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Analog Devices Inc. LTC2901-1IGN#PBF
- Part No.:
- LTC2901-1IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2901-1IGN#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
LTC2901-1IGN#PBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with open-drain RST output, adjustable reset and watchdog timers, ±1.5% voltage threshold accuracy over temperature, 43μA typical supply current, and 16-pin narrow SSOP package. It simultaneously supervises four independent supply rails in multivoltage systems such as telecom equipment and network servers.
For engineers reviewing the LTC2901-1IGN#PBF datasheet, LTC2901-1IGN#PBF pinout, LTC2901-1IGN#PBF application, or LTC2901-1IGN#PBF equivalent, key selection criteria include its 5% undervoltage tolerance mode, guaranteed RST assertion down to VCC ≥ 1V, individual nondelayed comparator outputs per supply, glitch immunity, and compatibility with adjustable ±ADJ thresholds for custom trip points.
Technical Context
The LTC2901-1IGN#PBF implements four independent high-accuracy comparators with user-selectable thresholds via external resistor divider on VPG, referencing a buffered 1.210V internal bandgap. Its reset delay (tRST) and watchdog timeout (tWD) are set by external capacitors CRT and CWT, scaling at 4.6ms/nF and 20ms/nF respectively.
It features open-drain RST output with weak internal pull-up to V2 (6μA), individual COMP1–COMP4 outputs active-high with same pull-up, and power-detect logic ensuring correct RST state during brownout. The device guarantees operation with VCC as low as 1V and supports both positive ADJ (0.5V reference) and negative ADJ (VREF-referenced) configurations on V3/V4 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 43μA typical - enables use in battery-powered and ultra-low-power embedded systems without compromising supervision integrity. |
| Threshold Accuracy | ±1.5% over temperature - ensures reliable reset assertion across industrial temperature range without calibration. |
| Reset Output Type | Open-drain RST - allows flexible level-shifting and wired-OR configuration with external pull-up to any rail up to 7V. |
| Reset Delay Range | 50μs to >1s via CRT capacitor - supports microprocessor power-up sequencing requirements from fast logic to complex SoCs. |
| Watchdog Timeout Range | 200μs to >1s via CWT capacitor - configurable to match software execution cycles and fault recovery timing budgets. |
| VCC Operating Minimum | 1V - guarantees valid RST and COMPX logic states during deep brownout, enabling fail-safe system shutdown. |
| Input Voltage Range | V1–V4: –0.3V to 7V - supports monitoring of positive, negative, and adjustable supplies including –ADJ mode down to –18mV trip. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), 0.15mm pitch, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP3 (Pin 1) | Comparator Output 3 | Active-high, nondelayed signal indicating V3 ≥ threshold; weak pull-up to V2 enables direct interfacing with 3.3V/5V logic. |
| COMP1 (Pin 2) | Comparator Output 1 | Active-high, nondelayed signal indicating V1 ≥ threshold; provides real-time status for primary supply without reset delay. |
| V3 (Pin 3) | Voltage Input 3 | Configurable input for 2.5V, 1.8V, 1.5V, or ±ADJ thresholds; high-impedance node accepts external resistive dividers. |
| V1 (Pin 4) | Voltage Input 1 | Primary supply input (5V or 3.3V); also contributes to internal VCC (greater of V1/V2), requiring 0.1μF bypass to GND. |
| CRT (Pin 5) | Reset Delay Programming | Capacitor connection point setting tRST = 4.6ms/nF; open-circuit yields ~50μs minimum delay. |
| RST (Pin 6) | Reset Logic Output | Open-drain, active-low output asserted when any monitored supply falls below threshold; guaranteed low for VCC ≥ 1V. |
| WDO (Pin 7) | Watchdog Output | Active-low watchdog flag (LTC2901-1 variant only); remains low after timeout until cleared by WDI edge or RST low. |
| WDI (Pin 8) | Watchdog Input | Edge-sensitive input (rising/falling) that resets watchdog timer; requires transition within tWD to prevent WDO assertion. |
| CWT (Pin 9) | Watchdog Timeout Programming | Capacitor connection point setting tWD = 20ms/nF; grounding disables watchdog function entirely. |
| GND (Pin 10) | Ground Reference | System ground return for all analog and digital circuitry; must be low-impedance for accurate threshold sensing. |
| VPG (Pin 11) | Program Input | Resistive divider tap selecting one of 16 voltage combinations; sampled once at power-up (~150μs window), no capacitance allowed. |
| VREF (Pin 12) | Buffered Reference | 1.210V ±1.5% bandgap reference sourcing/sinking ±1mA; used for VPG programming and –ADJ offset. |
