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Analog Devices Inc. LT3667IMSE#TRPBF
- Part No.:
- LT3667IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3667IMSE#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
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Product details
Overview
LT3667IMSE#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 single 16-lead MSOP package. It operates from 4.3V–40V input, delivers regulated 5V/3.3V/2.5V outputs with <15mVP-P ripple in Burst Mode, and supports automotive battery regulation with ±45V fault protection on LDO inputs.
For engineers reviewing the LT3667IMSE#TRPBF datasheet, LT3667IMSE#TRPBF pinout, LT3667IMSE#TRPBF application, or LT3667IMSE#TRPBF equivalent, key selection criteria include its triple-output architecture with independent programmable current limits, thermal-enhanced MSOP-16 packaging, integrated reverse-battery and reverse-current protection, and compatibility with industrial sensor supplies requiring fault tolerance and low-noise biasing.
Technical Context
The LT3667IMSE#TRPBF implements current-mode control for fast transient response and stable loop behavior across wide input voltage ranges. Its buck stage features adjustable 250kHz–2.2MHz switching frequency via RT resistor and supports synchronization to external clocks between 300kHz–2.2MHz. The dual LDOs use precision 0.8V feedback references and integrate programmable current limiting via external resistors tied to EN2/ILIM2 and EN3/ILIM3 pins.
Fault protection includes reverse-battery protection on IN1, ±45V fault tolerance on LDO inputs (IN2/IN3), reverse-current blocking, thermal shutdown, and undervoltage lockout with 4.3V threshold on VIN1. Power Good (PG) asserts only when all three outputs-FB1, FB2, and FB3-are within ±10% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 400mA max with internal switch; enables compact single-inductor triple-rail supply design |
| LDO Output Current | 200mA per LDO (OUT2/OUT3); supports independent biasing of analog sensors and digital logic |
| Input Voltage Range | 4.3V–40V for buck (60V absolute max); 1.6V–45V for LDOs; suitable for 12V/24V automotive and industrial rails |
| Dropout Voltage | 340mV typical at 200mA load; ensures regulation under low headroom conditions like 3.3V-in → 2.5V-out |
| Quiescent Current | 50µA at 12VIN with no load on all outputs; critical for always-on battery-powered instrumentation |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT pin; allows EMI optimization and inductor size reduction |
| Output Ripple | <15mVP-P in Burst Mode; maintains low noise for sensitive analog circuitry without sacrificing light-load efficiency |
Pinout & Package
The LT3667IMSE#TRPBF is housed in a thermally-enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB ground for low θJA = 40°C/W. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor, catch diode anode (DA), and boost capacitor; carries high di/dt switching current |
| BOOST (Pin 2) | Bootstrap drive | Supplies gate drive voltage > VIN to internal NPN switch; requires 0.22µF capacitor to SW |
| EN (Pin 3) | Enable control | Logic-level shutdown: <0.3V disables all regulators; ≥1V enables operation with 1.1V threshold |
| RT (Pin 4) | Oscillator timing | Resistor-to-ground sets switching frequency (250kHz–2.2MHz); determines inductor size and EMI profile |
| IN3/BD (Pin 5) | LDO3 input / Boost diode anode | Accepts 1.6V–45V input for LDO3; also supplies bias current to internal regulator when >3.2V |
| OUT3 (Pin 6) | LDO3 output | Delivers up to 200mA; requires ≥2.2µF ceramic output capacitor for stability |
| FB3 (Pin 7) | LDO3 feedback | Regulated to 0.8V; connects to resistor divider to set VOUT3; enables precise output programming |
| FB1 (Pin 8) | Buck feedback | Regulated to 1.2V; sets main buck output voltage; high-impedance input (<20nA bias current) |
| EN2/ILIM2 (Pin 12) | LDO2 enable / current limit | Resistor-to-GND programs current limit (e.g., 31.6k = 10mA); >1.2V disables LDO2 |
| EN3/ILIM3 (Pin 13) | LDO3 enable / current limit | Same function as EN2/ILIM2 for LDO3; independent programming enables asymmetric fault thresholds |
| PG (Pin 14) | Power Good indicator | Open-drain output asserting high only when FB1, FB2, and FB3 are all within ±10% of target |
