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Analog Devices Inc. LT1767EMS8E-3.3#PBF
- Part No.:
- LT1767EMS8E-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-3.3#PBF.pdf
- Description:
- IC REG BCK SEPIC 3.3V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:768
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Product details
Overview
LT1767EMS8E-3.3#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 3.3V output, 0.22Ω internal NPN switch, 2% output tolerance, and operation from 3V to 25V input. It delivers up to 1.2A at 3.3V in compact wall adapters and battery-powered systems.
For engineers reviewing the LT1767EMS8E-3.3#PBF datasheet, LT1767EMS8E-3.3#PBF pinout, LT1767EMS8E-3.3#PBF application, or LT1767EMS8E-3.3#PBF equivalent, this page provides verified technical context, thermal-aware package details, current-mode control behavior, fixed-output design constraints, and validated alternative options for industrial and portable power supply designs.
Technical Context
The LT1767EMS8E-3.3#PBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and internal 1.25MHz oscillator synchronized up to 2MHz. Its bipolar NPN switch architecture relies on external BOOST capacitor/diode to achieve 0.22Ω effective on-resistance and low VCE(sat).
It integrates a 1.2V feedback reference with internal resistor divider for 3.3V output (3.234V–3.366V), supports shutdown with 6µA quiescent current, and maintains constant 1.5A maximum switch current across all duty cycles - independent of input voltage or synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V); no external feedback resistors required. |
| Switch Current Limit | 1.5A typical at 0°C–125°C; remains constant across all duty cycles and input voltages. |
| Switching Frequency | 1.25MHz nominal; synchronizable to external clock up to 2MHz for EMI reduction. |
| Input Voltage Range | 3V to 25V; includes 2.73V undervoltage lockout threshold to prevent erratic startup. |
| Efficiency Enabling Feature | 0.22Ω on-chip NPN switch with BOOST pin drive enables high efficiency at high frequency without external MOSFET. |
| Thermal Resistance | θJA = 40°C/W (MS8E exposed pad); requires PCB copper area connection to GND for rated performance. |
| Shutdown Current | 6µA max at VIN = 25V; enables ultra-low-power standby in battery systems. |
Pinout & Package
LT1767EMS8E-3.3#PBF uses an 8-lead plastic MSOP package with exposed thermal pad (MS8E), where the pad is internally connected to GND and must be soldered to ≥1 cm² 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 external 0.1µF capacitor and Schottky diode tied to VOUT or VIN. |
| 2: VIN | Input power and switch collector | Supplies internal circuitry and powers NPN collector; must be bypassed locally with ceramic capacitor to minimize dI/dt spikes. |
| 3: SW | Switch emitter output | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode clamping negative excursion. |
| 4: GND | Power and signal reference | Reference for FB, VC, and SHDN; exposed pad is electrically GND; must connect to large copper plane for thermal and ground integrity. |
| 5: SYNC | Oscillator synchronization input | Logic-compatible input (20–80% duty cycle); accepts up to 2MHz external clock to align switching frequency and reduce beat frequencies. |
| 6: VC | Error amplifier output / current limit control | 0.35V–0.9V range reflects load demand; used for compensation and optional current clamp; can be driven to GND to disable output. |
| 7: FB | Feedback input (internally tied to VOUT) | Internally connected to 3.3V output via precision divider; no external resistors needed; monitors regulation accuracy and enables foldback during fault. |
| 8: SHDN | Enable/disable control | 1.33V threshold; pull low to shut down; 7µA hysteresis enables precise UVLO implementation with external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency integrated switch | 0.22Ω NPN switch enables >90% efficiency at 1.2A (12V→3.3V), eliminating need for external MOSFET and gate driver. |
| Constant-current limit across duty cycle | 1.5A switch current rating holds at all input voltages and synchronization frequencies - critical for consistent short-circuit protection. |
| Exposed-pad thermal management | MS8E package achieves θJA = 40°C/W (vs. 110°C/W for standard MS8), enabling 1.2A continuous output without derating in compact layouts. |
| Current-mode control architecture | Enables fast transient response (<10µs to settle after 1A load step) and stable loop compensation with single-pole RC network on VC pin. |
| Low-quiescent-current shutdown | 6µA shutdown current extends battery life in portable systems; SHDN pin doubles as accurate 1.33V UVLO comparator input. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Compact AC/DC adapter-derived 12V rail powering PHY, DSP, and memory subsystems in space-constrained DSL modems. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering up to 1.2A with minimal external components and no heatsink. Use Value: Enables full 3.3V system operation from wide-input 12V supply while maintaining <10°C junction rise under full load due to MS8E thermal pad. |
Use Scenario: Main logic rail conversion in subnotebook or tablet designs using Li-ion (8.4–12.6V) or wall adapter (12–19V) inputs. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying CPU I/O, USB PHY, and display interface circuits. Use Value: Delivers regulated 3.3V at 1.2A with 6µA shutdown current, extending battery runtime during sleep modes without requiring PMIC sequencing. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary-side regulation in universal-input offline adapters targeting 3.3V/1A consumer electronics outputs. IC Role / Device Role / Timing Role: Post-regulator stepping down 5–12V intermediate bus to clean 3.3V for microcontrollers and sensors. Use Value: Reduces BOM count by integrating switch, controller, and feedback - eliminating discrete MOSFET, driver, and resistor network. |
