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Analog Devices Inc. LT1767EMS8E-2.5#PBF
- Part No.:
- LT1767EMS8E-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-2.5#PBF.pdf
- Description:
- IC REG BCK SEPIC 2.5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
LT1767EMS8E-2.5#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 2.5V output, 0.22Ω internal NPN switch, 2% output tolerance, and operation from 3V to 25V input. It delivers high efficiency in compact battery-powered systems and wall adapters.
For engineers reviewing the LT1767EMS8E-2.5#PBF datasheet, LT1767EMS8E-2.5#PBF pinout, LT1767EMS8E-2.5#PBF application, or LT1767EMS8E-2.5#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for production ramp-up.
Technical Context
The LT1767EMS8E-2.5#PBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and an internal 1.25MHz oscillator. Its bipolar NPN power switch is driven via the BOOST pin to achieve saturation, reducing conduction loss to ~330mV at 1.5A.
Feedback regulation uses a precision 1.2V reference; for the -2.5 variant, internal resistor divider sets VOUT = 2.5V ±2%, eliminating external components. Shutdown reduces quiescent current to 6µA, and SYNC allows external synchronization up to 2MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - eliminates need for external feedback resistors; ensures stable rail for low-voltage logic and analog circuitry. |
| Switch Current Limit | 1.5A minimum - supports continuous 1.2A+ output under thermal derating; enables compact inductor selection (e.g., 2.2–4.7µH). |
| Switching Frequency | 1.25MHz typical - permits use of small chip inductors and ceramic capacitors; reduces EMI filter size vs. lower-frequency buck converters. |
| Input Voltage Range | 3V to 25V - accommodates Li-ion (3.0–4.2V), 5V/12V/24V industrial rails, and unregulated wall adapters without pre-regulation. |
| Efficiency Enabling Feature | 0.22Ω on-resistance switch - achieves >85% efficiency at 1A load (12V→2.5V); minimizes thermal rise in exposed-pad MS8E package. |
| Shutdown Current | 6µA max - extends battery life in portable devices during sleep mode; enables low-power system-level wake-up sequencing. |
| Thermal Resistance | θJA = 40°C/W (MS8E) - requires PCB copper pour under exposed pad; enables 1.5A operation at +85°C ambient with minimal heatsinking. |
Pinout & Package
LT1767EMS8E-2.5#PBF uses an 8-lead plastic MSOP package with exposed thermal pad (MS8E), rated for –40°C to +125°C junction temperature. The exposed pad is electrically connected to GND and must be soldered to ≥1 cm² copper area for thermal 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 tied to VOUT or VIN; critical for <330mV switch drop. |
| 2: VIN | Main power input | Supplies internal bias regulator and collector of NPN switch; must be bypassed with low-ESR ceramic cap ≤5mm from pin to minimize dI/dt spikes. |
| 3: SW | Switch emitter node | Drives inductor; swings from ~0V to VIN during operation; requires Schottky catch diode (e.g., UPS120) clamped to GND. |
| 4: GND | Power and signal reference | Reference for FB, VC, SHDN; exposed pad connection point; must tie directly to PCB ground plane to ensure load regulation and thermal performance. |
| 5: SYNC | External clock sync input | Logic-compatible input (1.5–2MHz range); grounds when unused; enables EMI reduction via frequency dithering or system clock alignment. |
| 6: VC | Error amplifier output / current limit control | 0.35V–0.9V range reflects load demand; used for loop compensation or external current limiting; drives shutdown if pulled to GND. |
| 7: FB | Feedback sense input | Internally connected to 2.5V output; no external divider needed; monitors regulation accuracy; enables current foldback below 0.5V during fault. |
| 8: SHDN | Enable/disable control | 1.33V threshold; pulls high internally (3µA source); enables UVLO configuration with resistor divider; 6µA shutdown current achieved when <1.27V. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 1.5A NPN switch | Integrates power transistor and driver in MS8E package-eliminates external MOSFET, gate driver, and bootstrap circuitry. |
| Constant 1.25MHz switching | Enables consistent EMI profile and predictable filter design; avoids variable-frequency artifacts like Burst Mode noise. |
| Exposed thermal pad (MS8E) | Reduces θJA from 110°C/W (MS8) to 40°C/W-supports full 1.5A load at +85°C ambient with standard 2-layer PCB. |
| Current-mode control | Delivers fast transient response to load steps (<10µs recovery) and inherent cycle-by-cycle overcurrent protection without sensing resistors. |
| Fixed 2.5V output with 2% tolerance | Guarantees compliance with 2.5V I/O standards (e.g., DDR SDRAM, LVDS receivers) without calibration or trimming. |
Applications
| DSL Modem Power Supply | Portable Computer Core Logic Rail |
|---|---|
Use Scenario: Provides clean 2.5V rail for DSL PHY and controller ICs in space-constrained CPE units. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 2.5V at up to 1.2A with low ripple and fast load transient response. Use Value: Enables single-stage conversion from 12V adapter input-reducing BOM count by eliminating intermediate 5V stage and associated losses. |
Use Scenario: Powers 2.5V I/O interfaces and low-voltage microcontrollers in clamshell notebooks and tablets. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating from Li-ion battery (3.0–4.2V) or 5V USB-PD input. Use Value: 6µA shutdown current extends standby time; 1.25MHz operation allows ultra-low-profile 2.2µH inductor and 4.7µF ceramic output cap. |
