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Analog Devices Inc. LTC2928CUHF#TRPBF
- Part No.:
- LTC2928CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2928CUHF#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 38QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2928CUHF#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. It operates from 2.9V to 16.5V and supports negative supply monitoring via buffered REF output - used in telecom infrastructure power management systems requiring precise multi-rail startup/shutdown control.
For engineers reviewing the LTC2928CUHF#TRPBF datasheet, LTC2928CUHF#TRPBF pinout, LTC2928CUHF#TRPBF application, or LTC2928CUHF#TRPBF equivalent, key selection considerations include cascading capability for >4 supplies, ±1.5% voltage monitor accuracy, charge-pumped EN outputs driving N-channel MOSFETs, configurable sequence timing via external RC networks, and fault-diagnostic reporting via CMP/FLT pins.
Technical Context
The LTC2928CUHF#TRPBF implements a state-machine-based sequencing engine with independent RT1–RT4 time-position decoders, enabling eight discrete enable/disable time slots per channel. Its internal charge pump delivers VCC + 5.5V on EN1–EN4 outputs, directly driving N-channel pass FET gates without level-shifting circuitry.
Supervision uses precision comparators with 1.5% threshold accuracy across –40°C to +85°C, referenced to a buffered 1.189V internal reference (VSEL = VCC). Fault handling includes latched CMP outputs for source identification, system-wide shutdown on any internal/external fault, and configurable RST–FLT interlock via MS1/MS2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.9V to 6.0V - powers core logic; regulated from HVCC when used |
| HVCC Range | 7.2V to 16.5V - enables direct connection to 12V system rails |
| Monitor Accuracy | ±1.5% over –40°C to +85°C - ensures reliable UVLO detection across industrial temp range |
| EN Output Voltage | VCC + 5.5V (typ) - sufficient gate drive for standard N-channel MOSFETs without external boost |
| Sequence Timing Scale | 8.67ms/µF on STMR - sets inter-supply delay (e.g., 3300pF → 29ms) |
| Reset Delay Scale | 4.0ms/µF on RTMR - configures RST assertion hold time after all rails stabilize |
| Package | 38-lead 5mm × 7mm QFN - exposed pad improves thermal performance (θJA = 34°C/W) |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (optional GND connection). Pin 39 is the exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN4 | Charge-pumped enable outputs | Drive N-channel MOSFET gates at VCC + 5.5V; sink 2.5mA low, source ~10µA high |
| V1–V4 | High-impedance voltage monitor inputs | Accept resistive divider outputs; support negative rail monitoring on V1 when VSEL = VCC |
| RT1–RT4 | Time position configuration inputs | Resistor-to-VCC selects one of eight sequencing slots; ground disables channel |
| CAS | Cascade input/output | Chains multiple LTC2928s; master pulls CAS high after ON edge; slaves wait for CAS high before next time slot |
| FLT | Fault status I/O | Pulled low on internal/external fault; accepts external OV signal; requires 10kΩ pull-up |
| DONE | Sequence completion indicator | Open-drain output pulled low at end of sequence-up; high-Z after sequence-down; last device requires 3.3kΩ pull-up to VCC |
| RST | Microprocessor reset output | Active-low reset asserted when any monitored rail falls below UV threshold for configured RTMR delay |
| REF | Buffered reference output | 1.189V ±0.5% output; sources 1mA/sinks 200µA; enables negative supply monitoring via resistor offset |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable architecture | Unlimited supply sequencing via CAS pin chaining - eliminates firmware dependency for complex power trees |
| Configurable sequencing thresholds | SQT1/SQT2 select 10%/33%/67%/100% of reference - supports asymmetric ramp-up/down profiles |
| Fault diagnostics | Latched CMP1–CMP4 outputs identify failed channel(s) - reduces debug time during bring-up and field failure analysis |
| Charge-pumped EN drivers | VCC + 5.5V gate drive - eliminates external level shifters or high-side drivers for N-MOSFET pass devices |
| Wide input voltage range | HVCC operation up to 16.5V - allows direct integration into 12V intermediate bus architectures |
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 timing margins between turn-on events. IC Role / Device Role / Timing Role: LTC2928CUHF#TRPBF acts as hardware-based sequencer controlling enable timing via RT1–RT4 resistors and STMR capacitor; provides UV/OV supervision with 1.5% accuracy. Use Value: Eliminates need for CPLD or firmware-controlled sequencing; ensures compliance with ASIC power-up requirements (e.g., VCCINT before VCCAUX) without software overhead. | Use Scenario: Managing power-up order and fault response for Xilinx Kintex Ultrascale+ FPGA with 5V auxiliary, 12V GTY, 1.8V VCCIO, and 0.85V VCCINT rails. IC Role / Device Role / Timing Role: LTC2928CUHF#TRPBF supervises each rail via V1–V4 dividers, sequences enables using cascaded STMR timing, and asserts RST if VCCINT drops below 0.808V (–5% tolerance). Use Value: Guarantees safe power-up sequence and immediate fault shutdown - prevents latch-up or configuration corruption during brownout events. |
| Industrial PLC Backplane Power | Negative Supply Monitoring in Data Acquisition |
Use Scenario: Controlling 24V system, 5V logic, 3.3V I/O, and isolated 15V analog rails in programmable logic controller backplanes. IC Role / Device Role / Timing Role: LTC2928CUHF#TRPBF uses HVCC for direct 24V input, sequences rails with adjustable delays, and reports faults via FLT/CMP pins to PLC controller. Use Value: Enables deterministic power sequencing across distributed modules; fault latching allows root-cause identification without oscilloscope capture. | Use Scenario: Monitoring –5V and –12V analog supply rails alongside +5V and +3.3V digital rails in high-precision ADC front-ends. IC Role / Device Role / Timing Role: LTC2928CUHF#TRPBF configures V1 for negative rail sensing via REF offset (VSEL = VCC), while V2–V4 monitor positive rails - all with shared 1.5% accuracy. Use Value: Single-chip solution replaces dual-supervisor + discrete level-shifter; REF buffering ensures stable offset for accurate –5V UV detection at 4.925V equivalent. |
