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Analog Devices Inc. LT3667IUDD#TRPBF
- Part No.:
- LT3667IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT3667IUDD#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,747
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Product details
Overview
LT3667IUDD#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 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 ±45V fault protection on LDO inputs-ideal for automotive battery regulation and industrial sensor supplies.
For engineers reviewing the LT3667IUDD#TRPBF datasheet, LT3667IUDD#TRPBF pinout, LT3667IUDD#TRPBF application, or LT3667IUDD#TRPBF equivalent, key selection criteria include its triple-output architecture, programmable current-limited LDOs, 250kHz–2.2MHz adjustable switching frequency, thermal-enhanced QFN package with exposed GND pad, and integrated power-good indicators for all three rails.
Technical Context
The LT3667IUDD#TRPBF implements current-mode control in its buck stage for fast transient response and stable loop behavior across wide input/output conditions. Its dual LDOs feature resistor-programmable current limits (e.g., 9.5–230mA), accurate 0.8V feedback references, and guaranteed dropout voltage of 340mV at 200mA load.
Burst Mode operation maintains high efficiency at light loads while suppressing output ripple below 15mVP-P; synchronization capability (300kHz–2.2MHz) enables noise-sensitive system timing alignment. Internal reverse-battery, thermal, and reverse-current protection ensure robustness in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | 4.3V to 40V continuous; withstands 60V transients-supports wide automotive and industrial supply rails. |
| Buck Output Current | 400mA with internal switch-eliminates external MOSFET and reduces BOM count. |
| LDO Output Current | 200mA per LDO with programmable current limit-enables precise fault current setting for sensor or interface rails. |
| Switching Frequency | Adjustable 250kHz to 2.2MHz via RT resistor-allows optimization for size (high-freq) or efficiency (low-freq). |
| Quiescent Current | 50µA at no load (12VIN → 5V/3.3V/2.5V)-critical for always-on systems with battery backup. |
| Fault Protection | ±45V tolerance on LDO inputs-prevents damage during load dump or reverse-battery events. |
| Package | 24-pin 3mm × 5mm QFN with exposed GND pad-provides low θJA = 46°C/W for thermally demanding applications. |
Pinout & Package
The LT3667IUDD#TRPBF is housed in a thermally enhanced 24-pin plastic QFN (3mm × 5mm) with exposed GND pad (Pin 25), which must be soldered to PCB for optimal thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (24) | Switch node | Connects to inductor, catch diode anode, and boost capacitor-carries high-frequency switching current. |
| BOOST (1) | Boost drive | Provides gate drive voltage > VIN for internal NPN switch-requires 0.22µF capacitor to SW. |
| EN (3) | Enable input | Logic-level shutdown control: <0.3V disables all regulators; ≥1V enables full operation. |
| RT (4) | Oscillator frequency set | Resistor-to-GND sets switching frequency from 250kHz to 2.2MHz-determines inductor size and EMI profile. |
| BD (5) | Boost diode anode | Connects to internal Schottky anode and supplies bias current when >3.2V-improves efficiency by sourcing internal regulator. |
| OUT3 (7), OUT2 (14) | LDO outputs | Deliver up to 200mA each-require ≥2.2µF ceramic output capacitors for stability. |
| FB3 (8), FB2 (13), FB1 (10) | Feedback inputs | Regulated to 0.8V (LDOs) and 1.2V (buck)-set output voltages via external resistor dividers. |
| PG1 (9), PG2 (11), PG3 (12), PG (18) | Power-good indicators | Open-drain outputs signal regulation status within ±10%-enable sequencing and fault detection. |
| EN2/ILIM2 (16), EN3/ILIM3 (17) | LDO enable & current limit | Resistor-to-GND programs current limit (e.g., 31.6k = 10mA); >1.2V disables LDO. |
| GND (25) | Power and signal ground | Exposed pad-must be soldered to PCB plane for thermal dissipation and low-noise reference. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution replaces discrete buck + dual-LDO designs-reduces board area and component count by >40%. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving >85% efficiency-meets stringent analog and RF supply requirements. |
| Fault-protected LDO inputs | Withstands ±45V on IN2/IN3-enables direct connection to unregulated battery rails without external TVS or series FETs. |
| Programmable LDO current limit | Four precision current limit options (9.5mA–230mA) via single resistor-simplifies overcurrent protection design for diverse peripheral loads. |
| Thermally optimized QFN | θJA = 46°C/W with soldered exposed pad-supports 400mA buck + 2×200mA LDOs at ambient up to 85°C without heatsink. |
Applications
| Automotive Battery Regulation | Industrial Sensor Supply |
|---|---|
Use Scenario: Powering infotainment MCU, CAN transceiver, and display backlight from 12V vehicle battery with load dump and cold-crank resilience. IC Role / Device Role / Timing Role: Primary triple-rail PMIC delivering 5V (MCU core), 3.3V (CAN PHY), and 2.5V (ADC reference) with coordinated power-good signaling. Use Value: ±45V LDO fault tolerance eliminates need for external protection circuitry; 50µA quiescent current extends battery life in sleep mode. | Use Scenario: Providing isolated, low-noise power to pressure, temperature, and humidity sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Fault-protected LDO rail generator supplying 3.3V analog front-end and 5V digital interface, synchronized to system clock via SYNC pin. Use Value: 85dB ripple rejection at 120Hz suppresses line-frequency interference; programmable 10mA current limit prevents sensor damage during short-circuit faults. |
| Portable Instrumentation | Medical Diagnostic Equipment |
