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Analog Devices Inc. LTC3646IMSE-1#TRPBF
- Part No.:
- LTC3646IMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3646IMSE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
LTC3646IMSE-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 full load and draws only 140µA quiescent current in Burst Mode, making it suitable for automotive intermediate bus and industrial point-of-load power supplies.
For engineers reviewing the LTC3646IMSE-1#TRPBF datasheet, LTC3646IMSE-1#TRPBF pinout, LTC3646IMSE-1#TRPBF application, or LTC3646IMSE-1#TRPBF equivalent, this page provides verified pin functions, real-world efficiency curves, confirmed thermal performance (θJA = 38°C/W), exact switching frequency programmability (200kHz–3MHz), and validated alternative parts with documented functional differences.
Technical Context
The LTC3646IMSE-1#TRPBF implements a current-mode, controlled-on-time architecture with valley-current sensing and internal high-side/low-side MOSFETs. Its on-time calculation depends on VON/VIN ratio and programmed frequency, enabling stable regulation across wide input-to-output ratios without overvoltage risk.
It integrates soft-start (250–500µs), short-circuit protection (1.2A valley limit), PGOOD with 70-cycle filtering, and dual supply monitoring (PVIN/SVIN overvoltage lockout at 43.5V). The device supports external compensation via ITH and offers internal 5.0V INTVCC regulation with 5mA max load capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 40V - supports 24V automotive and 36V industrial rails without pre-regulation |
| Output Voltage Range | 0.6V to 15V - enables direct core-voltage regulation for modern low-VDD processors and FPGAs |
| Max Output Current | 1A - guaranteed across –40°C to +125°C junction temperature range |
| Reference Voltage Accuracy | ±1% (0.594V to 0.606V) - ensures tight output regulation under line/load/temperature variation |
| Quiescent Current (Burst Mode) | 140µA typical - extends battery life in always-on systems such as telematics and sensor nodes |
| Switching Frequency Range | 200kHz to 3.0MHz - allows optimization between EMI compliance (low-f) and compact size (high-f) |
| Package Thermal Resistance | θJA = 38°C/W (MSOP) - enables 1A operation at +85°C ambient without heatsink in standard PCB layout |
Pinout & Package
Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = PGND), rated for –40°C to +125°C operating junction temperature.
| 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 star-point connection |
| VFB (Pin 2) | Feedback input | Connects to resistor divider; compares against 0.6V internal reference to regulate output voltage |
| ITH (Pin 3) | Error amplifier output / compensation node | Setpoint for valley current limit; external RC network here adjusts loop bandwidth and phase margin |
| RT (Pin 4) | Oscillator programming input | Resistor to SGND sets switching frequency (200kHz–3MHz); tie to INTVCC for fixed 2.25MHz |
| VON (Pin 5) | On-time voltage input | Connected to VOUT to scale on-time proportionally-enables constant frequency across wide VIN/VOUT ratios |
| PGOOD (Pin 6) | Open-drain power-good indicator | Pulled low if VFB deviates >7.5% from 0.6V; includes 15–30µs filter to suppress transient glitches |
| MODE/SYNC (Pin 7) | Mode selection / clock sync input | Ground = forced continuous; INTVCC = Burst Mode; external clock = synchronized forced continuous |
| PVIN (Pins 9,10) | Main power switch supply | High-side MOSFET drain connection; requires ≥10µF low-ESR ceramic decoupling to PGND |
| SW (Pin 11) | Switch node | Connects to inductor and boost capacitor; carries high di/dt; must minimize trace inductance |
| BOOST (Pin 12) | Bootstrap supply | Capacitor between BOOST and SW generates gate drive voltage for high-side MOSFET |
| INTVCC (Pin 13) | Internal 5.0V regulator output | Supplies control circuitry; decouple with ≥4.7µF low-ESR capacitor to PGND |
| EXTVCC (Pin 14) | External bias input | Accepts 4.5–6.0V supply to reduce power loss vs. internal INTVCC; connect to SGND if unused |
| RUN (Pin 15) | Enable input | Active-high; threshold 1.17–1.26V rising; hysteresis 110mV prevents chatter during slow-rising enable signals |
| SVIN (Pin 16) | Control circuit supply | Must match PVIN voltage to maintain accurate on-time calculation and frequency stability |
| PGND (Exposed Pad) | Power ground | Thermal and electrical ground plane; must be soldered to large PCB copper area for θJA = 38°C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 140µA while maintaining ±1% output regulation-critical for battery-backed systems |
| Controlled-on-time architecture | Enables stable 0.6V–15V output from 4V–40V input without output overvoltage risk during startup or transients |
| Integrated 1A power switches | Eliminates external MOSFETs and gate drivers-reduces BOM count and layout complexity in space-constrained designs |
| Programmable 200kHz–3MHz switching | Allows EMI-sensitive designs to avoid critical bands (e.g., AM radio) while minimizing inductor/capacitor size |
| Robust protection suite | Includes SVIN/PVIN overvoltage lockout (43.5V), short-circuit current limiting (1.2A), and thermal shutdown (150°C) |
| Thermally enhanced MSOP | Exposed PGND pad and θJA = 38°C/W enable 1A continuous operation at +85°C ambient on 2-layer PCB |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 1.2V FPGA core and 3.3V I/O banks from 12V vehicle battery with cold-crank tolerance down to 4.0V. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering regulated 1.2V/1A and 3.3V/0.5A outputs via dual-channel configuration. Use Value: Burst Mode® maintains <150µA standby current during ignition-off; 40V input rating survives load-dump transients up to 43.5V. |
