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Analog Devices Inc. LTC1728ES5-3.3#TRPBF
- Part No.:
- LTC1728ES5-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-3.3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,785
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Product details
Overview
LTC1728ES5-3.3#TRPBF from Analog Devices is a micropower precision triple supply monitor in 5-lead SOT-23 package, monitoring 3.3V, 1.8V, and adjustable (1.0V) supplies with ±1.5% threshold accuracy over temperature, 10µA typical supply current, and 200ms reset delay. It delivers active-low open-drain RST output for microprocessor reset in portable battery-powered equipment and notebook computers.
For engineers reviewing the LTC1728ES5-3.3#TRPBF datasheet, LTC1728ES5-3.3#TRPBF pinout, LTC1728ES5-3.3#TRPBF application, or LTC1728ES5-3.3#TRPBF equivalent, key selection criteria include guaranteed RST operation down to VCC3 ≥ 1V or VCC18 ≥ 1V, glitch immunity against transient undervoltage events, and compatibility with 3.3V/1.8V dual-rail systems requiring precise power sequencing.
Technical Context
The LTC1728ES5-3.3#TRPBF implements three independent comparators feeding a 200ms pulse generator that asserts RST low until all monitored supplies-VCC3 (3.3V), VCC18 (1.8V), and VCCA (adjustable 1.0V)-exceed their respective thresholds. Its internal bandgap reference enables accurate trip points across –40°C to 85°C.
Power is autonomously drawn from whichever supply (VCC3 or VCC18) reaches ≥1V first, ensuring early reset assertion during power-up. The RST output features weak internal 6µA pull-up to VCC3 but supports external pull-up to higher voltages (e.g., 5V logic), and VOL remains ≤0.4V at 2.5mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitor Inputs | VCC3 = 3.3V, VCC18 = 1.8V, VCCA = adjustable 1.0V threshold - enables dual-rail system monitoring without external resistors for fixed rails |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures reliable reset timing across industrial temperature range without calibration |
| Reset Delay | 200ms (min 140ms, max 280ms) - provides sufficient de-bounce for brownout recovery and prevents false resets |
| Supply Current | 10µA typical - allows integration into ultra-low-power battery-operated devices without impacting runtime |
| RST Output Type | Active-low open-drain with 6µA internal pull-up to VCC3 - supports level-shifting via external pull-up and interfaces directly with 3.3V/5V logic |
| Minimum Operating Voltage | VCC3 or VCC18 ≥ 1V guarantees correct RST state - ensures fail-safe reset assertion even during deep brownout conditions |
| Undervoltage Response Time | 110µs from input crossing threshold to RST assertion - enables fast detection of supply collapse before system instability |
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 asserted low when any monitored supply falls below threshold; requires external pull-up for logic high |
| GND (Pin 2) | Ground reference | Common return path for all internal comparators and bandgap reference; must be low-impedance connection |
| VCCA (Pin 3) | Adjustable supply sense input | High-impedance input for monitoring adjustable rail (e.g., DC/DC feedback node); threshold = 1.000V ±15mV |
| VCC3 (Pin 5) | 3.3V supply sense and power source | Senses 3.3V rail and powers internal circuitry when VCC3 > VCC18; bypass with ≥0.1µF ceramic capacitor |
| VCC18 (Pin 4) | 1.8V supply sense and power source | Senses 1.8V rail and powers internal circuitry when VCC18 > VCC3; bypass with ≥0.1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 1.8V, and adjustable 1.0V supplies concurrently - eliminates need for multiple discrete supervisors in compact dual-rail designs |
| Glitch-immune reset logic | Two-stage immunity: 50µs minimum duration for 10% threshold overdrive + 200ms debounce - rejects short transients without false triggering |
| Autonomous power sourcing | Draws power from highest-voltage valid supply (VCC3 or VCC18) - ensures RST assertion begins as soon as either rail reaches 1V |
| Low-voltage RST guarantee | RST state guaranteed correct for VCC3 ≥ 1V or VCC18 ≥ 1V - enables robust reset behavior during deep brownout where other supervisors fail |
| Adjustable third threshold | VCCA input accepts externally set threshold via resistor divider - supports custom rails (e.g., 1.2V, 2.5V) without redesigning supervisor circuit |
Applications
| Portable Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Power management in handheld medical devices with 3.3V MCU and 1.8V sensor interface. IC Role / Device Role / Timing Role: Triple supply monitor asserting RST until both 3.3V and 1.8V rails stabilize post-battery insertion. Use Value: Prevents MCU lockup during marginal battery voltage by enforcing 200ms reset hold time and guaranteeing RST validity down to 1V on either rail. | Use Scenario: Core logic power sequencing during cold boot in ultrabook platforms with 3.3V I/O and 1.8V memory rails. IC Role / Device Role / Timing Role: Generates system-wide reset signal only after 3.3V and 1.8V supplies exceed ±1.5% accurate thresholds and remain stable for 200ms. Use Value: Eliminates need for discrete RC timers and improves boot reliability versus ±2.5% threshold supervisors. |