| IN1 (Pin 15) | Buck input | Primary 4.3V–40V input for buck stage; requires local 4.7µF bypass capacitor |
| DA (Pin 16) | Catch diode anode sense | Monitors catch diode current for foldback protection during overload or short-circuit events |
| GND (Pin 17) | Power and signal ground | Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution replaces discrete buck + dual-LDO designs, reducing BOM count and PCB area by >40% |
| Fault-protected LDO inputs | Withstands ±45V transients on IN2/IN3-enables direct connection to unregulated automotive battery rails |
| Programmable LDO current limits | External resistors set precise current thresholds (e.g., 9.5–230mA range), enabling tailored fault response per rail |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving 50µA quiescent current-ideal for always-on systems |
| Reverse-battery protection | Operates safely with –0.3V applied to IN1; prevents damage during battery installation errors in automotive applications |
| Thermally enhanced MSOP | Exposed-pad 16-lead MSOP achieves θJA = 40°C/W-supports 400mA buck operation without heatsink in 70°C ambient |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powering infotainment microcontroller, CAN transceiver, and display backlight from 12V vehicle battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: LT3667IMSE#TRPBF serves as primary triple-rail PMIC-buck generates 5V MCU core, LDO2 supplies 3.3V CAN interface, LDO3 delivers 2.5V ADC reference. Use Value: ±45V fault tolerance on LDO inputs eliminates need for external TVS diodes; PG pin coordinates system boot sequencing across all rails. | Use Scenario: Providing isolated, low-noise bias to MEMS pressure sensor, 24-bit sigma-delta ADC, and RS-485 transceiver in hazardous-area process transmitter. IC Role / Device Role / Timing Role: LT3667IMSE#TRPBF acts as fault-protected analog front-end power source-buck powers digital logic, LDO2 supplies 3.3V sensor excitation, LDO3 delivers ultra-low-noise 2.5V reference. Use Value: <15mVP-P ripple in Burst Mode ensures ADC SNR remains >105dB; programmable LDO current limits prevent latch-up during sensor cable faults. |
| Portable Instrumentation | Medical Diagnostic Equipment |
Use Scenario: Powering handheld multimeter with LCD, precision op-amps, and Bluetooth LE radio from two AA cells (2.4–3.2V) boosted to 5V input rail. IC Role / Device Role / Timing Role: LT3667IMSE#TRPBF functions as compact triple-output regulator-buck converts 5V to 3.3V MCU supply, LDO2 provides 2.5V analog reference, LDO3 delivers 1.8V RF section bias. Use Value: 50µA no-load IQ extends battery life to >12 months in sleep mode; MSOP-16 footprint fits sub-20mm² PCB area constraints. | Use Scenario: Supplying EEG amplifier stages, SAR ADC, and FPGA in portable ultrasound probe where EMI and leakage current must meet IEC 60601-1 2× MOPP requirements. IC Role / Device Role / Timing Role: LT3667IMSE#TRPBF delivers patient-isolated analog rails-buck powers digital subsystem, LDO2 supplies 3.3V amplifier bias, LDO3 provides 2.5V precision reference with 85dB ripple rejection. Use Value: Reverse-current protection blocks leakage paths between rails; 60–85dB input ripple rejection suppresses switching noise coupling into analog signal chains. |
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 |
|---|---|---|---|
| LT3667EMSE#TRPBF | Same silicon, rated for 0°C to 125°C junction temperature (vs. –40°C to 125°C for I-grade) | Suitable for commercial environments; not qualified for extended automotive or industrial temperature cycling | Select LT3667IMSE#TRPBF for designs requiring guaranteed operation at –40°C startup or sustained –40°C to 125°C operation. |
| LT3667HMSE#TRPBF | Same silicon, rated for –40°C to 150°C junction temperature with higher thermal derating thresholds | Required for under-hood automotive or high-ambient industrial applications exceeding 125°C case temperature | Choose LT3667HMSE#TRPBF when operating ambient exceeds 105°C or when extended lifetime reliability at high junction temperatures is mandated. |
Compared with LT3667EMSE#TRPBF and LT3667HMSE#TRPBF, the LT3667IMSE#TRPBF offers the optimal balance of extended temperature capability (–40°C to 125°C), production availability, and cost for industrial and automotive body electronics-without over-specifying for commercial use or under-specifying for high-temperature deployment.