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 |
|---|---|---|---|
| TPS65400RGER | Integrated PMIC with buck/boost regulators; only two sequenced enables; no cascade capability; ±2% UV accuracy | Best for compact, low-power systems needing integrated regulation - not suitable for >4 rails or HVCC >6V operation | Select LTC2928CUHF#TRPBF when external discrete regulators require sequencing, HVCC >6V support is needed, or diagnostic fault reporting is critical. |
| MAX16050ATL+ | Four-channel sequencer with 1.8% UV accuracy; no charge-pump EN drivers; requires external level shifters for N-MOSFETs; no REF output for negative rails | Targeted at cost-sensitive industrial applications where negative rail monitoring is unnecessary | Choose LTC2928CUHF#TRPBF when driving N-channel pass FETs directly or monitoring negative supplies via REF is required. |
Compared with TPS65400RGER and MAX16050ATL+, the LTC2928CUHF#TRPBF uniquely combines cascadability for unlimited rail count, charge-pumped EN outputs eliminating external level shifters, and buffered REF enabling accurate negative rail supervision - making it optimal for complex, high-reliability telecom and industrial power systems.
Availability
LTC2928CUHF#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA/ASIC power management, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2928CUHF#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 the LTC portfolio.
The LTC2928 series was designed specifically for hardware-based, firmware-free power supply sequencing and supervision in high-reliability systems where deterministic timing, fault diagnostics, and wide-input-voltage operation are critical.
FAQ
What is the operating temperature range for the LTC2928CUHF#TRPBF?
The LTC2928CUHF#TRPBF is rated for –40°C to +85°C ambient operation, matching the Industrial temperature grade. This is confirmed by the "UHF" package suffix and Order Information table in the datasheet, which specifies the UHF variant as qualified for this extended range - unlike the "CG" SSOP version limited to 0°C to 70°C.
How does the LTC2928CUHF#TRPBF support negative voltage monitoring?
The LTC2928CUHF#TRPBF supports negative rail monitoring on V1 input when VSEL is tied to VCC. In this mode, the internal REF output (1.189V) is used as an offset reference: a resistor divider from the negative rail to REF sets the effective threshold. This enables accurate –5V or –12V undervoltage detection without external op-amps, and is explicitly documented in the Pin Functions section and Applications Information.
Can the LTC2928CUHF#TRPBF drive N-channel MOSFETs directly?
Yes, the LTC2928CUHF#TRPBF drives N-channel MOSFETs directly via its EN1–EN4 outputs, which use an internal charge pump to deliver VCC + 5.5V (typical). This voltage exceeds the gate threshold of standard logic-level N-MOSFETs and eliminates the need for external level shifters or high-side drivers - a key feature confirmed in the Electrical Characteristics table (VEN parameter) and Functional Diagram.
What is the purpose of the CAS pin on the LTC2928CUHF#TRPBF?
The CAS (Cascade) pin on the LTC2928CUHF#TRPBF enables daisy-chaining multiple devices to sequence more than four power supplies. A master LTC2928 pulls CAS high after completing its time slot; slave devices wait for this CAS high signal before advancing to their next time position. This hardware-synchronized method avoids timing skew and eliminates software coordination - fully detailed in the Pin Functions and Timing Diagrams sections.
Does the LTC2928CUHF#TRPBF provide overvoltage protection?
Yes, the LTC2928CUHF#TRPBF provides overvoltage detection on all positive supply inputs (V1–V4) with user-configurable thresholds set via the OVA pin. When any monitored supply exceeds its threshold, the OV pin pulls low and - if connected to FLT - forces all EN outputs low to shut down the system. The OV response time is fixed at 5–7ms (tOV), and threshold accuracy is specified across temperature in the Electrical Characteristics table.
LTC2928CUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- 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:
- 38-QFN (5x7)
LTC2928CUHF#TRPBF FAQ
1.How can I place an order for LTC2928CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2928CUHF#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 LTC2928CUHF#TRPBF reliable?
The price and inventory of LTC2928CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2928CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2928CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2928CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2928CUHF#TRPBF?
LTC2928CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2928CUHF#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 LTC2928CUHF#TRPBF?
For technical support, including LTC2928CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2928CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2928CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2928CUHF#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 LTC2928CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2928CUHF#TRPBF?
All LTC2928CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2928CUHF#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 LTC2928CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2928CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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