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Analog Devices Inc. LT1767EMS8E-5#TRPBF
- Part No.:
- LT1767EMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,104
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Product details
Overview
LT1767EMS8E-5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an exposed-pad MSOP-8 package, featuring a fixed 5V output, 0.22Ω internal NPN switch, 1.2V feedback reference, and 2% output tolerance. It operates from 3V to 25V input and delivers high efficiency in compact battery-powered and distributed power systems.
For engineers reviewing the LT1767EMS8E-5#TRPBF datasheet, LT1767EMS8E-5#TRPBF pinout, LT1767EMS8E-5#TRPBF application, or LT1767EMS8E-5#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance of the MS8E package (θJA = 40°C/W), and real-world design implications of its current-mode control, BOOST pin operation, and 6µA shutdown current.
Technical Context
The LT1767EMS8E-5#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and an internal 1.25MHz oscillator synchronized up to 2MHz via the SYNC pin. Its bipolar NPN power switch is driven by a BOOST voltage generated externally to achieve low 330mV typical on-state drop at –1.5A.
Feedback regulation uses a precision 1.2V reference with internal resistor divider for fixed 5V output; the FB pin connects directly to VOUT. The VC pin serves as error amplifier output and current-limit threshold input, ranging from 0.35V (light load) to 0.9V (full load), enabling loop compensation and current clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates external feedback resistors and ensures stable regulation across temperature and load. |
| Switch Current Limit | 1.5A minimum - constant maximum switch current at all duty cycles enables predictable thermal design without foldback derating. |
| Switching Frequency | 1.25MHz typical - enables use of small chip inductors (e.g., 4.7µH) and reduces input/output filter size and EMI footprint. |
| Input Voltage Range | 3V to 25V - supports wide-range inputs including 12V industrial rails and multi-cell Li-ion batteries. |
| Shutdown Current | 6µA typical - minimizes battery drain in portable systems during standby or sleep modes. |
| Thermal Resistance | θJA = 40°C/W (MS8E package) - exposed pad soldered to PCB copper significantly improves power dissipation vs. standard MSOP (θJA = 110°C/W). |
| Feedback Reference | 1.2V ±1.5% - high-accuracy internal reference enables tight output tolerance without trimming. |
Pinout & Package
The LT1767EMS8E-5#TRPBF is housed in an 8-lead plastic MSOP package with exposed pad (MS8E), optimized for thermal performance (θJA = 40°C/W). The exposed pad must be soldered to a large PCB copper area connected to GND for effective heat dissipation.
| 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 (e.g., CMDSH-3) tied to VOUT or VIN. |
| 2: VIN | Power input and switch collector | Supplies internal circuitry and powers the NPN switch; requires local 10µF ceramic bypass capacitor due to high dI/dt transients. |
| 3: SW | Switch emitter | Drives inductor; swings negative during off-time - mandates external catch diode (e.g., UPS120) with VBR < 0.8V. |
| 4: GND | Power and signal reference | Internal tab and exposed pad are GND-connected; must tie to low-impedance ground plane to ensure load regulation and thermal performance. |
| 5: SYNC | External clock synchronization input | Logic-compatible input (20–80% duty cycle); synchronizes internal oscillator up to 2MHz to reduce beat frequencies in multi-regulator systems. |
| 6: VC | Error amplifier output / current limit control | 0.35V–0.9V analog control node; used for loop compensation, current clamping, or forced shutdown when pulled to GND. |
| 7: FB | Feedback input | Internally tied to 5V output; no external divider needed - simplifies layout and eliminates resistor tolerance errors. |
| 8: SHDN | Enable/disable control | 1.33V threshold; pull low to enter 6µA shutdown mode; doubles as accurate undervoltage lockout (UVLO) when biased externally. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency 0.22Ω switch | Reduces conduction loss and thermal rise at full 1.5A load - critical for enclosed or thermally constrained designs. |
| Exposed-pad MS8E package | Enables 40°C/W thermal resistance - allows 1.5A continuous operation at ambient temperatures up to 85°C with minimal copper area. |
| Current-mode control | Delivers fast transient response to load steps and inherent stability without complex compensation - ideal for dynamic loads like microcontrollers. |
| Synchronizable oscillator | Eliminates interference between multiple switching regulators by aligning switching edges - essential in dense PCB layouts with multiple DC/DCs. |
| Low 6µA shutdown current | Extends battery life in always-on portable devices (e.g., IoT sensors) where quiescent power dominates system energy budget. |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering FPGA I/O banks and USB PHYs from a 12V adapter in space-constrained DSL gateway hardware. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering up to 1.2A with tight ripple and fast load-step response. Use Value: MS8E package enables high-power density; 1.25MHz switching permits use of 4.7µH chip inductor and 2.2µF ceramic output capacitor, reducing board area by >40% vs. lower-frequency alternatives. |
Use Scenario: Generating 5V rail for SSD controllers and USB-C PD interface logic in ultrabook mainboards. IC Role / Device Role / Timing Role: Secondary non-isolated 5V supply derived from 12V or 19V main rail, operating under variable thermal load. Use Value: Exposed pad and 40°C/W θJA allow sustained 1.5A output without thermal throttling; SYNC pin enables noise-free coexistence with CPU VRMs. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Compact 5V/1.5A wall adapter for VoIP phones and smart home hubs requiring CE/UL compliance. IC Role / Device Role / Timing Role: High-efficiency primary-side buck converter replacing linear regulators to meet no-load power requirements (<30mW). Use Value: 6µA shutdown current and 1mA operating supply current meet Energy Star Level VI standby limits; fixed 5V output eliminates calibration overhead. |
