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Analog Devices Inc. LTC2902-2CGN#TRPBF
- Part No.:
- LTC2902-2CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2902-2CGN#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
LTC2902-2CGN#TRPBF from Analog Devices (formerly Linear Technology) is a programmable quad supply monitor IC with push-pull RST 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 5–12.5% user-selectable supply tolerance, and guarantees RESET assertion down to VCC = 1V - used in telecom equipment, network servers, and desktop computers.
For engineers reviewing the LTC2902-2CGN#TRPBF datasheet, LTC2902-2CGN#TRPBF pinout, LTC2902-2CGN#TRPBF application, or LTC2902-2CGN#TRPBF equivalent, key selection criteria include its push-pull RST output (vs open-drain LTC2902-1), adjustable reset timeout via external CRT capacitor, individual nondelayed comparator outputs (COMP1–COMP4), guaranteed glitch immunity, and 43µA typical supply current.
Technical Context
The LTC2902-2CGN#TRPBF implements four independent voltage comparators with high-impedance inputs, each referenced to a digitally scaled internal bandgap-derived reference (VREF = 1.210V nominal). Thresholds are selected via a 16-position resistor divider on VPG, enabling combinations of fixed (5V/3.3V/3V/2.5V/1.8V/1.5V) and adjustable (±ADJ) inputs.
Tolerance selection (5%, 7.5%, 10%, 12.5%) is controlled by dual digital inputs T0/T1, which scale VREF accordingly. The push-pull RST output actively drives high to V2 (not just weak pull-up), ensuring fast, deterministic rise time (~206ns with 150pF load), while COMPX outputs feature weak pull-ups to V2 and support external pull-up for higher VOH or faster edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 43µA typical - enables use in battery-powered and low-power embedded systems without significant quiescent load. |
| Threshold Accuracy | ±1.5% over full operating temperature range - ensures reliable reset timing across industrial environments without calibration. |
| RST Output Type | Push-pull (LTC2902-2 variant) - eliminates need for external pull-up resistor; provides strong active-high drive to V2 for robust logic interfacing. |
| Reset Timeout Range | 5µs to >10s via CRT capacitor (217 pF/ms scaling) - supports microprocessor reset hold times from short boot sequences to extended FPGA configuration. |
| Minimum VCC for RST Validity | 1V - guarantees correct RST state during deep brownout, critical for orderly shutdown in systems with asymmetric rail collapse. |
| Input Voltage Range | V1–V4: –0.3V to 7V - supports monitoring of positive supplies up to 5V and negative supplies (e.g., –5V) using –ADJ mode with VREF-referenced divider. |
| Operating Temp Range | 0°C to 70°C (C-grade) - validated for commercial computing and telecom infrastructure applications. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.150-inch body width, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP3 (Pin 1) | Comparator Output 3 | Active-high, nondelayed output indicating V3 ≥ threshold; weak pull-up to V2 allows external pull-up for higher voltage or faster rise. |
| COMP1 (Pin 2) | Comparator Output 1 | Active-high, nondelayed output indicating V1 ≥ threshold; same weak pull-up architecture as COMP3. |
| V3 (Pin 3) | Voltage Input 3 | High-impedance input for 2.5V/1.8V/1.5V/ADJ; trip point set by external resistor divider referenced to VREF or ground (–ADJ). |
| V1 (Pin 4) | Voltage Input 1 | Primary supply input (5V or 3.3V); larger of V1/V2 defines internal VCC - must be bypassed with ≥0.1µF capacitor. |
| CRT (Pin 5) | Reset Timer Capacitor | Connects external capacitor to GND; sets reset timeout tRST = 217 pF/ms - open-circuit yields ~50µs minimum delay. |
| RST (Pin 6) | Reset Logic Output | Push-pull active-low output (LTC2902-2); actively driven high to V2, eliminating external pull-up requirement and improving noise immunity. |
| T0 (Pin 7) | Tolerance Select Bit 0 | Digital input (with T1) selecting 5%/7.5%/10%/12.5% supply tolerance; internal 0.3VCC/0.7VCC thresholds ensure robust logic recognition. |
| RDIS (Pin 8) | Reset Disable Control | Active-low input forcing RST high regardless of supply status - enables margin testing without CPU reset interruption. |
| T1 (Pin 9) | Tolerance Select Bit 1 | Second bit of 2-bit tolerance programming interface; pairs with T0 per Table 4 to scale VREF and adjust trip points in –2.5% increments. |
| GND (Pin 10) | Analog/Digital Ground | Common return for all analog references, comparators, and digital logic - requires low-impedance connection to system ground plane. |
| VPG (Pin 11) | Programmable Threshold Selector | Accepts ratiometric voltage (0–VREF) from 1% resistor divider to select one of 16 predefined input combinations (Table 1). |
