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Analog Devices Inc. LT1767EMS8-1.8#PBF
- Part No.:
- LT1767EMS8-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8-1.8#PBF.pdf
- Description:
- IC REG BCK SEPIC 1.8V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1767EMS8-1.8#PBF 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 1.8V output, 0.22Ω internal NPN switch, and 2% output voltage tolerance. It operates from 3V to 25V input and delivers stable power to low-voltage microcontrollers and FPGAs in portable computing and battery-powered systems.
For engineers reviewing the LT1767EMS8-1.8#PBF datasheet, LT1767EMS8-1.8#PBF pinout, LT1767EMS8-1.8#PBF application, or LT1767EMS8-1.8#PBF equivalent, key selection factors include its constant-frequency current-mode control, exposed-pad thermal performance (θJA = 40°C/W in MS8E variant), synchronization capability up to 2MHz, and integrated 1.2V feedback reference enabling precise 1.8V regulation without external resistors.
Technical Context
The LT1767EMS8-1.8#PBF implements a current-mode buck topology with cycle-by-cycle peak current limiting and a dedicated error amplifier output (VC pin) that directly sets switch current trip level. Its BOOST pin drives the internal bipolar NPN switch with >2.7V headroom above SW, enabling saturation and minimizing conduction loss despite high switching frequency.
Internal circuitry includes a 1.25MHz oscillator with ±15% variation over temperature, undervoltage lockout at 2.6V (typ), and shutdown logic with 1.33V threshold and 7µA hysteresis current. The FB pin is internally connected to VOUT, eliminating external divider components for the fixed 1.8V version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - eliminates need for external feedback resistors and reduces BOM count. |
| Switch Current Limit | 1.5A minimum - enables continuous 1.2A+ output under thermal derating at 125°C junction. |
| Switching Frequency | 1.25MHz typical - allows use of compact 2.2–4.7µH chip inductors and ceramic input/output capacitors. |
| Input Voltage Range | 3V to 25V - supports wide-range inputs including 12V wall adapters and multi-cell Li-ion batteries. |
| Feedback Reference | 1.2V internal - ensures accurate 1.8V regulation via on-die resistor network; no external divider required. |
| Shutdown Current | 6µA typical - extends battery life in standby mode for portable electronics. |
| Thermal Resistance | θJA = 40°C/W (MS8E package) - requires minimal PCB copper area for full 1.5A operation at 125°C ambient. |
Pinout & Package
LT1767EMS8-1.8#PBF uses an 8-lead plastic MSOP package with exposed pad (MS8E), where the exposed pad is electrically and thermally connected to GND. This configuration achieves θJA = 40°C/W when soldered to ≥1 cm² of 2-oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides >2.7V overhead to saturate internal NPN switch; must be tied to VOUT or VIN via Schottky diode and 0.1µF capacitor. |
| VIN | Power input and switch collector | Supplies internal bias regulator and powers switch collector; requires local 10µF ceramic bypass near pin. |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time - mandates external catch diode (e.g., UPS120) clamped to GND. |
| GND | Power and signal reference | Must connect directly to large copper plane; serves as return path for switch current and feedback reference. |
| SYNC | External clock synchronization input | Logic-compatible input accepting 1.5–2MHz square wave; float or ground when unused. |
| VC | Error amplifier output / current limit control | 0.35V–0.9V range sets peak switch current; used for loop compensation or external current limiting. |
| FB | Feedback sense input | Internally tied to VOUT; no external connection needed for fixed 1.8V operation. |
| SHDN | Enable/disable control | 1.33V threshold turns device on; <1.27V forces shutdown with 6µA quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Enables predictable EMI profile and fast transient response (<10µs) to load steps without external compensation. |
| Integrated 0.22Ω NPN switch | Delivers >85% efficiency at 1A (12V→1.8V) while avoiding MOSFET gate-drive complexity and cost. |
| Exposed-pad MS8E thermal package | Reduces thermal resistance by 64% vs standard MS8 (110°C/W), enabling 1.5A operation without heatsink. |
| Synchronization to 2MHz | Allows noise-sensitive systems to shift switching harmonics away from critical bands (e.g., AM radio, audio ADCs). |
| Current-limit foldback below 0.5V FB | Reduces short-circuit stress during startup or fault conditions, improving reliability in unregulated input scenarios. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 1.8V I/O banks and core logic in ultrabooks and tablets with single-cell or dual-cell Li-ion inputs. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 1.8V from 3.0–4.2V battery rail with dynamic load transient support. Use Value: Enables >90% efficiency at light loads (10mA) and maintains regulation down to 3V input, extending runtime per charge cycle. |
Use Scenario: Supplying 1.8V to low-power sensors and BLE SoCs in wireless IoT nodes powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in discontinuous conduction mode at µA-level quiescent loads. Use Value: 6µA shutdown current and 1mA operating supply current minimize battery drain during sleep states. |
| DSL Modems | Distributed Power |
