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Analog Devices Inc. LTC2928IG#TRPBF
- Part No.:
- LTC2928IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2928IG#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,416
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Product details
Overview
LTC2928IG#TRPBF from Analog Devices (formerly Linear Technology) is a four-channel cascadable power supply sequencer and high-accuracy supervisor IC. It provides staged enable control for up to four supplies per device, 1.5% undervoltage monitor accuracy, and configurable sequencing order/timing via external resistors. It supports both sequence-up and sequence-down operations in telecom infrastructure and multi-rail embedded systems.
For engineers reviewing the LTC2928IG#TRPBF datasheet, LTC2928IG#TRPBF pinout, LTC2928IG#TRPBF application, or LTC2928IG#TRPBF equivalent, key selection criteria include cascading capability for >4 supplies, charge-pumped EN outputs driving N-channel MOSFETs, ±1.5% voltage threshold accuracy, fault event diagnostics via CMP/FLT pins, and support for negative supply monitoring via REF/VSEL.
Technical Context
The LTC2928IG#TRPBF implements a resistor-programmable timing architecture using RT1–RT4 pins to select eight discrete time positions per channel, with STMR setting inter-position delay (8.67 ms/µF). Its internal charge pump generates VCC + 5.5 V on EN1–EN4 outputs, enabling direct drive of N-channel pass FETs without external level shifters.
Supervision uses precision comparators with independent UV/OV thresholds per channel, referenced to either 0.5 V (positive rails) or buffered REF (negative rails when VSEL = VCC). Fault management includes latchable CMP outputs, system-wide shutdown on internal/external faults, and diagnostic reporting via FLT/CMP states during fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.9 V to 6 V - powers internal logic; regulated 3.3 V output available when HVCC used |
| HVCC Range | 7.2 V to 16.5 V - enables high-side biasing and eliminates need for auxiliary supply |
| UV Monitor Accuracy | ±1.5% - ensures reliable reset assertion across temperature and supply variations |
| EN Output Voltage | VCC + 5.5 V typical - sufficient gate drive for standard N-channel MOSFETs without external boost |
| Sequencing Channels | 4 per device, cascadable - supports unlimited supplies via master/slave CAS chaining |
| Operating Temp | –40°C to +85°C - qualified for industrial and telecom environments |
| Package | 36-lead SSOP - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
Package: 36-lead plastic SSOP (5.3 mm), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V4 | Voltage monitor inputs | High-impedance comparator inputs for rail monitoring; V1 supports negative supply sensing when VSEL = VCC |
| EN1–EN4 | Enable outputs | Charge-pumped outputs (VCC + 5.5 V) driving N-MOSFET gates or supply enable inputs |
| CMP1–CMP4 | Comparator status outputs | Open-drain outputs latching fault type/source; weak internal pull-up to VCC |
| FLT | Fault input/output | Active-low system fault indicator; pulled low by internal/external fault conditions |
| DONE | Sequence completion flag | Open-drain output pulled low at end of sequence-up; used for cascading handshake with ON |
| RST | μP reset output | Reset signal asserted when any monitored supply falls below UV threshold for configured delay |
| REF | Buffered reference output | 1.189 V nominal; used to offset negative supply dividers on V1 during sequencing |
| RT1–RT4 | Time position configuration | Resistor-to-VCC selects one of eight enable/disable timing slots per channel |
| STMR/PTMR/RTMR | Timing capacitor inputs | Set sequence delay (8.67 ms/µF), power-good timeout (4 ms/µF), and reset delay (4 ms/µF) |
| ON | Sequence trigger | Rising edge >1.0 V initiates sequence-up; falling edge <0.97 V initiates sequence-down |
| CAS | Cascade interface | Drives next device's ON pin; fixed 13 ms high pulse after ON transition (typical) |
| VSEL | Voltage polarity selector | Tie to VCC for 3 positive + 1 negative rail monitoring; tie to GND for 4 positive rails |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable sequencing | Unlimited supply count via CAS pin chaining between master and slave LTC2928 devices |
| Charge-pumped EN outputs | VCC + 5.5 V gate drive eliminates need for external level-shifting circuitry for N-MOSFETs |
| Configurable sequencing thresholds | SQT1/SQT2 select 10%/33%/67%/100% of reference for sequence-up/down timing points |
| Fault diagnostics | Latched CMP outputs report exact fault source (e.g., UV on V2, OV on V3) without software intervention |
| Negative rail monitoring | VSEL = VCC enables REF-referenced V1 input for accurate –1.2 V, –2.5 V, or –3.3 V supply supervision |
| Margin testing support | RDIS pin forces RST high to simulate supply margining conditions during validation |
Applications
| Telecom Power Systems | Multi-Core Processor Power |
|---|---|
Use Scenario: Sequencing 12 V backplane, 3.3 V I/O, 1.8 V core, and –5 V analog rails in LTE base station line cards. IC Role / Device Role / Timing Role: LTC2928IG#TRPBF acts as primary sequencer/supervisor, coordinating staggered ramp-up to prevent inrush current and ensure proper power domain enable order. Use Value: Eliminates FPGA-based sequencing logic and reduces BOM count by replacing discrete timers, comparators, and MOSFET drivers. | Use Scenario: Managing power-on sequence for quad-core SoC with separate VDDIO (3.3 V), VDDA (2.5 V), VDDCORE (1.1 V), and VDDPLL (1.8 V). IC Role / Device Role / Timing Role: LTC2928IG#TRPBF provides precise timing control via RT resistors and monitors each rail independently for UV/OV faults during boot and runtime. Use Value: Enables deterministic boot timing and immediate fault isolation-critical for meeting PCIe and USB compliance reset windows. |
| Industrial PLC Controllers | Medical Imaging Power Subsystems |