Availability
LT3667IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supply, and portable instrumentation requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LT3667IMSE#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, manufacturing, and documentation for the LT3667 family. Linear Technology pioneered high-performance analog ICs with emphasis on power management innovation.
The LT3667 product line was designed specifically for fault-tolerant multi-rail power systems in harsh environments-targeting automotive, industrial, and medical applications where input transients, wide temperature operation, and rail independence are critical.
FAQ
What is the maximum input voltage rating for the LT3667IMSE#TRPBF buck regulator?
The LT3667IMSE#TRPBF buck regulator has a continuous operating input voltage range of 4.3V to 40V on the IN1 pin, with an absolute maximum rating of 60V for nonrepetitive 1-second transients. This allows robust operation in 24V industrial systems and 12V automotive applications subject to load dump events. Exceeding 40V continuously may trigger overvoltage lockout at 42V typical.
How does the LT3667IMSE#TRPBF achieve fault protection on its LDO inputs?
The LT3667IMSE#TRPBF provides ±45V fault tolerance on IN2 and IN3 pins through integrated protection circuitry that blocks reverse current and clamps transients without external components. This is implemented via internal bipolar structures and isolation techniques-not external TVS diodes-enabling direct connection to unregulated battery rails while maintaining LDO regulation during faults.
Can the LT3667IMSE#TRPBF operate with only the LDOs enabled and the buck regulator disabled?
Yes, the LT3667IMSE#TRPBF supports independent control: pulling EN low disables the buck regulator but leaves LDO2 and LDO3 operational if their respective EN2/ILIM2 and EN3/ILIM3 pins are held above 1.2V. Each LDO draws only 25µA quiescent current from its input when active and disabled, making this configuration viable for low-power backup biasing scenarios.
What is the minimum output capacitor requirement for stable operation of the LT3667IMSE#TRPBF LDOs?
The LT3667IMSE#TRPBF LDOs require a minimum 2.2µF ceramic output capacitor on each OUT2 and OUT3 pin for stability across all load and temperature conditions. Lower values risk oscillation, especially under dynamic load steps. X7R or X5R dielectrics with ≤100mΩ ESR are recommended; tantalum or aluminum electrolytics are not advised due to ESR and aging effects.
Does the LT3667IMSE#TRPBF support synchronization to an external clock source?
No-the LT3667IMSE#TRPBF is packaged in the MSOP-16 variant (denoted by "MSE" in the part number), which lacks the SYNC pin present only in the 24-pin QFN ("UDD") package. Therefore, LT3667IMSE#TRPBF supports only free-running operation with frequency set by the RT resistor, or low-ripple Burst Mode when SYNC is grounded (not applicable to MSOP).
LT3667IMSE#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
LT3667IMSE#TRPBF FAQ
1.How can I place an order for LT3667IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667IMSE#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 LT3667IMSE#TRPBF reliable?
The price and inventory of LT3667IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667IMSE#TRPBF?
LT3667IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667IMSE#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 LT3667IMSE#TRPBF?
For technical support, including LT3667IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3667IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667IMSE#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 LT3667IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667IMSE#TRPBF?
All LT3667IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667IMSE#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 LT3667IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3667IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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