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Analog Devices Inc. LT3667EUDD#TRPBF
- Part No.:
- LT3667EUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT3667EUDD#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
LT3667EUDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic triple-output power supply IC integrating a 400mA buck switching regulator and two 200mA fault-protected LDOs in a 24-pin 3mm × 5mm QFN 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 LT3667EUDD#TRPBF datasheet, LT3667EUDD#TRPBF pinout, LT3667EUDD#TRPBF application, or LT3667EUDD#TRPBF equivalent, key selection criteria include its dual fault-protected LDO architecture, ±45V fault tolerance on LDO inputs/outputs, 250kHz–2.2MHz adjustable switching frequency, thermal-enhanced QFN package with exposed GND pad, and integrated reverse-battery and reverse-current protection.
Technical Context
The LT3667EUDD#TRPBF implements current-mode control for fast transient response and stable loop behavior in its buck stage, while each LDO uses precision error amplifiers regulating FB2/FB3 to 0.8V with programmable current limits via external resistors tied to EN2/ILIM2 and EN3/ILIM3 pins. The IC integrates internal slope compensation, frequency foldback during overload, and independent power-good indicators (PG1/PG2/PG3) per output.
Burst Mode operation maintains high efficiency at light loads by reducing switching frequency and minimizing quiescent current to 50μA (12VIN → 5V/3.3V/2.5V no-load), while the boost capacitor (0.22μF) enables full switch saturation across the 4.3–40V input range. Fault protection includes ±45V absolute maximum ratings on LDO pins, reverse-battery protection, and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 400mA max; sufficient to drive mid-power microcontrollers or FPGAs without external pass devices. |
| LDO Output Current (each) | 200mA per LDO; supports analog sensors, ADCs, or low-power logic rails with tight load regulation. |
| Input Voltage Range (Buck) | 4.3V to 40V continuous, 60V max transient; compatible with 12V/24V automotive and industrial bus systems. |
| LDO Fault Protection | Fault protected to ±45V on IN2/OUT2 and IN3/OUT3; enables robust sensor interface in noisy or reverse-polarity environments. |
| Switching Frequency Range | 250kHz to 2.2MHz (adjustable via RT resistor); allows EMI optimization and small external component selection. |
| No-Load Quiescent Current | 50μA typical at 12VIN; extends battery life in always-on portable instrumentation. |
| Output Ripple (Burst Mode) | <15mVP-P typical; meets noise-sensitive analog circuit requirements without additional filtering. |
Pinout & Package
The LT3667EUDD#TRPBF is housed in a thermally-enhanced 24-lead (3mm × 5mm) plastic QFN package with exposed GND pad (Pin 25), requiring soldering to PCB for optimal thermal performance (θJA = 46°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (24) | Switch node | Connects to inductor, catch diode anode (DA), and boost capacitor; carries high dI/dt switching current. |
| BOOST (1) | Boost capacitor connection | Provides gate drive voltage > VIN to internal NPN switch; requires 0.22μF ceramic capacitor to SW. |
| EN (3) | Enable input | Logic-level shutdown control; ≥1V enables all regulators, ≤0.3V disables with 0.6–2μA input current. |
| RT (4) | Oscillator frequency set | Resistor to GND sets switching frequency from 250kHz to 2.2MHz; determines minimum on/off times. |
| BD (5) | Boost diode anode / bias source | Connects to internal Schottky anode; supplies internal regulator when >3.2V, improving efficiency. |
| OUT3 (7), OUT2 (14) | LDO outputs | Each delivers up to 200mA; require ≥2.2μF ceramic output capacitors for stability. |
| FB3 (8), FB2 (13) | LDO feedback | Regulated to 0.8V; resistor dividers set output voltage (e.g., 5V = Rtop/Rbot = 5.25k/1k). |
| FB1 (10) | Buck feedback | Regulated to 1.2V; defines buck output voltage (e.g., 5V = Rtop/Rbot = 3.32k/1k). |
| PG1 (9), PG2 (11), PG3 (12) | Per-rail power-good | Open-drain indicators assert high when respective FB pin is within ±10% of target voltage. |
| EN2/ILIM2 (16), EN3/ILIM3 (17) | LDO enable & current limit | Resistor to GND programs current limit (e.g., 31.6k = 10mA, 1.54k = 197mA); >1.2V disables LDO. |
| IN1 (20), IN2 (15), IN3 (6) | Power inputs | IN1 powers buck stage (4.3–40V); IN2/IN3 power LDOs (1.6–45V), fault-rated to ±45V. |
| UVLO1 (19) | Programmable undervoltage lockout | 1V threshold pin; enables precise input brownout detection independent of LDO operation. |
| GND (25) | Power and signal ground | Exposed pad must be soldered to PCB plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution replaces three discrete regulators, reducing BOM count and PCB area in space-constrained designs. |
| Fault-protected LDOs | ±45V absolute max rating on LDO inputs/outputs enables direct connection to unregulated vehicle batteries or industrial field wiring. |
| Low-noise Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving 50μA no-load IQ-critical for battery-powered instrumentation. |
| Programmable current limiting | External resistors on EN2/ILIM2 and EN3/ILIM3 pins allow precise, temperature-stable current limits (9.5–230mA) per LDO. |
| Independent power-good signals | Dedicated PG1/PG2/PG3 open-drain outputs simplify system sequencing and fault diagnostics in multi-rail applications. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powering infotainment head units and ADAS camera modules from 12V vehicle battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary triple-output PMIC providing 5V MCU core, 3.3V I/O, and 2.5V ADC reference with ±45V fault tolerance on all LDO pins. Use Value: Eliminates need for external TVS and reverse-polarity protection, reducing bill-of-materials and board space while meeting ISO 7637-2 pulse 5a/b requirements. | Use Scenario: Powering isolated pressure, temperature, and current sensors in factory automation PLCs exposed to 24V DC field wiring. IC Role / Device Role / Timing Role: Fault-protected LDO pair (OUT2/OUT3) supplies clean 3.3V/5V to analog front-ends, while buck (OUT1) powers digital interface logic. Use Value: ±45V LDO input/output rating withstands wiring faults and ESD events common in industrial environments without external clamping. |
