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Analog Devices Inc. LTC2900-2IMS#PBF
- Part No.:
- LTC2900-2IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2900-2IMS#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
LTC2900-2IMS#PBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, simultaneously monitoring up to four voltage rails (e.g., 5V, 3.3V, 2.5V, 1.8V), ±1.5% threshold accuracy over temperature, 43µA typical supply current, and adjustable reset timeout via external capacitor. It serves as a system-level power supervisor in multivoltage embedded controllers.
For engineers reviewing the LTC2900-2IMS#PBF datasheet, LTC2900-2IMS#PBF pinout, LTC2900-2IMS#PBF application, or LTC2900-2IMS#PBF equivalent, key selection criteria include guaranteed RST validity down to VCC = 1V, push-pull output drive capability (200µA source, 2.5mA sink), manual reset propagation delay <1µs, and support for both positive/negative adjustable thresholds via external resistor dividers.
Technical Context
The LTC2900-2IMS#PBF implements four independent high-accuracy comparators referenced to a buffered 1.210V internal bandgap, with threshold selection determined by a ratiometric voltage on the VPG pin. Its architecture guarantees glitch immunity and correct RST state during brownout, power-up, and power-down sequences.
Unlike open-drain variants, the LTC2900-2IMS#PBF features an actively driven push-pull RST output tied to V2, enabling direct interface with CMOS logic without external pull-ups. The reset timeout is precisely set by CRT capacitance (217 pF/ms scaling), and manual reset debouncing is integrated via the same timing capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Inputs | Four independent inputs (V1–V4) supporting 16 preset/adjustable combinations including 5V, 3.3V, 2.5V, 1.8V, 1.5V, ADJ, and –ADJ modes |
| Threshold Accuracy | ±1.5% of monitored voltage over full operating temperature range (–40°C to 85°C) |
| RST Output Type | Push-pull active-high/low output referenced to V2, sourcing 200µA at 0.8×V2 and sinking 2.5mA at 0.4V |
| Supply Current | 43µA typical quiescent current enables use in battery-powered and low-power systems |
| Reset Timeout Range | Adjustable from ~50µs (CRT open) to seconds via external CRT capacitor (217 pF/ms scaling) |
| Minimum Operating VCC | Guaranteed RST functionality down to VCC = 1V ensures reliable reset assertion during deep brownout |
| Input Voltage Range | V1–V4 tolerate –0.3V to 7V; RST output rated –0.3V to (V2 + 0.3V) for safe interfacing |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm footprint, 0.5mm pitch), RoHS-compliant, rated for –40°C to 85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V3 | Voltage Input 3 | Monitors third rail; selectable threshold: 2.5V, 1.8V, 1.5V, or ADJ/–ADJ via VPG programming |
| V1 | Voltage Input 1 | Primary input; supports 5V or 3.3V preset thresholds; greater of V1/V2 defines internal VCC |
| CRT | Reset Timing Capacitor Pin | Connects external capacitor to GND; sets reset timeout (tRST = CRT × 217 pF/ms) |
| RST | Reset Output | Push-pull active-low output referenced to V2; no external pull-up required |
| PBR | Manual Reset Input | Active-low pin with internal weak pull-up; debounced using CRT timing capacitor |
| GND | Ground Reference | Analog/digital common return; bypass V1/V2 to this pin with ≥0.1µF capacitors |
| VPG | Programming Voltage Input | Accepts ratiometric divider (VREF–GND) to select one of 16 voltage-monitor configurations |
| VREF | Buffered Reference Output | 1.210V ±1.5% reference; sources/sinks ±1mA; drives VPG divider and negative-adjust circuits |
| V4 | Voltage Input 4 | Fourth rail input; supports 1.8V, 1.5V, ADJ, or –ADJ modes with dedicated comparator |
| V2 | Voltage Input 2 | Secondary input; supports 3.3V, 3V, or 2.5V presets; defines RST pull-up rail and VCC if >V1 |
Key Features
| Feature | Design Value |
|---|---|
| Quad-rail monitoring with single RST output | Reduces board space and BOM count vs. discrete supervisors; simplifies reset coordination across multiple domains |
| 16-programmable threshold combinations | Enables reuse across diverse power architectures (e.g., 5V/3.3V/2.5V/1.8V or 12V/5V/–5V/1.5V) without redesign |
| Push-pull RST output (LTC2900-2 variant) | Eliminates need for external pull-up resistors, reduces rise time to ~206ns, and ensures defined logic state at all times |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset assertion during severe brownout-critical for data integrity in storage and telecom systems |
| Integrated manual reset debouncing | Uses CRT capacitor for timing; removes need for external RC networks or firmware debounce logic |
| Negative voltage monitoring (–ADJ mode) | Supports rail monitoring below ground (e.g., –5V, –12V) using VREF-referenced divider on V4 pin |
Applications
| Desktop & Notebook Computers | Multivoltage Systems |
|---|---|
|
Use Scenario: Monitoring core, I/O, memory, and auxiliary rails (e.g., 5V, 3.3V, 2.5V, 1.8V) during boot and runtime. IC Role / Device Role / Timing Role: System power supervisor asserting active-low RST until all rails stabilize within ±1.5% tolerance. Use Value: Prevents CPU lockup or corrupted BIOS initialization by guaranteeing reset remains asserted until all supplies meet spec. |
Use Scenario: Coordinating power sequencing in FPGA-based systems with mixed 3.3V, 2.5V, 1.2V, and –1.2V rails. IC Role / Device Role / Timing Role: Quad-input supervisor with ADJ/–ADJ modes enabling precise trip points for non-standard voltages. Use Value: Eliminates need for custom resistor networks per rail-single IC configures all thresholds via VPG divider. |
