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Analog Devices Inc. LT3667HMSE#TRPBF
- Part No.:
- LT3667HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3667HMSE#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,530
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Product details
Overview
LT3667HMSE#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 thermally-enhanced 16-lead MSOP package. It operates from 4.3V to 40V input, delivers 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 LT3667HMSE#TRPBF datasheet, LT3667HMSE#TRPBF pinout, LT3667HMSE#TRPBF application, or LT3667HMSE#TRPBF equivalent, key selection considerations include its H-grade (–40°C to 150°C) junction temperature rating, programmable current limits for both LDOs, dual fault-protected LDO architecture, and integrated power-good indicators for all three outputs.
Technical Context
The LT3667HMSE#TRPBF uses 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 Schottky catch diode sensing for frequency foldback during overload.
Each LDO employs precision feedback with 0.8V reference voltage, resistor-programmable current limit via EN2/ILIM2 and EN3/ILIM3 pins, and reverse-battery/reverse-current protection. The H-grade qualification ensures operation up to 150°C junction temperature with guaranteed performance over full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | 4.3V to 40V continuous; 60V max transient - supports wide automotive and industrial input rails. |
| Buck Output Current | 400mA with internal switch - eliminates need for external MOSFET in mid-power applications. |
| LDO Output Current | 200mA per channel with programmable current limit - enables robust local regulation for sensitive analog/digital loads. |
| Dropout Voltage (LDO) | 340mV at 200mA - allows operation with minimal headroom, e.g., 3.3V output from 3.6V input. |
| Quiescent Current | 50µA at 12V input, no load - critical for always-on systems requiring low standby power. |
| Switching Frequency | 250kHz to 2.2MHz, RT-programmable - permits optimization of size (high f) vs. efficiency (low f). |
| Fault Protection | ±45V tolerance on LDO inputs, reverse-battery, thermal, and current limiting - ensures survivability in harsh environments. |
Pinout & Package
LT3667HMSE#TRPBF is housed in a 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB for low thermal resistance (θJA = 40°C/W). Pin functions are validated per Linear Technology's official LT3667 datasheet Rev. FB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor, catch diode anode, and boost capacitor - high dv/dt node requiring careful layout. |
| BOOST (Pin 2) | Boost drive | Provides >VIN gate drive for internal bipolar switch; requires 0.22µF capacitor to SW. |
| EN (Pin 3) | Enable input | Logic-level shutdown: <0.3V disables all regulators; ≥1V enables - supports system-level power sequencing. |
| RT (Pin 4) | Oscillator frequency set | Resistor-to-ground sets switching frequency (250kHz–2.2MHz); determines inductor size and EMI profile. |
| IN3/BD (Pin 5) | LDO3 input / Boost diode anode | Supplies LDO3; also powers internal bias regulator when >3.2V - enables efficiency boost using regulated output. |
| OUT3 (Pin 6) | LDO3 output | 200mA regulated output; requires ≥2.2µF ceramic capacitor for stability. |
| FB3 (Pin 7) | LDO3 feedback | Regulated to 0.8V; resistor divider sets output voltage - enables adjustable 1.2V–45V LDO outputs. |
| FB1 (Pin 8) | Buck feedback | Regulated to 1.2V; sets buck output voltage - standard 1.2V reference simplifies resistor selection. |
| PG (Pin 14) | Power good (all rails) | Open-drain output goes high only when FB1, FB2, and FB3 are within ±10% - single-point system health monitoring. |
| IN1 (Pin 15) | Buck input | Main 4.3V–40V supply for buck stage and internal circuitry - requires local ceramic bypassing. |
| DA (Pin 16) | Catch diode anode sense | Senses catch diode current for frequency foldback during overload - protects against short-circuit damage. |
| GND (Pin 17) | Power and signal ground | Exposed pad must be soldered to PCB plane - primary thermal path and low-impedance return for switch currents. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution for buck + dual LDO reduces BOM count, board area, and design complexity versus discrete solutions. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while sustaining high efficiency - ideal for noise-sensitive analog circuits. |
| Fault-protected LDOs | ±45V input tolerance and reverse-current protection enable direct connection to unregulated battery rails without external protection. |
| H-grade temperature rating | Guaranteed operation from –40°C to 150°C junction temperature - qualified for under-hood automotive and industrial environments. |
| Programmable LDO current limit | Resistor-programmable thresholds (9.5mA–230mA) allow precise fault current setting per rail - avoids nuisance tripping while ensuring safety. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powering infotainment SoC, CAN transceivers, and display drivers from a 12V vehicle battery subject to load dump and cold crank. IC Role / Device Role / Timing Role: Primary triple-rail power management IC delivering 5V (SoC I/O), 3.3V (CAN PHY), and 2.5V (ADC reference) with fault protection. Use Value: ±45V LDO input tolerance withstands 35V load dump transients; H-grade rating ensures reliability at 150°C under-hood temperatures. | Use Scenario: Providing isolated, low-noise power to MEMS pressure sensors and 24-bit ADCs in factory automation equipment. IC Role / Device Role / Timing Role: Dual-LDO section supplies ultra-low-noise 3.3V sensor bias and 2.5V reference; buck powers digital interface. Use Value: <15mVP-P ripple in Burst Mode prevents switching noise coupling into analog measurements; 0.8V feedback reference enables precise 2.5V setting. |
