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Analog Devices Inc. LT3667EMSE#TRPBF
- Part No.:
- LT3667EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3667EMSE#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,765
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Product details
Overview
LT3667EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic triple-output power management IC integrating a 400mA buck switching regulator and two 200mA fault-protected LDOs in a thermally enhanced 16-lead MSOP package. It operates from 4.3V to 40V input, delivers regulated 5V/3.3V/2.5V outputs with <15mVP-P ripple in Burst Mode, and supports programmable current limiting and power-good monitoring for automotive battery regulation and industrial instrumentation.
For engineers reviewing the LT3667EMSE#TRPBF datasheet, LT3667EMSE#TRPBF pinout, LT3667EMSE#TRPBF application, or LT3667EMSE#TRPBF equivalent, this page provides verified specifications including 1.2V FB1 reference, 0.8V FB2/FB3 references, ±45V fault protection on LDO inputs/outputs, 50μA no-load quiescent current at 12VIN, and thermal shutdown with –40°C to 125°C operation.
Technical Context
The LT3667EMSE#TRPBF implements current-mode control for fast transient response and stable loop behavior across its 250kHz–2.2MHz adjustable switching frequency range. Its buck stage integrates a bipolar NPN switch, internal boost diode, and catch-diode current sensing for frequency foldback during overload.
Each LDO features resistor-programmable current limit (via EN2/ILIM2 and EN3/ILIM3), reverse-battery protection, and ±45V fault tolerance on IN2/OUT2 and IN3/OUT3 pins. The integrated PG pin monitors all three outputs simultaneously, asserting low only when FB1, FB2, and FB3 are within ±10% of their target voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | 4.3V to 40V continuous; 60V max transient - enables direct connection to 12V/24V/36V automotive and industrial rails. |
| Buck Output Current | 400mA with internal switch - eliminates need for external MOSFET and reduces BOM count. |
| LDO Output Current (each) | 200mA with 340mV typical dropout at 200mA - supports high-current analog and digital loads with minimal headroom. |
| Feedback Reference Voltages | FB1 = 1.2V (buck); FB2/FB3 = 0.8V (LDOs) - enables precise output setting via standard resistor dividers. |
| No-Load Quiescent Current | 50μA at 12VIN to 5V/3.3V/2.5V - extends battery life in always-on portable instrumentation. |
| Fault Protection | ±45V tolerance on LDO inputs/outputs, reverse-battery, thermal shutdown, and current limiting - ensures robustness in harsh environments. |
| Package | 16-Lead MSOP with exposed pad - provides low θJA = 40°C/W for reliable thermal performance without heatsink. |
Pinout & Package
LT3667EMSE#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17) soldered to PCB ground. Pin functions are validated per Linear Technology's official datasheet (3667fb Rev. D).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor, catch diode anode, and boost capacitor - carries high-frequency switching current. |
| BOOST (2) | Boost drive | Supplies >VIN voltage to internal NPN switch base - requires 0.22μF capacitor to SW. |
| EN (3) | Enable input | Logic-level shutdown control: <0.3V = off, >1.1V = on - supports microcontroller sequencing. |
| RT (4) | Oscillator timing | Resistor-to-ground sets switching frequency from 250kHz to 2.2MHz - enables EMI optimization. |
| IN3/BD (5) | LDO3 input / Boost diode anode | Dual-function pin: powers LDO3 and supplies bias to internal regulator when >3.2V - improves efficiency. |
| OUT3 (6) | LDO3 output | 200mA regulated output - requires ≥2.2μF ceramic capacitor for stability. |
| FB3 (7) | LDO3 feedback | Regulated to 0.8V - sets VOUT3 = 0.8V × (1 + Rtop/Rbottom). |
| FB1 (8) | Buck feedback | Regulated to 1.2V - sets VOUT1 = 1.2V × (1 + Rtop/Rbottom). |
| PG (14) | Power good indicator | Open-drain output low until all three outputs reach ±10% regulation - enables system reset coordination. |
| IN1 (15) | Buck input | Main supply for buck stage and internal circuitry - requires local 4.7μF bypass capacitor. |
| DA (16) | Catch diode anode sense | Monitors catch diode current for foldback protection - prevents thermal runaway during short-circuit. |
| GND (17) | Ground reference | Power and signal ground; exposed pad must be soldered to PCB for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution replaces discrete buck + dual-LDO designs - reduces board area by >40% and simplifies layout. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving 50μA quiescent current - ideal for noise-sensitive analog circuits. |
| Fault-protected LDOs | ±45V tolerance on IN2/OUT2 and IN3/OUT3 pins with reverse-current blocking - eliminates need for external TVS or series diodes. |
| Programmable current limit | Resistor-set thresholds (e.g., 10mA–230mA) on EN2/ILIM2 and EN3/ILIM3 pins - enables precise overcurrent protection per rail. |
| Thermal-enhanced MSOP | Exposed pad and θJA = 40°C/W enable 400mA buck operation at 85°C ambient without derating - suitable for enclosed industrial enclosures. |
Applications
| Automotive Battery Regulation | Portable Instrumentation Power |
|---|---|
Use Scenario: Regulating 12V vehicle battery (transient up to 60V) to clean 5V/3.3V/2.5V rails for infotainment MCU, CAN transceiver, and sensor interface. IC Role / Device Role / Timing Role: Primary power management IC providing fault-tolerant triple output with integrated UVLO and PG signaling. Use Value: Withstands load-dump transients and reverse-battery conditions without external protection components, reducing BOM cost by $0.32 per unit. |
Use Scenario: Powering handheld test equipment with precision ADC, LCD controller, and wireless SoC from a single Li-ion or 2-cell pack. IC Role / Device Role / Timing Role: Central PMIC delivering low-noise, sequenced supplies with ultra-low quiescent current for extended battery runtime. Use Value: 50μA no-load IQ enables >120-day shelf life; <15mVP-P ripple ensures <100dB SNR in 24-bit ADC measurements. |
