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Analog Devices Inc. LT1767EMS8-2.5#TRPBF
- Part No.:
- LT1767EMS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8-2.5#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 2.5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
LT1767EMS8-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an 8-pin MSOP package with fixed 2.5V output, 0.22Ω internal NPN switch, and current-mode control. It operates from 3V to 25V input, delivers ±2% output tolerance, and supports synchronization up to 2MHz - ideal for space-constrained battery-powered systems requiring stable low-noise 2.5V rails.
For engineers reviewing the LT1767EMS8-2.5#TRPBF datasheet, LT1767EMS8-2.5#TRPBF pinout, LT1767EMS8-2.5#TRPBF application, or LT1767EMS8-2.5#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the LT1767EMS8-2.5#TRPBF variant.
Technical Context
The LT1767EMS8-2.5#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and internal 1.25MHz oscillator. Its bipolar NPN power switch is driven via BOOST pin to achieve 0.22Ω effective on-resistance and 330mV typical switch voltage drop at –1.5A.
Feedback is internally configured for 2.5V output using a precision 1.2V reference; FB pin is tied directly to VOUT. The VC pin serves as error amplifier output and current-limit threshold input, ranging from 0.35V (light load) to 0.9V (full load), enabling external loop compensation or current clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% over temperature and line - eliminates external resistor divider and ensures stable logic supply for 2.5V I/O domains. |
| Switch Current Limit | 1.5A minimum at 0°C–125°C - enables continuous 1.2A+ output under thermal derating, supporting portable computing and DSL modem loads. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz range) - allows use of compact ≤4.7µH chip inductors and reduces input/output filtering component count. |
| Input Voltage Range | 3V to 25V - supports wide-range inputs including 12V wall adapters, 24V industrial rails, and multi-cell Li-ion batteries with headroom. |
| Shutdown Current | 6µA typical - extends battery life in standby mode for handheld and IoT edge devices without compromising wake-up responsiveness. |
| Feedback Reference | 1.2V internal reference with 2.45V–2.55V output tolerance - guarantees accuracy without external trimming, simplifying BOM and layout. |
| Thermal Resistance θJA | 110°C/W (MS8 package) - requires PCB copper pour on GND pad for reliable 1.2A operation at 125°C junction temperature. |
Pinout & Package
LT1767EMS8-2.5#TRPBF uses an 8-lead plastic MSOP (MS8) package with exposed thermal pad connected to GND. Requires soldering to ≥1 cm² copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; must be connected to VOUT (or VIN) via 0.1µF capacitor + Schottky diode to maintain <0.5V switch drop. |
| 2: VIN | Power switch collector & IC supply | Accepts 3V–25V input; powers internal bias regulator and drives switch; requires local 10µF ceramic bypass near pin to suppress dI/dt spikes. |
| 3: SW | Switch emitter node | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode (e.g., UPS120) clamped to GND to prevent negative voltage beyond –0.8V. |
| 4: GND | Power and signal reference | Internal tab connection; must tie to large PCB copper pour to achieve 110°C/W θJA and ensure stable load regulation and thermal shutdown activation. |
| 5: SYNC | External clock synchronization input | Logic-compatible (1.5–2.2V threshold); accepts 1.5–2MHz external clock to align switching frequency - reduces EMI in noise-sensitive systems. |
| 6: VC | Error amplifier output / current limit control | 0.35V–0.9V analog control node; sets peak switch current; used for loop compensation (capacitor to GND) or external current limiting. |
| 7: FB | Feedback input (internally tied to VOUT) | Connected directly to output for fixed 2.5V version; no external divider needed - eliminates resistor tolerance errors and saves board space. |
| 8: SHDN | Enable/disable control | 1.33V threshold; pull low to reduce quiescent current to 6µA; doubles as accurate UVLO when biased with resistor divider from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| 1.5A integrated NPN switch in MSOP | Enables high-current DC/DC conversion in <3mm × 3mm footprint - replaces discrete buck controllers + MOSFETs in space-critical designs. |
| Constant 1.25MHz switching frequency | Ensures predictable EMI profile and permits use of low-profile, high-frequency chip inductors (e.g., 2.2µH–4.7µH) without ferrite core saturation risk. |
| Current-mode control with cycle-by-cycle limiting | Delivers fast transient response to load steps and inherent short-circuit protection - no external current-sense resistor required. |
| 2% total output voltage tolerance | Guarantees compliance with 2.5V logic supply requirements (e.g., FPGA I/O banks, ADC references) across line, load, and temperature. |
| Synchronizable to 2MHz | Allows EMI reduction through frequency dithering or alignment with system clocks - critical for automotive infotainment and medical imaging subsystems. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering 2.5V PHY interface and DSP core in ADSL/VDSL line cards with 12V or 24V input rails. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 2.5V at up to 1.2A with tight ripple and fast load transient recovery. Use Value: Replaces larger discrete solutions while meeting Telcordia GR-1089 EMI limits due to fixed 1.25MHz frequency and integrated current sensing. |
