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Analog Devices Inc. LT1767EMS8#TRPBF
- Part No.:
- LT1767EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1767EMS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,885
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Product details
Overview
LT1767EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an 8-lead MSOP package with exposed pad (MS8E). It integrates a 0.22Ω NPN power switch, current-mode control loop, and 1.2V feedback reference, delivering fixed 3.3V output with ±2% tolerance across 3V–25V input for battery-powered portable computers and DSL modems.
For engineers reviewing the LT1767EMS8#TRPBF datasheet, LT1767EMS8#TRPBF pinout, LT1767EMS8#TRPBF application, or LT1767EMS8#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional differences, and supply support for industrial embedded and OEM power designs.
Technical Context
The LT1767EMS8#TRPBF implements constant-frequency current-mode control using an internal 1.25MHz oscillator and cycle-by-cycle peak current sensing. Its bipolar NPN switch is driven via the BOOST pin to achieve saturation, reducing conduction loss to ≤400mV at –1.5A.
It features dual-loop regulation: the error amplifier sets the current limit threshold at the VC pin, while the current comparator resets the RS flip-flop to terminate each on-time. The fixed 3.3V output version integrates the feedback divider internally, tying FB directly to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), eliminates external resistor divider and reduces BOM count. |
| Switch Current Limit | 1.5A minimum over full temperature range, enables stable 1.2A continuous output with thermal derating. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz over temp), allows use of compact 2.2–4.7µH chip inductors and <10µF ceramic output caps. |
| Input Voltage Range | 3V to 25V, supports Li-ion battery packs (3.0–4.2V), 5V/12V rails, and 24V industrial inputs. |
| Feedback Reference | 1.2V internal reference with ±0.018V max drift over –40°C to 125°C, ensures tight output regulation under load/line transients. |
| Shutdown Current | 6µA typical at VIN = 25V, extends battery life in always-on portable systems during sleep mode. |
| Thermal Resistance θJA | 40°C/W (MS8E package), enables 1.2A operation at 125°C ambient with ≥1 cm² copper pour under exposed pad. |
Pinout & Package
LT1767EMS8#TRPBF uses the 8-lead plastic MSOP package with exposed pad (MS8E), optimized for low thermal resistance (θJA = 40°C/W) when soldered to ≥1 cm² PCB copper area connected to GND.
| 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 with CMDSH-3 diode. |
| 2 - VIN | Power switch collector & IC supply | Accepts 3V–25V input; powers internal bias regulator and drives switch; bypass with 10µF ceramic near pin. |
| 3 - SW | Switch emitter node | Drives inductor; swings from ~0V to VIN during operation; requires external catch diode (e.g., UPS120) clamped to GND. |
| 4 - GND | Power and signal reference | Internal tab and exposed pad connect to GND; must tie to large copper plane to maintain θJA = 40°C/W and prevent ground bounce. |
| 5 - SYNC | External clock synchronization input | Logic-compatible (1.5–2.2V threshold); accepts 1.25–2MHz external clock to reduce EMI or align with system timing. |
| 6 - VC | Error amplifier output / current limit control | 0.35V–0.9V range sets switch current trip point; used for compensation (type II/III) or current limiting override. |
| 7 - FB | Feedback input (internally tied to VOUT) | Fixed 3.3V version connects FB internally to output; no external divider needed-reduces layout sensitivity and component count. |
| 8 - SHDN | Enable/disable control | 1.33V threshold with 7µA hysteresis; pull high or float for operation; ground to shut down and reduce IQ to 6µA. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 1.25MHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing across input/output conditions without frequency foldback. |
| High-efficiency 0.22Ω integrated NPN switch | Delivers ≥85% efficiency at 1.2A/3.3V from 12V input, minimizing heat rise in space-constrained MSOP layout. |
| Current-mode control with cycle-by-cycle limiting | Provides inherent overload protection and fast transient response (<10µs) to load steps without external compensation tuning. |
| Synchronizable to 2MHz | Allows EMI reduction via spread-spectrum clock alignment or noise avoidance in multi-rail systems with shared timing sources. |
| Exposed-pad MS8E thermal package | Reduces junction-to-ambient thermal resistance by 64% vs standard MS8 (40°C/W vs 110°C/W), enabling higher sustained output current. |
Applications
| DSL Modem Power Supply | Portable Computer Core Rail |
|---|---|
Use Scenario: Step-down from 12V adapter or battery to clean 3.3V for PHY and controller ICs in compact DSL modems. IC Role / Device Role / Timing Role: Primary DC/DC buck regulator providing regulated 3.3V with <10mV ripple at 1.2A peak load. Use Value: High-frequency operation minimizes filter size; SYNC pin enables EMI compliance with DOCSIS timing standards. |
Use Scenario: On-board 3.3V rail generation for USB controllers, display interfaces, and I/O peripherals in ultraportable laptops. IC Role / Device Role / Timing Role: Fixed-output switching regulator replacing linear LDOs to improve battery runtime and reduce thermal load. Use Value: 6µA shutdown current extends standby time; MS8E package fits tight board areas near connectors or displays. |
