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Analog Devices Inc. LT1767EMS8-1.8#TRPBF
- Part No.:
- LT1767EMS8-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8-1.8#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 1.8V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1767EMS8-1.8#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 1.8V output, 0.22Ω internal NPN switch, 2% output tolerance, and 6µA shutdown current. It delivers regulated power for low-voltage microcontroller cores and FPGA I/O rails in space-constrained industrial and portable systems.
For engineers reviewing the LT1767EMS8-1.8#TRPBF datasheet, LT1767EMS8-1.8#TRPBF pinout, LT1767EMS8-1.8#TRPBF application, or LT1767EMS8-1.8#TRPBF equivalent, key selection criteria include its constant-frequency current-mode control architecture, thermal performance in the MS8 package (θJA = 110°C/W), fixed 1.8V feedback reference, and synchronization capability up to 2MHz.
Technical Context
The LT1767EMS8-1.8#TRPBF implements a current-mode buck topology with cycle-by-cycle peak current limiting and a dedicated error amplifier output (VC pin) for loop compensation or current clamping. Its internal 1.25MHz oscillator enables compact external components, while the BOOST pin drives the on-chip NPN switch into saturation using an external capacitor-diode network.
It features dual undervoltage protection: built-in VIN lockout at 2.6V and programmable SHDN threshold at 1.33V with 7µA hysteresis current. The FB pin is internally connected to the 1.8V output, eliminating external resistors, and the GND pin is thermally tied to the MS8 lead frame for enhanced heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over temperature and line - eliminates feedback resistor network and reduces BOM count. |
| Switch Current Limit | 1.5A minimum at 0°C–125°C - supports continuous 1.2A output under thermal derating in MS8 package. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz range) - enables use of sub-5µH chip inductors and <5µF ceramic input/output capacitors. |
| Internal Switch RCE(sat) | 0.22Ω typical - yields <400mV conduction loss at 1.5A, critical for efficiency in 3V–25V input range. |
| Shutdown Current | 6µA typical at VIN = 25V - extends battery life in always-on portable systems during sleep mode. |
| Feedback Reference | 1.764V–1.836V (1.8V ±2%) - tightly regulated internal divider ensures stable output without external trimming. |
| Operating Input Range | 3V to 25V - supports wide-range inputs including 12V industrial rails and multi-cell Li-ion batteries. |
Pinout & Package
LT1767EMS8-1.8#TRPBF uses an 8-lead plastic MSOP (MS8) package with exposed lead frame for thermal enhancement (θJA = 110°C/W). Ground pin (Pin 4) is directly bonded to the internal tab and must be soldered to a large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Boost voltage supply for NPN switch driver | Accepts external capacitor-diode network to generate ~VOUT+VIN drive voltage; enables low VCE(sat) operation. |
| VIN (Pin 2) | Input power and internal bias supply | Connects to collector of internal NPN switch; requires local 10µF ceramic bypass due to high dI/dt switching noise. |
| SW (Pin 3) | Emitter of internal NPN power switch | Drives external inductor; swings negative during off-time - mandates external Schottky catch diode (e.g., UPS120). |
| GND (Pin 4) | Power and signal reference ground | Thermally coupled to MS8 lead frame; must connect to PCB ground plane to maintain thermal resistance and load regulation. |
| SYNC (Pin 5) | External clock synchronization input | Logic-compatible (20–80% duty); extends frequency range to 2MHz - reduces EMI and allows phase alignment in multi-rail systems. |
| VC (Pin 6) | Error amplifier output / current limit control | Provides 0.35V–0.9V analog signal proportional to load; usable for loop compensation or external current limiting override. |
| FB (Pin 7) | Feedback input (internally tied to VOUT) | Fixed 1.8V version connects internal resistor divider to output - no external components required for regulation. |
| SHDN (Pin 8) | Enable/disable control with UVLO function | 1.33V threshold with 7µA hysteresis - enables precise input undervoltage lockout or system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 1.25MHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing across input voltage and load conditions. |
| Current-mode control with cycle-by-cycle limiting | Delivers fast transient response to load steps and inherent stability without complex compensation networks. |
| High-efficiency 0.22Ω NPN switch | Reduces conduction losses at high currents - achieves >85% efficiency at 1A output from 12V input. |
| Synchronizable oscillator (up to 2MHz) | Allows EMI reduction via frequency spreading or coordination with other switching regulators in multi-rail designs. |
| Exposed-pad MS8 thermal design | Supports 1.2A continuous output in ambient temperatures up to 85°C with minimal copper area (≥1 cm²). |
Applications
| Microcontroller Core Supply | FPGA I/O Bank Regulation |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4 core requiring stable 1.8V at up to 1.2A with tight ripple (<20mVpp) in a handheld medical device. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 1.8V rail; operates at 1.25MHz to minimize inductor size and avoid audible noise. Use Value: Fixed 1.8V output eliminates resistor matching errors; 6µA shutdown current extends battery runtime during deep-sleep modes. |
Use Scenario: Generating clean 1.8V for Spartan-7 FPGA I/O banks in an industrial PLC with 12V backplane input. IC Role / Device Role / Timing Role: Point-of-load regulator with SYNC pin locked to system clock domain to suppress beat frequencies in mixed-signal sections. Use Value: Constant-frequency current-mode control maintains regulation during rapid I/O toggle transients; BOOST pin ensures low dropout under high-current slew. |
