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Analog Devices Inc. LTC2901-1CGN#PBF
- Part No.:
- LTC2901-1CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2901-1CGN#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,872
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Product details
Overview
LTC2901-1CGN#PBF from Analog Devices (formerly Linear Technology) is a programmable quad supply monitor IC with open-drain reset output, designed for multivoltage system power sequencing and brownout detection. It simultaneously monitors four independent supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V), offers ±1.5% threshold accuracy over temperature, supports adjustable reset and watchdog timing via external capacitors, and guarantees RST assertion down to VCC = 1V - used in telecom equipment, network servers, and portable battery-powered systems.
For engineers reviewing the LTC2901-1CGN#PBF datasheet, LTC2901-1CGN#PBF pinout, LTC2901-1CGN#PBF application, or LTC2901-1CGN#PBF equivalent, key selection criteria include its 16-pin narrow SSOP package, open-drain RST output, 43μA typical supply current, 16 programmable voltage threshold combinations, and guaranteed glitch immunity during power-up/down transitions.
Technical Context
The LTC2901-1CGN#PBF implements four independent high-accuracy comparators with internal reference scaling, each tied to one of V1–V4 inputs. Thresholds are selected via a resistor divider on VPG, enabling 16 preset or adjustable combinations including ±ADJ modes for positive/negative rail monitoring.
Its reset logic uses an internal timer triggered after all supplies exceed thresholds; delay is set by CRT capacitor (4.6 ms/nF). Watchdog timeout is independently set by CWT capacitor (20 ms/nF), and WDI edge detection clears the timer. The open-drain RST output pulls low when any monitored supply falls below its threshold and remains asserted for the programmed tRST period.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Channels | 4 independent inputs (V1–V4) with individual comparator outputs (COMP1–COMP4) |
| Threshold Accuracy | ±1.5% over full operating temperature range (0°C to 70°C) |
| Reset Output Type | Open-drain RST (LTC2901-1 variant), compatible with external pull-up to any logic rail ≤7V |
| Quiescent Current | 43 μA typical - enables use in ultra-low-power battery-backed systems |
| Minimum Operating VCC | 1 V - ensures reliable reset assertion during deep brownout conditions |
| Package | 16-lead narrow SSOP (GN16), 0.15mm pitch, RoHS-compliant #PBF finish |
| Reset Delay Range | 50 μs (pin open) to >1 s (with large CRT); 47 nF → 216 ms typical |
| Watchdog Timeout Range | 200 μs (pin open) to >1 s (with large CWT); 47 nF → 940 ms typical |
Pinout & Package
Package: 16-lead plastic narrow SSOP (GN16), 5.0 mm × 6.2 mm body, 0.635 mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP3 (Pin 1) | Comparator output for V3 | Active-high, nondelayed signal indicating V3 ≥ threshold; weak pull-up to V2 |
| COMP1 (Pin 2) | Comparator output for V1 | Active-high, nondelayed signal indicating V1 ≥ threshold; weak pull-up to V2 |
| V3 (Pin 3) | Supply input 3 | Accepts 2.5V/1.8V/1.5V/ADJ; high-impedance input for precision threshold setting |
| V1 (Pin 4) | Supply input 1 | Accepts 5V or 3.3V; also contributes to internal VCC (greater of V1/V2) |
| CRT (Pin 5) | Reset timing capacitor node | Connects to GND via capacitor to set tRST = 4.6 ms/nF; open = ~50 μs min |
| RST (Pin 6) | Reset logic output | Open-drain active-low output; pulled low if any VX < threshold, held for tRST |
| WDO (Pin 7) | Watchdog output | Active-low watchdog flag (LTC2901-1 only); pulled low on timeout, cleared by WDI edge or RST low |
| WDI (Pin 8) | Watchdog input | Rising/falling edge resets watchdog timer; requires transition within tWD to prevent WDO assertion |
| CWT (Pin 9) | Watchdog timing capacitor node | Connects to GND via capacitor to set tWD = 20 ms/nF; open = ~200 μs min |
| GND (Pin 10) | Ground reference | Analog/digital common return; bypass V1/V2 to this pin with ≥0.1 μF ceramic caps |
| VPG (Pin 11) | Programming voltage input | Resistive divider tap from VREF to GND selects 1 of 16 voltage combinations |
| VREF (Pin 12) | Buffered reference | 1.210 V ±1.5% buffered output; drives VPG divider and supports ±1 mA load |
| V4 (Pin 13) | Supply input 4 | Accepts 1.8V/1.5V/ADJ/–ADJ; supports negative rail monitoring in –ADJ mode |
| V2 (Pin 14) | Supply input 2 | Accepts 3.3V/3.0V/2.5V; contributes to internal VCC (greater of V1/V2) |
| COMP4 (Pin 15) | Comparator output for V4 | Active-high, nondelayed signal indicating V4 ≥ threshold; weak pull-up to V2 |
| COMP2 (Pin 16) | Comparator output for V2 | Active-high, nondelayed signal indicating V2 ≥ threshold; weak pull-up to V2 |
Key Features
| Feature | Design Value |
|---|---|
| 16 programmable voltage combinations | Enables single-part support for diverse multivoltage systems (e.g., 5V/3.3V/2.5V/1.8V or ADJ/–ADJ variants) without redesign |
| ±1.5% threshold accuracy over temp | Eliminates need for external calibration; ensures deterministic reset behavior across industrial temperature range |
| Adjustable reset & watchdog timing | External CRT/CWT capacitors allow precise tailoring of delay/timing to match processor boot and software loop requirements |
| Glitch-immune comparators | Prevents false resets during transient supply noise or short-duration dips - critical for stable system startup |
| Guaranteed RST operation down to VCC = 1V | Provides fail-safe reset assertion even during severe brownout, protecting system state integrity |
| Individual COMPX outputs per supply | Enables real-time visibility into each rail's status - simplifies debug, diagnostics, and fault isolation in complex PDNs |
Applications
| Desktop & Notebook Computers | Telecom Equipment |
|---|---|