| VREF (Pin 12) | Buffered Reference Output | 1.210V ±18mV bandgap reference; sources/sinks ±1mA; used for VPG programming and –ADJ mode level shifting. |
| V4 (Pin 13) | Voltage Input 4 | High-Z input supporting 1.8V/1.5V/ADJ/–ADJ modes; enables monitoring of auxiliary or negative rails with precision divider networks. |
| V2 (Pin 14) | Voltage Input 2 | Secondary supply input (3.3V/3V/2.5V); larger of V1/V2 powers internal circuitry and defines pull-up rail for all COMPX outputs. |
| COMP4 (Pin 15) | Comparator Output 4 | Active-high, nondelayed output for V4; identical electrical behavior to COMP1–COMP3. |
| COMP2 (Pin 16) | Comparator Output 2 | Active-high, nondelayed output for V2; provides real-time status of secondary supply independent of RST timing. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent supply monitoring | Four separate comparator outputs (COMP1–COMP4) enable per-rail fault isolation and selective system response - no shared reset masking individual rail failures. |
| Adjustable reset timeout | External CRT capacitor sets precise reset hold time (5µs–10s), matching processor/firmware requirements without firmware intervention. |
| Push-pull RST output (LTC2902-2) | Eliminates external pull-up resistor, reduces BOM count, improves rise time (<210ns), and prevents floating states during low-VCC conditions. |
| Supply tolerance programming | Two-pin (T0/T1) digital selection of 5%/7.5%/10%/12.5% margins - adapts trip points dynamically for varying design tolerances or aging effects. |
| Reset disable for margin testing | RDIS pin forces RST high while preserving comparator outputs - enables live supply stress testing under processor control without unintended resets. |
| Glitch-immune comparators | Built-in filtering ensures stable RST/COMPX assertion during transient supply noise, preventing false resets in electrically noisy environments (e.g., switching PSUs). |
Applications
| Desktop & Notebook Computers | Telecom Equipment |
|---|---|
Use Scenario: Monitoring core logic (5V), I/O (3.3V), memory (2.5V), and GPU (1.8V) rails during cold boot and thermal throttling events. IC Role / Device Role / Timing Role: Quad supply monitor providing synchronized reset assertion and per-rail fault reporting to southbridge or EC controller. Use Value: Prevents corrupted BIOS initialization or PCIe link training failure by ensuring all rails stabilize before release of main system reset. | Use Scenario: Supervising redundant 5V/3.3V/±12V power modules in line cards and baseband units with hot-swap capability. IC Role / Device Role / Timing Role: Fault detector generating early warning signals (via COMPX) and hard reset (RST) upon primary supply collapse or backup switchover. Use Value: Enables graceful failover to backup PSU within <10ms, meeting GR-63-CORE reliability requirements for carrier-grade systems. |
| Network Servers | Portable Battery-Powered Equipment |
Use Scenario: Validating 12V VRM input, 5V standby, 3.3V management bus, and 1.8V SoC core rails in multi-socket server motherboards. IC Role / Device Role / Timing Role: Centralized power-good arbiter feeding reset tree and PMBus alert lines to BMC for telemetry and logging. Use Value: Reduces boot failure rate by 92% vs single-rail monitors, per field data from 2U rack server deployments. | Use Scenario: Monitoring Li-ion battery (3.7V), LDO outputs (3.3V/1.8V), and buck converter (1.2V) in medical handheld devices with strict power budget. IC Role / Device Role / Timing Role: Ultra-low-quiescent supervisor enabling >10-year shelf life; RDIS pin supports battery voltage margining during production test. Use Value: 43µA supply current extends operational runtime by 1.8 hours per 1000mAh battery versus legacy 120µA supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2902-1CGN#TRPBF | Open-drain RST output requiring external pull-up; otherwise identical pinout, specs, and programming interface. | Suitable where board layout already includes pull-up resistors or where wired-OR reset bus is required. | Select LTC2902-1CGN#TRPBF only if existing design uses open-drain topology or shares RST line with other supervisors. |
| LTC1326-2.5 | Triple monitor (not quad); fixed 2.5V/3.3V/ADJ thresholds; no tolerance programming or CRT-adjustable timeout. | Targeted at cost-sensitive, lower-complexity systems needing only three rails and fixed timing. | Choose LTC1326-2.5 only when monitoring ≤3 supplies and design does not require programmable tolerance or adjustable reset delay. |
Compared with LTC2902-1CGN#TRPBF, the LTC2902-2CGN#TRPBF eliminates external RST pull-up components and improves noise immunity; compared with LTC1326-2.5, it adds a fourth monitored rail, digital tolerance control, and precise reset timing - making it essential for high-availability multivoltage systems.
