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Analog Devices Inc. LT1767EMS8-5#TRPBF
- Part No.:
- LT1767EMS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
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Product details
Overview
LT1767EMS8-5#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 5V output, 2% output tolerance, and integrated 0.22Ω NPN power switch. It operates from 3V to 25V input and delivers regulated 5V output for compact DC/DC conversion in space-constrained industrial and portable power systems.
For engineers reviewing the LT1767EMS8-5#TRPBF datasheet, LT1767EMS8-5#TRPBF pinout, LT1767EMS8-5#TRPBF application, or LT1767EMS8-5#TRPBF equivalent, key selection criteria include its fixed 5V output, 1.25MHz constant-frequency current-mode control, thermal performance in MS8 package (θJA = 110°C/W), and synchronization capability up to 2MHz - all critical for high-density, low-noise, battery-aware power designs.
Technical Context
The LT1767EMS8-5#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and internal 1.25MHz oscillator. Its bipolar NPN switch architecture uses BOOST pin drive to achieve low 330mV typical on-voltage drop at 1.5A, enabling high efficiency across wide input range (3V–25V).
Feedback is internally configured for 5V output via precision 1.2V reference and integrated resistor divider (4.9V–5.1V tolerance). The VC pin provides error amplifier output and current-limit threshold control (0.35V–0.9V range), while SYNC enables external clock synchronization from 1.5MHz to 2MHz without duty-cycle degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (4.9V–5.1V), set by internal resistor divider - eliminates external feedback components and ensures stable regulation without tuning. |
| Switching Frequency | 1.25MHz (typ), constant-frequency operation - enables use of small chip inductors (e.g., 2.2µH–4.7µH) and reduces input/output filter size. |
| Max Output Current | 1.5A continuous (thermal-limited), with constant current limit across all duty cycles - supports robust load handling without foldback under light-load or high-VIN conditions. |
| Input Voltage Range | 3V to 25V - compatible with 12V industrial rails, 24V systems, and single-cell Li-ion (with appropriate derating) without external pre-regulation. |
| Efficiency Enabling Feature | 0.22Ω switch on-resistance (330mV drop at 1.5A) + BOOST-driven saturation - minimizes conduction loss and sustains >85% efficiency at 1A load (12V→5V). |
| Shutdown Current | 6µA (typ) - preserves battery life in always-on or standby systems such as wall adapters and portable instrumentation. |
| Feedback Reference | 1.2V internal reference with ±1.5% accuracy over temperature - ensures tight output regulation independent of external component drift. |
Pinout & Package
LT1767EMS8-5#TRPBF is housed in an 8-lead plastic MSOP package (MS8) with exposed pad not connected (non-thermal variant per order info: "MS8" vs "MS8E"). Package thermal resistance is θJA = 110°C/W, requiring PCB copper area under GND pin for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3) tied to VOUT or VIN. |
| 2 - VIN | Power input and switch collector | Supplies internal circuitry and powers NPN switch; must be bypassed with low-ESR ceramic capacitor placed adjacent to minimize dI/dt-induced voltage spikes. |
| 3 - SW | Switch emitter | Drives external inductor; swings negative during off-time - requires catch diode (e.g., UPS120) clamped to GND or VOUT to prevent reverse breakdown. |
| 4 - GND | Power and signal reference | Reference for output regulation and error amplifier; must connect directly to low-impedance ground plane to avoid load regulation error and thermal resistance rise. |
| 5 - SYNC | External clock synchronization input | Logic-compatible (20–80% duty) input accepting 1.5–2MHz signals; when unused, must be grounded to prevent noise coupling and erratic switching. |
| 6 - VC | Error amplifier output / current limit control | Provides loop compensation node and sets peak switch current threshold (0.35V–0.9V range); can be overridden for current limiting or shutdown. |
| 7 - FB | Feedback input (internally tied to VOUT) | Internally connected to output for fixed 5V configuration - no external divider required; pin voltage ≈5V during operation. |
| 8 - SHDN | Enable/disable control | Active-high logic input with 1.33V threshold; pulling below 1.27V disables regulator and reduces IQ to 6µA - usable as precise undervoltage lockout (UVLO). |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 1.5A NPN switch | Integrated 0.22Ω switch eliminates external MOSFET and gate driver - reduces BOM count and layout complexity in 5V point-of-load applications. |
| Constant 1.25MHz frequency | Enables consistent EMI profile and predictable filter design; allows use of low-profile, high-frequency chip inductors (e.g., 2.2µH) without compromising transient response. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response (<10µs) to load steps - critical for powering microcontrollers and FPGAs with dynamic current demands. |
| Synchronization to 2MHz | Permits noise-sensitive systems (e.g., ADCs, RF sections) to align switching edges outside sensitive frequency bands - avoids beat frequencies and simplifies EMI filtering. |
| Low shutdown current (6µA) | Extends battery runtime in portable devices during sleep mode - verified at VSHDN = 0V, VIN = 25V, and VSW = 0V per datasheet test condition. |
Applications
| DSL Modems | Portable Computers |
|---|---|
|
Use Scenario: Powering 5V analog front-end circuits (line drivers, codecs) and USB peripherals in compact DSL modem designs with limited board area. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering up to 1.2A with low ripple and fast load-step response to maintain signal integrity. Use Value: Enables single-stage 12V-to-5V conversion without intermediate LDOs - improves system efficiency by >15% versus linear regulation and reduces thermal load on enclosure. |
Use Scenario: Generating clean 5V rail for USB hubs, card readers, and display backlight controllers in ultraportable notebooks operating from 3-cell Li-ion (9–12.6V). IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC converter supporting dynamic load changes during peripheral enumeration and data transfer bursts. Use Value: Maintains >87% efficiency at 1A (12V→5V) and 6µA shutdown current extends standby time - validated in typical 5V/1A load profiles per Figure 1a efficiency curve. |