| Intelligent Instruments | Desktop Computers |
Use Scenario: Precision data acquisition module with 3.3V ADC and 1.8V FPGA core, powered from shared DC/DC converter. IC Role / Device Role / Timing Role: Monitors dedicated 3.3V and 1.8V outputs plus adjustable VCCA tied to DC/DC feedback node for real-time rail tracking. Use Value: Enables dynamic adjustment of third threshold to match varying DC/DC output, avoiding recalibration when changing sensor front-end gain. | Use Scenario: Motherboard power-good signaling for CPU VRM and chipset rails in entry-level desktop systems. IC Role / Device Role / Timing Role: Supervises 3.3V standby and 1.8V core rails, asserting RST if either drops below threshold during thermal throttling or load transients. Use Value: Provides faster undervoltage response (110µs) than legacy 5V-only supervisors, preventing silent data corruption during VRM instability. |
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 3.3V/1.8V/ADJ monitoring; 1.2µA supply current | Eliminates need for external pull-up resistor; incompatible with wired-OR reset buses | Select when driving single-load 3.3V logic without bus sharing; avoid when interfacing with multi-source reset lines |
| LTC1326-2.5 | Monitors 2.5V/3.3V/ADJ (not 1.8V/3.3V); ±0.75% threshold accuracy; 8-lead MSOP package | Higher accuracy but mismatched voltage set; larger footprint limits space-constrained designs | Select only if system uses 2.5V instead of 1.8V rail; verify PCB layout supports MSOP vs SOT-23 |
Compared with LTC1728ES5-3.3#TRPBF, LTC1985-1.8 offers lower quiescent current and push-pull drive but lacks open-drain flexibility, while LTC1326-2.5 provides tighter accuracy at the cost of incompatible rail support and larger package - making LTC1728ES5-3.3#TRPBF optimal for 1.8V/3.3V dual-rail SOT-23 applications demanding proven ±1.5% stability.
Availability
LTC1728ES5-3.3#TRPBF is available at Aetrix Electronics and suitable for portable battery-powered equipment, notebook computers, intelligent instruments, and desktop computers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1728ES5-3.3#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 supply supervision in space-constrained, battery-sensitive applications with strict voltage tolerance requirements.
FAQ
What is the exact supply voltage monitoring configuration for LTC1728ES5-3.3#TRPBF?
The LTC1728ES5-3.3#TRPBF monitors three supplies: VCC3 (3.3V nominal, threshold 3.086V ±1.5%), VCC18 (1.8V nominal, threshold 1.683V ±1.5%), and VCCA (adjustable, threshold 1.000V ±15mV). This configuration is fixed per the -3.3 suffix and does not support reconfiguration to 5V or 2.5V rails.
Does LTC1728ES5-3.3#TRPBF provide individual comparator outputs like the LTC1727?
No, LTC1728ES5-3.3#TRPBF provides only the common active-low RST output. Unlike the LTC1727, it omits individual COMP3, COMP18, and COMPA pins - this simplifies routing in space-constrained layouts where only system-wide reset is required.
What is the minimum valid supply voltage to guarantee correct RST logic state for LTC1728ES5-3.3#TRPBF?
The LTC1728ES5-3.3#TRPBF guarantees correct RST logic state when either VCC3 ≥ 1V or VCC18 ≥ 1V. Below 1V on both rails, RST behavior is undefined; above 1V, RST remains asserted low until all thresholds are met and held for 200ms.
Can LTC1728ES5-3.3#TRPBF monitor a 2.5V rail instead of 1.8V?
No - the -3.3 suffix denotes fixed 3.3V/1.8V/ADJ monitoring. To supervise 2.5V, use LTC1728ES5-2.5#TRPBF, which replaces VCC18 with VCC25 (2.5V threshold 2.338V ±1.5%). Pinout and package are identical, but internal thresholds differ and are not field-programmable.
How does the 200ms reset delay in LTC1728ES5-3.3#TRPBF improve system reliability?
The 200ms reset delay ensures the LTC1728ES5-3.3#TRPBF holds RST low until all three supplies (3.3V, 1.8V, and adjustable) remain above their thresholds for a sustained period, preventing premature release during power-up ripple or transient brownouts - critical for initializing FPGAs, microcontrollers, and memory subsystems without corruption.
LTC1728ES5-3.3#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, 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
LTC1728ES5-3.3#TRPBF FAQ
1.How can I place an order for LTC1728ES5-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-3.3#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 LTC1728ES5-3.3#TRPBF reliable?
The price and inventory of LTC1728ES5-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1728ES5-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-3.3#TRPBF?
LTC1728ES5-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-3.3#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 LTC1728ES5-3.3#TRPBF?
For technical support, including LTC1728ES5-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1728ES5-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-3.3#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 LTC1728ES5-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-3.3#TRPBF?
All LTC1728ES5-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-3.3#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 LTC1728ES5-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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