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Analog Devices Inc. LTC2928CG#TRPBF
- Part No.:
- LTC2928CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2928CG#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
LTC2928CG#TRPBF from Analog Devices (formerly Linear Technology) is a four-channel cascadable power supply sequencer and high-accuracy supervisor IC. It performs staged enable/disable sequencing of up to four supplies per device, monitors undervoltage (±1.5% accuracy) and overvoltage conditions, and generates µP reset signals. Used in telecom infrastructure for controlled ramp-up/ramp-down of I/O and core voltages.
For engineers reviewing the LTC2928CG#TRPBF datasheet, LTC2928CG#TRPBF pinout, LTC2928CG#TRPBF application, or LTC2928CG#TRPBF equivalent, key selection criteria include cascading capability for >4 supplies, charge-pumped EN outputs driving N-channel MOSFETs, configurable sequence timing via RT/STMR/PTMR pins, and fault-diagnostic reporting via CMP/FLT pins.
Technical Context
The LTC2928CG#TRPBF implements a state-machine-based sequencing engine with independent time-position control per channel using external resistors on RT1–RT4. Its internal charge pump delivers VCC + 5.5V at EN1–EN4, enabling direct drive of N-channel pass FETs without level-shifting circuitry.
Supervision uses precision comparators with 1.5% threshold accuracy across –40°C to 85°C, supporting both positive and negative supply monitoring (via REF/VSEL). Fault management includes latched CMP outputs, system-wide shutdown on internal/external faults, and diagnostic reporting through FLT/CMP pin states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.9V to 6V - powers internal logic; regulated output when HVCC used |
| HVCC Range | 7.2V to 16.5V - enables single-rail high-voltage biasing without auxiliary supply |
| EN Output Voltage | VCC + 5.5V typical - sufficient gate drive for standard N-channel MOSFETs |
| UV Monitor Accuracy | ±1.5% over full temperature range - ensures reliable reset assertion across operating conditions |
| Sequence Timing Resolution | 8.67ms/µF on STMR - allows precise inter-supply delays from ~100µs to seconds |
| Reset Delay Scale | 4ms/µF on RTMR - supports µP reset hold times from 50µs to >1s |
| Package | 36-lead SSOP (5.3mm) - surface-mount compatible with standard PCB assembly |
Pinout & Package
Package: 36-lead plastic SSOP (5.3mm × 11.2mm), RoHS-compliant, lead-free finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| V1–V4 | Voltage monitor inputs | High-impedance comparator inputs for resistive divider monitoring of up to four supplies |
| EN1–EN4 | Charge-pumped enable outputs | Drive N-channel MOSFET gates or supply enable inputs; output = VCC + 5.5V when active |
| CMP1–CMP4 | Fault-status comparator outputs | Open-drain outputs latching fault type per channel; used for diagnostics during system failure |
| ON | Sequencing trigger input | Rising edge >1.00V initiates sequence-up; falling edge <0.97V initiates sequence-down |
| FLT | Fault input/output | Pulled low by internal fault or external OV signal; forces all EN outputs low and reports fault source |
| DONE | Sequence completion indicator | Open-drain output pulled low after sequence-up completes; used for cascading multiple devices |
| RT1–RT4 | Time-position configuration inputs | Resistor-to-VCC selects one of eight discrete enable/disable timing positions per channel |
| STMR/PTMR/RTMR | Capacitor-based timing inputs | Set sequence delay (8.67ms/µF), power-good timeout (4ms/µF), and reset delay (4ms/µF) |
| CAS | Cascade input/output | Wired-OR connection between master/slave devices to synchronize multi-device sequencing |
| RST | Microprocessor reset output | Asserts low if any monitored supply falls below UV threshold; releases after RTMR delay |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable architecture | Unlimited supply count via CAS pin chaining - eliminates firmware dependency for complex sequencing |
| Charge-pumped EN outputs | VCC + 5.5V drive enables direct control of standard N-channel MOSFETs without external level shifters |
| Configurable sequencing thresholds | SQT1/SQT2 select 10%/33%/67%/100% of reference - supports asymmetric up/down thresholds for robust margining |
| Fault diagnostics | CMP1–CMP4 latch fault status per channel - enables root-cause identification without oscilloscope probing |
| Negative supply monitoring | VSEL = VCC configures V1 for REF-referenced negative rail monitoring - supports ±12V, ±5V, or –3.3V rails |
| System-level fault response | FLT pin asserts on internal error (e.g., timer timeout) or external signal (OV) - guarantees coordinated shutdown |
Applications
| Telecom Power Sequencing | Multi-Rail FPGA/ASIC Power Management |
|---|---|
|
Use Scenario: Sequencing 12V, 3.3V, 2.5V, and 1.2V rails in base station line cards with strict ramp-time and ordering requirements. IC Role / Device Role / Timing Role: LTC2928CG#TRPBF acts as hardware-based sequencer controlling EN1–EN4 to stagger enable timing via RT1–RT4 resistors and STMR capacitor. Use Value: Eliminates FPGA configuration dependency for power-on; ensures compliance with ASIC voltage ramp specifications (e.g., tramp ≤ 10ms). |
Use Scenario: Managing core, I/O, auxiliary, and PLL supplies for Xilinx Kintex Ultrascale+ FPGA with asymmetric up/down thresholds. IC Role / Device Role / Timing Role: LTC2928CG#TRPBF supervises all rails using V1–V4 dividers and generates RST only after all supplies stabilize within ±1.5% UV window. Use Value: Prevents FPGA configuration lockup by guaranteeing 100% valid supply conditions before releasing reset. |
| Industrial PLC Backplane Power | Server CPU VRM Coordination |
|
