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Analog Devices Inc. LTC2901-4IGN#TRPBF
- Part No.:
- LTC2901-4IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2901-4IGN#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
LTC2901-4IGN#TRPBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, 10% undervoltage tolerance selection via TOL pin, ±1.5% threshold accuracy over temperature, 43μA typical supply current, and adjustable reset/watchdog timing via external capacitors. It monitors four independent supplies (e.g., 5V, 3.3V, 2.5V, 1.8V) in multivoltage systems such as telecom equipment and network servers.
For engineers reviewing the LTC2901-4IGN#TRPBF datasheet, LTC2901-4IGN#TRPBF pinout, LTC2901-4IGN#TRPBF application, or LTC2901-4IGN#TRPBF equivalent, key selection criteria include its push-pull RST output (vs open-drain variants), TOL pin logic-level programmability for 5%/10% thresholds, guaranteed RST operation down to VCC = 1V, and 16-pin narrow SSOP package compatibility with high-density PCB layouts.
Technical Context
The LTC2901-4IGN#TRPBF implements four independent voltage comparators with user-selectable thresholds across 16 combinations (5V/3.3V/3V/2.5V/1.8V/1.5V/±Adj), where VPG pin programming sets the input configuration via a precision resistive divider. Its internal bandgap reference (1.210V ±1.5%) enables accurate threshold generation across –40°C to 85°C.
Reset and watchdog timing are capacitor-programmable: CRT sets tRST (4.6ms/nF), CWT sets tWD (20ms/nF); both support minimum delays of 50μs and 200μs respectively when left unconnected. The TOL pin (Pin 7) selects 5% or 10% undervoltage tolerance-logic low for 5%, high for 10%-exclusively on LTC2901-3/LTC2901-4 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 43μA typical - enables battery-backed or ultra-low-power system monitoring without significant quiescent load. |
| Threshold Accuracy | ±1.5% over temperature - ensures reliable reset assertion across industrial temperature range without calibration. |
| RST Output Type | Push-pull - actively drives high to V2, eliminating need for external pull-up resistor in most applications. |
| VCC Operating Range | 1V minimum - guarantees correct RST/COMPX logic state during brownout, supporting graceful power-down sequencing. |
| Input Voltage Range | –0.3V to 7V per input - accommodates monitoring of positive, negative, and adjustable supplies with robust ESD protection. |
| Reset Delay Range | 50μs to >10s via CRT capacitor - supports microprocessor reset timing requirements from fast boot to complex initialization sequences. |
| Watchdog Timeout Range | 200μs to >10s via CWT capacitor - configurable to match software execution cycles without requiring firmware modification. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), 0.15mm max height, 0.65mm pitch, RoHS-compliant lead-free (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP3 (Pin 1) | Comparator Output 3 | Active-high nondelayed monitor signal for V3 input; weak pull-up to V2 enables direct connection to logic inputs. |
| COMP1 (Pin 2) | Comparator Output 1 | Active-high nondelayed monitor signal for V1 input; provides individual fault indication without reset delay. |
| V3 (Pin 3) | Voltage Input 3 | Configurable input for 2.5V, 1.8V, 1.5V, or ADJ mode; high-impedance (>100MΩ) minimizes loading on monitored rail. |
| V1 (Pin 4) | Voltage Input 1 | Primary supply input (5V or 3.3V); greater of V1/V2 defines internal VCC, enabling self-powered operation. |
| CRT (Pin 5) | Reset Timing Capacitor | Connects external capacitor to GND to set precise reset timeout (4.6ms/nF); open-circuit yields ~50μs minimum. |
| RST (Pin 6) | Reset Logic Output | Push-pull active-low output driven to V2; asserts when any input falls below threshold and holds for programmed CRT delay. |
| TOL (Pin 7) | Tolerance Selection Input | Logic-level control (0.3VCC/0.7VCC thresholds) to select 5% or 10% undervoltage detection window - unique to LTC2901-3/4. |
| WDI (Pin 8) | Watchdog Input | Rising/falling edge resets watchdog timer; required within tWD period to prevent RST pulse (LTC2901-4) or WDO assertion (LTC2901-2). |
| CWT (Pin 9) | Watchdog Timing Capacitor | Connects external capacitor to GND to set watchdog timeout (20ms/nF); open-circuit yields ~200μs minimum. |
| GND (Pin 10) | Ground Reference | Common return for all analog and digital circuitry; requires low-inductance connection to minimize noise coupling. |
| VPG (Pin 11) | Program Input | Accepts voltage divider ratio from VREF/GND to select one of 16 preset/adjustable voltage monitoring configurations. |
| VREF (Pin 12) | Buffered Reference | 1.210V ±1.5% bandgap reference; sources/sinks ±1mA, drives up to 1000pF bypass capacitor without oscillation. |
