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Analog Devices Inc. LTC2922CF-3.3#TRPBF
- Part No.:
- LTC2922CF-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2922CF-3.3#TRPBF.pdf
- Description:
- IC 5 PWR SUPPLY MONITOR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
LTC2922CF-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 20-pin TSSOP power supply tracker and monitor IC designed for precise sequencing and fault protection of multiple DC/DC outputs. It monitors five supplies (VCC + V1–V4), provides adjustable gate ramp control, integrated remote sense switching, ±1% 0.5V threshold accuracy, and an electronic circuit breaker with 50mV trip voltage - deployed in multi-rail systems such as telecom infrastructure and high-reliability plug-in cards.
For engineers reviewing the LTC2922CF-3.3#TRPBF datasheet, LTC2922CF-3.3#TRPBF pinout, LTC2922CF-3.3#TRPBF application, or LTC2922CF-3.3#TRPBF equivalent, key selection criteria include its 3.3V VCC supply rating, five-channel remote sense switch support, guaranteed 50mV circuit breaker trip accuracy over temperature, and compatibility with logic-level N-channel MOSFETs for supply ramp control.
Technical Context
The LTC2922CF-3.3#TRPBF implements a deterministic six-step power-on sequence: VCC UVLO validation → simultaneous V1–V4 and VCC monitoring → TIMER-initiated delay → GATE ramp-up → remote sense switch activation → PG assertion. Its internal charge pump generates ~9.1V VPUMP (at VCC = 3.3V) to drive external N-channel FET gates above the rail.
It integrates five bidirectional N-channel remote sense switches (S0/D0 through S4/D4), each with <10Ω RDS(FB), enabling automatic IR-drop compensation across multiple DC/DC converters. The circuit breaker uses ∆VSENSE = VCC − VSENSE detection with 1µs pulse width immunity and reset via V1 low-pulse or VCC UVLO recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 2.97V to 3.63V - supports stable operation only within this range; must be connected to highest system rail. |
| V1–V4 Monitor Threshold | 0.492V to 0.508V - ±1% accuracy at 0.5V enables tight tracking of low-voltage rails like 1.2V or 1.8V with precision dividers. |
| Circuit Breaker Trip Voltage | 45mV to 55mV - sets current limit via external RSENSE; 50mV nominal ensures robust short-circuit detection on 3.3V rail. |
| GATE Drive Output Voltage | 8.4V to 9.8V - sufficient to fully enhance logic-level N-MOSFETs (e.g., Si2316DS) when VCC = 3.3V. |
| Remote Sense Switch RDS(FB) | 2Ω to 10Ω - low on-resistance minimizes added voltage drop during feedback path switching for accurate remote sensing. |
| Operating Temperature Range | 0°C to 70°C - commercial-grade thermal envelope suitable for desktop PCs and non-extended industrial environments. |
| Package | 20-lead TSSOP (F package) - surface-mount footprint with 0.65mm pitch; thermal resistance θJA = 90°C/W. |
Pinout & Package
20-lead plastic TSSOP (F package), 4.4mm × 6.5mm body, 0.65mm lead pitch, exposed pad not electrically connected. Pin 1 marked by dot; pin numbering counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 (S0, D0) | Remote Sense Switch 0 terminals | Bidirectional N-FET switch; connects remote sense line after GATE ramp completes; interchangeable pins; tie both to GND if unused. |
| 3–6 (V1–V4) | Supply monitor inputs | Compare input voltages against 0.5V reference; all must be between 0.492V–0.508V and 0.665V–0.735V to proceed; V1 also serves as active-low circuit breaker reset. |
| 7, 8 (S4, D4) | Remote Sense Switch 4 terminals | Fifth integrated switch for remote sensing; tie both to GND if unused. |
| 9, 10 (S3, D3) | Remote Sense Switch 3 terminals | Third dedicated remote sense path; enables independent IR-drop compensation for third supply rail. |
| 11, 12 (S2, D2) | Remote Sense Switch 2 terminals | Second remote sense switch; used to close feedback loop for second monitored supply after GATE ramp. |
| 13, 14 (S1, D1) | Remote Sense Switch 1 terminals | First remote sense switch; activated after GATE reaches full VPUMP; closes feedback path for primary supply. |
| 2 (TIMER) | Timing delay input | Capacitor-to-ground sets two 600ms/µF delays: pre-GATE ramp and post-sense-switch activation before PG assert. |
| 17 (GATE) | Gate drive output | 10µA current source ramps external N-MOSFET gates to ~9.1V; RC network sets ramp rate and suppresses oscillation. |
| 16 (PG) | Power Good output | 4µA current source pulls up to ~9.1V after successful sequence; pulled low on fault, UVLO, or breaker trip; configurable as secondary gate driver. |
| 18 (SENSE) | Circuit breaker sense input | Monitors voltage drop across external RSENSE; trips when ∆V > 50mV for >1µs; tie to VCC to disable breaker. |
| 19 (VCC) | Supply voltage input | Must be connected to highest system rail (3.3V); powers internal circuitry and sets monitor thresholds; bypass with 10µF capacitor. |