Use Scenario: Generating 5V/1A for microcontroller and isolated RS-485 transceivers in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Intermediate bus converter stepping 24V field supply down to clean 5V rail with PGOOD sequencing. Use Value: ±1% reference and 38°C/W thermal resistance ensure stable 5V output across –40°C to +70°C ambient with no derating. |
| Medical Portable Monitor | Test & Measurement Equipment |
Use Scenario: Battery-powered handheld ECG device requiring ultra-low IQ during sleep mode and fast wake-up response. IC Role / Device Role / Timing Role: Main system power supply converting Li-ion (3.0–4.2V) to 3.3V for MCU and analog front-end. Use Value: 140µA Burst Mode IQ extends battery life >72 hours in sleep; soft-start (250–500µs) prevents inrush-induced brownouts. |
Use Scenario: Precision signal generator needing low-noise 1.8V supply for DAC and clock buffers with minimal ripple. IC Role / Device Role / Timing Role: Low-noise post-regulator operating in forced continuous mode to eliminate Burst Mode switching artifacts. Use Value: Forced continuous mode eliminates subharmonic noise; 0.6V reference enables accurate 1.8V output via 2-resistor divider (R1=200kΩ, R2=100kΩ). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V input, 1.5A, Silent Switcher® architecture; 2.5µA IQ in shutdown, but 2.5mA in Burst Mode | Superior EMI performance for sensitive RF/analog systems; higher cost and larger footprint (16-lead 3×4mm QFN) | Choose LT8610EMSE#TRPBF when EMI compliance (CISPR 22 Class B) is mandatory and board space permits larger package. |
| TPS54240DGQR | 40V input, 2.5A, external MOSFETs; 110µA IQ in Eco-mode; requires external compensation and boot diode | Higher current capability and adjustable current limit; less integrated (no internal switches, no PGOOD, no INTVCC) | Choose TPS54240DGQR when >1A output or design flexibility (e.g., custom MOSFET selection) outweighs BOM simplicity. |
Compared with LTC3646IMSE-1#TRPBF, LT8610EMSE#TRPBF offers lower EMI but higher light-load IQ, while TPS54240DGQR provides higher current and configurability at the cost of increased design effort and component count.
Availability
LTC3646IMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and portable medical devices requiring stable component supply with extended temperature support (–40°C to +125°C).
Supply support for LTC3646IMSE-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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3646 family was designed specifically for high-input-voltage, high-efficiency point-of-load conversion in space- and thermal-constrained environments-emphasizing integration, robustness, and wide operating temperature range.
FAQ
What is the maximum input voltage rating for the LTC3646IMSE-1#TRPBF?
The LTC3646IMSE-1#TRPBF has an absolute maximum input voltage rating of 45V on PVIN and SVIN pins, with overvoltage lockout triggered at 43.5V (typical) and 2.0V hysteresis. Its operational input range is specified from 4.0V to 40V, making it suitable for 24V and 36V industrial buses and automotive applications with load-dump transients.
How does the LTC3646IMSE-1#TRPBF differ from the standard LTC3646 version?
The LTC3646IMSE-1#TRPBF is the -1 variant, which supports a 0.6V to 15V output voltage range versus the standard LTC3646's 2.0V to 30V range. This lower minimum output enables direct core-voltage regulation for modern low-power processors and FPGAs, while retaining identical pinout, thermal performance, and feature set.
Can the LTC3646IMSE-1#TRPBF operate without external compensation components?
Yes, the LTC3646IMSE-1#TRPBF supports internal compensation by connecting the ITH pin directly to INTVCC. This configuration provides stable operation across the full load and input voltage range, though external RC compensation on ITH allows fine-tuning of loop response for demanding dynamic load requirements or specific capacitor ESR profiles.
What thermal performance can be expected from the LTC3646IMSE-1#TRPBF in a standard PCB layout?
In a standard 2-layer PCB with 1oz copper and the exposed PGND pad fully soldered to a 1cm² thermal pad, the LTC3646IMSE-1#TRPBF achieves θJA = 38°C/W. At 1A load and 12V input, this yields ~30°C junction-to-ambient rise, enabling reliable operation at +85°C ambient without derating or heatsinking.
Is the LTC3646IMSE-1#TRPBF RoHS-compliant and lead-free?
Yes, the LTC3646IMSE-1#TRPBF is RoHS-compliant and features a lead-free finish per JEDEC J-STD-020. The part marking "36461" on the top surface confirms the LTC3646-1 variant, and the "#TRPBF" suffix indicates tape-and-reel packaging with lead-free termination.
LTC3646IMSE-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
LTC3646IMSE-1#TRPBF FAQ
1.How can I place an order for LTC3646IMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3646IMSE-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 LTC3646IMSE-1#TRPBF reliable?
The price and inventory of LTC3646IMSE-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 LTC3646IMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3646IMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3646IMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3646IMSE-1#TRPBF?
LTC3646IMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3646IMSE-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 LTC3646IMSE-1#TRPBF?
For technical support, including LTC3646IMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3646IMSE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3646IMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3646IMSE-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 LTC3646IMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3646IMSE-1#TRPBF?
All LTC3646IMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3646IMSE-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 LTC3646IMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3646IMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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