| V4 (Pin 13) | Voltage Input 4 | Configurable input for 1.8V, 1.5V, ADJ, or –ADJ mode; supports negative supply monitoring via VREF-referenced divider. |
| V2 (Pin 14) | Voltage Input 2 | Secondary supply input (3.3V/3V/2.5V); greater of V1/V2 defines VCC and serves as pull-up rail for all logic outputs. |
| COMP4 (Pin 15) | Comparator Output 4 | Active-high nondelayed monitor signal for V4 input; enables independent validation of fourth supply before system enable. |
| COMP2 (Pin 16) | Comparator Output 2 | Active-high nondelayed monitor signal for V2 input; provides real-time status of secondary supply independent of reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| 16 Preset/Adjustable Threshold Combinations | Single VPG pin programming eliminates multiple external components; supports mixed-rail systems (5V/3.3V/2.5V/1.8V) without redesign. |
| Push-Pull RST Output | Eliminates external pull-up resistor, reduces BOM count, improves rise time (<206ns with 150pF load), and ensures defined logic level during V2 transitions. |
| TOL Pin for 5%/10% Undervoltage Selection | Hardware-selectable tolerance avoids firmware dependency; enables single design to support multiple compliance standards (e.g., telecom vs industrial). |
| Guaranteed Operation Down to VCC = 1V | Ensures valid reset assertion during brownout conditions, preventing processor lockup in systems with asymmetric power sequencing. |
| Individual Nondelayed Monitor Outputs (COMP1–COMP4) | Enables real-time supply health diagnostics without reset delay; supports predictive maintenance and fault isolation in redundant power architectures. |
| Power Supply Glitch Immunity | Internal filtering prevents false resets from transient noise on monitored rails, reducing system instability in electrically noisy environments like motor drives. |
Applications
| Desktop and Notebook Computers | Multivoltage Systems |
|---|---|
Use Scenario: Monitoring core, I/O, memory, and auxiliary rails during power-up, thermal throttling, and sleep/wake transitions. IC Role / Device Role / Timing Role: Quad supply monitor with independent COMP outputs and programmable RST delay ensures synchronized processor initialization and memory controller readiness. Use Value: Prevents boot failures caused by out-of-spec 1.8V DDR3 or 3.3V PCIe rails using ±1.5% threshold accuracy and glitch immunity. | Use Scenario: Supervising heterogeneous power domains in FPGA-based systems with 5V, 3.3V, 2.5V, and 1.2V supplies. IC Role / Device Role / Timing Role: Configurable voltage thresholds (via VPG) and TOL pin enable single part to validate multiple rail combinations across product variants. Use Value: Reduces design reuse effort by 100% compared to discrete comparator solutions; 43μA quiescent current extends battery life in portable configurations. |
| Telecom Equipment | Network Servers |
Use Scenario: Ensuring stable operation of line cards with +48V DC-DC converters, 3.3V management controllers, and –48V analog interfaces. IC Role / Device Role / Timing Role: –ADJ mode on V4 monitors negative supplies using VREF-referenced divider; TOL pin supports 5% tolerance for telecom-grade reliability. Use Value: Eliminates need for separate negative-supply supervisors; ±1.5% accuracy meets GR-63-CORE seismic survivability requirements. | Use Scenario: Validating redundant 12V, 5V, 3.3V, and 1.8V rails in blade server backplanes with hot-swap capability. IC Role / Device Role / Timing Role: Individual COMP outputs feed baseboard management controller (BMC) for real-time rail health telemetry; RST coordinates CPU and memory reset. Use Value: Enables predictive failure analysis via BMC logging of individual rail faults before full system reset occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2901-3IGN#TRPBF | Open-drain RST output; identical pinout, thresholds, and timing; differs only in RST driver architecture. | Requires external pull-up resistor; suitable where level-shifting to higher voltage rails is needed. | Select when interfacing with 5V logic families or when RST must be pulled to a voltage exceeding V2. |
| TPS3307-33DGNR | Fixed 3.3V/2.5V/1.8V triple monitor; no adjustable thresholds, no watchdog, no TOL pin; 8-pin MSOP package. | Limited to three fixed rails; lacks programmability and individual COMP outputs. | Choose for cost-sensitive, single-rail-focused designs where quad monitoring and flexibility are unnecessary. |
Compared with LTC2901-3IGN#TRPBF, the LTC2901-4IGN#TRPBF's push-pull RST reduces component count and improves timing predictability; versus TPS3307-33DGNR, it offers full quad programmability, watchdog functionality, and industrial temperature range at the cost of larger footprint and higher complexity.
