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Analog Devices Inc. LT1767EMS8E-3.3#TRPBF
- Part No.:
- LT1767EMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 3.3V 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,225
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Product details
Overview
LT1767EMS8E-3.3#TRPBF 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 3.3V output, 0.22Ω internal NPN switch, 2% output tolerance, and operation from 3V to 25V input. It delivers up to 1.2A at 3.3V in typical DSL modem and portable computer power rails.
For engineers reviewing the LT1767EMS8E-3.3#TRPBF datasheet, LT1767EMS8E-3.3#TRPBF pinout, LT1767EMS8E-3.3#TRPBF application, or LT1767EMS8E-3.3#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 substitution guidance for fixed-output buck regulators in battery-powered and distributed power systems.
Technical Context
The LT1767EMS8E-3.3#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and internal slope compensation, enabling stable operation across 0–100% duty cycle without subharmonic oscillation. Its bipolar NPN power switch is driven via an external BOOST circuit to achieve saturation and low conduction loss (330mV typ. at –1.5A).
It integrates a 1.2V feedback reference and internal resistor divider for fixed 3.3V output, eliminating external resistors. The VC pin serves as both error amplifier output and current limit threshold input, supporting loop compensation and current clamping. Synchronization capability extends oscillator range to 2MHz for EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), internally trimmed; no external feedback resistors required. |
| Switch Current Limit | 1.5A minimum over full temperature range; remains constant across all duty cycles. |
| Switching Frequency | 1.25MHz typical (1.1–1.5MHz over temp); synchronizable to external 1.5–2MHz clock. |
| Input Voltage Range | 3V to 25V continuous; undervoltage lockout activates below 2.47V (min). |
| Efficiency | Up to 95% at 12V→3.3V/1.2A; enabled by 0.22Ω switch RCE(sat) and BOOST-assisted drive. |
| Thermal Resistance | θJA = 40°C/W (MS8E package with exposed pad soldered to PCB copper area). |
| Shutdown Current | 6µA max at VIN = 25V; enables ultra-low-power standby in battery systems. |
Pinout & Package
LT1767EMS8E-3.3#TRPBF uses an 8-lead plastic MSOP package with exposed thermal pad (MS8E), rated for –40°C to 125°C junction temperature. The exposed pad must be soldered to a large PCB copper area for thermal performance (θJA = 40°C/W).
| 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 tied to VOUT or VIN. |
| 2 - VIN | Main power input | Supplies internal bias regulator and collector of NPN switch; supports 3V–25V; bypass capacitor must be placed close to minimize dI/dt spikes. |
| 3 - SW | Switch emitter node | Connects to inductor; swings negative during off-time; requires external catch diode (e.g., UPS120) clamped to GND. |
| 4 - GND | Power and signal reference | Reference for regulated output and internal circuits; exposed pad is electrically connected to GND and must be thermally anchored. |
| 5 - SYNC | External clock input | Logic-compatible input (1.5–2.2V threshold); synchronizes internal oscillator up to 2MHz; tie to GND if unused. |
| 6 - VC | Error amplifier output / current limit control | 0.35V–0.9V range sets switch current trip point; used for loop compensation or current override. |
| 7 - FB | Feedback input | Internally connected to 3.3V output; no external divider needed; monitors regulation accuracy and enables current foldback below 0.5V. |
| 8 - SHDN | Enable/disable control | 1.33V threshold; pull low or ≤1.27V to shut down; 6µA quiescent current achieved when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency integrated switch | 0.22Ω NPN switch enables >95% efficiency at 12V→3.3V/1.2A with minimal heat rise in MS8E package. |
| Constant-current limit across duty cycle | 1.5A switch current limit maintained at all duty cycles-no derating required for high-VIN/low-VOUT operation. |
| Exposed-pad thermal management | MS8E package achieves θJA = 40°C/W (vs. 110°C/W for standard MS8), enabling 1.2A continuous output without heatsink. |
| Fixed-output simplicity | Internal 3.3V feedback divider eliminates external resistors, reducing BOM count and layout sensitivity. |
| Synchronization for EMI control | SYNC pin accepts 1.5–2MHz external clock to align switching edges and reduce spectral peaks in noise-sensitive systems. |
Applications
| DSL Modem Power Supply | Portable Computer Core Rail |
|---|---|
Use Scenario: Provides clean 3.3V rail for ADSL line driver ICs and PHY processors in compact, fanless modems. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 3.3V from 12V wall adapter or PoE-derived input. Use Value: High-frequency 1.25MHz operation allows use of small 4.7µH chip inductors and ceramic capacitors, minimizing board space. |
Use Scenario: Powers USB controller, display interface, and low-power MCU subsystems in clamshell notebooks. IC Role / Device Role / Timing Role: Fixed-output buck regulator converting main battery (7–12V) to stable 3.3V system rail. Use Value: 6µA shutdown current extends battery life during suspend mode; BOOST-assisted drive ensures regulation down to 3V input. |
