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Analog Devices Inc. LT1767EMS8E-1.8#PBF
- Part No.:
- LT1767EMS8E-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-1.8#PBF.pdf
- Description:
- IC REG BCK SEPIC 1.8V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,070
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Product details
Overview
LT1767EMS8E-1.8#PBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an exposed-pad MSOP-8E package, featuring a fixed 1.8V output, 0.22Ω internal NPN switch, 2% output tolerance, and operation from 3V to 25V input. It delivers high efficiency in space-constrained battery-powered systems and wall adapters.
For engineers reviewing the LT1767EMS8E-1.8#PBF datasheet, LT1767EMS8E-1.8#PBF pinout, LT1767EMS8E-1.8#PBF application, or LT1767EMS8E-1.8#PBF equivalent, key selection criteria include its constant-frequency current-mode control, thermal performance enabled by the exposed GND pad, synchronization capability up to 2MHz, and fixed-output configuration eliminating external feedback resistors.
Technical Context
The LT1767EMS8E-1.8#PBF implements a current-mode buck architecture with cycle-by-cycle peak current limiting and a 1.25MHz internal oscillator. Its bipolar NPN power switch is driven via the BOOST pin to achieve low on-resistance (0.22Ω typ.) and high saturation efficiency across input voltages from 3V to 25V.
Feedback is internally configured for 1.8V output - the FB pin is tied directly to VOUT, eliminating external resistor networks. The VC pin serves as both error amplifier output and current limit threshold reference, enabling loop compensation and optional current clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over temperature and line/load - eliminates need for external feedback divider and ensures stable low-voltage core supply. |
| Switch Current Limit | 1.5A minimum at 0°C–125°C - enables robust 1.2A continuous output under thermal derating, supporting portable computing loads. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz over temp) - allows use of compact chip inductors (e.g., 2.2µH–4.7µH) and reduces input/output filtering footprint. |
| Input Voltage Range | 3V to 25V - supports single-cell Li-ion (3.0–4.2V), 5V/12V rails, and industrial 24V systems without external pre-regulation. |
| Shutdown Current | 6µA max - extends battery life in standby mode for handheld and IoT devices. |
| Thermal Resistance θJA | 40°C/W (MS8E exposed pad) - enables 1.2A operation at +85°C ambient with minimal copper area, unlike 110°C/W MS8 variant. |
| Feedback Reference | Internally trimmed 1.764V–1.836V at FB pin - matches 1.8V output specification with no external components required. |
Pinout & Package
LT1767EMS8E-1.8#PBF uses an 8-lead plastic MSOP package with exposed GND pad (MS8E), optimized for thermal dissipation. The exposed pad must be soldered to a large PCB copper area for θJA = 40°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires 0.1µF ceramic cap and Schottky diode (e.g., CMDSH-3) tied to VOUT or VIN. |
| 2: VIN | Main power input | Supplies internal bias regulator and collector of NPN switch; must be bypassed with low-ESR ceramic cap placed adjacent to pin. |
| 3: SW | Switch emitter node | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode (e.g., UPS120) to clamp negative swing. |
| 4: GND | Power and signal reference | Exposed pad is electrically connected to this pin; must be soldered to ≥1 cm² copper pour for thermal and ground integrity. |
| 5: SYNC | External clock synchronization input | Logic-level compatible (20–80% duty); accepts 1.5–2MHz signals to align switching frequency and reduce EMI in multi-rail systems. |
| 6: VC | Error amplifier output / current limit control | Sets peak switch current threshold (0.35V–0.9V range); used for loop compensation or external current limiting override. |
| 7: FB | Feedback input | Internally connected to 1.8V output; no external divider needed - simplifies layout and improves regulation accuracy. |
| 8: SHDN | Enable/disable control | Active-high logic input; 1.33V threshold enables precise undervoltage lockout (UVLO) when paired with resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 1.5A NPN switch | Integrated 0.22Ω on-resistance switch eliminates external MOSFET and driver, reducing BOM count and board area. |
| Constant 1.25MHz switching | Enables use of small, low-profile inductors (e.g., 2.2µH) and ceramic capacitors, cutting solution size vs. lower-frequency alternatives. |
| Exposed-pad MS8E thermal design | 40°C/W junction-to-ambient enables 1.2A continuous output at +85°C ambient with standard 2-layer PCB copper. |
| Current-mode control | Delivers fast transient response to load steps (e.g., CPU burst modes) and inherent cycle-by-cycle overcurrent protection. |
| Fixed 1.8V output configuration | Removes FB resistor network, improving output accuracy (±2%), reducing component count, and eliminating layout sensitivity. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering FPGA I/O banks and PHY interfaces requiring clean, regulated 1.8V from 5V or 12V system rail. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.8V at up to 1.2A with low ripple and fast transient recovery. Use Value: High-frequency operation minimizes filter component size; exposed pad ensures thermal stability during sustained data transmission bursts. |
