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Analog Devices Inc. LTC1728ES5-5#TRPBF
- Part No.:
- LTC1728ES5-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,383
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Product details
Overview
LTC1728ES5-5#TRPBF from Analog Devices is a micropower precision triple supply monitor in 5-lead SOT-23 package, designed to simultaneously monitor 5V, 3.3V, and an adjustable input (VCCA) with ±1.5% threshold accuracy over temperature. It provides a single active-low open-drain RESET output with 200ms delay, guaranteed operation down to VCC3 or VCC5 ≥1V, and consumes only 10µA typical supply current. It is used in notebook computers and intelligent instruments for reliable power-on reset sequencing.
For engineers reviewing the LTC1728ES5-5#TRPBF datasheet, LTC1728ES5-5#TRPBF pinout, LTC1728ES5-5#TRPBF application, or LTC1728ES5-5#TRPBF equivalent, key selection criteria include its triple-supply monitoring capability with fixed 5V/3.3V thresholds, adjustable VCCA input, glitch-immune reset timing, low-voltage operating margin, and SOT-23 footprint compatibility for space-constrained embedded systems.
Technical Context
The LTC1728ES5-5#TRPBF implements three independent voltage comparators feeding a 200ms reset timer, with internal bandgap reference enabling accurate trip points across –40°C to 85°C. Its power-detect architecture selects VCC3 or VCC5 as supply source based on highest potential, ensuring RST assertion begins at ≥1V on either rail.
All three monitored inputs must exceed their respective thresholds-VRT5 = 4.675V (typ), VRT3 = 3.086V (typ), VRTA = 1.000V (typ)-before the reset timer starts; RST remains low until all are valid for 200ms. The part includes built-in glitch immunity via 10% hysteresis-equivalent input filtering and transient duration control per comparator overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitor Inputs | 5V (VCC5), 3.3V (VCC3), and adjustable (VCCA) - enables flexible system-level power supervision of core, I/O, and auxiliary rails |
| Reset Threshold Accuracy | ±1.5% over temperature - ensures consistent reset behavior without recalibration across industrial ambient range |
| Reset Pulse Width | 200ms typ - provides sufficient de-bounced hold time to prevent spurious processor resets during brownouts |
| Supply Current | 10µA typ - supports battery-powered and ultra-low-power applications without compromising supervision integrity |
| Minimum Operating Voltage | VCC3 or VCC5 ≥1V - guarantees correct RST state during deep brownout, critical for fail-safe shutdown sequences |
| Output Type | Active-low open-drain RST - allows level-shifting via external pull-up to 3.3V, 5V, or higher logic domains |
| Package | 5-Lead SOT-23 - compact footprint ideal for portable electronics and dense PCB layouts |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1.90mm × 1.50mm body, 0.95mm pitch, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low open-drain reset output | Drives system reset line low until all supplies meet thresholds for 200ms; requires external pull-up resistor |
| 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 auxiliary rails (e.g., DC/DC feedback node); threshold = 1.000V (typ) |
| VCC3 (Pin 5) | 3.3V sense input and primary power source | Supplies internal circuitry when ≥1V; also serves as reference for RST pull-up and comparator biasing |
| VCC5/VCC25/VCC18 (Pin 4) | 5V sense input and alternate power source | Enables dual-supply operation; powers device if > VCC3; trip point = 4.675V (typ) for LTC1728-5 variant |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 5V, 3.3V, and adjustable VCCA in one IC - eliminates need for discrete supervisor ICs or resistor-divider networks |
| Glitch-immune reset timing | Combines 10% input hysteresis-equivalent filtering and 200ms pulse generator - prevents false resets from noise or short transients |
| Low-voltage reset guarantee | RST state valid down to VCC3 or VCC5 = 1V - ensures deterministic behavior during severe brownout conditions |
| Auto-select power source | Dynamically chooses VCC3 or VCC5 as supply based on highest voltage - simplifies power domain design and improves robustness |
| Adjustable third input | VCCA accepts any rail between 0.985V–1.015V threshold - supports custom DC/DC outputs or auxiliary supplies without external resistors |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Monitoring main 5V, 3.3V, and standby 3.3V or 5V auxiliary rails during cold boot and sleep/wake transitions. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset signal to CPU and chipset after all rails stabilize. Use Value: Prevents partial initialization by enforcing 200ms delay post-stabilization, eliminating race conditions in multi-rail power delivery. | Use Scenario: Supervising core 3.3V, I/O 5V, and adjustable DC/DC output powering USB-C PD controller or PMIC. IC Role / Device Role / Timing Role: Single-chip reset generator with adjustable VCCA input tied to feedback node of buck converter. Use Value: Enables precise reset assertion at exact DC/DC output voltage (e.g., 1.0V ±15mV), improving system reliability under load transients. |
| Intelligent Instruments | Network Servers |
