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Analog Devices Inc. LTC3646HMSE-1#TRPBF
- Part No.:
- LTC3646HMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3646HMSE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
LTC3646HMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is a 40V input, 1A synchronous step-down DC/DC converter in thermally enhanced 16-lead MSOP package, featuring ±1% reference accuracy, 0.6V to 15V output voltage range (LTC3646-1 variant), and selectable Burst Mode® or forced continuous operation. It delivers up to 95% efficiency at 1A load with 140µA no-load quiescent current, suited for high-voltage point-of-load power in automotive and industrial control systems.
For engineers reviewing the LTC3646HMSE-1#TRPBF datasheet, LTC3646HMSE-1#TRPBF pinout, LTC3646HMSE-1#TRPBF application, or LTC3646HMSE-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance at 150°C junction, real-world efficiency curves across 4–40V input, and precise alternative selection guidance for high-reliability 1A buck conversion.
Technical Context
The LTC3646HMSE-1#TRPBF implements a current-mode, controlled-on-time architecture with valley-current sensing and internal 0.6V reference. Its on-time calculation tON = VON/(VIN × fO) enables stable regulation across wide input/output ratios without external compensation dependency.
It integrates dual MOSFETs (200mΩ high-side, 120mΩ low-side), supports external frequency programming (200kHz–3MHz) via RT resistor or synchronization via MODE/SYNC pin, and features robust protection including SVIN/PVIN overvoltage lockout (43.5V trip), short-circuit current limiting (0.9–1.5A), and thermal shutdown at 150°C junction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 40V - supports direct connection to 24V/36V industrial buses and automotive battery rails with transient tolerance up to 45V absolute max. |
| Output Voltage Range | 0.6V to 15V - enables generation of sub-1V core supplies (e.g., 0.8V FPGA I/O) and standard 3.3V/5V rails using single-resistor feedback divider. |
| Max Output Current | 1A continuous - guaranteed across full –40°C to +150°C junction temperature range with thermal derating per θJA = 38°C/W (MSOP). |
| Quiescent Current | 140µA typical in Burst Mode® at no load - sustains regulation while minimizing standby power in always-on systems like telematics or sensor nodes. |
| Reference Accuracy | ±1% over –40°C to +85°C - ensures tight output regulation without calibration, critical for ADC reference supplies and precision analog circuitry. |
| Switching Frequency | 200kHz to 3.0MHz - adjustable via RT resistor or external clock; higher frequencies enable <3.3µH inductors and <10µF ceramic output caps for space-constrained designs. |
| Package | 16-Lead Plastic MSOP with exposed PGND pad - provides 38°C/W thermal resistance and requires soldered exposed pad for rated power dissipation and EMI control. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE), 4mm × 3mm body, exposed thermal pad (Pin 17 = PGND). Requires soldered exposed pad for thermal and electrical integrity per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Analog Ground Reference | Low-noise return path for feedback and error amplifier; must be isolated from noisy PGND until joined at single-point star ground. |
| VFB (Pin 2) | Feedback Input | Connects to resistor divider from VOUT; compares against 0.6V internal reference to regulate output voltage with ±1% accuracy. |
| ITH (Pin 3) | Error Amplifier Output / Compensation Node | Loop compensation point; connect RC network for stability or tie to INTVCC for internal compensation. |
| RT (Pin 4) | Oscillator Programming Input | Resistor-to-ground sets switching frequency from 200kHz to 3MHz; tie to INTVCC for fixed 2.25MHz default. |
| VON (Pin 5) | On-Time Control Input | Connected to VOUT to scale on-time inversely with input voltage, enabling constant-frequency operation across wide VIN/VOUT ratios. |
| PGOOD (Pin 6) | Open-Drain Power Good Flag | Pulled low when VFB deviates >7.5% from 0.6V; includes 15–30µs filter to suppress transient-induced false trips. |
| MODE/SYNC (Pin 7) | Operating Mode Select / Clock Input | Tie to GND for forced continuous mode; to INTVCC for Burst Mode®; drive with external clock for synchronization. |
| PVIN (Pins 9,10) | Main Power Switch Supply | High-current input for top MOSFET; requires ≥10µF low-ESR ceramic capacitor directly to PGND. |
| SW (Pin 11) | Switch Node | Connects to inductor and boost capacitor; carries high di/dt square wave; must minimize trace inductance for EMI and efficiency. |