Use Scenario: Generating 1.8V for Ethernet PHYs and DSPs in residential DSL gateways powered from 12V wall adapters. IC Role / Device Role / Timing Role: Secondary regulator deriving clean 1.8V from intermediate 3.3V or 5V rails in multi-rail power architectures. Use Value: 1.25MHz switching allows small 2.2µH inductors and avoids audible noise in consumer enclosures. |
Use Scenario: Local point-of-load conversion in industrial PLC modules requiring isolated 1.8V for FPGA configuration memory. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator mounted directly on FPGA carrier board near power pins. Use Value: Exposed-pad MS8E package dissipates 1.5W with ≤40°C/W rise, eliminating need for airflow or thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMS8E-1.8#PBF | Higher 3MHz switching frequency, lower 0.15Ω RDS(on), but only 1.2A max output current. | Better suited for ultra-compact designs needing <1µH inductors; less margin for 1.5A continuous loads. | Select LTC3605EMS8E-1.8#PBF when board space is constrained and peak load ≤1.2A; retain LT1767EMS8-1.8#PBF for higher current or legacy thermal layout compatibility. |
| TPS62130ARGTR | 1.2V fixed reference, 3A switch, 2.5–6V input range - lacks 25V input capability and exposed-pad thermal option. | Optimized for single-cell Li-ion (3.0–4.2V) systems; unsuitable for 12V/24V industrial inputs. | Choose TPS62130ARGTR for cost-sensitive, low-input-voltage applications; use LT1767EMS8-1.8#PBF when wide input range (3–25V) or MS8E thermal performance is required. |
Compared with LTC3605EMS8E-1.8#PBF and TPS62130ARGTR, the LT1767EMS8-1.8#PBF uniquely balances 25V input tolerance, 1.5A current capability, and MS8E thermal performance - making it optimal for industrial and adapter-powered 1.8V loads where reliability across voltage extremes matters most.
Availability
LT1767EMS8-1.8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, DSL modems, and distributed power applications requiring stable component supply with long-term industrial lifecycle support.
Supply support for LT1767EMS8-1.8#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 all Linear power products, including rigorous AEC-Q200-aligned reliability testing for industrial-grade parts.
The LT1767 series was designed specifically for high-efficiency, wide-input-range step-down conversion in space-constrained and thermally demanding environments - targeting portable, telecom, and industrial power systems where fixed-output simplicity and thermal robustness are critical.
FAQ
What is the maximum continuous output current of the LT1767EMS8-1.8#PBF?
The LT1767EMS8-1.8#PBF guarantees a minimum 1.5A switch current limit across –40°C to 125°C junction temperature. Continuous output current depends on thermal design: with the MS8E package mounted on ≥1 cm² of 2-oz copper, it delivers 1.2A continuously at 125°C ambient. Derating applies above 85°C ambient per the thermal curves in the datasheet.
Does the LT1767EMS8-1.8#PBF require external feedback resistors?
No. The LT1767EMS8-1.8#PBF integrates the resistor divider for 1.8V output; the FB pin is internally connected to VOUT. External resistors are unnecessary and must not be added - doing so would disrupt regulation accuracy and potentially cause instability.
Can the LT1767EMS8-1.8#PBF synchronize to an external clock?
Yes. The SYNC pin accepts logic-level signals from 1.5MHz to 2MHz with 20–80% duty cycle. When driven, the internal oscillator locks to the external frequency, enabling EMI reduction and timing coordination in multi-regulator systems. Leave SYNC grounded if unused.
What is the purpose of the BOOST pin on the LT1767EMS8-1.8#PBF?
The BOOST pin supplies elevated drive voltage (>2.7V above VSW) to the base of the internal NPN switch, ensuring saturation and minimizing conduction loss (typical 330mV drop at 1.5A). It requires an external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3) tied to VOUT or VIN.
Is the LT1767EMS8-1.8#PBF RoHS-compliant and lead-free?
Yes. The "#PBF" suffix denotes lead-free finish per JEDEC J-STD-609. The LT1767EMS8-1.8#PBF meets RoHS Directive 2011/65/EU and is compatible with standard Pb-free reflow profiles (peak 260°C). Marking code "LTWG" appears on the top surface of the MS8E package.
LT1767EMS8-1.8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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
LT1767EMS8-1.8#PBF FAQ
1.How can I place an order for LT1767EMS8-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8-1.8#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 LT1767EMS8-1.8#PBF reliable?
The price and inventory of LT1767EMS8-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8-1.8#PBF?
LT1767EMS8-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8-1.8#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 LT1767EMS8-1.8#PBF?
For technical support, including LT1767EMS8-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8-1.8#PBF requirements.
6.How does Aetrix verify that LT1767EMS8-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8-1.8#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 LT1767EMS8-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8-1.8#PBF?
All LT1767EMS8-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8-1.8#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 LT1767EMS8-1.8#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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