operation | RST state defined down to 1V on either VCC3 or VCC18 - provides fail-safe reset assertion during deep brownout conditions |
| Low-power design | 10µA typical quiescent current - enables use in always-on subsystems such as real-time clocks and battery-backed memory controllers |
Applications
| Portable Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Power management in handheld medical monitors with 3V MCU, 1.8V sensor interface, and 1.0V ADC reference rail. IC Role / Device Role / Timing Role: Triple-supply reset supervisor ensuring synchronized boot of processor, peripherals, and analog front-end. Use Value: Prevents firmware corruption by holding reset until all rails stabilize, leveraging 200ms delay and ±1.5% threshold accuracy. | Use Scenario: Core logic power sequencing in ultrabook platforms with 3V chipset, 1.8V DDR interface, and 1.0V GPU voltage regulator. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete reset ICs for multi-rail CPU subsystems. Use Value: Reduces component count and layout complexity while maintaining guaranteed reset assertion down to 1V during battery sag. |
| Intelligent Instruments | Desktop Computers |
Use Scenario: Calibration-critical test equipment requiring stable 3V microcontroller, 1.8V DAC, and 1.0V precision reference. IC Role / Device Role / Timing Role: Precision supply monitor enforcing strict voltage compliance before enabling measurement circuitry. Use Value: ±1.5% threshold accuracy ensures repeatable calibration cycles without manual intervention or software compensation. | Use Scenario: Motherboard power-good signaling for PCIe add-in cards with 3V control logic, 1.8V SerDes, and 1.0V PLL supply. IC Role / Device Role / Timing Role: System-level reset generator coordinating power-up of host and peripheral domains. Use Value: Open-drain RST output allows direct interfacing with 3.3V or 5V reset buses without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1985-1.8 | Push-pull RST output (not open-drain); same 3V/1.8V/ADJ monitoring; 1.2µA lower quiescent current | Requires no external pull-up resistor; incompatible with wired-OR reset buses | Select when driving CMOS inputs directly and minimizing external components |
| LTC1326-2.5 | Monitors 2.5V/3.3V/ADJ instead of 3V/1.8V/ADJ; ±0.75% threshold accuracy; includes watchdog timer | Not suitable for 1.8V rail monitoring; adds watchdog functionality for firmware crash recovery | Select when system requires both supply supervision and watchdog timeout capability |
Compared with LTC1985-1.8 and LTC1326-2.5, the LTC1728ES5-1.8#TRPBF offers optimal balance of open-drain flexibility, proven 200ms timing, and industrial temperature range - making it preferred for legacy-compatible designs where RST bus sharing or exact 1.8V threshold matching is critical.
Availability
LTC1728ES5-1.8#TRPBF is available at Aetrix Electronics and suitable for portable battery-powered equipment, notebook computers, intelligent instruments, desktop computers, and network servers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1728ES5-1.8#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, designed specifically for reliable, low-power, multi-rail reset generation in space-constrained embedded systems.
FAQ
What supply voltages does the LTC1728ES5-1.8#TRPBF monitor?
The LTC1728ES5-1.8#TRPBF monitors three supply rails: VCC3 at 3.0V nominal (trip threshold 3.086V ±50mV), VCC18 at 1.8V nominal (trip threshold 1.683V ±27mV), and VCCA at adjustable 1.0V (trip threshold 1.000V ±15mV). These fixed thresholds are factory-trimmed and require no external resistors.
Does the LTC1728ES5-1.8#TRPBF provide individual supply status outputs?
No, the LTC1728ES5-1.8#TRPBF provides only a single active-low open-drain RST output. Unlike the LTC1727, it does not include individual comparator outputs (e.g., COMP3, COMP18, COMPA). All monitoring logic feeds into the unified 200ms reset timer.
What is the minimum supply voltage required for the LTC1728ES5-1.8#TRPBF to guarantee correct RST behavior?
The LTC1728ES5-1.8#TRPBF guarantees correct RST logic state when either VCC3 or VCC18 is ≥1V. This ensures the reset output remains asserted during brownout conditions down to 1V, a key reliability feature for battery-operated systems.
Can the LTC1728ES5-1.8#TRPBF operate from a single 3.3V supply?
No - the LTC1728ES5-1.8#TRPBF is configured specifically for 3V and 1.8V rails. Its VCC3 pin expects ~3V (not 3.3V), and VCC18 expects ~1.8V. For 3.3V/1.8V monitoring, use LTC1728ES5-3.3#TRPBF instead, which has VCC3 = 3.3V and VCC18 = 1.8V thresholds.
How is power supplied to the LTC1728ES5-1.8#TRPBF during startup?
The LTC1728ES5-1.8#TRPBF auto-selects its power source from the highest potential between VCC3 and VCC18. If VCC18 reaches 1.8V before VCC3 reaches 3V, the device powers up from VCC18 - ensuring RST asserts correctly even with reverse rail sequencing.
LTC1728ES5-1.8#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:
- 1.683V, 2.805V, 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
LTC1728ES5-1.8#TRPBF FAQ
1.How can I place an order for LTC1728ES5-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-1.8#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 LTC1728ES5-1.8#TRPBF reliable?
The price and inventory of LTC1728ES5-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1728ES5-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-1.8#TRPBF?
LTC1728ES5-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-1.8#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 LTC1728ES5-1.8#TRPBF?
For technical support, including LTC1728ES5-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-1.8#TRPBF requirements.
6.How does Aetrix verify that LTC1728ES5-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-1.8#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 LTC1728ES5-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-1.8#TRPBF?
All LTC1728ES5-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-1.8#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 LTC1728ES5-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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