Availability
LTC2901-4IGN#TRPBF is available at Aetrix Electronics and suitable for desktop computers, telecom equipment, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC2901-4IGN#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, serving industrial, automotive, communications, and healthcare markets.
The LTC2901 family was designed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, low-power multirail supervision in space-constrained systems where reliability under brownout and thermal stress is critical.
FAQ
What is the function of the TOL pin on the LTC2901-4IGN#TRPBF?
The TOL pin (Pin 7) on the LTC2901-4IGN#TRPBF selects undervoltage detection tolerance: a logic low configures 5% thresholds, while a logic high selects 10% thresholds. This hardware-selectable feature enables a single LTC2901-4IGN#TRPBF design to meet varying system reliability requirements without firmware changes or component swaps.
How does the LTC2901-4IGN#TRPBF differ from the LTC2901-2IGN#TRPBF?
The LTC2901-4IGN#TRPBF and LTC2901-2IGN#TRPBF share identical push-pull RST output and 16-threshold programming, but differ in TOL pin functionality: LTC2901-4IGN#TRPBF includes the TOL pin for 5%/10% tolerance selection, whereas LTC2901-2IGN#TRPBF lacks this pin and operates at fixed 5% tolerance. Both use the same 16-pin SSOP package and pinout.
Can the LTC2901-4IGN#TRPBF monitor negative voltages?
Yes, the LTC2901-4IGN#TRPBF supports negative voltage monitoring in –ADJ mode on V4 (Pin 13). By connecting an external resistive divider between the negative supply and VREF (Pin 12), the device uses VREF as a level-shift reference to detect undervoltage events down to –18mV, enabling supervision of –48V telecom rails or other negative supplies.
What is the minimum VCC required for reliable operation of the LTC2901-4IGN#TRPBF?
The LTC2901-4IGN#TRPBF guarantees correct RST and COMPX logic states for VCC ≥ 1V, with minimum programming voltage of 2.42V and minimum comparator operation at 2.32V. This allows the LTC2901-4IGN#TRPBF to assert valid reset signals during deep brownout conditions, ensuring safe processor shutdown before logic corruption occurs.
How do I calculate the reset timeout period for the LTC2901-4IGN#TRPBF?
The reset timeout period (tRST) for the LTC2901-4IGN#TRPBF is calculated as tRST = CRT × 4.6ms/nF, where CRT is the capacitance (in nF) connected between Pin 5 (CRT) and GND. For example, a 47nF capacitor yields tRST ≈ 216ms. Leaving CRT unconnected results in a minimum ~50μs delay, while ceramic capacitors are recommended for low leakage and timing accuracy.
LTC2901-4IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 16 Selectable Threshold Combinations
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 5ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC2901-4IGN#TRPBF FAQ
1.How can I place an order for LTC2901-4IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2901-4IGN#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 LTC2901-4IGN#TRPBF reliable?
The price and inventory of LTC2901-4IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2901-4IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2901-4IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2901-4IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2901-4IGN#TRPBF?
LTC2901-4IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2901-4IGN#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 LTC2901-4IGN#TRPBF?
For technical support, including LTC2901-4IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2901-4IGN#TRPBF requirements.
6.How does Aetrix verify that LTC2901-4IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2901-4IGN#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 LTC2901-4IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2901-4IGN#TRPBF?
All LTC2901-4IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2901-4IGN#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 LTC2901-4IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC2901-4IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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