| Telecom Equipment | Network Servers |
|
Use Scenario: Ensuring clean reset during hot-swap events and AC line sags in line cards with 12V, 5V, 3.3V, and –48V rails. IC Role / Device Role / Timing Role: Brownout detector with VCC = 1V minimum operation and glitch-immune comparators. Use Value: Maintains RST assertion through deep undervoltage transients, preventing partial state corruption in packet processors. |
Use Scenario: Supervising redundant power supplies and motherboard rails (5V, 3.3V, 1.8V, 1.5V) in dual-CPU server platforms. IC Role / Device Role / Timing Role: Centralized reset generator with manual reset (PBR) and programmable timeout for POST timing compliance. Use Value: Meets Intel's tRST requirements via CRT capacitor tuning; push-pull RST ensures fast, noise-immune reset release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2901CMS#PBF | 16-lead narrow SSOP package; adds watchdog timer and separate watchdog timeout capacitor (WDT pin) | Required where system-level watchdog supervision (not just power-on reset) is mandated | Select LTC2901CMS#PBF only if watchdog functionality is needed; otherwise LTC2900-2IMS#PBF offers smaller footprint and lower cost |
| LTC1326CMS8#PBF | Triple-supply monitor (5V/3.3V/ADJ); 8-lead SOIC; ±0.75% threshold accuracy; open-drain RST | Suitable for simpler 3-rail systems; lacks fourth input and negative voltage support | Choose LTC1326CMS8#PBF for cost-sensitive 3-rail designs where –ADJ or quad monitoring is unnecessary |
Compared with LTC2901CMS#PBF and LTC1326CMS8#PBF, the LTC2900-2IMS#PBF uniquely balances quad-rail flexibility, push-pull drive, and MSOP compactness-making it optimal for space-constrained multivoltage systems requiring deterministic reset without watchdog overhead.
Availability
LTC2900-2IMS#PBF is available at Aetrix Electronics and suitable for desktop computers, telecom line cards, and network servers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2900-2IMS#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear pioneered high-accuracy supervisory ICs for mission-critical power integrity.
The LTC2900 family was designed for multivoltage digital systems needing configurable, low-power, high-accuracy supply monitoring with minimal external components-targeting computing, communications, and industrial control.
FAQ
What is the function of the CRT pin on the LTC2900-2IMS#PBF?
The CRT pin on the LTC2900-2IMS#PBF sets the reset timeout duration by connecting an external capacitor to ground. With a scaling factor of 217 pF/ms, a 47nF capacitor yields a 216ms reset pulse. Leaving CRT unconnected produces a minimum ~50µs delay. This capacitor also debounces the manual reset (PBR) signal.
How does the LTC2900-2IMS#PBF differ from the LTC2900-1IMS#PBF?
The LTC2900-2IMS#PBF features a push-pull RST output actively driven to V2, while the LTC2900-1IMS#PBF uses an open-drain RST with weak internal pull-up. This means LTC2900-2IMS#PBF requires no external pull-up resistor, achieves faster rise time (~206ns vs. >80µs), and guarantees defined logic states even with high-impedance loads.
Can the LTC2900-2IMS#PBF monitor negative voltages?
Yes-the LTC2900-2IMS#PBF supports –ADJ mode on the V4 pin, enabling negative voltage monitoring (e.g., –5V, –12V). An external resistor divider connects between the negative rail and VREF (1.210V), with the tap fed to V4. The trip point is calculated as VTRIP = VREF × R3/R4, referenced to ground.
What is the minimum VCC required for valid RST operation in the LTC2900-2IMS#PBF?
The LTC2900-2IMS#PBF guarantees correct RST logic state for VCC ≥ 1V. This ensures reliable reset assertion during deep brownout conditions-critical for preserving data integrity in storage controllers and telecom systems where supply collapse may occur below 2V.
How is threshold voltage selection implemented on the LTC2900-2IMS#PBF?
Threshold selection on the LTC2900-2IMS#PBF is performed via the VPG pin, which accepts a ratiometric voltage divider between VREF (1.210V) and GND. Sixteen discrete ratios (e.g., 0.406 for 5V/3.3V/2.5V/1.8V) correspond to specific input combinations, with recommended 1% resistor values provided in the datasheet Table 1.
LTC2900-2IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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:
- 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:
- 10-MSOP
LTC2900-2IMS#PBF FAQ
1.How can I place an order for LTC2900-2IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2900-2IMS#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 LTC2900-2IMS#PBF reliable?
The price and inventory of LTC2900-2IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2900-2IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2900-2IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2900-2IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2900-2IMS#PBF?
LTC2900-2IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2900-2IMS#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 LTC2900-2IMS#PBF?
For technical support, including LTC2900-2IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2900-2IMS#PBF requirements.
6.How does Aetrix verify that LTC2900-2IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2900-2IMS#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 LTC2900-2IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2900-2IMS#PBF?
All LTC2900-2IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2900-2IMS#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 LTC2900-2IMS#PBF part is unused and in its original packaging.
Return procedure for LTC2900-2IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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