| 15 (GND) | Ground reference | Analog and digital ground common point; requires low-impedance PCB connection to minimize noise coupling into sensitive comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Five integrated remote sense switches | Enables simultaneous IR-drop compensation across five independent DC/DC converter feedback paths without external FETs. |
| Adjustable supply ramp rate | Controlled via external RC on GATE pin; allows synchronized soft-start of multiple rails to prevent inrush current and bus droop. |
| Guaranteed ±1% monitor threshold accuracy | Ensures reliable tracking of low-voltage rails (e.g., 1.2V, 1.8V) even under temperature variation, reducing need for margin in divider design. |
| Electronic circuit breaker with 50mV trip | Provides fast, repeatable overcurrent protection on VCC rail using only one external resistor - no current-sense amplifier required. |
| Programmable dual-stage timing delay | Single TIMER capacitor configures both pre-ramp and post-sense delays, simplifying layout and eliminating multiple timing components. |
| Automatic fault recovery with latch reset | Breaker fault cleared by pulsing V1 below 0.5V for >150µs or via VCC UVLO recovery - enables autonomous restart after transient overload. |
Applications
| Desktop PC Motherboard Power Sequencing | Telecom Line Card Multi-Rail Control |
|---|---|
Use Scenario: Coordinating ramp-up of CPU core (1.2V), memory (1.35V), I/O (3.3V), and auxiliary (2.5V) rails on a dense motherboard. IC Role / Device Role / Timing Role: LTC2922CF-3.3#TRPBF acts as master sequencer and monitor, enforcing strict voltage order and tracking tolerance while asserting PG only after all rails stabilize. Use Value: Prevents latch-up and data corruption by ensuring 1.2V rail reaches target before 3.3V rail exceeds 90%, leveraging five independent monitor inputs and programmable delays. |
Use Scenario: Managing redundant 3.3V and 5V DC/DC outputs in a hot-swappable telecom line card with strict fault containment requirements. IC Role / Device Role / Timing Role: LTC2922CF-3.3#TRPBF monitors both primary and backup rails, disables all outputs within microseconds of overvoltage or breaker trip, and asserts PG only when redundancy is verified. Use Value: Achieves sub-100µs fault response using internal comparators and latch logic - faster than microcontroller-based supervision and immune to firmware hangs. |
| Industrial Plug-In Data Acquisition Module | High-Density FPGA Development Platform |
Use Scenario: Powering mixed-signal ADCs (2.5V analog, 1.8V digital), isolated interfaces (3.3V), and microcontroller (3.3V) from a single 5V input with minimal board space. IC Role / Device Role / Timing Role: LTC2922CF-3.3#TRPBF coordinates sequencing, compensates for trace IR drops via remote sense switches, and validates rail integrity before enabling data capture. Use Value: Eliminates need for four discrete supervisory ICs and external sense-FETs - reduces BOM count by ≥7 components while improving measurement accuracy via true remote sensing. |
Use Scenario: Sequencing 12V, 5V, 3.3V, 2.5V, and 1.2V rails for Xilinx Kintex Ultrascale+ FPGA with strict power-up order and voltage tolerance windows. IC Role / Device Role / Timing Role: LTC2922CF-3.3#TRPBF serves as hardware-enforced sequencer, using V1–V4 to validate each rail independently and GATE to drive high-current N-FETs controlling bulk power delivery. Use Value: Guarantees FPGA configuration integrity by enforcing ≤±3% tracking window across all rails during ramp-up - meeting Xilinx DS922 specification without software intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power sequencing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2922IF-3.3#TRPBF | Same functionality but rated for –40°C to 85°C industrial temperature range; higher θJA (90°C/W vs same package). | Suitable for extended-temperature deployments (e.g., outdoor base stations, factory-floor controllers) where ambient exceeds 70°C. | Select LTC2922IF-3.3#TRPBF when operating ambient exceeds 70°C or when long-term reliability under thermal cycling is critical. |
| TPS652860RGER | Integrated PMIC with buck controllers; lacks remote sense switches and independent 5-input monitoring; fixed 0.6V reference. | Targets cost-sensitive, lower-complexity systems where integrated regulation is preferred over discrete FET control. | Choose TPS652860RGER only when replacing entire power tree (not just sequencing), and when remote sensing and ±1% threshold accuracy are not required. |
Compared with LTC2922CF-3.3#TRPBF, the LTC2922IF-3.3#TRPBF offers identical sequencing architecture with extended thermal capability, while the TPS652860RGER trades flexibility and precision for integration and lower component count - making it unsuitable as a drop-in replacement but viable for simplified designs.
