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Analog Devices Inc. LT3667HUDD#TRPBF
- Part No.:
- LT3667HUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT3667HUDD#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,519
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Product details
Overview
LT3667HUDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic triple-output power management IC comprising a 400mA buck switching regulator and two 200mA fault-protected LDOs in a thermally enhanced 24-pin 3mm × 5mm QFN package. It operates from 4.3V to 40V input, delivers regulated outputs at 1.2V (buck), 0.8V (LDO2), and 0.8V (LDO3), and features ±45V fault protection on LDO inputs/outputs - ideal for automotive battery regulation and industrial sensor supplies.
For engineers reviewing the LT3667HUDD#TRPBF datasheet, LT3667HUDD#TRPBF pinout, LT3667HUDD#TRPBF application, or LT3667HUDD#TRPBF equivalent, key selection criteria include its triple-output architecture with independent enable/ILIM pins, guaranteed −40°C to +150°C junction temperature operation, low-ripple Burst Mode® operation (<15mVP-P), programmable current limits (9.5–197mA), and integrated power-good indicators (PG1/PG2/PG3) for system sequencing.
Technical Context
The LT3667HUDD#TRPBF implements current-mode control for fast transient response and stable loop behavior across wide input/output conditions. Its buck stage uses an internal bipolar NPN switch with integrated boost diode drive and external BOOST capacitor, while each LDO employs precision feedback (FB2/FB3 = 0.8V) and programmable current limiting via external resistors tied to EN2/ILIM2 and EN3/ILIM3 pins.
Thermal performance is optimized via exposed pad (Pin 25, GND) soldered to PCB, enabling θJA = 46°C/W in the UDD package. Fault protection includes reverse-battery protection, thermal shutdown, reverse-current blocking, and ±45V absolute maximum ratings on LDO I/O pins - critical for harsh-environment applications where input transients or miswiring may occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | 4.3V to 40V continuous; 60V max transient - supports 12V/24V/36V automotive and industrial rails. |
| Buck Output Current | 400mA with internal switch - eliminates need for external MOSFET in mid-power DC/DC designs. |
| LDO Output Current | 200mA per LDO (OUT2/OUT3) - sufficient for powering microcontrollers, ADCs, and sensors. |
| Feedback Reference (FB1) | 1.188V to 1.212V (±1%) - enables precise output voltage setting with minimal resistor tolerance impact. |
| Dropout Voltage (LDO @ 200mA) | 340mV typical - ensures regulation down to VIN = VOUT + 0.34V, critical for low-headroom systems. |
| Switching Frequency Range | 220kHz to 2.2MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq). |
| Operating Temperature | −40°C to +150°C junction - qualified for under-hood automotive and high-temp industrial use. |
Pinout & Package
The LT3667HUDD#TRPBF is housed in a 24-lead (3mm × 5mm) plastic QFN package with exposed thermal pad (Pin 25, GND). The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (24) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor - carries high di/dt switching current. |
| BOOST (1) | Boost capacitor connection | Provides gate drive voltage > VIN for internal NPN switch; requires 0.22µF ceramic capacitor to SW. |
| EN (3) | Global enable | Active-high logic input; ≥1.1V enables all regulators; <0.3V disables entire device (IQ = 0.01µA). |
| RT (4) | Oscillator frequency set | Resistor-to-GND sets switching frequency from 220kHz to 2.2MHz - enables EMI tuning and inductor size reduction. |
| BD (5) | Boost diode anode / bias supply | Connects to internal Schottky anode; supplies internal regulator when >3.2V - improves light-load 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 ±1%; resistor dividers set VOUT2/VOUT3 - enables adjustable LDO voltages. |
| FB1 (10) | Buck feedback | Regulated to 1.2V ±1%; resistor divider sets VOUT1 - supports fixed or adjustable buck output. |
| PG1 (9), PG2 (11), PG3 (12) | Individual power-good flags | Open-drain outputs indicating regulation status of buck (PG1), LDO2 (PG2), LDO3 (PG3) - enables sequenced startup. |
| PG (18) | Global power-good | Asserts only when all three outputs are within ±10% of target - simplifies system-level monitoring. |
| EN2/ILIM2 (16), EN3/ILIM3 (17) | LDO enable & current limit | Resistor-to-GND sets current limit (9.5–197mA); >1.2V disables LDO - provides dual-function pin for protection and control. |
| UVLO1 (19) | Precision undervoltage lockout | 1.0V ±5% threshold - enables accurate input rail monitoring independent of LDO operation. |
| GND (25) | Power and signal ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected LDO inputs/outputs | Rated for ±45V differential - prevents damage during reverse battery, load dump, or wiring faults. |
| Low-ripple Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while achieving 50µA no-load IQ - extends battery life without compromising noise. |
| Triple independent power-good signals | PG1, PG2, PG3 provide per-rail status - enables robust power sequencing in multi-rail systems like ADAS ECUs. |
| Programmable LDO current limit | External resistor sets 9.5–197mA limit with ±5% accuracy - replaces discrete current-limit circuits and saves board space. |
| Thermally enhanced QFN package | θJA = 46°C/W with exposed pad - sustains full 400mA buck + 2×200mA LDO output at +125°C ambient. |
Applications
| Automotive Battery Regulation | Industrial Sensor Supply |
|---|---|
Use Scenario: Powering engine control unit (ECU) sub-circuits from 12V battery with load dump transients up to 60V. IC Role / Device Role / Timing Role: Triple-output PMIC providing isolated 5V (buck), 3.3V (LDO2), and 2.5V (LDO3) rails with fault protection. Use Value: ±45V LDO I/O rating withstands reverse battery and load dump; UVLO1 enables precise brown-out detection. | Use Scenario: Supplying analog front-end (AFE), temperature sensor, and microcontroller in factory automation node. IC Role / Device Role / Timing Role: Single-chip solution delivering clean, sequenced 3.3V (buck), 1.8V (LDO2), and 1.2V (LDO3) from 24V industrial bus. Use Value: Low-noise LDOs (60–85dB ripple rejection) ensure ADC accuracy; PG flags enable safe MCU boot sequence. |