| BOOST (Pin 12) | Bootstrap Supply | Generates gate drive voltage for high-side MOSFET via SW–BOOST capacitor; swing ranges from INTVCC to PVIN + INTVCC. |
| INTVCC (Pin 13) | Internal 5.0V Regulator Output | Supplies internal logic; decouple with ≥4.7µF low-ESR cap to PGND; disabled when RUN = low. |
| EXTVCC (Pin 14) | External Bias Input | Accepts 4.5–6.0V supply to reduce quiescent current; leave unconnected or tie to SGND if unused. |
| RUN (Pin 15) | Enable Input | Active-high enable; threshold 1.17–1.26V rising; hysteresis 110mV; leakage <1µA allows high-impedance control. |
| SVIN (Pin 16) | Control Circuit Supply | Must match PVIN voltage to maintain accurate on-time calculation; decouple with >1µF low-ESR cap to SGND. |
| PGND (Exposed Pad) | Power Ground Return | Primary return path for high-current switch node; must be soldered to large PCB copper area for thermal conduction and low-impedance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Patented Controlled On-Time Architecture | Enables stable regulation across 4V–40V input with 0.6V–15V output without risk of overvoltage during startup or transients. |
| Integrated Dual Power MOSFETs | 200mΩ high-side + 120mΩ low-side switches eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Burst Mode® Operation | Reduces no-load IQ to 140µA while maintaining ±1% output regulation-ideal for battery-backed or energy-harvesting systems. |
| Robust Protection Suite | Includes SVIN/PVIN overvoltage lockout (43.5V), short-circuit current limit (1.2A typ), thermal shutdown (150°C), and PGOOD monitoring. |
| Thermally Enhanced MSOP Package | θJA = 38°C/W with soldered exposed pad enables 1A continuous operation at +125°C ambient in standard 2-layer PCBs. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 1.2V FPGA core and 3.3V interface rails in head-unit mainboard under 9–16V battery input with cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.2V/3.3V from unregulated vehicle battery with Burst Mode® for low-power sleep states. Use Value: Maintains regulation during 4V cold-crank events; 140µA quiescent current extends battery life in key-off mode; 150°C rating survives under-dash thermal environment. |
Use Scenario: Generating 5V/1A for digital I/O isolation and communication ICs in DIN-rail mounted programmable logic controller with 24V DC input. IC Role / Device Role / Timing Role: Point-of-load DC/DC converter providing clean, tightly regulated 5V rail with PGOOD signaling for system health monitoring. Use Value: ±1% reference accuracy ensures reliable logic-level margins; 40V abs-max rating withstands 36V industrial bus transients; MSOP thermal performance eliminates need for heatsink. |
| Medical Sensor Node Supply | Test Equipment Auxiliary Rail |
Use Scenario: Providing ultra-low-noise 3.3V supply for precision analog front-end (AFE) and low-power MCU in portable patient monitor with Li-ion battery input. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in Burst Mode® during sensor idle periods and forced continuous during data acquisition bursts. Use Value: 95% peak efficiency extends battery runtime; 140µA IQ minimizes standby drain; internal compensation simplifies layout for noise-sensitive analog sections. |
Use Scenario: Delivering stable 12V/1A auxiliary supply for DUT biasing in automated test equipment with 28V intermediate bus. IC Role / Device Role / Timing Role: Intermediate bus converter stepping 28V down to 12V with external synchronization to system clock for EMI reduction. Use Value: MODE/SYNC pin accepts 1MHz external clock to align switching edges and suppress beat frequencies; 3MHz max frequency enables compact 2.2µH inductor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRXMRQ1 | 4.5–65V input, 1A, 1.5MHz fixed freq, no Burst Mode®, requires external bootstrap diode. | Higher VIN range suits 48V telecom; lacks low-IQ sleep mode-unsuitable for battery-powered systems. | Choose for 65V transient immunity where 140µA IQ is not required. |
| MP2451DT-LF-Z | 4.5–36V input, 0.6A, 2MHz fixed freq, 250µA IQ, no PGOOD or sync capability. | Lower current and IQ; no thermal grade beyond 125°C; limited protection set (no OVLO). | Accept only for cost-sensitive, non-automotive 0.6A designs with relaxed thermal and protection requirements. |
Compared with LM5164QWRXMRQ1 and MP2451DT-LF-Z, the LTC3646HMSE-1#TRPBF uniquely combines 40V/1A capability, 140µA Burst Mode® IQ, ±1% reference, 150°C rating, and full feature set-including PGOOD, sync, and programmable frequency-in a single MSOP package optimized for high-reliability embedded power.
