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Analog Devices Inc. LTC2909ITS8-5#TRPBF
- Part No.:
- LTC2909ITS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2909ITS8-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,218
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Product details
Overview
LTC2909ITS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple-input supply monitor IC for system-level power integrity supervision. It features two adjustable 0.5V-threshold inputs with pin-selectable polarity, a fixed 4.425V VCC UVLO threshold (±1.5% accuracy), 200ms internal reset timeout, and open-drain RST output - deployed in desktop computers, network servers, and automotive ECUs to prevent brownout-induced firmware corruption.
For engineers reviewing the LTC2909ITS8-5#TRPBF datasheet, LTC2909ITS8-5#TRPBF pinout, LTC2909ITS8-5#TRPBF application, or LTC2909ITS8-5#TRPBF equivalent, key selection criteria include guaranteed 0.5V ADJ input threshold accuracy over –40°C to +85°C, ultralow 50μA quiescent current, 6.5V internal shunt regulator capability, buffered 1.000V reference output, and TSOT-23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2909ITS8-5#TRPBF implements dual adjustable comparators with polarity decoding via the three-state SEL pin (VIL = 0.4V, VIH = 1.4V), enabling simultaneous monitoring of positive UV/OV and negative UV/OV conditions without external components. Its third comparator monitors VCC against a fixed 4.425V UVLO threshold with ±1.5% accuracy across temperature.
Reset assertion uses glitch-filtered comparator outputs feeding a programmable timeout block - selectable as internal 200ms (TMR = GND), external capacitor-based (9ms/nF), or disabled (TMR = VCC). The RST output is open-drain, specified to sink 2.5mA at VCC = 3V with VOL ≤ 0.30V, and operates down to VCC = 0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 4.425V nominal, ±1.5% accuracy over –40°C to +85°C - ensures reliable power-on reset for 5V logic systems before supervisor initialization. |
| ADJ Input Threshold | 0.500V nominal, ±1.5% accuracy - enables precise trip-point setting for custom supply rails using external resistor dividers. |
| Quiescent Current | 50μA typical at 2.175V < VCC < 6V - supports battery-backed or always-on monitoring without significant power penalty. |
| Reference Output | 1.000V buffered, ±15mV accuracy, ±1mA drive - provides stable offset for negative-supply monitoring circuits. |
| Reset Timeout | 200ms internal (TMR = GND), 16–25ms with 2.2nF capacitor, or disabled - configurable delay prevents spurious resets during transient supply recovery. |
| VCC Shunt Regulation | 6.5V nominal, 6.0–6.9V range - allows direct connection to supplies up to 6V or operation from higher voltages with series current-limiting resistor. |
| RST Output VOL | ≤0.30V at VCC = 3V, IRST = 2500μA - guarantees clean logic-low assertion even under heavy pull-up loading. |
Pinout & Package
Package: 8-lead TSOT-23 (3mm × 1.75mm), RoHS-compliant, exposed pad optional for thermal relief. Pin 1 is SEL (top-left corner when marking dot is oriented top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Three-state polarity select input | Determines ADJ1/ADJ2 input polarity: VCC = both positive, GND = both negative, open = mixed polarity - no external components required. |
| ADJ1 (Pin 2) | Adjustable voltage monitor input 1 | 0.5V threshold comparator input; polarity set by SEL - used for primary supply (e.g., 5V core) UV/OV detection. |
| REF (Pin 3) | Buffered 1.000V reference output | Stable offset source for negative-supply resistor dividers; drives up to 1mA load with minimal line/load regulation error. |
| GND (Pin 4) | Signal and power ground reference | Common return path for all analog comparators and digital logic; must be low-impedance connection to PCB ground plane. |
| RST (Pin 5) | Open-drain reset output | Inverted active-low output asserted during any fault (UV/OV on ADJ1/ADJ2 or VCC UVLO); requires external pull-up resistor. |
| VCC (Pin 6) | Supply input / shunt-regulated rail | Operates from 0.5V to 6V directly; above 6V functions as 6.5V shunt regulator - series resistor required to limit IVCC ≤ 10mA. |