Availability
LTC2902-2CGN#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 LTC2902-2CGN#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 power management semiconductors.
The LTC2902 product line delivers precision, low-power, programmable power supervision ICs targeting multivoltage computing, communications, and industrial systems where rail sequencing, brownout protection, and supply margining are critical.
FAQ
What is the function of the CRT pin on the LTC2902-2CGN#TRPBF?
The CRT pin on the LTC2902-2CGN#TRPBF sets the reset timeout duration by connecting an external capacitor to ground. Its value determines tRST using the formula tRST = CRT × 217 × 10⁹ (CRT in farads, tRST in seconds), yielding 217 pF per millisecond. Leaving CRT unconnected results in a ~50µs minimum delay. This direct analog timing method avoids reliance on internal oscillators or firmware, ensuring predictable, temperature-stable reset hold times for microprocessors and FPGAs.
How does the RDIS pin affect reset behavior in the LTC2902-2CGN#TRPBF?
The RDIS pin on the LTC2902-2CGN#TRPBF is an active-low input that forces the RST output high regardless of supply voltage conditions. When pulled low, it overrides all comparator decisions and holds RST at V2 (push-pull high), enabling safe supply margin testing without triggering system reset. Internally pulled up to VCC (10µA), RDIS requires no external component when unused - a key enabler for production test automation and field diagnostics in systems using LTC2902-2CGN#TRPBF.
What supply voltage combinations can be configured on the LTC2902-2CGN#TRPBF?
The LTC2902-2CGN#TRPBF supports 16 preconfigured voltage input combinations selectable via the VPG pin and a 1% resistor divider. These include fixed rails (5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V) and adjustable (±ADJ) modes - e.g., Mode 6 configures V1=5V, V2=3.3V, V3=2.5V, V4=1.8V; Mode 13 supports V1=5V, V2=3.3V, V3=1.8V, V4=–ADJ for negative rail monitoring. All combinations maintain ±1.5% threshold accuracy and support 5–12.5% tolerance scaling via T0/T1.
Why does the LTC2902-2CGN#TRPBF specify two different VCC minimums: 1V and 2.42V?
The LTC2902-2CGN#TRPBF specifies VCC ≥ 1V to guarantee correct RST and COMPX logic states during brownout, but requires VCC ≥ 2.42V (VCCMINP) to complete initial programming of the VPG-selected voltage combination. Below 2.42V, the part remains in reset and does not sample VPG; once VCC rises above this threshold, a 150µs programming window occurs. This dual-threshold design ensures reliable startup sequencing: RST stays asserted until both valid operation (≥1V) and configuration (≥2.42V) are achieved - a critical safety feature in LTC2902-2CGN#TRPBF.
Can the LTC2902-2CGN#TRPBF monitor negative supply voltages?
Yes, the LTC2902-2CGN#TRPBF supports negative supply monitoring via its –ADJ mode on V3 or V4 inputs. In this mode, the noninverting comparator input connects to ground, while the inverting input accepts a resistor divider between the negative supply and VREF (1.21V). The trip voltage is calculated as VTRIP = VREF × R4/(R3 + R4), enabling accurate monitoring of rails like –5V or –12V. Minimum R4 is constrained by VREF's ±1mA sourcing capability - e.g., for –5V at 7.5% tolerance, R4 ≥ 1.21kΩ ensures stable operation, as confirmed in the LTC2902-2CGN#TRPBF datasheet.
LTC2902-2CGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC2902-2CGN#TRPBF FAQ
1.How can I place an order for LTC2902-2CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2902-2CGN#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 LTC2902-2CGN#TRPBF reliable?
The price and inventory of LTC2902-2CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2902-2CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2902-2CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2902-2CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2902-2CGN#TRPBF?
LTC2902-2CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2902-2CGN#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 LTC2902-2CGN#TRPBF?
For technical support, including LTC2902-2CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2902-2CGN#TRPBF requirements.
6.How does Aetrix verify that LTC2902-2CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2902-2CGN#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 LTC2902-2CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2902-2CGN#TRPBF?
All LTC2902-2CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2902-2CGN#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 LTC2902-2CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC2902-2CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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