Availability
LTC3646HMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, medical sensor nodes, and test equipment auxiliary rails requiring stable component supply with extended temperature support and long-term lifecycle assurance.
Supply support for LTC3646HMSE-1#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3646 family was designed for high-input-voltage, high-efficiency point-of-load conversion in harsh environments-emphasizing thermal robustness, wide VIN/VOUT flexibility, and integrated protection for automotive, industrial, and medical applications.
FAQ
What is the maximum junction temperature rating for the LTC3646HMSE-1#TRPBF?
The LTC3646HMSE-1#TRPBF is specified for operation from –40°C to +150°C junction temperature and is fully guaranteed across this range. Its 16-lead MSOP package achieves θJA = 38°C/W when the exposed PGND pad is properly soldered to PCB copper, enabling 1A continuous output even at +125°C ambient in standard layouts. Thermal shutdown activates above 150°C to protect the device.
How does the LTC3646HMSE-1#TRPBF differ from the standard LTC3646 version?
The LTC3646HMSE-1#TRPBF is the -1 variant with 0.6V to 15V output voltage range (vs. 2.0V–30V for LTC3646), housed in a 16-lead MSOP package with H-grade (–40°C to +150°C) temperature rating. It shares identical pinout, protection features, and Burst Mode® operation with the base part but targets lower-output-voltage applications such as core supplies for modern processors and FPGAs.
Can the LTC3646HMSE-1#TRPBF operate without external compensation components?
Yes-the LTC3646HMSE-1#TRPBF supports internal compensation by connecting the ITH pin directly to INTVCC. This configuration eliminates external RC networks while maintaining stability across the full 0.6V–15V output range and 4V–40V input range, simplifying design for standard 3.3V/5V/12V rails where loop bandwidth optimization is not critical.
What is the purpose of the VON pin on the LTC3646HMSE-1#TRPBF?
The VON pin on the LTC3646HMSE-1#TRPBF feeds the output voltage into the on-time controller to dynamically adjust switching on-time based on VOUT/VIN ratio. When tied to VOUT, it enables constant-frequency operation across wide input/output combinations-preventing overvoltage during startup and ensuring predictable ripple behavior without external frequency compensation.
Does the LTC3646HMSE-1#TRPBF support external clock synchronization?
Yes-the MODE/SYNC pin on the LTC3646HMSE-1#TRPBF accepts an external clock signal from 200kHz to 3.0MHz to synchronize switching frequency. When driven externally, the device operates in forced continuous mode and adjusts its on-time to match the applied clock, reducing EMI through spectral concentration and enabling deterministic timing in multi-rail systems.
LTC3646HMSE-1#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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3646HMSE-1#TRPBF FAQ
1.How can I place an order for LTC3646HMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3646HMSE-1#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 LTC3646HMSE-1#TRPBF reliable?
The price and inventory of LTC3646HMSE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3646HMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3646HMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3646HMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3646HMSE-1#TRPBF?
LTC3646HMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3646HMSE-1#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 LTC3646HMSE-1#TRPBF?
For technical support, including LTC3646HMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3646HMSE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3646HMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3646HMSE-1#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 LTC3646HMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3646HMSE-1#TRPBF?
All LTC3646HMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3646HMSE-1#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 LTC3646HMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3646HMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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