My Inquiry
My Account
Analog Devices Inc. LT1767EMS8-2.5#PBF
- Part No.:
- LT1767EMS8-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8-2.5#PBF.pdf
- Description:
- IC REG BCK SEPIC 2.5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1767EMS8-2.5#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 2.5V output, 0.22Ω internal NPN switch, 2% output tolerance, and 6µA shutdown current. It operates from 3V to 25V input and delivers stable power for portable computing and battery-powered systems.
For engineers reviewing the LT1767EMS8-2.5#PBF datasheet, LT1767EMS8-2.5#PBF pinout, LT1767EMS8-2.5#PBF application, or LT1767EMS8-2.5#PBF equivalent, key selection considerations 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 with internal resistor divider for 2.5V output.
Technical Context
The LT1767EMS8-2.5#PBF implements a fixed-frequency (1.25MHz nominal), current-mode buck topology using an on-die bipolar NPN power switch with BOOST-assisted saturation drive. Its error amplifier output (VC pin) directly sets cycle-by-cycle peak switch current, enabling fast transient response and stable loop compensation without external slope compensation.
It features dual-level undervoltage lockout: internal VIN lockout at 2.6V (min) and programmable SHDN threshold at 1.33V (typ), plus SYNC pin compatibility with 20–80% duty-cycle external clocks up to 2MHz. The FB pin is internally connected to the 2.5V output via a precision resistor network yielding ±2% total output tolerance over temperature and line/load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% over temperature, line, and load - eliminates external feedback resistors and ensures production-ready accuracy. |
| Switch Current Limit | 1.5A minimum (0°C to 125°C) - enables continuous 1.2A+ output under thermal derating, independent of duty cycle. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz over temp) - allows use of compact 2.2–4.7µH chip inductors and reduces input/output filtering size. |
| Input Voltage Range | 3V to 25V - supports wide-range DC inputs including 12V industrial rails and multi-cell Li-ion batteries. |
| Shutdown Current | 6µA typical - extends battery life in standby mode without requiring external disconnect circuitry. |
| Thermal Resistance θJA | 110°C/W (MS8), 40°C/W (MS8E) - exposed-pad variant enables >1.2A continuous operation at +85°C ambient with minimal copper area. |
| Feedback Reference | 1.2V internal reference with <±0.5µA bias - ensures high-accuracy regulation without external divider errors or leakage sensitivity. |
Pinout & Package
LT1767EMS8-2.5#PBF uses an 8-lead plastic MSOP package (MS8) with GND-connected tab for thermal conduction. The exposed-pad variant (MS8E) offers lower θJA but shares identical pinout and footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 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. |
| VIN | Power input and switch collector | Supplies internal regulator and powers NPN collector; must be bypassed locally with low-ESR ceramic capacitor. |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time - requires external catch diode (e.g., UPS120) clamped to GND. |
| GND | Analog/digital ground reference | Reference for FB, VC, and SHDN; must connect directly to large copper plane to minimize ground bounce and improve thermal dissipation. |
| SYNC | External clock synchronization input | Logic-compatible input accepting 1.5–2MHz external signal; floats or grounds to disable sync function. |
| VC | Error amplifier output / current limit control | 0.35V–0.9V range sets peak switch current; usable for loop compensation, current limiting, or forced shutdown. |
| FB | Feedback input | Internally tied to 2.5V output via precision divider - no external components required for fixed-output operation. |
| SHDN | Enable/disable control | 1.33V threshold enables UVLO functionality; pull high (>1.4V) for operation, ground or <1.27V for 6µA shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 1.25MHz switching frequency | Enables predictable EMI profile and consistent filter design across input voltage and load conditions. |
| Current-mode control with cycle-by-cycle limiting | Eliminates need for external slope compensation and guarantees stable operation at all duty cycles, including >50%. |
| Integrated 2.5V feedback network | Removes external resistor tolerance and layout parasitics, delivering ±2% output accuracy without calibration. |
| BOOST-assisted NPN switch (0.22Ω RCE(sat)) | Achieves high efficiency (>85% at 1A, 12V→2.5V) by reducing conduction loss versus standard bipolar architectures. |
| Synchronizable oscillator (up to 2MHz) | Allows noise-sensitive systems to align switching with master clock or avoid critical frequency bands. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering FPGA I/O banks and USB PHYs in compact DSL gateway hardware with limited board space and thermal margin. IC Role / Device Role / Timing Role: Primary 2.5V point-of-load regulator delivering up to 1.2A with fast transient response to handle burst data traffic. Use Value: High-frequency operation (1.25MHz) minimizes inductor size; 6µA shutdown current extends standby time between DSL handshakes. |