| TMR (Pin 7) | Reset timeout control | GND = 200ms internal timeout; capacitor to GND = 9ms/nF programmable timeout; VCC = comparator mode (no timeout). |
| ADJ2 (Pin 8) | Adjustable voltage monitor input 2 | Second 0.5V threshold comparator input; polarity synchronized with ADJ1 per SEL state - used for secondary supply (e.g., 3.3V I/O) monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable input polarity | SEL pin configures ADJ1/ADJ2 as positive UV/OV, negative UV/OV, or mixed - eliminates need for external level-shifting circuitry in multi-rail systems. |
| Guaranteed sub-1V operation | RST remains functional down to VCC = 0.5V with VOL ≤ 0.15V at 100μA - ensures robust reset assertion during deep brownout conditions. |
| Input glitch rejection | Integrated low-pass filtering on ADJ inputs rejects transients < 500μs duration - prevents false resets from switching noise or load transients. |
| 6.5V internal shunt regulator | Enables direct interface to 12V automotive or industrial supplies using only one series resistor - avoids external LDO or Zener. |
| Buffered 1V reference | 1.000V ±15mV output with ±1mA sourcing/sinking capability - simplifies negative-supply monitoring by eliminating external reference ICs. |
Applications
| Desktop Computer Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Real-time supervision of +5V core, +3.3V I/O, and –12V analog rails during cold cranking and load dump events. IC Role / Device Role / Timing Role: Triple-input monitor asserting RST during undervoltage on any rail, with 200ms timeout ensuring processor reset completion before release. Use Value: Prevents firmware corruption by guaranteeing full CPU reset before power stabilization, leveraging ±1.5% threshold accuracy across –40°C to +85°C. | Use Scenario: Monitoring 12V battery feed and isolated 5V microcontroller supply in door module ECUs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Dual ADJ inputs configured for positive UV (12V) and negative OV (–5V sensor bias) detection; VCC UVLO validates MCU supply integrity. Use Value: Enables single-chip detection of battery sag (<10.5V) and sensor rail overvoltage (>5.5V) without external comparators or references. |
| Network Server Core Voltage Supervision | Industrial PLC I/O Power Integrity |
Use Scenario: Ensuring stable operation of 5V, 3.3V, and 1.8V FPGA core supplies in high-density server blades with tight thermal constraints. IC Role / Device Role / Timing Role: ADJ1/ADJ2 monitor 5V/3.3V rails using resistor dividers; REF provides offset for 1.8V rail monitoring via external op-amp interface. Use Value: Reduces BOM count by replacing three discrete supervisors with one TSOT-23-8 device, saving >25mm² PCB area. | Use Scenario: Detecting undervoltage on 24V fieldbus supply and overvoltage on isolated 5V logic rail in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: SEL = GND configures both ADJ inputs for negative polarity, enabling 24V UV detection (via resistive divider to REF) and 5V OV detection (via divider to GND). Use Value: Achieves ±1.5% trip accuracy on 24V rail despite 100°C ambient, avoiding false trips caused by conventional 5% tolerance supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2909CTS8-5#TRPBF | Same functionality and pinout, but rated for 0°C to 70°C operating range instead of –40°C to +85°C. | Suitable for commercial-grade desktop/server applications; not qualified for automotive or extended-temperature industrial use. | Select when ambient temperature stays within 0°C–70°C and cost sensitivity outweighs extended temp qualification. |
| TPS3808G33DBVR | Single 3.3V UVLO supervisor with 200ms timeout; lacks dual adjustable inputs, polarity selection, and REF output. | Only monitors VCC rail; cannot replace LTC2909ITS8-5#TRPBF in multi-rail or negative-supply applications. | Use only for simple 3.3V-only systems where dual-rail or negative monitoring is unnecessary. |
Compared with LTC2909CTS8-5#TRPBF, the LTC2909ITS8-5#TRPBF offers guaranteed operation down to –40°C for automotive and industrial environments, while TPS3808G33DBVR reduces functionality to single-rail monitoring - making LTC2909ITS8-5#TRPBF irreplaceable for precision multi-supply supervision requiring polarity flexibility and reference support.