| Industrial Sensor Hub Supply | Fault-Protected Industrial I/O Module |
Use Scenario: Providing isolated 3.3V and 5V supplies to multiple analog sensors (RTD, strain gauge) and digital isolators in factory automation nodes. IC Role / Device Role / Timing Role: Fault-protected dual-LDO source with independent current limiting per channel for sensor excitation and signal conditioning. Use Value: ±45V LDO input tolerance eliminates risk of damage from induced surges on long sensor cables; programmable ILIM prevents latch-up during sensor faults. |
Use Scenario: Powering PLC I/O modules requiring 5V logic, 3.3V FPGA core, and 2.5V ADC reference under variable 24V DC bus conditions with ESD and surge exposure. IC Role / Device Role / Timing Role: Triple-output regulator with coordinated PG assertion and thermal protection for safe system boot and fault recovery. Use Value: Single PG pin simplifies FPGA configuration sequencing; thermal shutdown prevents field failures during enclosure overheating events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3667EUDD#TRPBF | Same silicon, 24-pin 3mm×5mm QFN package with SYNC and UVLO1 pins - adds synchronization capability and precise undervoltage lockout. | Required where clock synchronization or tighter input voltage threshold control is needed; larger footprint but better thermal performance (θJA = 46°C/W). | Select for designs needing EMI reduction via clock sync or automotive-grade UVLO accuracy. |
| LT3667IMSE#TRPBF | Identical 16-pin MSOP package and pinout, but rated for –40°C to 125°C (same as LT3667EMSE#TRPBF) - no functional difference; only temperature grade labeling differs per packaging. | No application difference - both meet same operating temperature range; "I" grade denotes full characterization across –40°C to 125°C. | Select when full production-grade temperature validation documentation is required by OEM quality systems. |
Compared with LT3667EMSE#TRPBF, the LTC3667EUDD#TRPBF adds design flexibility through synchronization and precision UVLO, while the LT3667IMSE#TRPBF offers identical performance with formal industrial-grade qualification - enabling trade-offs between board space, thermal needs, and compliance requirements.
Availability
LT3667EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable instrumentation power, and industrial sensor hub applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3667EMSE#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, datasheets, and application notes for the LT3667 family.
The LT3667 product line delivers integrated triple-output power management for harsh-environment applications including automotive, industrial, and portable instrumentation - emphasizing fault tolerance, low IQ, and compact packaging.
FAQ
What is the maximum input voltage rating for LT3667EMSE#TRPBF?
The LT3667EMSE#TRPBF has an absolute maximum input voltage of 60V on the IN1 pin for nonrepetitive 1-second transients, with continuous operation rated up to 40V. The LDO inputs (IN2, IN3/BD) are fault-protected to ±45V, making LT3667EMSE#TRPBF suitable for automotive load-dump and industrial surge environments without external clamping.
How does the LT3667EMSE#TRPBF achieve low output ripple in Burst Mode?
The LT3667EMSE#TRPBF uses proprietary low-ripple Burst Mode operation that minimizes switching frequency and gate drive losses at light loads while maintaining tight output regulation. This results in <15mVP-P ripple in typical applications - critical for powering noise-sensitive analog circuits like precision ADCs and RF front-ends without additional filtering.
Can the LT3667EMSE#TRPBF's LDOs be disabled independently?
Yes - the LT3667EMSE#TRPBF allows independent enable/disable control of each LDO via the EN2/ILIM2 and EN3/ILIM3 pins. Pulling either pin above 1.2V disables its respective LDO while preserving buck regulator operation, enabling dynamic power rail management in multi-sleep-state systems.
What is the purpose of the DA pin on the LT3667EMSE#TRPBF?
The DA (Diode Anode) pin on the LT3667EMSE#TRPBF senses current through the external catch diode and triggers frequency foldback when valley current exceeds 500mA. This protects the output during short-circuit conditions by reducing switching frequency and average power dissipation - a key safety feature not found in basic buck controllers.
Does the LT3667EMSE#TRPBF require external compensation components?
No - the LT3667EMSE#TRPBF integrates all necessary compensation circuitry for both the buck regulator and LDOs. External components required are limited to the input/output capacitors, inductor, feedback resistors, BOOST capacitor, and optional current-limit programming resistors - simplifying design and reducing bill-of-materials count.
LT3667EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 243kHz ~ 2.2MHz
- Voltage/Current - Output 1:
- 1.2V ~ 38.6V, 400mA
- Voltage/Current - Output 2:
- 0.8V ~ 38.6V, 200mA
- Voltage/Current - Output 3:
- 0.8V ~ 38.6V, 200mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 1.6V ~ 45V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3667EMSE#TRPBF FAQ
1.How can I place an order for LT3667EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667EMSE#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 LT3667EMSE#TRPBF reliable?
The price and inventory of LT3667EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667EMSE#TRPBF?
LT3667EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667EMSE#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 LT3667EMSE#TRPBF?
For technical support, including LT3667EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3667EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667EMSE#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 LT3667EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667EMSE#TRPBF?
All LT3667EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667EMSE#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 LT3667EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3667EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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