Availability
LTC2922CF-3.3#TRPBF is available at Aetrix Electronics and suitable for desktop computers, telecom infrastructure, and instrumentation requiring stable component supply with guaranteed commercial-temperature performance and full traceability.
Supply support for LTC2922CF-3.3#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2922CF-3.3#TRPBF belongs to ADI's Linear Technology legacy power management portfolio, specifically engineered for high-accuracy, hardware-based power supply sequencing and fault protection in multi-rail systems where firmware-independent reliability is mandatory.
FAQ
What is the maximum number of supply rails the LTC2922CF-3.3#TRPBF can monitor and track simultaneously?
The LTC2922CF-3.3#TRPBF monitors five supply rails: VCC plus four additional inputs (V1–V4). It actively tracks all five during power-up using external N-channel FETs driven by the GATE pin and compensates for IR drops via five integrated remote sense switches (S0/D0 through S4/D4), enabling precise coordinated ramping in complex multi-rail systems.
Can the LTC2922CF-3.3#TRPBF operate with a 2.5V VCC supply?
No - the LTC2922CF-3.3#TRPBF is factory-configured for 3.3V VCC operation, with specified supply range 2.97V to 3.63V and internal monitor thresholds scaled accordingly. For 2.5V systems, use LTC2922CF-2.5#TRPBF, which has matching pinout and functionality but calibrated thresholds for 2.5V VCC.
How does the electronic circuit breaker in the LTC2922CF-3.3#TRPBF reset after tripping?
The LTC2922CF-3.3#TRPBF circuit breaker resets either by pulling the V1 pin below 0.490V for more than 150µs after current falls below trip level, or automatically upon recovery from VCC undervoltage lockout (>10µs). Both methods clear the internal fault latch and allow the normal power-on sequence to restart from Step 1.
What is the purpose of the TIMER pin on the LTC2922CF-3.3#TRPBF, and how is it configured?
The TIMER pin on the LTC2922CF-3.3#TRPBF sets two critical delays in the power-on sequence: one before GATE ramp initiation and another before PG assertion. A capacitor from TIMER to GND programs both delays at 600ms/µF; for example, 100nF yields ~60ms delay. The pin must fall below 150mV before each delay cycle begins.
Does the LTC2922CF-3.3#TRPBF require external components to function as a basic sequencer?
Yes - the LTC2922CF-3.3#TRPBF requires at minimum: a 10µF capacitor on VCC, an RC network on GATE to set ramp rate, a resistor between VCC and SENSE for circuit breaker enablement, and a capacitor on TIMER for sequencing delays. External N-channel FETs and resistive dividers for V1–V4 monitoring are also mandatory for full functionality.
LTC2922CF-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Five Power Supply Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 2.97V ~ 3.63V
- Current - Supply:
- 2 mA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
LTC2922CF-3.3#TRPBF FAQ
1.How can I place an order for LTC2922CF-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2922CF-3.3#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 LTC2922CF-3.3#TRPBF reliable?
The price and inventory of LTC2922CF-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2922CF-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2922CF-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2922CF-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2922CF-3.3#TRPBF?
LTC2922CF-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2922CF-3.3#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 LTC2922CF-3.3#TRPBF?
For technical support, including LTC2922CF-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2922CF-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC2922CF-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2922CF-3.3#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 LTC2922CF-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2922CF-3.3#TRPBF?
All LTC2922CF-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2922CF-3.3#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 LTC2922CF-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2922CF-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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