Use Scenario: Supplying core logic voltage for embedded controllers in fanless ultrabooks operating from single-cell or dual-cell Li-ion batteries. IC Role / Device Role / Timing Role: Main system regulator converting 7–16V battery pack voltage to stable 2.5V for microcontroller peripherals and sensors. Use Value: Wide 3–25V input range accommodates full battery discharge curve; exposed-pad MS8E package sustains 1A output at +85°C ambient. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary regulation stage in universal AC/DC wall adapters powering multiple downstream devices with varying voltage requirements. IC Role / Device Role / Timing Role: Fixed-output buck converter generating clean 2.5V rail from intermediate 5V or 12V bus, replacing linear regulators. Use Value: 85%+ efficiency at light loads reduces heat buildup in sealed plastic enclosures; low 1mA quiescent current improves no-load efficiency. |
Use Scenario: Power management in handheld test equipment requiring long runtime, low-noise analog supplies, and reliable cold-start capability. IC Role / Device Role / Timing Role: Main system supply regulating from 3.3V–18V input (e.g., 4xAA, LiFePO₄, or USB PD) to precise 2.5V reference rail. Use Value: Internal 1.2V reference and matched divider ensure <±2% output accuracy across –40°C to +125°C; SHDN pin enables controlled power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1767EMS8E-2.5#PBF | Identical electrical specs; MS8E package with exposed thermal pad (θJA = 40°C/W vs. 110°C/W). | Required where >1A continuous output at elevated ambient temperatures is needed without forced airflow. | Select when thermal performance is prioritized over cost or PCB real estate - same pinout, no layout change. |
| LT3502AEDD-2.5#PBF | Higher 3MHz switching frequency, 2A switch, but requires external feedback resistors even for fixed 2.5V output. | Better suited for ultra-compact designs needing sub-1mm height inductors, but adds component count and layout sensitivity. | Choose when board space is constrained and higher switching frequency justifies added design complexity and BOM cost. |
Compared with LT1767EMS8-2.5#PBF, the MS8E variant improves thermal headroom without altering circuit design, while LT3502AEDD-2.5#PBF trades simplicity and proven reliability for higher frequency and current capability at the expense of external component dependency.
Availability
LT1767EMS8-2.5#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 traceable sourcing.
Supply support for LT1767EMS8-2.5#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, documentation, and manufacturing continuity for the LT1767 family.
The LT1767 series was designed as a high-efficiency, thermally robust monolithic buck regulator targeting space-constrained, battery-sensitive applications where fixed-output simplicity and current-mode stability are essential.
FAQ
What is the maximum continuous output current of the LT1767EMS8-2.5#PBF?
The LT1767EMS8-2.5#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 adequate copper area on the GND pad, ≥1.2A is achievable at +85°C ambient in the MS8E package. Derating applies above 85°C ambient or with insufficient PCB copper.
Does the LT1767EMS8-2.5#PBF require external feedback resistors?
No. The LT1767EMS8-2.5#PBF integrates a precision resistor divider that connects the FB pin directly to the 2.5V output, eliminating external components. This ensures ±2% total output tolerance without resistor tolerance, temperature drift, or layout-induced errors - a key advantage over adjustable regulators.
Can the LT1767EMS8-2.5#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. When driven, the internal oscillator locks to the external frequency. If unused, SYNC must be grounded. Synchronization helps reduce EMI in noise-sensitive systems or align switching with system timing domains.
What is the purpose of the BOOST pin on the LT1767EMS8-2.5#PBF?
The BOOST pin provides a voltage higher than VIN to fully saturate the internal NPN power switch, reducing its effective on-resistance to ~0.22Ω. It requires an external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3), typically tied to VOUT. Without BOOST, switch losses increase significantly, degrading efficiency and thermal performance.
How does the LT1767EMS8-2.5#PBF handle undervoltage lockout (UVLO)?
The LT1767EMS8-2.5#PBF has dual UVLO: an internal VIN threshold (~2.6V) and a user-programmable SHDN pin threshold (1.33V). Pulling SHDN below 1.27V disables regulation and reduces supply current to 6µA. External resistor dividers on SHDN enable custom turn-on/turn-off hysteresis, ideal for battery protection circuits.
LT1767EMS8-2.5#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):
- 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
LT1767EMS8-2.5#PBF FAQ
1.How can I place an order for LT1767EMS8-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8-2.5#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 LT1767EMS8-2.5#PBF reliable?
The price and inventory of LT1767EMS8-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8-2.5#PBF?
LT1767EMS8-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8-2.5#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 LT1767EMS8-2.5#PBF?
For technical support, including LT1767EMS8-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8-2.5#PBF requirements.
6.How does Aetrix verify that LT1767EMS8-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8-2.5#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 LT1767EMS8-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8-2.5#PBF?
All LT1767EMS8-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8-2.5#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 LT1767EMS8-2.5#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1767EMS8-2.5#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