Use Scenario: Supplying 1.8V core voltage to low-power microcontrollers or memory subsystems in battery-operated handheld devices. IC Role / Device Role / Timing Role: Efficient DC-DC converter operating from single-cell Li-ion (3.0–4.2V) with ultra-low shutdown current. Use Value: 6µA shutdown current extends battery runtime; fixed output eliminates calibration drift and improves long-term voltage accuracy. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary regulation stage in universal-input AC/DC adapters delivering 1.8V auxiliary power for USB-C PD controllers or sensors. IC Role / Device Role / Timing Role: High-efficiency buck converter accepting wide-input 5–25V DC, rejecting line noise, and maintaining tight output tolerance. Use Value: 2% output tolerance and 1.25MHz switching ensure compliance with USB-C power delivery auxiliary rail specifications. |
Use Scenario: Powering 1.8V logic in remote sensors or wireless transceivers powered by coin cells or energy-harvesting sources. IC Role / Device Role / Timing Role: Low-quiescent-current regulator supporting intermittent operation with rapid wake-up from shutdown mode. Use Value: 6µA shutdown current and 1mA operating supply current maximize usable energy from low-capacity batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE-1.8#PBF | 42V input rating, 2A switch, 2MHz sync capability, integrated power-good flag; larger 12-lead MSE package. | Supports higher input voltages (e.g., automotive 24V) and heavier loads; adds PG output for system sequencing. | Select when input exceeds 25V or when power-good signaling is required; not drop-in due to different pinout and package. |
| TPS62130ARGTR | 3–17V input, 3A switch, 2.5MHz fixed frequency, 0.55mΩ FET, 1.8V fixed output; 16-pin QFN with thermal pad. | Higher current capability and lower RDS(on); requires external compensation but offers better light-load efficiency via DCS-Control™. | Select for higher output current (>1.5A) or tighter light-load regulation; requires PCB redesign due to QFN footprint and pin assignment. |
Compared with LT1767EMS8E-1.8#PBF, LT3652EMSE-1.8#PBF extends input voltage range and adds system monitoring, while TPS62130ARGTR trades bipolar simplicity for higher efficiency and current at the cost of increased design complexity and layout change.
Availability
LT1767EMS8E-1.8#PBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and wall adapters requiring stable component supply, consistent thermal performance, and long-lifecycle availability.
Supply support for LT1767EMS8E-1.8#PBF 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 technical and manufacturing continuity for legacy Linear power products.
The LT1767 family was designed as a high-frequency, thermally optimized monolithic buck regulator targeting space- and efficiency-critical applications in portable, industrial, and telecom infrastructure equipment.
FAQ
What is the maximum continuous output current of the LT1767EMS8E-1.8#PBF?
The LT1767EMS8E-1.8#PBF delivers up to 1.2A continuous output current at +85°C ambient with adequate PCB copper area on the exposed pad. This is derived from its 1.5A minimum switch current limit, adjusted for thermal derating in the MS8E package's 40°C/W θJA configuration. At +25°C, full 1.5A is achievable with proper heatsinking.
Does the LT1767EMS8E-1.8#PBF require external feedback resistors?
No. The LT1767EMS8E-1.8#PBF integrates the feedback divider for 1.8V output; the FB pin is internally connected to VOUT. This eliminates external resistors, improves output accuracy to ±2%, and removes layout sensitivity - a key distinction from the adjustable LT1767 variant.
How does the BOOST pin function in the LT1767EMS8E-1.8#PBF?
The BOOST pin supplies elevated gate drive voltage to the internal NPN switch, enabling saturation and minimizing conduction loss (0.22Ω typ.). It requires a 0.1µF ceramic capacitor and Schottky diode (e.g., CMDSH-3); connecting the diode anode to VOUT generates ~VOUT+VIN, while connection to VIN yields ~2×VIN - subject to BOOST pin absolute max rating of 35V.
Can the LT1767EMS8E-1.8#PBF be synchronized to an external clock?
Yes. The SYNC pin accepts logic-level signals from 1.5MHz to 2MHz with 20–80% duty cycle, allowing EMI reduction through frequency alignment in multi-rail systems. When unused, SYNC must be grounded to prevent noise coupling; floating the pin may cause erratic operation.
What thermal design guidance applies to the LT1767EMS8E-1.8#PBF's exposed pad?
The MS8E package's exposed pad is electrically connected to GND and must be soldered to ≥1 cm² of inner- or outer-layer copper with ≥4 thermal vias (0.3mm diameter) to internal ground planes. This achieves the specified θJA = 40°C/W and supports 1.2A continuous output at +85°C ambient without forced air.
LT1767EMS8E-1.8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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):
- 1.8V
- 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-EP
LT1767EMS8E-1.8#PBF FAQ
1.How can I place an order for LT1767EMS8E-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-1.8#PBF 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-1.8#PBF reliable?
The price and inventory of LT1767EMS8E-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8E-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-1.8#PBF?
LT1767EMS8E-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-1.8#PBF 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-1.8#PBF?
For technical support, including LT1767EMS8E-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-1.8#PBF requirements.
6.How does Aetrix verify that LT1767EMS8E-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-1.8#PBF 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-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-1.8#PBF?
All LT1767EMS8E-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-1.8#PBF, 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-1.8#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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