| Portable Instrumentation | Medical Diagnostic Equipment |
Use Scenario: Battery-powered handheld multimeters and oscilloscopes requiring ultra-low standby current and low-noise analog rails. IC Role / Device Role / Timing Role: Buck regulator powers main processor; LDOs deliver quiet 3.3V/2.5V to precision ADCs and op-amps with <15mVP-P ripple. Use Value: 50μA no-load IQ extends battery runtime; Burst Mode ensures consistent low-noise performance across load range without manual mode switching. | Use Scenario: Point-of-care ultrasound and ECG monitors needing reliable, low-noise power for analog signal chains and FPGA-based processing. IC Role / Device Role / Timing Role: Triple-output regulator provides isolated 5V (digital), 3.3V (interface), and 1.8V (core) rails with independent power-good monitoring for safety-critical sequencing. Use Value: Per-rail PG signals enable real-time health monitoring and automatic shutdown on single-rail failure, supporting IEC 62304 Class C compliance. |
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 functionality but in 16-lead MSOP package; higher θJA (40°C/W) and no SYNC or UVLO1 pins. | Suitable for lower-power or cost-sensitive designs where thermal budget allows and synchronization is unnecessary. | Select when board space permits larger MSOP and thermal design accommodates 40°C/W junction-to-ambient. |
| LT3668EUDD#TRPBF | Enhanced version with 600mA buck output, extended 4.5–60V input, and improved LDO dropout (280mV @ 200mA). | Required for higher-current applications (e.g., powering SoCs) or wider input ranges including 48V industrial buses. | Choose when >400mA buck current or >40V input capability is needed; not drop-in due to different pinout and biasing. |
Compared with LT3667EMSE#TRPBF, the LT3667EUDD#TRPBF offers superior thermal performance (46°C/W vs 40°C/W), SYNC capability for EMI reduction, and UVLO1 for precise brownout detection-making it preferred for compact, noise-sensitive, or high-reliability designs. Versus LT3668EUDD#TRPBF, it trades higher buck current and input range for lower cost and identical footprint compatibility.
Availability
LT3667EUDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supplies, and portable instrumentation requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for LT3667EUDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision, industrial, and automotive applications.
The LT3667 product line delivers integrated triple-output power solutions targeting space-constrained, high-reliability systems requiring fault-tolerant LDOs and efficient buck conversion from wide-input industrial or automotive sources.
FAQ
What is the maximum input voltage rating for the LT3667EUDD#TRPBF buck regulator?
The LT3667EUDD#TRPBF buck regulator supports continuous operation from 4.3V to 40V on the IN1 pin, with an absolute maximum rating of 60V for nonrepetitive 1-second transients. This makes the LT3667EUDD#TRPBF suitable for 12V and 24V automotive and industrial systems subject to load dump and cold-crank conditions.
How does the LT3667EUDD#TRPBF achieve fault protection on its LDO outputs?
The LT3667EUDD#TRPBF provides ±45V absolute maximum ratings on both IN2/OUT2 and IN3/OUT3 pins, enabling direct connection to unregulated field wiring or vehicle batteries without external protection components. This fault tolerance is implemented through internal clamp structures and reverse-current blocking, verified across the full –40°C to +125°C operating range for the LT3667EUDD#TRPBF.
Can the LT3667EUDD#TRPBF operate in Burst Mode at all output load levels?
Yes-the LT3667EUDD#TRPBF automatically enters low-ripple Burst Mode operation at light loads to maintain high efficiency and low output ripple (<15mVP-P). As load increases, it transitions seamlessly to continuous conduction mode. This behavior is inherent to the LT3667EUDD#TRPBF's control architecture and requires no external configuration.
What is the purpose of the BD pin on the LT3667EUDD#TRPBF?
The BD pin on the LT3667EUDD#TRPBF connects to the anode of the internal boost diode and serves as an auxiliary bias source. When BD voltage exceeds 3.2V, the LT3667EUDD#TRPBF draws internal regulator current from BD instead of IN1, improving overall efficiency-particularly useful when powering the LT3667EUDD#TRPBF from a pre-regulated rail.
How do I program the current limit for LDO2 on the LT3667EUDD#TRPBF?
To program the current limit for LDO2 on the LT3667EUDD#TRPBF, connect a resistor between the EN2/ILIM2 pin and GND. For example, a 31.6kΩ resistor sets a 10mA limit, while a 1.54kΩ resistor sets 197mA. A 47nF capacitor must be placed in parallel with each resistor to ensure stability, as specified in the LT3667EUDD#TRPBF datasheet.
LT3667EUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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:
- 24-QFN (3x5)
LT3667EUDD#TRPBF FAQ
1.How can I place an order for LT3667EUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667EUDD#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 LT3667EUDD#TRPBF reliable?
The price and inventory of LT3667EUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667EUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667EUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667EUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667EUDD#TRPBF?
LT3667EUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667EUDD#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 LT3667EUDD#TRPBF?
For technical support, including LT3667EUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667EUDD#TRPBF requirements.
6.How does Aetrix verify that LT3667EUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667EUDD#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 LT3667EUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667EUDD#TRPBF?
All LT3667EUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667EUDD#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 LT3667EUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3667EUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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