Availability
LTC2909ITS8-5#TRPBF is available at Aetrix Electronics and suitable for desktop computer power sequencing, automotive body control modules, and network server core voltage supervision requiring stable component supply across extended temperature ranges.
Supply support for LTC2909ITS8-5#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand its precision power management portfolio.
The LTC2909 product line delivers ultra-accurate, micropower supply monitoring ICs designed for mission-critical power integrity in computing, communications, and automotive systems where ±1.5% threshold accuracy and sub-1V operation are mandatory.
FAQ
What is the guaranteed operating temperature range for LTC2909ITS8-5#TRPBF?
The LTC2909ITS8-5#TRPBF is specified for –40°C to +85°C operation (I-grade), validated across this full range for all key parameters including ADJ input threshold accuracy (±1.5%), VCC UVLO (4.425V ±1.5%), and quiescent current (50μA typical). This makes LTC2909ITS8-5#TRPBF suitable for automotive under-hood and industrial control applications where ambient extremes are common.
How does the SEL pin configure input polarity on LTC2909ITS8-5#TRPBF?
The SEL pin on LTC2909ITS8-5#TRPBF is a three-state input that sets ADJ1/ADJ2 polarity: tied to VCC enables both inputs for positive UV/OV monitoring; tied to GND configures both for negative UV/OV; left open supports mixed polarity (e.g., ADJ1 positive UV, ADJ2 negative OV). No external components are needed, and leakage is limited to ±10μA in open state - confirmed in Electrical Characteristics Table.
Can LTC2909ITS8-5#TRPBF monitor a single supply for both UV and OV conditions?
Yes, LTC2909ITS8-5#TRPBF can monitor one supply for both UV and OV using three external resistors (RP4/RP5/RP6 or RN4/RN5/RN6) connected to ADJ1 and ADJ2, as shown in Figures 3 and 4 of the datasheet. For a 5V supply at ±5% tolerance, recommended values are RP4 = 76.8kΩ, RP5 = 10.7kΩ, RP6 = 453kΩ - enabling single-rail window monitoring without additional ICs.
What is the minimum VCC voltage required for LTC2909ITS8-5#TRPBF to assert a valid RST low?
LTC2909ITS8-5#TRPBF guarantees RST output low voltage (VOL) ≤ 0.15V at VCC = 0.5V and IRST = 100μA, per Absolute Maximum Ratings and Electrical Characteristics tables. This ultralow-voltage operation ensures reliable reset assertion during severe brownout events where other supervisors fail - a key differentiator confirmed in the "Ultralow Voltage Reset" feature list.
Does LTC2909ITS8-5#TRPBF require an external bypass capacitor on the VCC pin?
Yes, LTC2909ITS8-5#TRPBF requires a ≥0.1μF ceramic capacitor between VCC and GND, as explicitly stated in the Pin Functions section: "Bypass this pin to ground with a 0.1μF (or greater) capacitor." This stabilizes the internal shunt regulator and comparator references, preventing oscillation or false resets - omission violates recommended layout per Linear Technology Application Note 2909fb.
LTC2909ITS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4.425V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2909ITS8-5#TRPBF FAQ
1.How can I place an order for LTC2909ITS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2909ITS8-5#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 LTC2909ITS8-5#TRPBF reliable?
The price and inventory of LTC2909ITS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2909ITS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2909ITS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2909ITS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2909ITS8-5#TRPBF?
LTC2909ITS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2909ITS8-5#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 LTC2909ITS8-5#TRPBF?
For technical support, including LTC2909ITS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2909ITS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC2909ITS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2909ITS8-5#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 LTC2909ITS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2909ITS8-5#TRPBF?
All LTC2909ITS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2909ITS8-5#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 LTC2909ITS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2909ITS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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