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Analog Devices Inc. LTC2927CTS8#TRMPBF
- Part No.:
- LTC2927CTS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2927CTS8#TRMPBF.pdf
- Description:
- IC POWER SUPPLY CTRLR TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
LTC2927CTS8#TRMPBF from Analog Devices (formerly Linear Technology) is a single-supply power tracking controller IC that enables precise ramp-up and ramp-down sequencing of DC/DC converters without inserting pass elements or degrading transient response. It delivers 0.8V TRACK reference, ±5% current mirror matching between FB and TRACK pins, and supports adjustable ramp rates via external capacitor on RAMP pin - used in FPGA core/I/O supply coordination and multi-rail microprocessor power systems.
For engineers reviewing the LTC2927CTS8#TRMPBF datasheet, LTC2927CTS8#TRMPBF pinout, LTC2927CTS8#TRMPBF application, or LTC2927CTS8#TRMPBF equivalent, key selection criteria include its 8-lead TSOT-23 package, 2.9V–5.5V VCC operating range, open-drain SDO shutdown output, and ability to control tracking direction via ON pin threshold (1.23V ±20mV) with 75mV hysteresis.
Technical Context
The LTC2927CTS8#TRMPBF implements an open-loop current-mirror-based tracking cell that forces the TRACK pin to 0.800V (±30mV) and mirrors ITRACK into FB to modulate the slave supply's feedback node. Its RAMP/RAMPBUF interface supports both internally generated ramps (10μA pull-up/pull-down) and externally driven master signals.
Control logic uses the ON pin's 1.23V threshold with 75mV hysteresis to switch between track-up (ON high) and track-down (ON low) modes. The SDO output asserts low until VCC exceeds 2.5V and ON rises above threshold, enabling coordinated startup of downstream supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.9V to 5.5V - defines minimum input voltage for reliable operation and UVLO release at 2.5V |
| TRACK Voltage | 0.77V to 0.82V - sets precise reference point for current-mirror servo loop controlling slave supply output |
| ON Threshold | 1.210V to 1.250V - determines track-up/track-down transition point; 75mV hysteresis prevents chatter during slow-rising inputs |
| RAMP Current | ±10μA - generates linear ramp slope (dV/dt) when driving external capacitor; sets master signal slew rate |
| FB Clamp Voltage | 1.5V to 2.3V - limits maximum voltage applied to slave supply feedback node, preventing overregulation or latch-up |
| ICC Supply Current | 0.25mA to 1.2mA - ultra-low quiescent draw enables use in always-on sequencing paths without significant power penalty |
| Operating Temp | 0°C to 70°C - commercial-grade thermal range suitable for industrial and embedded computing applications |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (3mm × 1.75mm), RoHS-compliant, exposed pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Supply Input | Power rail input; must be bypassed with 0.1μF capacitor; triggers UVLO and enables internal circuitry above 2.5V |
| SDO (Pin 2) | Open-Drain Shutdown Output | Drives RUN/SS pin of slave supply low until VCC > 2.5V and ON > 1.23V; requires external pull-up |
| FB (Pin 3) | Feedback Control Output | Sinks current into slave supply's feedback node to raise output voltage; clamped at 2.3V max to prevent damage |
| GND (Pin 4) | Ground Reference | Primary return path for all internal currents; connects to system ground plane |
| TRACK (Pin 5) | Tracking Control Input | Servos to 0.8V; current sourced here is mirrored to FB; max 1mA output capability at VCC = 2.9V |
| RAMPBUF (Pin 6) | Ramp Buffer Output | Low-impedance buffered copy of RAMP; drives resistive divider to TRACK; capable of ±2mA drive |
| RAMP (Pin 7) | Ramp Signal Input | Accepts external ramp source or drives CRAMP with ±10μA for internal ramp generation; grounded if unused |
| ON (Pin 8) | Track Direction Control | Digital or analog input; rising edge above 1.23V initiates track-up; falling edge below 1.225V initiates track-down |
Key Features
| Feature | Design Value |
|---|---|
| Open-loop tracking architecture | Eliminates series FETs and avoids impact on slave supply stability or transient response |
| Adjustable ramp rate | Set by external capacitor on RAMP pin and ±10μA internal current source - enables precise timing control |
| Bi-directional tracking | Supports both track-up and track-down profiles via ON pin polarity - required for controlled power-down |
| Integrated shutdown coordination | SDO output synchronizes slave supply enable timing with VCC and ON conditions - prevents premature activation |
| High-impedance idle state | FB and TRACK present >1GΩ impedance after ramp completion - removes controller from DC/DC loop |
Applications
| VCORE and VI/O Supply Tracking | Microprocessor Power Sequencing |
|---|---|
Use Scenario: Coordinating 1.8V I/O and 1.2V core rails of an FPGA during power-up to prevent latch-up. IC Role / Device Role / Timing Role: LTC2927CTS8#TRMPBF acts as tracking controller, generating synchronized ramp signals to ensure |ΔV| ≤ 0.3V between rails. Use Value: Enables compliance with Xilinx/Intel FPGA absolute maximum ratings for inter-rail voltage differential during startup. | Use Scenario: Ensuring 3.3V system clock supply powers up before 1.2V logic block in an ASIC-based controller. IC Role / Device Role / Timing Role: LTC2927CTS8#TRMPBF provides delayed ramp initiation via RTA resistor network to enforce strict sequencing order. Use Value: Prevents metastability and initialization failures by guaranteeing clock availability prior to logic domain activation. |
| Multiple Supply Systems | Point-of-Load Supplies |
Use Scenario: Managing independent 2.5V, 1.8V, and 1.2V rails in a telecom line card with varying load capacitance. IC Role / Device Role / Timing Role: LTC2927CTS8#TRMPBF serves as per-rail tracking controller, each configured with unique ramp rate and offset. Use Value: Eliminates need for complex CPLD-based sequencers while supporting ratiometric, offset, and coincident profiles. | Use Scenario: Fine-tuning output voltage ramp of a 1.0V/30A POL converter near CPU die to minimize EMI during startup. IC Role / Device Role / Timing Role: LTC2927CTS8#TRMPBF injects controlled current into FB node at point-of-load, minimizing trace length sensitivity. Use Value: Reduces noise coupling risk by avoiding long FB trace routing across PCB; maintains regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply tracking applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2928CTS8#TRMPBF | Dual-channel version; identical per-channel specs but integrates two independent tracking controllers in same TSOT-23-8 package | Reduces component count in dual-rail systems; eliminates need for second IC and associated passives | Select when coordinating two supplies from one footprint; not drop-in - requires updated resistor network per channel |
| TPS65023BRSBR | Multi-rail PMIC with integrated DC/DCs and LDOs; includes programmable sequencing but no open-loop tracking cell | Provides full power solution (buck + LDO) with I²C control; lacks analog ramp flexibility and precision TRACK reference | Select when system requires integrated regulators and digital configurability; avoid when analog tracking fidelity or minimal BOM is critical |
Compared with LTC2928CTS8#TRMPBF, the LTC2927CTS8#TRMPBF offers lower cost and simpler layout for single-supply tracking, while TPS65023BRSBR trades analog precision for integration and digital control - making LTC2927CTS8#TRMPBF optimal for high-fidelity, low-component-count sequencing where only one rail needs coordination.