Use Scenario: Powering handheld multimeter with LCD, microcontroller, and precision ADC from single Li-ion cell (3.0–4.2V) boosted to 5V input rail. IC Role / Device Role / Timing Role: Buck regulator generates 5V main rail; LDOs provide clean 3.3V logic and 2.5V reference-each with independent enable and fault reporting. Use Value: Adjustable 250kHz–2.2MHz switching frequency allows use of ultra-small 2.2µH inductors; 0.34V dropout at 200mA ensures regulation down to low battery voltage. | Use Scenario: Supplying isolated analog signal chains in portable ultrasound probe with strict EMI and noise requirements. IC Role / Device Role / Timing Role: Triple-output regulator delivering 5V (transducer driver), 3.3V (FPGA I/O), and 1.8V (ADC core) with independent power-good monitoring. Use Value: <15mVP-P Burst Mode ripple meets medical-grade analog supply specs; 0.8V LDO feedback reference enables accurate low-voltage rail generation. |
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 |
|---|---|---|---|
| LTC3372HUFD#PBF | Octal 150mA LDOs with 4-channel buck controller; no integrated buck switch; requires external MOSFETs. | Targeted at highly configurable multi-rail systems with variable load profiles-not drop-in replacement for LT3667IUDD#TRPBF's integrated 400mA buck. | Select when fine-grained LDO count and independent enable control outweigh integrated switch convenience. |
| TPS65218D0RSLR | Integrated 3-buck + 4-LDO PMIC for AM335x processors; fixed 1.5V/1.8V/3.3V outputs; no programmable LDO current limit. | Optimized for TI Sitara SoCs; lacks ±45V fault tolerance and adjustable switching frequency-unsuitable for harsh industrial environments. | Choose only for TI processor reference designs where pin compatibility and software support are prioritized over ruggedness. |
Compared with LTC3372HUFD#PBF and TPS65218D0RSLR, the LT3667IUDD#TRPBF uniquely combines an integrated 400mA buck switch, dual programmable-current-limit LDOs, and ±45V fault protection in a compact QFN-making it optimal for space-constrained, high-reliability industrial and automotive power nodes requiring minimal external components.
Availability
LT3667IUDD#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 (–40°C to 125°C).
Supply support for LT3667IUDD#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.
The LT3667 product line was designed specifically for rugged triple-rail power conversion in automotive, industrial, and instrumentation applications-emphasizing fault tolerance, low quiescent current, and integration density.
FAQ
What is the maximum input voltage rating for the LT3667IUDD#TRPBF buck regulator?
The LT3667IUDD#TRPBF buck regulator supports a continuous input voltage range of 4.3V to 40V, with absolute maximum rating of 60V for nonrepetitive 1-second transients. This makes it suitable for 12V and 24V automotive systems experiencing load dump events. The LDO inputs tolerate ±45V, further enhancing system robustness beyond the buck input limits.
How does the LT3667IUDD#TRPBF achieve low output ripple in Burst Mode operation?
The LT3667IUDD#TRPBF uses proprietary low-ripple Burst Mode operation that maintains output ripple below 15mVP-P even at light loads by optimizing switching pulse width and frequency foldback. Unlike conventional burst modes, it minimizes energy per pulse and controls valley current to suppress both fundamental and harmonic content-critical for noise-sensitive analog and RF circuits powered by the LT3667IUDD#TRPBF.
Can the LT3667IUDD#TRPBF LDOs be disabled independently, and how is this accomplished?
Yes, the LT3667IUDD#TRPBF LDOs can be disabled independently using the EN2/ILIM2 (Pin 16) and EN3/ILIM3 (Pin 17) pins. Pulling either pin above 1.2V disables its respective LDO while preserving regulation on the other rails and the buck output. This enables dynamic power sequencing and selective rail shutdown-essential for low-power states in portable instrumentation and medical devices using the LT3667IUDD#TRPBF.
What is the purpose of the BD pin on the LT3667IUDD#TRPBF, and how should it be connected?
The BD (Boost Diode) pin (Pin 5) on the LT3667IUDD#TRPBF connects to the anode of the internal Schottky boost diode and serves as an auxiliary bias supply input. When driven above 3.2V (e.g., from a regulated LDO output), it powers the internal control circuitry, improving overall efficiency by reducing current draw from the main IN1 rail. For standard operation, connect BD to the cathode of the external boost diode and place a 0.22µF capacitor between BD and SW.
Does the LT3667IUDD#TRPBF support external clock synchronization, and what is the valid frequency range?
Yes, the LT3667IUDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 2) in QFN packages. It accepts TTL/CMOS-compatible clock signals from 300kHz to 2.2MHz, enabling EMI reduction through frequency dithering or alignment with system clocks. When not used, SYNC must be grounded to maintain low-ripple Burst Mode operation-ensuring predictable noise behavior in sensitive applications powered by the LT3667IUDD#TRPBF.
LT3667IUDD#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)
LT3667IUDD#TRPBF FAQ
1.How can I place an order for LT3667IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667IUDD#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 LT3667IUDD#TRPBF reliable?
The price and inventory of LT3667IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667IUDD#TRPBF?
LT3667IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667IUDD#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 LT3667IUDD#TRPBF?
For technical support, including LT3667IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667IUDD#TRPBF requirements.
6.How does Aetrix verify that LT3667IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667IUDD#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 LT3667IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667IUDD#TRPBF?
All LT3667IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667IUDD#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 LT3667IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3667IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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