Use Scenario: Generating 2.5V supply for memory interfaces and USB controller I/O in ultrabooks and 2-in-1 tablets powered by 3S Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency buck converter operating down to 3V input, maintaining regulation during battery discharge from 12.6V to 9V. Use Value: 6µA shutdown current extends standby time; MSOP package fits beneath keyboard bezel; BOOST-driven switch sustains efficiency below 5V input. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary regulation stage in universal AC/DC adapters delivering multiple outputs, where 5V primary rail feeds LT1767EMS8-2.5#TRPBF for clean 2.5V auxiliary supply. IC Role / Device Role / Timing Role: Isolated post-regulator providing low-noise, tightly regulated 2.5V for analog sensors and precision references. Use Value: Fixed 2.5V output eliminates feedback resistor drift; 110°C/W θJA allows convection-cooled operation in enclosed plastic housings. |
Use Scenario: Power management in handheld test equipment (e.g., portable DMMs, oscilloscope probes) requiring 2.5V for ADC front-end and reference buffers. IC Role / Device Role / Timing Role: Main DC/DC converter stepping down 7.4V (2S Li-ion) to 2.5V with minimal quiescent current and thermal rise. Use Value: 1.5A capability supports burst-mode digitizer loads; SYNC pin enables EMI spread-spectrum alignment with master MCU clock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3606EMSE-2.5#PBF | 4MHz synchronous buck, 1.2A, 2.5V fixed, 3mm × 4mm MSOP-10, 95% peak efficiency | Higher frequency enables smaller inductors/caps; synchronous rectification eliminates catch diode; lower IQ (25µA) but no BOOST pin | Select for ultra-compact layouts needing <1µH inductors and zero diode loss - not drop-in due to different pinout and no BOOST requirement. |
| TPS62130ARGTR | 3MHz synchronous buck, 3A, adjustable (0.9V–6V), 3mm × 3mm VQFN-16, 94% peak efficiency | Higher current rating and adjustable output; integrated MOSFETs; requires external feedback resistors for 2.5V setting | Select when future voltage flexibility or >1.5A margin is needed; requires redesign of feedback network and layout - not pin-compatible. |
Compared with LTC3606EMSE-2.5#PBF and TPS62130ARGTR, the LT1767EMS8-2.5#TRPBF offers proven bipolar-switch robustness for high-voltage input (up to 25V), BOOST-assisted saturation for consistent low-drop performance across input range, and simpler fixed-output implementation - making it preferable for industrial and telecom applications where reliability under wide VIN and thermal stress is prioritized over minimum size.
Availability
LT1767EMS8-2.5#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, wall adapters, battery-powered systems, and distributed power architectures requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LT1767EMS8-2.5#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1767 family was designed as a monolithic, high-frequency buck regulator targeting space-constrained, wide-input industrial and telecom power supplies - emphasizing thermal robustness, fixed-output simplicity, and bipolar-switch reliability over synchronous FET integration.
FAQ
What is the maximum continuous output current of the LT1767EMS8-2.5#TRPBF?
The LT1767EMS8-2.5#TRPBF delivers up to 1.2A continuously under typical thermal conditions (θJA = 110°C/W, 25°C ambient, 1 cm² copper pour). At full 1.5A switch current, output is limited by thermal derating above 85°C junction temperature - confirmed by Figure 12's "Maximum Load Current, VOUT = 2.5V" curves showing 1.2A at VIN = 15V and 1.1A at VIN = 24V.
Does the LT1767EMS8-2.5#TRPBF require an external feedback resistor divider?
No, the LT1767EMS8-2.5#TRPBF does not require an external feedback resistor divider. Its FB pin is internally connected to the output to set the fixed 2.5V output, leveraging the internal 1.2V reference and precision resistor network - eliminating external component count, tolerance errors, and PCB layout sensitivity associated with adjustable versions.
Can the LT1767EMS8-2.5#TRPBF operate from a 3.3V input to deliver 2.5V?
Yes, the LT1767EMS8-2.5#TRPBF can operate from a 3.3V input to deliver 2.5V, but requires careful BOOST configuration. Since VOUT = 2.5V < 3.3V, the BOOST diode must connect to VIN (not VOUT) to ensure ≥2.7V headroom for switch saturation - per Applications Information section "BOOST PIN", avoiding under-saturation and excessive switch loss.
What is the purpose of the VC pin on the LT1767EMS8-2.5#TRPBF?
The VC pin on the LT1767EMS8-2.5#TRPBF is the error amplifier output and peak current comparator input. It ranges from 0.35V (no load) to 0.9V (1.5A load), setting the switch current limit threshold. It is used for loop compensation (via capacitor to GND) and can be externally clamped to limit maximum output current - confirmed in PIN FUNCTIONS and Block Diagram sections.
Is the LT1767EMS8-2.5#TRPBF RoHS-compliant and lead-free?
Yes, the LT1767EMS8-2.5#TRPBF is RoHS-compliant and features a lead-free finish, as indicated by the "#TRPBF" suffix per Linear Technology's ordering guide - where "PBF" denotes lead-free, "TR" denotes tape-and-reel packaging, and "#" confirms compliance with JEDEC J-STD-020 moisture sensitivity level 1.
LT1767EMS8-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1767EMS8-2.5#TRPBF FAQ
1.How can I place an order for LT1767EMS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8-2.5#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 LT1767EMS8-2.5#TRPBF reliable?
The price and inventory of LT1767EMS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8-2.5#TRPBF?
LT1767EMS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8-2.5#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 LT1767EMS8-2.5#TRPBF?
For technical support, including LT1767EMS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8-2.5#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 LT1767EMS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8-2.5#TRPBF?
All LT1767EMS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8-2.5#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 LT1767EMS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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