| Portable Instrumentation | Fault-Protected Data Acquisition |
Use Scenario: Powering handheld multimeter with LCD, op-amps, and SAR ADC from single Li-ion cell (3.0–4.2V) boosted to 5V. IC Role / Device Role / Timing Role: Buck regulator generates 5V main rail; LDOs provide low-noise 3.3V and 1.8V for precision analog stages. Use Value: 50µA no-load IQ extends battery runtime; programmable current limits protect against shorted sensor cables. | Use Scenario: Powering isolated data acquisition module in hazardous environment with potential for field-wiring faults. IC Role / Device Role / Timing Role: LDO2/LDO3 supply isolated ADC reference and digital isolator, while buck powers isolated DC/DC converter primary. Use Value: ±45V fault tolerance prevents latch-up during accidental 48V field wiring; reverse-current blocking avoids backfeed into failed channels. |
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 |
|---|---|---|---|
| LTC3375EFE#PBF | 8-channel configurable buck (up to 4A total), no integrated LDOs; requires external LDOs for linear rails. | Targets higher-current, digitally configurable systems; lacks fault-protected LDOs and ±45V rating. | Select when system needs scalable buck outputs and can add discrete LDOs with required fault protection. |
| TPS65218D0RSLR | Integrated 3 buck + 3 LDO PMIC; LDOs rated only to ±6V, no reverse-battery protection, max junction temp +125°C. | Suitable for consumer/portable apps; insufficient for automotive or industrial transients. | Select for cost-sensitive, non-harsh-environment applications where ±45V fault tolerance is not required. |
Compared with LTC3375EFE#PBF and TPS65218D0RSLR, the LT3667HUDD#TRPBF uniquely combines fault-protected LDOs, −40°C to +150°C operation, and integrated triple-output architecture - making it the only option qualified for automotive under-hood and high-reliability industrial sensor nodes requiring ±45V survivability.
Availability
LT3667HUDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor supply, and portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LT3667HUDD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3667HUDD#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for harsh-environment applications demanding fault tolerance, wide temperature operation, and integrated multi-rail power delivery.
FAQ
What is the maximum input voltage rating for the LT3667HUDD#TRPBF buck regulator?
The LT3667HUDD#TRPBF buck regulator supports 4.3V to 40V continuous input voltage, with an absolute maximum rating of 60V for nonrepetitive 1-second transients. This makes the LT3667HUDD#TRPBF suitable for 12V and 24V automotive systems subject to load dump events. Exceeding 40V continuously risks exceeding thermal limits or violating SOA specifications.
How does the LT3667HUDD#TRPBF achieve fault protection on its LDO inputs and outputs?
The LT3667HUDD#TRPBF achieves fault protection via internal circuitry that withstands ±45V differential voltage on IN2, IN3, OUT2, and OUT3 pins - verified per Absolute Maximum Ratings. This includes reverse-battery protection, reverse-current blocking, and thermal limiting. The LT3667HUDD#TRPBF does not require external TVS diodes for basic fault survival in automotive or industrial environments.
Can the LT3667HUDD#TRPBF operate with only the LDOs enabled and the buck regulator disabled?
Yes, the LT3667HUDD#TRPBF supports independent operation: pulling EN low disables the buck regulator and both LDOs, but tying EN high while grounding EN2/ILIM2 and EN3/ILIM3 disables only the LDOs. To run LDOs only, apply valid input to IN2 and IN3 (≥1.6V), keep EN high, and leave EN2/ILIM2 and EN3/ILIM3 unconnected or pulled to GND. The LT3667HUDD#TRPBF draws just 1µA quiescent current per enabled LDO in this configuration.
What is the purpose of the BD pin on the LT3667HUDD#TRPBF, and how should it be connected?
The BD pin on the LT3667HUDD#TRPBF connects to the anode of the internal boost diode and serves as an auxiliary bias supply input. When BD is held above 3.2V (e.g., tied to a regulated LDO output), the LT3667HUDD#TRPBF draws internal bias current from BD instead of IN1 - improving light-load efficiency. If unused, BD must be left floating or tied to IN3; it must never be driven below GND or above 30V.
Does the LT3667HUDD#TRPBF support synchronization to an external clock, and if so, which pin is used?
Yes, the LT3667HUDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 2, QFN package only). When SYNC is driven with a TTL/CMOS clock between 300kHz and 2.2MHz, the LT3667HUDD#TRPBF locks its internal oscillator to that frequency - reducing EMI by eliminating beat frequencies. Grounding SYNC enables low-ripple Burst Mode® operation at light loads.
LT3667HUDD#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LT3667HUDD#TRPBF FAQ
1.How can I place an order for LT3667HUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667HUDD#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 LT3667HUDD#TRPBF reliable?
The price and inventory of LT3667HUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667HUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667HUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667HUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667HUDD#TRPBF?
LT3667HUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667HUDD#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 LT3667HUDD#TRPBF?
For technical support, including LT3667HUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667HUDD#TRPBF requirements.
6.How does Aetrix verify that LT3667HUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667HUDD#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 LT3667HUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667HUDD#TRPBF?
All LT3667HUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667HUDD#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 LT3667HUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3667HUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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