Use Scenario: Controlling 24 V field bus, 5 V logic, 3.3 V MCU, and isolated 15 V analog rails in programmable logic controllers. IC Role / Device Role / Timing Role: LTC2928IG#TRPBF serves as fault-aware sequencer with FLT-driven system shutdown on overvoltage or undervoltage events. Use Value: Meets IEC 61000-4-5 surge immunity requirements by ensuring controlled power-down during transient overvoltage conditions. | Use Scenario: Sequencing high-voltage detector bias (±100 V), analog front-end (±15 V), digital processing (1.2 V), and cooling fan (24 V) in CT scanner subsystems. IC Role / Device Role / Timing Role: LTC2928IG#TRPBF manages safe power-up/down sequences and monitors critical analog rails using REF-referenced V1 for negative bias detection. Use Value: Prevents detector damage by enforcing strict sequencing order and detecting sub-1.5% UV deviations before imaging cycle begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply sequencing and supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS659122ZQW | Integrated PMIC with buck/boost regulators; sequencer is embedded, not standalone; no cascade capability | Best for space-constrained designs needing regulation + sequencing in single package; unsuitable for >4 rails or high-voltage (>6 V) sequencing | Select LTC2928IG#TRPBF when external regulator flexibility, HVCC operation up to 16.5 V, or cascading beyond 4 rails is required |
| MAX16050ATL+ | 4-channel sequencer with 0.8% UV accuracy; no charge-pump EN outputs; requires external level shifters for N-MOSFETs | Lower sequencing accuracy tolerance but higher integration density; lacks negative rail monitoring via REF | Select LTC2928IG#TRPBF when ±1.5% threshold accuracy, integrated gate drive, or negative supply supervision is mandatory |
Compared with TPS659122ZQW and MAX16050ATL+, the LTC2928IG#TRPBF uniquely combines cascadable architecture, charge-pumped EN outputs eliminating external level shifters, and REF-based negative rail monitoring-making it optimal for scalable, high-voltage, multi-rail industrial and telecom systems requiring field-serviceable sequencing logic.
Availability
LTC2928IG#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply and long-term lifecycle support.
Supply support for LTC2928IG#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded ICs including the LTC2928 series.
The LTC2928 product line delivers precision, cascadable power sequencing and supervision for complex multi-rail systems where reliability, fault diagnostics, and design flexibility outweigh integration density requirements.
FAQ
What is the operating temperature range for the LTC2928IG#TRPBF?
The LTC2928IG#TRPBF is specified for operation from –40°C to +85°C, qualifying it for industrial and extended-temperature applications. This range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and applies to all performance parameters marked with the "l" symbol.
How does the LTC2928IG#TRPBF support negative voltage monitoring?
The LTC2928IG#TRPBF supports negative rail monitoring by configuring VSEL = VCC, which enables the REF output (1.189 V nominal) as the reference for the V1 input. An external resistor divider connects the negative supply to V1 and REF, allowing accurate undervoltage detection-for example, –1.2 V with ±1.5% tolerance. This capability is explicitly documented in the Pin Functions and Applications Information sections.
Can multiple LTC2928IG#TRPBF devices be cascaded, and how is this implemented?
Yes, multiple LTC2928IG#TRPBF devices can be cascaded indefinitely using the CAS pin. A master device drives CAS high after its ON-triggered sequence begins; the CAS pulse triggers the ON input of the next slave device, extending sequencing to additional rails. The CAS high time is fixed at ~13 ms (tCAS(HI)), and the protocol is detailed in the Functional Diagram and Applications Information sections of the datasheet.
What is the purpose of the RDIS pin on the LTC2928IG#TRPBF?
The RDIS pin on the LTC2928IG#TRPBF forces the RST output high regardless of monitored supply voltages, enabling supply margin testing. Pulling RDIS high or low disables normal reset generation, allowing engineers to validate system behavior under intentional undervoltage conditions without triggering unintended resets. This function is described in the Pin Functions section and used in the Typical Application diagram.
Does the LTC2928IG#TRPBF require external components for basic sequencing operation?
Yes, the LTC2928IG#TRPBF requires external components for core functionality: RT1–RT4 resistors set enable timing positions; STMR, PTMR, and RTMR capacitors configure sequence delay, power-good timeout, and reset delay; and pull-up resistors on DONE (3.3 kΩ) and FLT (10 kΩ) are mandatory for cascading and fault reporting. These requirements are specified in the Typical Application and Pin Functions sections.
LTC2928IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Sequencer
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 5ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC2928IG#TRPBF FAQ
1.How can I place an order for LTC2928IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2928IG#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 LTC2928IG#TRPBF reliable?
The price and inventory of LTC2928IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2928IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2928IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2928IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2928IG#TRPBF?
LTC2928IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2928IG#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 LTC2928IG#TRPBF?
For technical support, including LTC2928IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2928IG#TRPBF requirements.
6.How does Aetrix verify that LTC2928IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2928IG#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 LTC2928IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2928IG#TRPBF?
All LTC2928IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2928IG#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 LTC2928IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2928IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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