Use Scenario: Power management in handheld test equipment or medical monitors operating from 2-cell Li-ion (6–8.4V) or 3-cell NiMH (3.6–4.5V). IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dynamic load profiles with burst-mode-like light-load behavior. Use Value: Maintains >85% efficiency down to 10mA load via low 1mA operating supply current and 6µA shutdown state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMS8E-3.3#PBF | Higher 3MHz switching frequency; 1.2A max output; requires external compensation; lower IQ (25µA active, 1µA shutdown). | Better suited for ultra-thin designs needing smaller inductors; less tolerant of high-voltage transients (>20V). | Select when board space is constrained and input voltage stays ≤16V; verify BOOST and SW layout for 3MHz edge rates. |
| TPS54331DR | 3.5A switch; adjustable output (0.8V–28V); requires external feedback resistors; 4.5V–28V input; 125°C max junction. | Offers flexibility for multi-rail systems but increases BOM and layout complexity; lacks integrated 3.3V divider. | Choose when future voltage variants or higher current headroom (>1.2A) is required; not drop-in for fixed 3.3V use. |
Compared with LT1767EMS8E-3.3#PBF, LTC3605EMS8E-3.3#PBF trades thermal robustness (θJA = 40°C/W) for higher frequency miniaturization, while TPS54331DR sacrifices simplicity and fixed-output accuracy for programmability and current headroom - making LT1767EMS8E-3.3#PBF optimal for cost-sensitive, thermally constrained 3.3V-only applications.
Availability
LT1767EMS8E-3.3#PBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and wall adapters requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT1767EMS8E-3.3#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 product support, datasheet archives, and application engineering for legacy Linear regulators including the LT1767 family.
The LT1767 series was designed specifically for high-density, high-efficiency non-isolated DC/DC conversion in portable and distributed power systems where thermal management, small footprint, and fixed-output simplicity are critical.
FAQ
What is the maximum continuous output current of the LT1767EMS8E-3.3#PBF?
The LT1767EMS8E-3.3#PBF delivers up to 1.2A continuously at 3.3V output under typical thermal conditions (θJA = 40°C/W with proper PCB copper). This is limited by thermal derating - not switch current - and drops to ~0.9A at 85°C ambient with minimal copper area. The internal 1.5A switch current limit remains fixed regardless of duty cycle or input voltage.
Can the LT1767EMS8E-3.3#PBF operate from a 2.8V input?
No. The LT1767EMS8E-3.3#PBF has a minimum operating input voltage of 2.73V (undervoltage lockout threshold), but reliable regulation at 3.3V output requires ≥3V input per datasheet specifications. At 2.8V input, the device may start but cannot sustain 3.3V output under load due to insufficient headroom for switch saturation and BOOST drive.
Is an external catch diode required for the LT1767EMS8E-3.3#PBF?
Yes. The LT1767EMS8E-3.3#PBF uses an NPN bipolar switch and does not integrate a synchronous rectifier or body diode. A Schottky catch diode (e.g., UPS120 or MBRM120LTI) must be placed between SW and GND to conduct inductor current during switch-off time and clamp negative voltage excursions below –0.8V.
How does the BOOST pin function in the LT1767EMS8E-3.3#PBF?
The BOOST pin supplies elevated gate drive to the internal NPN switch, enabling saturation and minimizing VCE(sat). It requires an external 0.1µF capacitor and Schottky diode - typically tied to VOUT for ≥3.3V outputs. For inputs <3.3V, tie BOOST to VIN with caution to avoid exceeding the 35V absolute maximum rating.
Does the LT1767EMS8E-3.3#PBF require external compensation components?
Yes. The VC pin is the error amplifier output and requires an external RC compensation network (typically 10kΩ + 1nF) between VC and GND to stabilize the current-mode loop. This network sets dominant pole frequency and ensures phase margin >45° across line/load/temperature variations.
LT1767EMS8E-3.3#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):
- 3.3V
- 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-3.3#PBF FAQ
1.How can I place an order for LT1767EMS8E-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-3.3#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-3.3#PBF reliable?
The price and inventory of LT1767EMS8E-3.3#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-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-3.3#PBF?
LT1767EMS8E-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-3.3#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-3.3#PBF?
For technical support, including LT1767EMS8E-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-3.3#PBF requirements.
6.How does Aetrix verify that LT1767EMS8E-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-3.3#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-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-3.3#PBF?
All LT1767EMS8E-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-3.3#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-3.3#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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