| Industrial Wall Adapter Module | Battery-Powered Test Equipment |
Use Scenario: Generates isolated 2.5V auxiliary rail in universal-input (85–264V AC) wall adapters for smart home hubs. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller accepting 12V DC bus from primary flyback stage. Use Value: Fixed 2.5V output simplifies certification; MS8E thermal performance sustains 1.5A load without heatsink in sealed enclosure. |
Use Scenario: Supplies 2.5V to precision ADCs, op-amps, and wireless SoCs in handheld multimeters and sensor calibrators. IC Role / Device Role / Timing Role: Low-noise, high-PSRR DC/DC converter with tight output tolerance for analog signal chain integrity. Use Value: 2% output tolerance ensures measurement accuracy; current-mode control rejects line/load disturbances affecting reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-2.5#PBF | 2.25MHz switching, 1.2A max, integrated MOSFETs, 2.5V fixed, 20V max input | Higher frequency enables smaller magnetics but lower current rating; requires different compensation network | Select for ultra-compact designs where 1.2A suffices and 20V input ceiling is acceptable. |
| TPS54227DDAR | 2.2MHz, 2A, 17V max input, adjustable output (requires external resistors), no BOOST pin | Higher current and wider input range, but lacks fixed 2.5V option and BOOST-assisted saturation | Select when adjustable output or >1.5A capability is required; avoid if 2.5V precision and minimal BOM are priorities. |
Compared with LT1767EMS8E-2.5#PBF, LTC3605EDE-2.5#PBF offers higher frequency but lower current, while TPS54227DDAR provides greater current headroom and input range but sacrifices fixed-output simplicity and BOOST-enhanced efficiency at low duty cycles.
Availability
LT1767EMS8E-2.5#PBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT1767EMS8E-2.5#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, datasheets, and application engineering for legacy Linear parts including the LT1767 family.
The LT1767 series was designed as a high-frequency, thermally robust monolithic buck regulator targeting space-constrained, high-efficiency applications in portable, industrial, and communications equipment.
FAQ
What is the maximum continuous output current of the LT1767EMS8E-2.5#PBF?
The LT1767EMS8E-2.5#PBF guarantees a minimum switch current limit of 1.5A across its full operating temperature range. Maximum continuous output current depends on thermal conditions: with proper PCB copper pour on the exposed pad, it delivers ≥1.2A at +85°C ambient. At +25°C with adequate heatsinking, full 1.5A is sustainable. Derating curves in the datasheet define exact limits per ambient temperature and airflow.
Does the LT1767EMS8E-2.5#PBF require external feedback resistors?
No. The LT1767EMS8E-2.5#PBF integrates the resistor divider for 2.5V output; the FB pin is internally connected to the output. This eliminates external components, reduces layout sensitivity, and ensures factory-trimmed 2% output tolerance. External resistors are only needed for the adjustable LT1767 version.
Can the LT1767EMS8E-2.5#PBF operate from a 3.3V input?
Yes. The LT1767EMS8E-2.5#PBF supports input voltages from 3V to 25V. At 3.3V input, the minimum duty cycle (~76%) remains within safe operating limits, and the BOOST pin must be tied to VOUT (2.5V) to maintain sufficient gate drive for the internal NPN switch. Efficiency remains >80% at 500mA load.
What is the purpose of the BOOST pin on the LT1767EMS8E-2.5#PBF?
The BOOST pin supplies elevated voltage to the internal NPN switch driver, enabling saturation and minimizing on-state voltage drop to ~330mV. It requires a 0.1µF ceramic capacitor and Schottky diode (e.g., CMDSH-3) connected between BOOST and either VOUT or VIN. Without BOOST, switch loss increases significantly, degrading efficiency and thermal performance.
Is the LT1767EMS8E-2.5#PBF RoHS compliant and lead-free?
Yes. The "#PBF" suffix in LT1767EMS8E-2.5#PBF denotes lead-free finish and RoHS compliance. The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) and is qualified for reflow soldering per IPC/JEDEC J-STD-020. Full compliance documentation is available from Analog Devices' product page.
LT1767EMS8E-2.5#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):
- 2.5V
- 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-2.5#PBF FAQ
1.How can I place an order for LT1767EMS8E-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-2.5#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-2.5#PBF reliable?
The price and inventory of LT1767EMS8E-2.5#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-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-2.5#PBF?
LT1767EMS8E-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-2.5#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-2.5#PBF?
For technical support, including LT1767EMS8E-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-2.5#PBF requirements.
6.How does Aetrix verify that LT1767EMS8E-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-2.5#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-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-2.5#PBF?
All LT1767EMS8E-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-2.5#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-2.5#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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