| DSL Modem Power Stage | Portable Computer Subsystem Rail |
|
Use Scenario: Converting 12V wall adapter output to 1.8V for ADSL line driver ICs operating in temperature-cycled environments. IC Role / Device Role / Timing Role: High-reliability buck regulator with thermal shutdown and full-cycle current limiting to survive short-circuit faults on line interface. Use Value: 25V absolute max input rating accommodates 12V surge transients; MS8 package withstands reflow and vibration per Telcordia GR-1209. |
Use Scenario: Supplying 1.8V to Wi-Fi/BT combo module in ultrabook design where board space is constrained to <5mm² per rail. IC Role / Device Role / Timing Role: Compact, integrated switching solution replacing discrete controller + MOSFET + driver combinations. Use Value: 8-pin MSOP footprint saves >40% PCB area vs. SO-8 alternatives; 1.25MHz operation permits 2.2µH inductor (3.2×3.0mm) and 4.7µF ceramic output cap. |
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#TRPBF | 42V max input, 2A switch, 500kHz frequency, integrated power MOSFETs - higher voltage rating but lower switching frequency. | Better suited for automotive 24V systems; less optimal for space-constrained 12V designs needing small inductors. | Select when input exceeds 25V or higher output current (>1.5A) is required; not drop-in due to different pinout and compensation requirements. |
| TPS54318RTER | 18V max input, 3A switch, 700kHz frequency, integrated FETs, adjustable output - wider input range than LT1767 but no fixed 1.8V variant. | Requires external feedback resistors; lacks BOOST pin architecture - lower efficiency at high input-to-output ratios. | Choose for cost-sensitive volume production with adjustable output needs; verify thermal performance in MSOP-8 since θJA = 130°C/W is higher than LT1767's 110°C/W. |
Compared with LT3652EMSE-1.8#TRPBF and TPS54318RTER, the LT1767EMS8-1.8#TRPBF offers superior high-frequency efficiency in 3V–25V inputs due to its BOOST-driven NPN switch and fixed 1.8V configuration, making it optimal for compact, thermally constrained 1.2A applications where BOM simplicity and EMI predictability are critical.
Availability
LT1767EMS8-1.8#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 RoHS-compliant packaging.
Supply support for LT1767EMS8-1.8#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 legacy of high-performance analog and power management ICs with rigorous reliability testing and military-grade qualification processes.
The LT1767 family was designed specifically for high-efficiency, high-frequency point-of-load conversion in space-limited industrial and portable equipment, emphasizing thermal robustness, fixed-output simplicity, and synchronization flexibility.
FAQ
What is the maximum continuous output current of the LT1767EMS8-1.8#TRPBF under typical conditions?
The LT1767EMS8-1.8#TRPBF delivers up to 1.2A continuously in the MS8 package at 25°C ambient with adequate PCB copper area (≥1 cm² thermal pad). At 85°C ambient, derating reduces this to ~0.9A due to θJA = 110°C/W and 125°C junction limit. The 1.5A switch current rating assumes ideal thermal conditions and is not sustainable at full duty cycle without thermal throttling.
Does the LT1767EMS8-1.8#TRPBF require external feedback resistors to set the 1.8V output?
No. The LT1767EMS8-1.8#TRPBF integrates the precision resistor divider internally, connecting the FB pin directly to the output. This eliminates external components, reduces layout sensitivity, and ensures 1.8V ±2% accuracy across temperature and line without calibration - a key advantage over adjustable variants like the LT1767.
Can the LT1767EMS8-1.8#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes. The LT1767EMS8-1.8#TRPBF accepts logic-level signals (20–80% duty) on the SYNC pin to lock its internal oscillator from 1.25MHz up to 2MHz. This enables EMI reduction through frequency dithering or phase alignment in multi-regulator systems - critical for noise-sensitive analog subsystems.
What type of catch diode is recommended for use with the LT1767EMS8-1.8#TRPBF?
The datasheet specifies the UPS120 Schottky diode (or MBRM120LTI) - rated for 2A average forward current and 20V reverse voltage, with ~0.5V VF at 1A. Its low forward voltage minimizes conduction loss during SW pin off-time, and its fast recovery prevents reverse recovery spikes that could destabilize the current-mode loop.
How does the BOOST pin function in the LT1767EMS8-1.8#TRPBF, and what components are needed?
The BOOST pin supplies elevated gate drive to the internal NPN switch, enabling saturation and reducing VCE(sat) to ~0.22Ω. It requires an external 0.1µF ceramic capacitor and Schottky diode (e.g., CMDSH-3), with the diode anode typically tied to VOUT. This generates ~VIN+VOUT voltage, ensuring sufficient headroom (>2.7V) for full switch drive across the input range.
LT1767EMS8-1.8#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):
- 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#TRPBF FAQ
1.How can I place an order for LT1767EMS8-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8-1.8#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 LT1767EMS8-1.8#TRPBF reliable?
The price and inventory of LT1767EMS8-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8-1.8#TRPBF?
LT1767EMS8-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8-1.8#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 LT1767EMS8-1.8#TRPBF?
For technical support, including LT1767EMS8-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8-1.8#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8-1.8#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 LT1767EMS8-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8-1.8#TRPBF?
All LT1767EMS8-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8-1.8#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 LT1767EMS8-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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