Use Scenario: Power management in handheld medical monitors powered by dual-cell Li-ion (6–8.4V) with strict battery life targets. IC Role / Device Role / Timing Role: Main system rail regulator supporting intermittent 1.2A peak loads (e.g., Bluetooth transmission bursts). Use Value: Constant 1.5A switch current rating across all duty cycles ensures predictable thermal behavior during burst-mode operation; BOOST pin enables high efficiency even at low VIN. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#TRPBF | 4mm × 3mm DFN-12, 3MHz switching, 1.2A max output, integrated MOSFETs, 2.5µA quiescent current | Higher frequency enables smaller magnetics but lower max current; no BOOST pin required | Select for ultra-low IQ and space-constrained designs where 1.2A suffices and external boost components are undesirable. |
| TPS54302DDAR | SOT-23-6, 2.5–18V input, 3A output, 500kHz–2.5MHz adjustable frequency, integrated FETs, 25µA shutdown | Higher current capability and wider VIN range, but larger solution size and higher shutdown current | Select when >1.5A output or SOT-23 compatibility is required, accepting higher quiescent draw and reduced thermal efficiency in MSOP footprint. |
Compared with LTC3605EDE-5#TRPBF and TPS54302DDAR, the LT1767EMS8E-5#TRPBF offers superior thermal performance in its MS8E package (40°C/W), deterministic 1.5A current limit across all duty cycles, and proven BOOST-driven NPN architecture for high efficiency at low VIN - making it optimal for thermally demanding 5V/1.5A applications where component count and layout simplicity are prioritized over ultra-low IQ.
Availability
LT1767EMS8E-5#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, wall adapters, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1767EMS8E-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, documentation, and manufacturing continuity for the LT® series. Linear Technology pioneered high-performance analog ICs with emphasis on power management, precision signal conditioning, and robust industrial reliability.
The LT1767EMS8E-5#TRPBF belongs to Linear's monolithic buck regulator family designed for high-efficiency, high-density DC/DC conversion in space- and thermal-constrained applications - particularly targeting portable, telecom, and industrial systems needing fixed-output, low-component-count solutions.
FAQ
What is the maximum continuous output current of the LT1767EMS8E-5#TRPBF?
The LT1767EMS8E-5#TRPBF guarantees a minimum 1.5A switch current limit across all duty cycles and temperatures. Maximum continuous output current depends on thermal conditions: with proper PCB copper area on the exposed pad, it delivers 1.5A continuously at +85°C ambient. At +125°C junction, derating applies per thermal calculations using θJA = 40°C/W. Peak current remains 1.5A regardless of input voltage or duty cycle.
Does the LT1767EMS8E-5#TRPBF require external feedback resistors?
No. The LT1767EMS8E-5#TRPBF is the fixed 5V version: its internal resistor divider connects the FB pin directly to the output, eliminating external resistors. This ensures 5.0V ±2% accuracy without layout sensitivity or resistor tolerance errors. Only the adjustable LT1767 (no suffix) requires external R1/R2 for custom outputs.
How does the BOOST pin function in the LT1767EMS8E-5#TRPBF?
The BOOST pin supplies a voltage higher than VIN to fully saturate the internal NPN switch, reducing on-resistance to ~0.22Ω. It requires an external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3), typically tied to VOUT. When VOUT < 3.3V, connecting BOOST to VIN is recommended - but must stay within the BOOST pin's 35V absolute maximum rating.
Can the LT1767EMS8E-5#TRPBF be synchronized to an external clock?
Yes. The SYNC pin accepts logic-level signals (20–80% duty cycle) to synchronize the internal 1.25MHz oscillator up to 2MHz. This prevents beat frequencies in multi-regulator systems and reduces EMI. When unused, SYNC must be grounded. Synchronization reduces maximum duty cycle - DCMAX = 1 – 0.25µs × fCLK - which affects minimum input voltage at high fCLK.
What thermal considerations apply to the LT1767EMS8E-5#TRPBF MS8E package?
The LT1767EMS8E-5#TRPBF uses an exposed-pad MSOP (MS8E) with θJA = 40°C/W - significantly better than the standard MS8 (θJA = 110°C/W). To achieve this, the exposed pad must be soldered to a minimum 100mm² copper area connected to GND. Thermal vias (≥4× 0.3mm) under the pad are strongly recommended to transfer heat to inner or bottom layers.
LT1767EMS8E-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):
- 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-5#TRPBF FAQ
1.How can I place an order for LT1767EMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-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-5#TRPBF reliable?
The price and inventory of LT1767EMS8E-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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-5#TRPBF?
LT1767EMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-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-5#TRPBF?
For technical support, including LT1767EMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-5#TRPBF?
All LT1767EMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-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-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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