| V4 (Pin 13) | Voltage Input 4 | Configurable input for 1.8V, 1.5V, ADJ, or –ADJ; supports negative supply monitoring via VREF-referenced divider. |
| V2 (Pin 14) | Voltage Input 2 | Secondary supply input (3.3V, 3V, or 2.5V); contributes to internal VCC and serves as pull-up rail for all logic outputs. |
| COMP4 (Pin 15) | Comparator Output 4 | Active-high, nondelayed signal indicating V4 ≥ threshold; enables independent fault detection on auxiliary or negative rails. |
| COMP2 (Pin 16) | Comparator Output 2 | Active-high, nondelayed signal indicating V2 ≥ threshold; provides immediate visibility into secondary supply health. |
Key Features
| Feature | Design Value |
|---|---|
| 16 Preset/Adjustable Threshold Combinations | Single VPG resistor divider selects exact voltage pairs (e.g., 5V/3.3V/2.5V/1.8V) or ±ADJ modes - eliminates need for multiple discrete supervisors. |
| Individual Nondelayed Monitor Outputs | Four dedicated COMP pins provide real-time, unfiltered status per supply - enables targeted diagnostics and selective subsystem reset. |
| Glitch Immunity & Brownout Robustness | Internal filtering prevents false triggers from transient dips; guaranteed RST assertion down to VCC = 1V ensures safe shutdown during severe undervoltage. |
| Adjustable Reset and Watchdog Timing | External CRT/CWT capacitors allow precise tuning of tRST and tWD - matches processor boot time and firmware watchdog intervals without redesign. |
| ±ADJ and –ADJ Input Modes | V3/V4 support both positive-adjustable (0.5V reference) and negative-adjustable (VREF-referenced) trip points - extends monitoring to nonstandard and bipolar supplies. |
Applications
| Desktop & Notebook Computers | Telecom Equipment |
|---|---|
Use Scenario: Monitoring core logic (5V), I/O (3.3V), memory (2.5V), and CPU core (1.8V) rails during cold start and thermal throttling. IC Role / Device Role / Timing Role: Quad-supply supervisor providing synchronized reset release after all rails stabilize, with individual COMP outputs feeding PMIC fault registers. Use Value: Prevents boot failure due to out-of-spec 1.8V rail by asserting RST until V4 ≥ 1.683V (1.8V/5%), verified across –40°C to 85°C. | Use Scenario: Supervising distributed power modules in line cards, where 3.3V, 2.5V, 1.8V, and –ADJ (–5.2V) supplies feed FPGAs, transceivers, and analog front-ends. IC Role / Device Role / Timing Role: Negative-adjustable supply monitor using VREF-referenced divider on V4 to detect –5.2V rail collapse with ±1.5% accuracy. Use Value: Enables single-chip supervision of bipolar supplies without external op-amps, reducing BOM count and layout area in space-constrained telecom modules. |
| Network Servers | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean power-up sequence for multi-rail server motherboards with 12V, 5V, 3.3V, and 1.2V supplies derived from DC/DC converters. IC Role / Device Role / Timing Role: Programmable supervisor configured via VPG to monitor 5V/3.3V/2.5V/1.8V, with CRT = 47nF yielding 216ms reset delay matching BIOS initialization. Use Value: Eliminates need for discrete RC networks and multiple reset ICs, simplifying compliance with server platform power sequencing specifications. | Use Scenario: Managing power integrity in handheld medical devices where battery voltage sag must trigger controlled shutdown before data corruption. IC Role / Device Role / Timing Role: Low-quiescent-current (43μA) supervisor monitoring main Li-ion (4.2V→3.0V), 3.3V LDO, 1.8V logic, and 1.5V sensor rail. Use Value: Extends battery life by 12+ hours versus higher-IQ alternatives while maintaining ±1.5% threshold accuracy critical for patient safety-critical shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6812HEUK+T | Triple supply monitor (not quad); fixed 3.3V/2.5V/1.8V thresholds; no adjustable reset/watchdog; SOT23-6 package. | Lacks V4 monitoring and programmability - suitable only for simpler 3-rail systems without negative or custom thresholds. | Select when cost and footprint are prioritized over flexibility and fourth-rail coverage. |
| TPS3808G33DBVR | Single-channel supervisor with 3.3V fixed threshold; adjustable reset delay only; no watchdog or multi-rail capability; SOT23-6. | Requires three separate ICs to match LTC2901-1IGN#PBF's quad functionality - increases board area and BOM complexity. | Choose only for minimal single-rail monitoring where quad integration is unnecessary. |
Compared with MAX6812HEUK+T and TPS3808G33DBVR, the LTC2901-1IGN#PBF delivers integrated quad monitoring, ±ADJ capability, and dual adjustable timing in one 16-pin SSOP - reducing component count by 2–3x and enabling compact, high-reliability designs for multivoltage platforms.
