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Analog Devices Inc. LT1767EMS8E-2.5#TRPBF
- Part No.:
- LT1767EMS8E-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-2.5#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 2.5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,516
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Product details
Overview
LT1767EMS8E-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz step-down switching regulator with integrated 1.5A/0.22Ω NPN power switch, fixed 2.5V output, ±2% output tolerance, and MS8E exposed-pad package for enhanced thermal performance. It operates from 3V to 25V input and delivers up to 1.5A output current in compact portable power supplies.
For engineers reviewing the LT1767EMS8E-2.5#TRPBF datasheet, LT1767EMS8E-2.5#TRPBF pinout, LT1767EMS8E-2.5#TRPBF application, or LT1767EMS8E-2.5#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design constraints for battery-powered systems, DSL modems, and distributed power rails.
Technical Context
The LT1767EMS8E-2.5#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and internal 1.25MHz oscillator synchronized up to 2MHz. Its BOOST pin enables saturation of the on-die NPN switch via external capacitor-diode network, reducing conduction loss to ~330mV at 1.5A.
It features a 1.2V internal feedback reference with fixed 2.5V output set by internal resistor divider, 1.33V shutdown threshold with 7µA hysteresis, and VC pin serving as error amplifier output and current-limit comparator input-enabling loop compensation and current clamping without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% over temperature and line/load, set by internal resistor divider - eliminates external feedback network. |
| Switch Current Limit | 1.5A typical, constant across all duty cycles - enables predictable current limiting in both continuous and discontinuous conduction modes. |
| Switching Frequency | 1.25MHz typical, synchronizable to 2MHz - allows use of small chip inductors (e.g., 2.2–4.7µH) and low-profile ceramic capacitors. |
| Input Voltage Range | 3V to 25V - supports wide-range inputs including 12V industrial rails and 3.3–24V battery stacks. |
| Shutdown Current | 6µA typical - extends battery life in portable systems during sleep or standby states. |
| Thermal Resistance θJA | 40°C/W (MS8E exposed pad) - enables 1.5A operation at ambient up to 85°C with minimal copper area (≥1 cm² GND pad). |
| Feedback Reference | 1.2V internal reference - ensures stable regulation even with varying load transients and input ripple. |
Pinout & Package
LT1767EMS8E-2.5#TRPBF uses an 8-lead plastic MSOP package with exposed thermal pad (MS8E), where the exposed pad is electrically connected to GND and must be soldered to ≥1 cm² PCB copper area for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost supply input | Drives internal NPN switch base above VIN via external capacitor-diode; requires ≥2.7V headroom to maintain saturation and minimize VCE(sat). |
| 2: VIN | Main power input | Supplies internal bias regulator and collector of on-die NPN switch; must be bypassed with low-ESR ceramic capacitor ≤5mm from pin. |
| 3: SW | Switch emitter node | Connects to inductor; swings negative during off-time - requires Schottky catch diode (e.g., UPS120) with VBR < 0.8V. |
| 4: GND | Power and signal reference | Reference for FB, VC, SHDN; exposed pad tied to GND - must connect to large copper pour to achieve rated θJA. |
| 5: SYNC | External clock input | Logic-compatible sync input (20–80% duty); extends frequency range to 2MHz - reduces EMI and enables multi-phase synchronization. |
| 6: VC | Error amplifier output | Controls peak switch current; voltage ranges from 0.35V (light load) to 0.9V (1.5A); usable for loop compensation or current override. |
| 7: FB | Feedback input | Internally connected to 2.5V output - no external divider needed; monitors regulation accuracy and enables current foldback below 0.5V. |
| 8: SHDN | Enable/disable control | 1.33V threshold with 7µA hysteresis - provides precise undervoltage lockout; pull high or float for operation, ground to disable. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A NPN switch with 0.22Ω RCE(sat) | Enables high-efficiency buck conversion without external MOSFET or driver - reduces BOM count and layout complexity. |
| Constant 1.25MHz switching frequency | Guarantees predictable EMI profile and enables consistent filter design using standard 2.2–4.7µH chip inductors. |
| MS8E exposed-pad thermal package | Delivers 40°C/W junction-to-ambient thermal resistance - supports full 1.5A output at 85°C ambient with minimal PCB copper. |
| Current-mode control with cycle-by-cycle limiting | Provides fast transient response (<10µs) and inherent stability without external compensation - simplifies design for variable loads. |
| Low 6µA shutdown current | Extends runtime in battery-powered applications such as portable computers and DSL modems during idle or suspend states. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering PHY, DSP, and interface ICs from 12V or 19V adapter in space-constrained DSL modem chassis. IC Role / Device Role / Timing Role: Primary 2.5V point-of-load regulator delivering up to 1.5A with tight output tolerance and fast load-step response. Use Value: Enables single-stage conversion from adapter rail - avoids cascaded regulators, reduces heat, and meets EN55022 conducted EMI limits via 1.25MHz fixed frequency. |
Use Scenario: Supplying core logic voltage to USB controllers, audio codecs, or display interfaces in ultraportable notebooks. IC Role / Device Role / Timing Role: Compact, thermally efficient 2.5V regulator operating from Li-ion battery (3.0–4.2V) or 5V USB-PD rail. Use Value: MS8E package with 40°C/W θJA sustains 1.5A output at 70°C ambient - eliminates need for heatsinks or airflow in fanless designs. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary 2.5V rail generation in universal AC/DC wall adapters supporting multiple output voltages. IC Role / Device Role / Timing Role: High-efficiency buck stage converting 12V intermediate bus to regulated 2.5V for downstream logic. Use Value: 1.25MHz operation allows use of 2.2µH inductor and 10µF ceramic input cap - reduces adapter size and improves light-load efficiency vs. lower-frequency alternatives. |