Use Scenario: Ensuring clean startup of FPGA, ADC, and analog front-end powered by isolated 5V, 3.3V, and 1.8V rails. IC Role / Device Role / Timing Role: Power-good sequencer asserting reset only after all three rails exceed ±1.5% thresholds for 200ms. Use Value: Eliminates need for external RC timing circuits while maintaining tight threshold tolerance required for metrology-grade accuracy. | Use Scenario: Monitoring redundant 5V and 3.3V supplies plus adjustable VCCA tied to hot-swap controller enable rail. IC Role / Device Role / Timing Role: Fail-safe reset initiator that holds RST low if any monitored rail drops below threshold during field operation. Use Value: Provides deterministic recovery window (200ms) before re-enabling server logic, preventing cascading failures during supply faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1326-5 | ±0.75% threshold accuracy, adjustable reset timeout, 8-lead MSOP package | Higher accuracy and programmable delay but larger footprint and higher cost | Select when tighter threshold tolerance or configurable reset timing is required over SOT-23 size constraint |
| LTC1985-1.8 | Push-pull RST output, monitors 3.3V/1.8V/ADJ, same SOT-23 package | Optimized for low-voltage systems with 1.8V rail instead of 5V; no 5V monitoring capability | Select for 1.8V-based platforms where push-pull drive eliminates external pull-up requirement |
Compared with LTC1326-5 and LTC1985-1.8, the LTC1728ES5-5#TRPBF offers the optimal balance of 5V/3.3V/ADJ monitoring, ±1.5% accuracy, ultra-low 10µA quiescent current, and minimal 5-pin SOT-23 footprint-making it ideal for cost- and space-sensitive applications requiring fixed 5V supervision.
Availability
LTC1728ES5-5#TRPBF is available at Aetrix Electronics and suitable for notebook computers, intelligent instruments, and portable battery-powered equipment requiring stable component supply and long-term production continuity.
Supply support for LTC1728ES5-5#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 supervision product line, engineered specifically for reliable, low-power, multi-rail reset generation in portable and embedded computing systems.
FAQ
What is the function of the VCCA pin on the LTC1728ES5-5#TRPBF?
The VCCA pin on the LTC1728ES5-5#TRPBF is a high-impedance adjustable supply sense input with a fixed 1.000V (typ) threshold. It monitors auxiliary rails such as DC/DC converter feedback nodes or low-voltage peripherals. If unused, it may be tied to VCC3 or VCC5; for the LTC1728ES5-5#TRPBF, VCCA is configured for 1V monitoring, not scaled via external resistors.
Does the LTC1728ES5-5#TRPBF support manual reset functionality?
No, the LTC1728ES5-5#TRPBF does not include a dedicated manual reset input. Its RST output is solely controlled by the monitored supply voltages. For manual reset capability, external circuitry (e.g., push-button switch to ground with RC filter) must be added, though this is not natively supported by the LTC1728ES5-5#TRPBF's pinout or internal logic.
What is the minimum supply voltage required for the LTC1728ES5-5#TRPBF to guarantee correct RST output state?
The LTC1728ES5-5#TRPBF guarantees correct RST logic state when either VCC3 or VCC5 is ≥1V. This ensures fail-safe reset assertion during deep brownout conditions. Operation below 1V on both pins invalidates RST behavior, as confirmed in the Absolute Maximum Ratings and Applications Information sections of the datasheet.
Can the LTC1728ES5-5#TRPBF monitor only two supplies instead of three?
Yes, the LTC1728ES5-5#TRPBF can monitor one or two supplies. Unused inputs (e.g., VCCA or VCC5) may be tied to VCC3 or another valid supply rail. The device asserts RST only when all *active* monitored supplies fall below their thresholds; tying an input disables its supervision role, effectively reducing monitored rails to two or one as needed.
How does the LTC1728ES5-5#TRPBF handle conflicting 5V and 3.3V supply rise times during power-up?
The LTC1728ES5-5#TRPBF uses an internal override function: if VCC5 is within ±25mV of VCC3 and <4.15V, it disables the 5V trip point and operates as a 3.3V-only monitor. Once VCC5 exceeds ~4.15V, the 5V threshold re-engages. This ensures RST releases correctly even with slow-rising 5V supplies passing through the 3.1V–4.15V region.
LTC1728ES5-5#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:
- 3.086V, 4.675V, 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
LTC1728ES5-5#TRPBF FAQ
1.How can I place an order for LTC1728ES5-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-5#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 LTC1728ES5-5#TRPBF reliable?
The price and inventory of LTC1728ES5-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1728ES5-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-5#TRPBF?
LTC1728ES5-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-5#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 LTC1728ES5-5#TRPBF?
For technical support, including LTC1728ES5-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-5#TRPBF requirements.
6.How does Aetrix verify that LTC1728ES5-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-5#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 LTC1728ES5-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-5#TRPBF?
All LTC1728ES5-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-5#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 LTC1728ES5-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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