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Analog Devices Inc. LT1767EMS8E#TRPBF
- Part No.:
- LT1767EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:14,129
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Product details
Overview
LT1767EMS8E#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an exposed-pad MSOP-8 package. It integrates a 0.22Ω NPN power switch, current-mode control loop, and 1.2V feedback reference, delivering fixed 3.3V output with ±2% tolerance across 3V–25V input. It targets compact, high-efficiency DC/DC conversion in battery-powered systems and wall adapters.
For engineers reviewing the LT1767EMS8E#TRPBF datasheet, LT1767EMS8E#TRPBF pinout, LT1767EMS8E#TRPBF application, or LT1767EMS8E#TRPBF equivalent, key selection criteria include its constant-frequency current-mode architecture, thermal performance enabled by the exposed GND pad, synchronization capability up to 2MHz, and validated 3.3V fixed-output regulation without external feedback resistors.
Technical Context
The LT1767EMS8E#TRPBF implements a fixed-frequency (1.25MHz nominal), current-mode buck topology with cycle-by-cycle peak current limiting and internal slope compensation. Its BOOST pin enables saturation of the integrated bipolar NPN switch via external capacitor-diode charge pump, reducing conduction loss to ~330mV at 1.5A.
It features a dedicated VC pin for error amplifier output and current limit threshold control, a 1.33V SHDN comparator with 7µA hysteresis for precise undervoltage lockout, and SYNC pin compatibility with 20–80% duty-cycle external clocks up to 2MHz - all operating across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over line, load, and temperature - eliminates need for external feedback divider. |
| Switch Current Limit | 1.5A minimum over full temperature range - enables robust 1.2A continuous output with thermal derating. |
| Switching Frequency | 1.25MHz typical, synchronizable to 2MHz - allows use of small chip inductors (e.g., 2.2–4.7µH) and low-profile ceramics. |
| Input Voltage Range | 3V to 25V - supports wide-range inputs including 12V industrial rails and multi-cell Li-ion batteries. |
| Feedback Reference | 1.2V internal reference - sets output accuracy and enables stable regulation even with low-ESR ceramic output capacitors. |
| Shutdown Current | 6µA typical - preserves battery life in portable systems during standby or deep-sleep modes. |
| Thermal Resistance θJA | 40°C/W (MS8E exposed-pad package) - enables 1.5A operation at ambient up to 85°C with minimal copper area. |
Pinout & Package
The LT1767EMS8E#TRPBF uses an 8-lead plastic MSOP package with exposed GND pad (MS8E), optimized for low thermal resistance (θJA = 40°C/W) when soldered to ≥1 cm² PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Charge-pump voltage supply for switch driver | Provides >VIN drive to saturate internal NPN; requires external 0.1µF capacitor and Schottky diode tied to VOUT or VIN. |
| VIN | Input power and internal bias supply | Connects to collector of internal NPN switch; must be bypassed with low-ESR ceramic capacitor near pin. |
| SW | Switch emitter node | Drives inductor; swings negative during off-time - requires external catch diode (e.g., UPS120) clamped to GND. |
| GND | Power and signal reference | Exposed pad is electrically connected to GND; must be soldered to large copper pour for thermal and ground integrity. |
| SYNC | External clock synchronization input | Logic-compatible input; accepts 1.5–2MHz external signal to override internal oscillator; float or tie to GND if unused. |
| VC | Error amplifier output / current limit control | Used for loop compensation; also sets peak switch current threshold (0.9V = 1.5A); can be driven to GND to force shutdown. |
| FB | Feedback sense input | Internally connected to 3.3V output - no external resistor network required for this fixed-output variant. |
| SHDN | Enable/disable control | 1.33V threshold; pull ≥1.4V to enable, ≤1.27V to disable; provides accurate UVLO when used with resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A, 0.22Ω NPN switch | Enables high-efficiency step-down conversion without external MOSFET or driver, reducing BOM count and layout complexity. |
| Constant 1.25MHz switching frequency | Ensures predictable EMI profile and permits consistent filter design using miniature surface-mount inductors and ceramics. |
| Current-mode control with slope compensation | Delivers fast transient response and inherent stability across all duty cycles - no external compensation needed for standard designs. |
| Exposed thermal pad (MS8E) | Reduces junction-to-ambient thermal resistance to 40°C/W - supports full 1.5A switch current in compact space-constrained layouts. |