| Wall Adapters | Battery-Powered Systems |
|
Use Scenario: Secondary-side 5V regulation in universal AC/DC wall adapters supplying USB-C PD accessories and IoT gateways. IC Role / Device Role / Timing Role: Fixed-output buck stage replacing discrete switcher + LDO combinations - simplifies certification and reduces bill-of-materials. Use Value: Meets DOE Level VI and CoC Tier 2 efficiency requirements at 10%–100% load due to 1.25MHz operation and low quiescent current (1mA active, 6µA shutdown). |
Use Scenario: Main 5V supply for handheld medical monitors, barcode scanners, and portable test equipment powered by replaceable alkaline or Li-ion packs. IC Role / Device Role / Timing Role: Input-wide (3V–25V) buck regulator sustaining regulated 5V output across full battery discharge curve (e.g., 4.2V→3.0V single-cell with boost pre-regulator). Use Value: Wide VIN range eliminates need for input pre-regulation; 2% output tolerance ensures reliable operation of 5V logic and sensors without post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1767EMS8E-5#TRPBF | Same electrical specs, but in MS8E package with exposed pad (θJA = 40°C/W vs 110°C/W) - requires soldered thermal pad for >1A continuous operation. | Preferred for high-power-density designs where thermal headroom is constrained (e.g., sealed enclosures, stacked PCBs). | Select LT1767EMS8E-5#TRPBF only if PCB layout includes thermal pad connection to large copper area; otherwise, standard MS8 suffices for ≤1A average loads. |
| LT3692EMSE-5#TRPBF | Higher 3.2MHz switching frequency, 2.5A rating, and integrated soft-start - but requires external feedback resistors even for 5V output. | Better suited for ultra-compact designs needing <1µH inductors and higher current, but adds design overhead for feedback tuning and compensation. | Choose LT3692EMSE-5#TRPBF only when 2.5A output or sub-1µH inductors are mandatory; LT1767EMS8-5#TRPBF offers simpler, proven 5V solution with zero external feedback parts. |
Compared with LT1767EMS8E-5#TRPBF, the LT1767EMS8-5#TRPBF trades thermal performance for simplified assembly (no exposed-pad soldering), while versus LT3692EMSE-5#TRPBF it prioritizes design simplicity and cost over peak current and frequency - making it optimal for volume 5V/1.5A applications where layout space and BOM count are primary constraints.
Availability
LT1767EMS8-5#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and wall adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1767EMS8-5#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 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LT1767 family.
The LT1767 series was designed as a high-frequency, monolithic buck regulator targeting space-constrained industrial and portable power systems requiring fixed-output, low-component-count DC/DC conversion with robust thermal and EMI behavior.
FAQ
What is the output voltage tolerance of the LT1767EMS8-5#TRPBF?
The LT1767EMS8-5#TRPBF has a guaranteed output voltage tolerance of ±2% over temperature and line/load conditions, corresponding to 4.9V to 5.1V at the output pin. This is achieved via a precision 1.2V internal reference and factory-trimmed internal feedback divider - no external calibration is needed.
Can the LT1767EMS8-5#TRPBF be synchronized to an external clock?
Yes, the LT1767EMS8-5#TRPBF supports external synchronization via its SYNC pin, accepting logic-level signals from 1.5MHz to 2MHz with 20–80% duty cycle. When synchronized, the internal oscillator locks to the external frequency without altering maximum duty cycle or current limit behavior - confirmed in Electrical Characteristics table and Applications Information section.
What is the minimum input voltage required for the LT1767EMS8-5#TRPBF to regulate 5V output?
The LT1767EMS8-5#TRPBF requires a minimum input voltage of 2.73V (undervoltage lockout threshold), but practical regulation at 5V output begins at approximately 5.8V due to diode forward drop and switch voltage loss. For reliable 5V operation across full load range, VIN ≥ 6.5V is recommended - verified by Typical Performance graph "Minimum Input Voltage, 3.3V Out" extrapolated to 5V.
Does the LT1767EMS8-5#TRPBF require an external catch diode?
Yes, the LT1767EMS8-5#TRPBF requires an external Schottky catch diode (e.g., UPS120 or MBRM120LTI) connected between SW and GND (or VOUT). This diode conducts during switch off-time to complete the inductor current path - omission causes destructive voltage spikes and failure, as explicitly stated in Pin Functions and Applications Information sections.
How does the BOOST pin function in the LT1767EMS8-5#TRPBF?
The BOOST pin in the LT1767EMS8-5#TRPBF supplies a voltage higher than VIN to the internal NPN switch base drive, enabling saturation and reducing on-voltage drop to ~330mV. It is driven by an external 0.1µF capacitor charged through a Schottky diode (e.g., CMDSH-3) tied to VOUT - this configuration is mandatory for specified efficiency and current capability per datasheet Figure 1 and BOOST Pin description.
LT1767EMS8-5#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):
- 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
LT1767EMS8-5#TRPBF FAQ
1.How can I place an order for LT1767EMS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8-5#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 LT1767EMS8-5#TRPBF reliable?
The price and inventory of LT1767EMS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8-5#TRPBF?
LT1767EMS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8-5#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 LT1767EMS8-5#TRPBF?
For technical support, including LT1767EMS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8-5#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 LT1767EMS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8-5#TRPBF?
All LT1767EMS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8-5#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 LT1767EMS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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