Availability
LTC2901-1IGN#PBF 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 LTC2901-1IGN#PBF 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2901 product line was developed by Linear Technology (acquired by ADI in 2017) to address demand for highly accurate, programmable, low-power supply supervision in dense multivoltage systems - especially where space, power budget, and reliability are critical.
FAQ
What is the function of the VPG pin on the LTC2901-1IGN#PBF?
The VPG pin on the LTC2901-1IGN#PBF selects one of 16 predefined voltage threshold combinations (e.g., 5V/3.3V/2.5V/1.8V) via an external 1% resistor divider between VREF and GND. It is sampled once during power-up (~150μs window) and must remain capacitance-free to ensure correct programming of the LTC2901-1IGN#PBF's monitoring configuration.
Does the LTC2901-1IGN#PBF support negative supply monitoring?
Yes, the LTC2901-1IGN#PBF supports negative supply monitoring in –ADJ mode on V4 input. By connecting an external resistive divider between the negative supply and VREF (1.210V), the LTC2901-1IGN#PBF detects undervoltage events down to –18mV with ±1.5% accuracy, enabling supervision of rails like –5.2V or –12V without external amplifiers.
How is the reset delay time set on the LTC2901-1IGN#PBF?
The reset delay time on the LTC2901-1IGN#PBF is set by connecting an external capacitor CRT between Pin 5 (CRT) and GND. The relationship is tRST = 4.6ms/nF; for example, a 47nF capacitor yields a 216ms delay. Leaving CRT unconnected results in ~50μs minimum delay, and ceramic capacitors are recommended for low leakage.
What is the difference between LTC2901-1IGN#PBF and LTC2901-2IGN#PBF?
The LTC2901-1IGN#PBF features an open-drain RST output with weak internal pull-up to V2, while the LTC2901-2IGN#PBF uses an active push-pull RST output pulled to V2. Both share identical monitoring, programming, and timing functions, but the LTC2901-1IGN#PBF allows external level-shifting and wired-OR reset buses, whereas LTC2901-2IGN#PBF offers faster rise times without external components.
Can the LTC2901-1IGN#PBF watchdog timer be disabled?
Yes, the watchdog timer on the LTC2901-1IGN#PBF can be disabled by grounding the CWT pin (Pin 9). When CWT is held at GND, the watchdog circuit is inactive and WDO remains high regardless of WDI activity. This allows designers to retain reset supervision while omitting watchdog functionality in applications where software-level monitoring suffices.
LTC2901-1IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 16 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- 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
LTC2901-1IGN#PBF FAQ
1.How can I place an order for LTC2901-1IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2901-1IGN#PBF 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 LTC2901-1IGN#PBF reliable?
The price and inventory of LTC2901-1IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2901-1IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2901-1IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2901-1IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2901-1IGN#PBF?
LTC2901-1IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2901-1IGN#PBF 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 LTC2901-1IGN#PBF?
For technical support, including LTC2901-1IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2901-1IGN#PBF requirements.
6.How does Aetrix verify that LTC2901-1IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2901-1IGN#PBF 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 LTC2901-1IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2901-1IGN#PBF?
All LTC2901-1IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2901-1IGN#PBF, 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 LTC2901-1IGN#PBF part is unused and in its original packaging.
Return procedure for LTC2901-1IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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