My Inquiry
My Account
Analog Devices Inc. LTC2911HDDB-5#TRPBF
- Part No.:
- LTC2911HDDB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,491
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2911HDDB-5#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator and latched reset functionality, designed for automotive-grade systems requiring ±1.5% threshold accuracy across –40°C to +125°C. It monitors V1 (3.3V), V2 (adjustable, 0.5V nominal threshold), and ADJ (adjustable, 0.5V nominal threshold), supports internal 200ms reset timeout, and operates down to 0.5V supply voltage - enabling reliable supervision in Li-ion battery-backed or low-voltage automotive ECUs.
For engineers reviewing the LTC2911HDDB-5#TRPBF datasheet, LTC2911HDDB-5#TRPBF pinout, LTC2911HDDB-5#TRPBF application, or LTC2911HDDB-5#TRPBF equivalent, key selection criteria include its H-grade temperature range, DFN-8 (3mm × 2mm) package, dual adjustable inputs (V2 & ADJ), PFI-based early power-fail warning, and TMR-latch capability for margin testing under controlled voltage stress.
Technical Context
The LTC2911HDDB-5#TRPBF implements three independent voltage comparators: one fixed 3.3V monitor on V1, and two high-impedance adjustable inputs (V2 and ADJ), each with 0.5V nominal threshold and ±1.5% accuracy over full temperature range. Its internal VCC is derived solely from V1 - unlike other variants - ensuring stable operation when V2 is used as a divider-configured monitor.
A dedicated power-fail comparator monitors PFI with 500mV falling / 515mV rising thresholds (3% hysteresis), driving open-drain PFO for early warning signaling. The TMR pin enables three modes: external capacitor timeout (9.4 ms/nF), internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) to hold RST state during system margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086 V (–6.5% of 3.3V), ±1.5% accuracy over –40°C to +125°C - guarantees no false reset within 5% supply tolerance band |
| V2 / ADJ Threshold | 500 mV nominal, ±7.5 mV (±1.5%) over temp - enables precise resistive-divider configuration for custom supply monitoring |
| PFI Threshold | 500 mV (falling), 515 mV (rising), 3% hysteresis - rejects noise while providing accurate early-warning trip point for primary supply |
| Reset Timeout | 200 ms (internal, TMR = V1) or 15–27 ms (external, CTMR = 2.2 nF) - configurable without external RC timing components when using internal mode |
| Supply Current | 35 µA typical at TA = 25°C, ≤40 µA over full temperature range - minimizes load on battery-backed or low-power rails |
| Min Operating Voltage | 0.5 V guaranteed RST/PFO low-state operation - ensures deterministic reset behavior during brownout or deep discharge |
| Package | 8-lead 3 mm × 2 mm plastic DFN with exposed pad (GND) - supports high-density automotive PCB layouts and thermal dissipation (θJA = 76°C/W) |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN with exposed pad (Pin 9, GND). Exposed pad may be left unconnected or soldered to PCB ground plane for improved thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 | Adjustable supply monitor input | High-impedance input with 0.5V threshold; used with resistive divider to monitor custom supply voltages (e.g., 1.0V, 1.5V, 2.8V) |
| V1 | 3.3V supply monitor & primary power source | Fixed –6.5% threshold (3.086V); supplies internal VCC and powers RST/PFO pull-down circuitry |
| PFO | Power-fail logic output | Open-drain output asserting low when PFI < 500 mV; provides early warning of imminent supply collapse |
| RST | Reset logic output | Open-drain output asserting low when any monitored input falls below threshold; latched via TMR pin |
| PFI | Power-fail monitor input | Input to dedicated comparator with 500/515 mV thresholds; configured via resistive divider to monitor main rail or battery stack |
| ADJ | Second adjustable monitor input | Identical to V2: 0.5V threshold, high-Z, supports third independent supply monitoring path |
| TMR | Reset timeout & latch control | Configures timeout mode (V1 = 200ms, GND = latch, capacitor = programmable delay); enables margin testing without hardware change |
| GND | Device ground reference | Primary ground return; exposed pad (Pin 9) is electrically connected to GND and enhances thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of 3.3V (V1), plus two user-configurable supplies (V2 & ADJ) - eliminates need for multiple discrete supervisors |