Availability
LTC2927CTS8#TRMPBF is available at Aetrix Electronics and suitable for FPGA power management, microprocessor sequencing, and multi-rail industrial embedded systems requiring stable component supply and long-term manufacturability.
Supply support for LTC2927CTS8#TRMPBF 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, datasheets, and application engineering for legacy Linear parts including the LTC2927 family.
The LTC2927 product line was designed specifically for analog-controlled power supply tracking and sequencing in high-reliability digital systems - emphasizing open-loop accuracy, minimal footprint, and compatibility with existing DC/DC feedback architectures.
FAQ
What is the function of the RAMP pin on the LTC2927CTS8#TRMPBF?
The RAMP pin on the LTC2927CTS8#TRMPBF accepts either an external ramp signal or drives an external capacitor using an internal ±10μA current source to generate a linear ramp voltage. This signal becomes the master reference for tracking control. When unused, it must be grounded to prevent floating node instability. Its voltage range is –0.3V to VCC + 0.3V, and it sources/sinks precisely 10μA during active ramp generation - directly setting dV/dt for the master signal.
How does the LTC2927CTS8#TRMPBF achieve tracking without affecting supply stability?
The LTC2927CTS8#TRMPBF achieves tracking without affecting supply stability by using an open-loop current-mirror architecture: it sources current from the TRACK pin (servo'd to 0.8V) and mirrors it into the FB pin to modulate the slave supply's feedback node. Because no series pass element is inserted and no closed-loop error correction is performed, the LTC2927CTS8#TRMPBF does not interact with the slave supply's compensation network or transient response characteristics.
What is the maximum guaranteed current the TRACK pin can supply in the LTC2927CTS8#TRMPBF?
The TRACK pin of the LTC2927CTS8#TRMPBF is guaranteed to supply at least 1mA when VCC = 2.9V, and up to 70mA under short-circuit conditions. However, design guidance limits continuous operation to ≤1mA to maintain specified accuracy and thermal performance. Exceeding 1mA risks violating the ±5% current mirror matching spec between TRACK and FB, directly impacting tracking precision in the LTC2927CTS8#TRMPBF.
Can the LTC2927CTS8#TRMPBF be used for power-down sequencing as well as power-up?
Yes, the LTC2927CTS8#TRMPBF supports bidirectional tracking: when the ON pin falls below (1.23V – 75mV) ≈ 1.225V, the internal 10μA current source switches from pull-up to pull-down on the RAMP pin, causing the master signal and thus the slave supply to ramp down at the same rate established during power-up. This ensures controlled, coordinated power-down - critical for avoiding reverse-current stress or latch-up in multi-rail ASICs and FPGAs.
What is the purpose of the SDO pin on the LTC2927CTS8#TRMPBF?
The SDO pin on the LTC2927CTS8#TRMPBF is an open-drain output that holds the RUN/SS pin of the slave supply low until both VCC exceeds 2.5V (UVLO release) and the ON pin rises above 1.23V. It pulls low again when both conditions reverse - ensuring the slave supply remains disabled until the LTC2927CTS8#TRMPBF itself is fully powered and enabled. This prevents premature activation of downstream regulators that may lack sufficient input voltage.
LTC2927CTS8#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Power Supply Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 2.9V ~ 5.5V
- Current - Supply:
- 560 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2927CTS8#TRMPBF FAQ
1.How can I place an order for LTC2927CTS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2927CTS8#TRMPBF 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 LTC2927CTS8#TRMPBF reliable?
The price and inventory of LTC2927CTS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2927CTS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2927CTS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2927CTS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2927CTS8#TRMPBF?
LTC2927CTS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2927CTS8#TRMPBF 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 LTC2927CTS8#TRMPBF?
For technical support, including LTC2927CTS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2927CTS8#TRMPBF requirements.
6.How does Aetrix verify that LTC2927CTS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2927CTS8#TRMPBF 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 LTC2927CTS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2927CTS8#TRMPBF?
All LTC2927CTS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2927CTS8#TRMPBF, 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 LTC2927CTS8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2927CTS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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