| Industrial Wall Adapter Module | Battery-Powered Test Equipment |
Use Scenario: Integrated into compact 24VAC-to-3.3V DC wall adapters for IoT gateways and smart sensors. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping 24V down to 3.3V with minimal external components. Use Value: Wide 3V–25V input range accommodates unregulated 24V supplies; thermal robustness (θJA = 40°C/W) enables sealed enclosure operation. |
Use Scenario: Powers microcontroller, ADC, and wireless transceiver in handheld multimeters and calibration tools. IC Role / Device Role / Timing Role: Primary power converter from single Li-ion cell (3.0–4.2V) or dual-cell pack (6–8.4V). Use Value: Undervoltage lockout (2.47V min) prevents brownout during deep discharge; low quiescent current preserves runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMS8E-3.3#TRPBF | 4MHz synchronous buck, 1.2A max, integrated MOSFETs, 2.5V–5.5V input only. | Requires lower input voltage; unsuitable for 12V+ inputs; higher efficiency above 1A but limited VIN range. | Select LTC3605EMS8E-3.3#TRPBF only when input is ≤5.5V and 4MHz switching is needed for ultra-small magnetics. |
| TPS54331DR | 3.5A adjustable buck, 500kHz, SOIC-8, 3.5V–28V input, requires external feedback resistors. | Higher current capability but larger footprint and less thermal efficiency than MS8E package; no exposed pad. | Choose TPS54331DR when >1.5A output or wider input range (up to 28V) is required, accepting larger size and higher θJA. |
Compared with LT1767EMS8E-3.3#TRPBF, LTC3605EMS8E-3.3#TRPBF offers higher frequency and synchronous rectification but sacrifices input voltage range, while TPS54331DR trades thermal performance and fixed-output simplicity for higher current and broader VIN support.
Availability
LT1767EMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and industrial wall adapters requiring stable component supply, long-term lifecycle support, and consistent thermal performance in compact MSOP-8E packaging.
Supply support for LT1767EMS8E-3.3#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 qualification and long-term support.
The LT1767 family was designed for high-efficiency, space-constrained DC/DC conversion in battery-powered and distributed power systems, emphasizing thermal robustness, fixed-output simplicity, and wide-input operation without external compensation.
FAQ
What is the maximum continuous output current of the LT1767EMS8E-3.3#TRPBF?
The LT1767EMS8E-3.3#TRPBF delivers up to 1.2A continuously under typical conditions (e.g., 12V input, 3.3V output, 25°C ambient, with proper PCB copper area on the exposed pad). Maximum output depends on thermal design: at 125°C junction temperature, current derates to ~0.8A. The internal 1.5A switch current limit remains constant across all duty cycles, but thermal limits govern sustained output.
Does the LT1767EMS8E-3.3#TRPBF require external feedback resistors?
No. The LT1767EMS8E-3.3#TRPBF integrates the precise resistor divider for 3.3V output; the FB pin is internally connected to the output. External resistors are unnecessary and would disrupt regulation. This simplifies layout, improves accuracy, and eliminates resistor tolerance errors affecting output voltage.
Can the LT1767EMS8E-3.3#TRPBF operate from a single Li-ion battery?
Yes. With a minimum input voltage of 2.47V (UVLO threshold) and guaranteed operation from 3V, the LT1767EMS8E-3.3#TRPBF supports single-cell Li-ion (2.7–4.2V) and LiFePO4 (2.0–3.6V) batteries. At low VIN near 3V, output current is reduced due to duty cycle and thermal constraints, but regulation is maintained.
What is the purpose of the BOOST pin on the LT1767EMS8E-3.3#TRPBF?
The BOOST pin on the LT1767EMS8E-3.3#TRPBF supplies elevated gate drive voltage to the internal NPN switch, enabling saturation and minimizing conduction loss (typ. 330mV at –1.5A). It requires an external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3) tied to VOUT or VIN to generate ~VOUT + VIN. Without BOOST, switch loss increases significantly.
How does the LT1767EMS8E-3.3#TRPBF handle thermal management?
The LT1767EMS8E-3.3#TRPBF uses an MS8E package with an exposed GND pad thermally connected to the die. When soldered to ≥1 cm² of 2-oz copper on the PCB, it achieves θJA = 40°C/W-more than 2.5× better than standard MSOP. This allows 1.2A continuous output without heatsinks. Thermal shutdown activates at 125°C junction temperature.
LT1767EMS8E-3.3#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):
- 3.3V
- 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-3.3#TRPBF FAQ
1.How can I place an order for LT1767EMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E-3.3#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-3.3#TRPBF reliable?
The price and inventory of LT1767EMS8E-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E-3.3#TRPBF?
LT1767EMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E-3.3#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-3.3#TRPBF?
For technical support, including LT1767EMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1767EMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E-3.3#TRPBF?
All LT1767EMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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