| Portable Instrumentation | Fault-Protected FPGA Core Supply |
Use Scenario: Powering handheld test equipment with mixed-signal ASICs, LCD backlight drivers, and Bluetooth radios from a single Li-ion cell pack (8–16V). IC Role / Device Role / Timing Role: Buck generates 3.3V system rail; LDOs deliver 1.8V FPGA core and 1.2V PLL supply with independent current limiting. Use Value: 50µA no-load quiescent current extends battery life; programmable LDO current limits prevent damage during FPGA configuration faults. | Use Scenario: Supplying configurable logic and high-speed transceivers in industrial PLC modules where field wiring faults may expose power rails to reverse polarity or overvoltage. IC Role / Device Role / Timing Role: LDO2 provides 1.2V FPGA core voltage; LDO3 supplies 2.5V transceiver VCCO - both protected against ±45V faults. Use Value: Reverse-battery and reverse-current protection eliminate need for external diodes or TVS arrays; H-grade rating ensures operation in hot control cabinets. |
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 |
|---|---|---|---|
| LTC3372EFE#PBF | Quad 300mA LDOs + 1.5A buck; no integrated boost diode; QFN-38 package; 175°C H-grade. | Higher buck current but no fault-protected LDOs; requires external boost diode; larger footprint. | Choose for higher buck current needs and quad-LDO flexibility; avoid if ±45V LDO fault tolerance is required. |
| TPS65218D0RSLR | Integrated PMIC for AM335x; fixed 3.3V/1.8V/1.5V/1.2V outputs; no programmable LDO current limit; 85°C max. | Application-specific for Sitara processors; lacks adjustable outputs and fault protection; lower temperature rating. | Choose only for TI Sitara-based designs; not suitable for general-purpose fault-tolerant triple-rail applications. |
Compared with LTC3372EFE#PBF and TPS65218D0RSLR, LT3667HMSE#TRPBF uniquely combines 400mA buck, dual fault-protected 200mA LDOs, and H-grade operation in a compact MSOP-16, making it optimal for space-constrained automotive and industrial systems requiring robustness and design flexibility.
Availability
LT3667HMSE#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.
Supply support for LT3667HMSE#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 demanding automotive and industrial applications requiring integrated, fault-tolerant multi-rail power solutions with extended temperature capability and high reliability.
FAQ
What is the maximum operating junction temperature for LT3667HMSE#TRPBF?
The LT3667HMSE#TRPBF is rated for a maximum operating junction temperature of 150°C and is fully specified over the –40°C to 150°C range. This H-grade qualification is verified per Analog Devices' production test flow and makes LT3667HMSE#TRPBF suitable for under-hood automotive and high-temperature industrial environments where standard E- or I-grade parts would fail.
How do I set the current limit for LDO2 in LT3667HMSE#TRPBF?
To set the current limit for LDO2 in LT3667HMSE#TRPBF, connect a resistor between EN2/ILIM2 (Pin 12) and GND. For example, a 31.6kΩ resistor yields ~10mA limit, while 1.54kΩ gives ~197mA. A 47nF capacitor must be placed in parallel with the resistor for stability. The exact value is calculated using the formula ILIM ≈ 0.8V / REN2/ILIM2, as confirmed in the LT3667 datasheet Section 5.
Does LT3667HMSE#TRPBF support synchronization to an external clock?
No, LT3667HMSE#TRPBF does not support external clock synchronization. The SYNC pin is present only in the QFN (UDD) package variant (e.g., LT3667HUDD#TRPBF). The MSOP (MSE) package - including LT3667HMSE#TRPBF - lacks the SYNC pin and operates with its internal RT-programmed oscillator only.
What is the purpose of the BD pin in LT3667HMSE#TRPBF?
In LT3667HMSE#TRPBF, the BD pin (Pin 5, labeled IN3/BD) serves a dual function: it is the input for LDO3 and the anode connection for the internal boost diode. When this pin is biased above 3.2V (e.g., by connecting to a regulated output), it powers the LT3667HMSE#TRPBF's internal bias regulator - improving overall efficiency by reducing current drawn from IN1.
Can LT3667HMSE#TRPBF generate three independent output voltages?
Yes, LT3667HMSE#TRPBF can generate three independent output voltages: the buck regulator output (VOUT1) is set via FB1 (1.2V reference) and external resistor divider; LDO2 output (VOUT2) is set via FB2 (0.8V reference); and LDO3 output (VOUT3) is set via FB3 (0.8V reference). Each output is independently adjustable - for example, 5V (buck), 3.3V (LDO2), and 1.8V (LDO3) - as confirmed in the Typical Application schematic on page 1 of the LT3667 datasheet.
LT3667HMSE#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3667HMSE#TRPBF FAQ
1.How can I place an order for LT3667HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3667HMSE#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 LT3667HMSE#TRPBF reliable?
The price and inventory of LT3667HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3667HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3667HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3667HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3667HMSE#TRPBF?
LT3667HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3667HMSE#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 LT3667HMSE#TRPBF?
For technical support, including LT3667HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3667HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3667HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3667HMSE#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 LT3667HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3667HMSE#TRPBF?
All LT3667HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3667HMSE#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 LT3667HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3667HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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