| Industrial Wall Adapter Interface | Battery-Powered Handheld Instrument |
Use Scenario: Regulating unregulated 5–24V wall adapter outputs to stable 3.3V for microcontroller and sensor subsystems. IC Role / Device Role / Timing Role: Input-flexible buck converter handling wide line variations while maintaining ±2% output accuracy. Use Value: 3V–25V input range accommodates aging adapters and brownout conditions without dropout or reset. |
Use Scenario: Powering ARM Cortex-M based data loggers from single-cell Li-ion (3.0–4.2V) with minimal quiescent consumption. IC Role / Device Role / Timing Role: Efficient step-down regulator operating down to 3V input, supporting deep discharge to 3.0V before shutdown. Use Value: Low 1mA operating supply current preserves battery capacity; UVLO via SHDN pin prevents system instability at end-of-life voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 1.2A, integrated MOSFETs, 2.5–5.5V input only | Not suitable for 12V/24V inputs; better for low-VIN portable apps requiring ultra-small inductors | Select LTC3605EDE#TRPBF only if input is strictly ≤5.5V and 4MHz switching is required for size reduction. |
| TPS54331DR | 3.5A adjustable buck, 500kHz, SOIC-8, 3.5–28V input, external FET driver | Higher current but lower frequency; requires external compensation and larger magnetics | Choose TPS54331DR when >1.5A output or wider input range (up to 28V) is needed, accepting larger solution size. |
Compared with LT1767EMS8#TRPBF, LTC3605EDE#TRPBF offers higher frequency and synchronous rectification but lacks 3V–25V input flexibility, while TPS54331DR delivers higher current and broader input range at the cost of reduced integration and larger footprint.
Availability
LT1767EMS8#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1767EMS8#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 high-performance analog and power management product lines with rigorous reliability testing and automotive-grade qualification programs.
The LT1767EMS8#TRPBF belongs to Linear's monolithic buck regulator family designed for space-constrained, high-efficiency DC/DC conversion in portable, industrial, and communications equipment where thermal performance and input voltage flexibility are critical.
FAQ
What is the maximum continuous output current of the LT1767EMS8#TRPBF?
The LT1767EMS8#TRPBF delivers up to 1.2A continuous output current at 3.3V with proper thermal management. This assumes 12V input, 25°C ambient, and ≥1 cm² copper pour under the exposed pad. At 125°C ambient, derating applies per the thermal curves in the datasheet, reducing usable current to ~0.8A due to junction temperature limits. The 1.5A switch rating is peak-limited and subject to thermal constraints.
Does the LT1767EMS8#TRPBF require an external feedback resistor divider?
No, the LT1767EMS8#TRPBF does not require an external feedback resistor divider. As the fixed 3.3V version, it integrates the resistor network internally and connects the FB pin directly to the output. This eliminates layout sensitivity, reduces component count, and ensures guaranteed ±2% output tolerance without calibration or trimming.
Can the LT1767EMS8#TRPBF operate from a 3.0V input source?
Yes, the LT1767EMS8#TRPBF operates from a minimum 3.0V input, meeting its specified 3V–25V range. At 3.0V input and 3.3V output, duty cycle approaches 80%, requiring careful inductor selection (e.g., 1.5–2.2µH) and verification of boost capacitor recharge. Efficiency drops below 70% in this condition, but regulation is maintained per datasheet electrical characteristics.
What is the purpose of the BOOST pin on the LT1767EMS8#TRPBF?
The BOOST pin on the LT1767EMS8#TRPBF supplies a voltage higher than VIN to the base of the internal NPN power switch, ensuring saturation and minimizing VCE(sat). It requires a 0.1µF ceramic capacitor and Schottky diode (e.g., CMDSH-3) connected between BOOST and either VOUT (for ≥3.3V outputs) or VIN (with caution to avoid exceeding 35V absolute max). Without BOOST, switch loss increases significantly.
Is the LT1767EMS8#TRPBF pin-compatible with other variants in the LT1767 family?
Yes, the LT1767EMS8#TRPBF is pin-compatible with all LT1767 MS8/MS8E variants-including LT1767EMS8-1.8#TRPBF, LT1767EMS8-2.5#TRPBF, and LT1767EMS8-5#TRPBF-as well as the adjustable LT1767EMS8#TRPBF. All share identical 8-pin MSOP layout, pin functions, and thermal pad configuration, enabling drop-in replacement across output voltages with no PCB changes required.
LT1767EMS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 22.5V
- 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#TRPBF FAQ
1.How can I place an order for LT1767EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8#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#TRPBF reliable?
The price and inventory of LT1767EMS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8#TRPBF?
LT1767EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8#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#TRPBF?
For technical support, including LT1767EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8#TRPBF?
All LT1767EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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