Use Scenario: Powering microcontroller peripherals and sensors in handheld test equipment or medical monitors. IC Role / Device Role / Timing Role: Low-quiescent, shutdown-capable 2.5V regulator enabling deep-sleep modes with <10µA system leakage. Use Value: 6µA shutdown current and 1mA operating supply current extend battery life - critical for devices requiring >100-hour standby duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMSE-2.5#PBF | 4MHz synchronous buck, 1.2A max, integrated MOSFETs, 2.5V fixed output, 2.5V–5.5V input only | Higher frequency enables smaller passives but limited to low-input applications - unsuitable for 12V+ inputs. | Select when input is ≤5.5V and board space is extremely constrained; avoid for 12V/24V industrial rails. |
| TPS54331DR | 3.5A adjustable buck, 570kHz, external MOSFETs, 3.5V–28V input, requires external feedback resistors | Higher current and wider input range, but needs compensation network and external FETs - increases BOM and layout effort. | Select when >1.5A output or adjustable VOUT is required; not drop-in for fixed 2.5V designs. |
Compared with LTC3605EMSE-2.5#PBF and TPS54331DR, the LT1767EMS8E-2.5#TRPBF uniquely balances 1.5A capability, 3–25V input flexibility, fixed 2.5V output, and MS8E thermal performance - making it optimal for mid-power industrial and portable applications where simplicity and thermal robustness are prioritized over ultra-high frequency or ultra-low quiescent current.
Availability
LT1767EMS8E-2.5#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered systems requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LT1767EMS8E-2.5#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 full product support, datasheet archives, and application engineering for legacy Linear parts including the LT1767 family.
The LT1767 series was designed as a monolithic, high-frequency buck regulator targeting space- and thermally constrained portable and telecom power applications - emphasizing integration, thermal efficiency, and ease of use without external compensation.
FAQ
What is the maximum output current of the LT1767EMS8E-2.5#TRPBF under continuous conduction mode?
The LT1767EMS8E-2.5#TRPBF delivers up to 1.5A output current with thermal derating. At 25°C ambient and proper PCB copper (≥1 cm² GND pad), full 1.5A is achievable. Above 85°C ambient, output current must be reduced per the thermal derating curve - e.g., ~1.1A at 100°C ambient. The 1.5A switch current limit remains constant across all duty cycles, unlike many competitors with foldback behavior.
Can the LT1767EMS8E-2.5#TRPBF operate from a 3.3V input to deliver 2.5V at 1.5A?
Yes, the LT1767EMS8E-2.5#TRPBF supports 3V minimum input and can regulate 2.5V from 3.3V input. However, at such low VIN–VOUT differential, BOOST pin operation becomes critical: the boost diode must be tied to VIN (not VOUT) to ensure ≥2.7V drive headroom for the internal NPN switch. Efficiency drops to ~82% at 3.3V→2.5V/1.5A due to higher conduction losses.
Does the LT1767EMS8E-2.5#TRPBF require external compensation components?
No, the LT1767EMS8E-2.5#TRPBF uses internal compensation optimized for standard 2.2–4.7µH inductors and ceramic output capacitors. The VC pin is pre-compensated and requires no external RC network for stable operation. Only if custom loop dynamics (e.g., faster transient response) are needed should external compensation be added - otherwise, leave VC unconnected except for optional current clamping.
What is the purpose of the BOOST pin on the LT1767EMS8E-2.5#TRPBF, and how is it configured?
The BOOST pin supplies elevated voltage to the base of the internal NPN switch, enabling saturation and minimizing VCE(sat) to ~330mV. It is configured with a 0.1µF capacitor and Schottky diode (e.g., CMDSH-3): diode anode connects to VOUT (for VIN ≥5V) or VIN (for low-VIN applications), cathode to BOOST, capacitor between BOOST and SW. This generates ~VIN+VOUT drive voltage.
Is the LT1767EMS8E-2.5#TRPBF pin-compatible with other variants in the LT1767 family?
Yes, all LT1767 variants-including LT1767EMS8E-1.8#TRPBF, LT1767EMS8E-3.3#TRPBF, and LT1767EMS8E-5#TRPBF-share identical MS8E package, pinout, and electrical interface. Only the internal feedback divider differs; no PCB changes are needed when substituting fixed-output versions for different VOUT requirements.
LT1767EMS8E-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- 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):
- 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#TRPBF FAQ
1.How can I place an order for LT1767EMS8E-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-2.5#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 LT1767EMS8E-2.5#TRPBF reliable?
The price and inventory of LT1767EMS8E-2.5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-2.5#TRPBF?
LT1767EMS8E-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-2.5#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 LT1767EMS8E-2.5#TRPBF?
For technical support, including LT1767EMS8E-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-2.5#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8E-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-2.5#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 LT1767EMS8E-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-2.5#TRPBF?
All LT1767EMS8E-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-2.5#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 LT1767EMS8E-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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