Use Scenario: Coordinating isolated 24V, 5V, 3.3V, and –5V supplies in programmable logic controller backplanes with safety-critical shutdown. IC Role / Device Role / Timing Role: LTC2928CG#TRPBF uses VSEL = VCC and REF to monitor –5V on V1 while sequencing positives, and asserts FLT on any fault. Use Value: Enables single-point fault detection and simultaneous disable of all rails - meets IEC 61508 functional safety requirements. |
Use Scenario: Synchronizing CPU core (VDD), SoC I/O (VDDIO), memory (VDDQ), and auxiliary (VCCAUX) rails during server boot and thermal throttling events. IC Role / Device Role / Timing Role: LTC2928CG#TRPBF cascades with secondary LTC2928 to extend sequencing beyond four rails and reports faults via CMP outputs to BMC. Use Value: Reduces BIOS complexity by offloading sequencing logic to analog hardware; supports dynamic re-sequencing during runtime. |
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 |
|---|---|---|---|
| TPS659122ZQWR | Integrated PMIC with buck/boost regulators; sequencer is embedded, not standalone | Requires redesign for regulator replacement; no cascading support beyond single-chip limits | Select when board space is constrained and regulation + sequencing must be co-located |
| MAX16050AEEE+ | Four-channel sequencer with 0.8% UV accuracy; no charge-pump EN outputs - requires external level shifters for N-FETs | Limited to 5.5V max EN drive; unsuitable for high-side N-FETs above 6V supply rails | Select when higher UV accuracy is critical and gate drive voltage ≤ 5.5V suffices |
Compared with TPS659122ZQWR and MAX16050AEEE+, the LTC2928CG#TRPBF uniquely combines cascadable architecture, VCC+5.5V charge-pumped EN outputs, and diagnostic CMP latching - making it optimal for systems requiring scalable, hardware-only sequencing with field-serviceable fault diagnosis.
Availability
LTC2928CG#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC backplanes, and FPGA/ASIC power management requiring stable component supply and long-term lifecycle support.
Supply support for LTC2928CG#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 its high-performance analog portfolio, emphasizing precision power management and signal conditioning ICs for demanding industrial and communications applications.
The LTC2928 product line delivers hardware-based, software-free power sequencing and supervision - designed specifically for systems where firmware-controlled sequencing introduces unacceptable boot-time uncertainty or safety risks.
FAQ
What is the operating temperature range for the LTC2928CG#TRPBF?
The LTC2928CG#TRPBF is specified for commercial temperature operation from 0°C to 70°C. This range is confirmed in the Order Information table of the datasheet, where "CG" denotes the commercial grade variant. The device uses internal thermal compensation to maintain ±1.5% undervoltage monitor accuracy across this full range.
How does the LTC2928CG#TRPBF drive N-channel MOSFETs without external level shifters?
The LTC2928CG#TRPBF integrates a charge pump that generates VCC + 5.5V at EN1–EN4 outputs. This voltage exceeds the gate threshold of standard N-channel MOSFETs (e.g., Si7894ADP) even when VCC = 3.3V, delivering ~8.8V gate drive - sufficient to fully enhance logic-level and standard-level devices without external circuitry.
Can the LTC2928CG#TRPBF monitor negative voltage rails?
Yes. When VSEL is tied to VCC, the LTC2928CG#TRPBF configures V1 as a negative rail input referenced to the buffered REF output (1.189V typical). This allows monitoring of rails such as –5V or –3.3V using a resistive divider from V1 to REF, enabling true bipolar supply supervision in a single device.
What happens to EN outputs during a fault condition on the LTC2928CG#TRPBF?
Upon detection of any internal or external fault (e.g., PTMR timeout, OV assertion, or command fault), the LTC2928CG#TRPBF immediately pulls all EN1–EN4 outputs low. This action disables all controlled supplies synchronously, preventing cascading failures. The FLT pin also pulls low to signal the fault event to upstream controllers.
How is sequencing timing configured on the LTC2928CG#TRPBF?
Sequencing timing is set using three external capacitors: STMR sets inter-supply delay (8.67ms/µF), PTMR sets power-good timeout (4ms/µF), and RTMR sets reset assertion delay (4ms/µF). Each EN output's relative timing position is selected independently via resistor values on RT1–RT4, offering eight discrete positions per channel.
LTC2928CG#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC2928CG#TRPBF FAQ
1.How can I place an order for LTC2928CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2928CG#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 LTC2928CG#TRPBF reliable?
The price and inventory of LTC2928CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2928CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2928CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2928CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2928CG#TRPBF?
LTC2928CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2928CG#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 LTC2928CG#TRPBF?
For technical support, including LTC2928CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2928CG#TRPBF requirements.
6.How does Aetrix verify that LTC2928CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2928CG#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 LTC2928CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2928CG#TRPBF?
All LTC2928CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2928CG#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 LTC2928CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2928CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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