Use Scenario: Monitoring core, I/O, memory, and auxiliary rails during cold boot and dynamic power state transitions. IC Role / Device Role / Timing Role: Quad supply monitor providing synchronized reset assertion and per-rail status flags. Use Value: Ensures CPU and chipset initialize only after all critical voltages stabilize - prevents lockup or corrupted firmware execution. | Use Scenario: Supervising multiple DC/DC converter outputs in line cards and baseband processing units. IC Role / Device Role / Timing Role: Independent voltage supervisor with watchdog for FPGA or DSP activity verification. Use Value: Detects rail collapse or microprocessor hang; triggers hardware reset before service interruption occurs. |
| Network Servers | Portable Battery-Powered Equipment |
Use Scenario: Validating 12V, 5V, 3.3V, and 1.8V rails powering CPUs, NICs, and storage controllers in redundant PSUs. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor with programmable thresholds and open-drain RST for OR-ing reset signals. Use Value: Enables graceful shutdown or failover when any rail drops - improves MTBF and service availability. | Use Scenario: Managing power sequencing and brownout protection in handheld test instruments or medical sensors. IC Role / Device Role / Timing Role: Low-quiescent-current (43 μA) supervisor supporting battery life extension and undervoltage lockout. Use Value: Delivers reliable reset at VCC ≥ 1V while minimizing standby drain - extends usable battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2901-2CGN#PBF | Push-pull RST output (vs open-drain); same pinout, identical monitoring functionality | Preferred where active drive to logic-high is required without external pull-up resistor | Select when system logic levels demand guaranteed VOH without external components |
| TPS3307-33DGNR | Fixed 3.3V/3.3V/3.3V triple monitor (no quad, no adjustability); 200 ms fixed reset delay | Lower-cost option for simple 3.3V-only systems lacking programmability or watchdog | Choose only for non-programmable, triple-rail applications where flexibility is not required |
Compared with LTC2901-2CGN#PBF, the LTC2901-1CGN#PBF provides open-drain RST for flexible voltage-level translation, while TPS3307-33DGNR lacks quad monitoring, adjustable thresholds, and watchdog - making it unsuitable for multivoltage or safety-critical designs requiring configurability.
Availability
LTC2901-1CGN#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 LTC2901-1CGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2901 family was developed by Linear Technology specifically for precision, low-power, programmable supply monitoring in multivoltage computing and communications infrastructure.
FAQ
What is the function of the VPG pin on the LTC2901-1CGN#PBF?
The VPG pin on the LTC2901-1CGN#PBF selects one of 16 voltage threshold combinations via an external resistor divider between VREF and GND. During a ~150 μs programming window after power-up, the device samples VPG voltage and configures V1–V4 comparators accordingly - enabling support for presets like 5V/3.3V/2.5V/1.8V or adjustable modes without changing the LTC2901-1CGN#PBF itself.
Does the LTC2901-1CGN#PBF support negative voltage monitoring?
Yes, the LTC2901-1CGN#PBF supports negative rail monitoring in –ADJ mode on the V4 input. When configured this way, the internal comparator references VREF (1.21 V), allowing trip points such as –1.87 V or –4.64 V using an external resistive divider between the negative supply and VREF - verified in the datasheet's Figure 6 and Table 3 for the LTC2901-1CGN#PBF.
How is the reset timeout period set for the LTC2901-1CGN#PBF?
The reset timeout period for the LTC2901-1CGN#PBF is set by connecting an external capacitor (CRT) between Pin 5 (CRT) and GND. The relationship is linear: tRST ≈ 4.6 ms per nanofarad. For example, a 47 nF capacitor yields ~216 ms delay. Leaving CRT unconnected results in a minimum ~50 μs delay - all values confirmed in the LTC2901-1CGN#PBF's Electrical Characteristics table and Timing Diagrams.
What is the maximum supply voltage the LTC2901-1CGN#PBF can monitor on its V1–V4 inputs?
The absolute maximum rating for V1–V4 inputs on the LTC2901-1CGN#PBF is –0.3 V to +7 V. This allows safe monitoring of higher intermediate rails (e.g., 5 V, 3.3 V) and accommodates transient overshoot up to 7 V without damage - specified in the Absolute Maximum Ratings section of the official LTC2901-1CGN#PBF datasheet.
Can the watchdog timer be disabled on the LTC2901-1CGN#PBF?
Yes, the watchdog timer on the LTC2901-1CGN#PBF is disabled by grounding the CWT pin (Pin 9). With CWT = 0 V, the watchdog circuit is inactive, and WDO remains high regardless of WDI activity - a method explicitly documented in the Applications Information section for the LTC2901-1CGN#PBF and validated in typical application schematics.
LTC2901-1CGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC2901-1CGN#PBF FAQ
1.How can I place an order for LTC2901-1CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2901-1CGN#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 LTC2901-1CGN#PBF reliable?
The price and inventory of LTC2901-1CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2901-1CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2901-1CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2901-1CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2901-1CGN#PBF?
LTC2901-1CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2901-1CGN#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 LTC2901-1CGN#PBF?
For technical support, including LTC2901-1CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2901-1CGN#PBF requirements.
6.How does Aetrix verify that LTC2901-1CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2901-1CGN#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 LTC2901-1CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2901-1CGN#PBF?
All LTC2901-1CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2901-1CGN#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 LTC2901-1CGN#PBF part is unused and in its original packaging.
Return procedure for LTC2901-1CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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