| Synchronization to 2MHz external clock | Allows EMI frequency shifting and noise avoidance in sensitive systems; maintains constant maximum switch current during sync. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering 3.3V logic and PHY circuitry from 12V or 5V intermediate rail in compact DSL line cards. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator with integrated switch and current-mode control. Use Value: Enables high-density board layout with minimal external components (no feedback resistors, small 2.2µH inductor, 0.1µF BOOST cap). | Use Scenario: Generating stable 3.3V core voltage for USB controllers and I/O interfaces in battery-powered notebooks. IC Role / Device Role / Timing Role: Efficient buck converter operating from Li-ion (8–12.6V) or adapter input, supporting dynamic load steps. Use Value: Delivers >90% efficiency at 1A load while maintaining <6µA shutdown current to extend battery runtime. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary-side regulation in universal-input AC/DC adapters delivering regulated 3.3V output. IC Role / Device Role / Timing Role: Isolated DC/DC post-regulator accepting 5–24V input from primary-side controller. Use Value: High PSRR and fast transient response suppress ripple from upstream flyback stages, improving system noise margin. | Use Scenario: Powering microcontrollers and sensors in handheld test equipment or medical monitors running from 2–3 cell Li-ion packs. IC Role / Device Role / Timing Role: Main system regulator with UVLO configured via SHDN pin to prevent brownout during battery discharge. Use Value: Precise 1.33V SHDN threshold and 7µA hysteresis allow clean start-up and graceful shutdown at defined battery voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#TRPBF | 42V input, 1.2A output, 3mm × 4mm MSOP-10, integrated MOSFETs, 3.3V fixed option available | Higher input voltage rating and lower max output current; requires different PCB footprint and layout | Select when input exceeds 25V or higher reliability under surge conditions is required. |
| TPS54331DR | 28V input, 3A output, SOIC-8, adjustable output only, requires external feedback resistors | Higher current capability but lacks fixed 3.3V version; needs additional resistors and compensation components | Select when >1.5A output or adjustable output voltage is needed, and board space allows SOIC-8 placement. |
Compared with LTC3632EMSE#TRPBF and TPS54331DR, the LT1767EMS8E#TRPBF offers optimal integration for 3.3V fixed-output applications at 1.5A within 3V–25V input, with minimal external parts and superior thermal performance in the MS8E package - making it ideal for space- and efficiency-critical designs where input voltage stays below 25V.
Availability
LT1767EMS8E#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered systems requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for LT1767EMS8E#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 and power management portfolio. Linear Technology was renowned for precision DC/DC converters and rugged industrial-grade ICs.
The LT1767EMS8E#TRPBF belongs to Linear's monolithic buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in space-constrained and thermally demanding applications - emphasizing integration, thermal robustness, and ease of use.
FAQ
What is the output voltage configuration of the LT1767EMS8E#TRPBF?
The LT1767EMS8E#TRPBF is a fixed-output variant delivering 3.3V ±2% regulated output. Its FB pin is internally connected to the output, eliminating the need for external feedback resistors. This configuration simplifies design, improves accuracy, and reduces component count compared to adjustable versions like the LT1767EMS8#TRPBF.
Does the LT1767EMS8E#TRPBF require an external catch diode?
Yes, the LT1767EMS8E#TRPBF requires an external Schottky catch diode (e.g., UPS120 or MBRM120LTI) connected between SW and GND. The internal NPN switch lacks a body diode, and the diode conducts during switch-off time to complete the inductor current path. Omitting it will cause destructive voltage spikes and regulator failure.
How does the BOOST pin function in the LT1767EMS8E#TRPBF?
The BOOST pin on the LT1767EMS8E#TRPBF supplies elevated gate drive voltage to the internal NPN switch, enabling saturation and minimizing conduction loss (~330mV at 1.5A). It requires a 0.1µF capacitor and Schottky diode (e.g., CMDSH-3); the diode anode is typically tied to VOUT for 3.3V outputs, providing ~6.3V boost above VIN.
Can the LT1767EMS8E#TRPBF be synchronized to an external clock?
Yes, the LT1767EMS8E#TRPBF supports 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 while preserving constant 1.5A switch current limit and stable current-mode operation.
What thermal considerations apply to the LT1767EMS8E#TRPBF package?
LT1767EMS8E#TRPBF uses the MS8E package with an exposed GND pad offering θJA = 40°C/W. To achieve rated 1.5A output, the pad must be soldered to ≥1 cm² of inner-layer or bottom-side copper pour. Insufficient copper area increases junction temperature, triggering thermal shutdown or reducing maximum sustainable load current.
LT1767EMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 22.5V
- 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-EP
LT1767EMS8E#TRPBF FAQ
1.How can I place an order for LT1767EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E#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 LT1767EMS8E#TRPBF reliable?
The price and inventory of LT1767EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E#TRPBF?
LT1767EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E#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 LT1767EMS8E#TRPBF?
For technical support, including LT1767EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E#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 LT1767EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E#TRPBF?
All LT1767EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E#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 LT1767EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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