| Automotive-grade temperature range | –40°C to +125°C operation (H-grade) - qualified for engine control units, ADAS modules, and under-hood electronics |
| Power-fail early warning with hysteresis | PFI comparator with 15 mV hysteresis prevents chatter near threshold; enables graceful shutdown before critical brownout |
| Latch-enabled margin testing | TMR pin forces RST into persistent high/low state regardless of input conditions - simplifies voltage-margin validation in production test |
| Low-voltage guaranteed operation | RST and PFO outputs remain functional down to 0.5V V1 - ensures deterministic reset during battery depletion or cold-cranking scenarios |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervises 3.3V microcontroller core rail, 5V sensor interface rail (via divider on V2), and 12V battery backup (via divider on ADJ) in diesel ECU under wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-supply monitor with latched reset ensures MCU remains held in reset until all rails stabilize post-cold crank; PFO triggers NMI interrupt for battery voltage decay prediction. Use Value: Prevents erratic MCU boot during transient undervoltage events; ±1.5% threshold accuracy avoids false resets caused by 5% automotive supply tolerance. | Use Scenario: Monitors isolated 3.3V logic supply, 24V field bus input (via PFI divider), and 5V analog front-end supply (via ADJ divider) in modular PLC base unit. IC Role / Device Role / Timing Role: Provides coordinated reset assertion across domains; PFO signals field bus undervoltage >100ms before RST asserts, allowing firmware-initiated safe I/O shutdown. Use Value: Enables deterministic fail-safe behavior per IEC 61508; internal 200ms timeout eliminates external timing capacitor, reducing BOM count and layout area. |
| Li-ion Battery-Backed Telematics Gateway | Medical Infusion Pump Controller |
Use Scenario: Tracks main 5V DC/DC output (V1), backup 3.7V Li-ion stack (PFI), and 1.8V FPGA core rail (V2) in vehicle telematics module with GPS and cellular connectivity. IC Role / Device Role / Timing Role: Uses PFI to detect battery voltage decay below 3.3V (via 2:1 divider); asserts PFO to initiate data flush and graceful disconnect before V1 drops below 3.086V. Use Value: Guarantees nonvolatile memory write completion prior to power loss; 0.5V min operating voltage ensures RST remains asserted even during deep discharge. | Use Scenario: Supervises 3.3V MCU rail (V1), 5V motor driver supply (V2), and 2.5V ADC reference (ADJ) in Class II medical infusion pump with battery fallback and safety watchdog requirements. IC Role / Device Role / Timing Role: Latch mode (TMR = GND) enables manual reset hold during calibration; triple-monitoring satisfies dual-channel redundancy requirements per ISO 13485. Use Value: Eliminates need for external latch IC; ±1.5% threshold accuracy reduces design margin overhead, supporting tighter supply tolerances required for precision dosing control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Single adjustable input (V2), fixed 3.3V/5V options only; no second adjustable input (ADJ); PFI absent; 140ms fixed timeout | Lacks dual adjustable inputs and PFI warning - suitable only for basic dual-rail monitoring without early-failure detection | Select only if system requires only two monitored rails and no power-fail signaling; not drop-in compatible due to pinout and feature set mismatch |
| TPS3808G33DBVR | Single 3.3V monitor only; no V2/ADJ/PFI inputs; 200ms timeout; 3-pin SOT-23 package | Monitors only one supply; no multi-rail or early-warning capability - intended for simple microprocessor reset, not system-level supervision | Use only for cost-sensitive single-rail applications; cannot replace LTC2911HDDB-5#TRPBF's triple-monitoring or automotive temperature range |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911HDDB-5#TRPBF uniquely delivers triple independent monitoring (3.3V + two adjustable), integrated PFI-based early warning, latch-mode margin testing, and H-grade qualification - making it the sole option for automotive and safety-critical multi-rail systems requiring coordinated supervision and deterministic fail-safe behavior.
Availability
LTC2911HDDB-5#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, battery-backed telematics gateways, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC2911HDDB-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and automotive systems.
The LTC2911 family was designed specifically for high-reliability multi-rail supervision in automotive and industrial environments, emphasizing ±1.5% threshold accuracy, ultra-low quiescent current, and robust noise immunity across –40°C to +125°C.
FAQ
What is the function of the TMR pin on the LTC2911HDDB-5#TRPBF?
The TMR pin on the LTC2911HDDB-5#TRPBF controls reset timeout and latch behavior: tying it to V1 enables the internal 200ms timeout; grounding it latches the RST output state (high or low) for margin testing; connecting an external capacitor to GND sets a programmable timeout (9.4 ms/nF). This eliminates need for external timing components while enabling flexible test modes - a key advantage of the LTC2911HDDB-5#TRPBF in production validation.
How does the LTC2911HDDB-5#TRPBF differ from the LTC2911-1 through LTC2911-4 variants?
The LTC2911HDDB-5#TRPBF is the -5 variant, meaning V2 is an adjustable input (0.5V threshold), unlike -1 through -4 which fix V2 to 5V, 2.5V, 1.8V, or 1.2V. It also derives internal VCC exclusively from V1 - critical for stability when V2 is used as a divider-configured monitor. All variants share the same DFN-8 package and H-grade rating, but only LTC2911HDDB-5#TRPBF supports dual adjustable inputs (V2 + ADJ) for three fully customizable supply thresholds.
Can the LTC2911HDDB-5#TRPBF monitor a 1.0V supply and a 2.5V supply simultaneously?
Yes - the LTC2911HDDB-5#TRPBF can monitor both supplies simultaneously: configure the 1.0V rail using a resistive divider on the ADJ pin (0.5V threshold), and the 2.5V rail using a divider on the V2 pin (also 0.5V threshold). Each input has ±1.5% accuracy over –40°C to +125°C, and both operate independently. The V1 pin continues to monitor the mandatory 3.3V rail, enabling true triple-supply supervision with full configurability - a capability unique to the LTC2911HDDB-5#TRPBF among its family.
What is the purpose of the PFI pin on the LTC2911HDDB-5#TRPBF, and how is it used?
The PFI pin on the LTC2911HDDB-5#TRPBF connects to a resistive divider monitoring a primary system supply (e.g., 12V battery or 5V DC/DC output). When the divided voltage falls below 500 mV, PFO pulls low - providing early warning of impending power failure before V1/V2/ADJ trip. This allows firmware to initiate controlled shutdown (e.g., save state, sequence power-down). Its 15 mV hysteresis prevents noise-induced chatter, and the LTC2911HDDB-5#TRPBF's guaranteed 0.5V operation ensures PFO remains active even during severe brownout.
Does the LTC2911HDDB-5#TRPBF require external pull-up resistors on RST and PFO?
The LTC2911HDDB-5#TRPBF provides weak internal pull-ups to V1 (typically 29 µA at 3.3V), sufficient for most logic interfaces. However, external pull-ups are recommended when faster rise times are needed, when interfacing with higher-voltage logic (e.g., 5V MCU), or when driving capacitive loads >20 pF. For standard 3.3V systems with short traces, the internal pull-up is adequate - reducing BOM count and board space, a key benefit of the LTC2911HDDB-5#TRPBF in space-constrained automotive modules.
LTC2911HDDB-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.086V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-5#TRPBF FAQ
1.How can I place an order for LTC2911HDDB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-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 LTC2911HDDB-5#TRPBF reliable?
The price and inventory of LTC2911HDDB-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 LTC2911HDDB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-5#TRPBF?
LTC2911HDDB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-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 LTC2911HDDB-5#TRPBF?
For technical support, including LTC2911HDDB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-5#TRPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-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 LTC2911HDDB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-5#TRPBF?
All LTC2911HDDB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-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 LTC2911HDDB-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2911HDDB-5#TRPBF Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
