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Analog Devices Inc. LTC3646EMSE-1#TRPBF
- Part No.:
- LTC3646EMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3646EMSE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,985
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Product details
Overview
LTC3646EMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is a 40V input, 1A synchronous step-down DC/DC converter in a thermally enhanced 16-lead MSOP package, featuring ±1% reference accuracy, 0.6V feedback voltage, and programmable 200kHz–3MHz switching frequency. It delivers regulated output from 0.6V to 15V and supports Burst Mode® operation for ultra-low 140µA no-load quiescent current-ideal for automotive intermediate bus supplies and industrial point-of-load systems requiring high efficiency across wide load ranges.
For engineers reviewing the LTC3646EMSE-1#TRPBF datasheet, LTC3646EMSE-1#TRPBF pinout, LTC3646EMSE-1#TRPBF application, or LTC3646EMSE-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed output voltage range (0.6V–15V), real-world efficiency curves, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LTC3646EMSE-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 tON = VON/(VIN × fO) enables stable regulation across large step-down ratios without output overvoltage risk-even at 40V input down to 0.6V output.
It integrates soft-start (250–500µs), PGOOD monitoring with ±7.5% threshold window and 15–30µs filtering, and dual protection: SVIN/PVIN overvoltage lockout (43.5V rising, 2.5V hysteresis) and short-circuit current limiting (0.9–1.5A valley limit). MODE/SYNC pin selects between Burst Mode® (140µA IQ) and forced continuous mode (ripple-sensitive applications).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 40V - supports 12V/24V/36V automotive and industrial rails without pre-regulation. |
| Output Voltage Range | 0.6V to 15V - fixed by external resistor divider; enables core logic, FPGA I/O, and analog supply generation. |
| Max Output Current | 1A - guaranteed across –40°C to +85°C junction temperature with proper thermal layout. |
| Feedback Reference | 0.6V ±1% - enables precise low-VOUT regulation; line/load regulation ≤0.12% ensures stability under dynamic loads. |
| Switching Frequency | 200kHz to 3.0MHz - set via RT resistor or synchronized externally; 2.25MHz default when RT = INTVCC. |
| No-Load Quiescent Current | 140µA typical in Burst Mode® - extends battery life in always-on systems like telematics and sensor nodes. |
| Package | 16-Lead Plastic MSOP with exposed PGND pad - θJA = 38°C/W; requires soldered thermal pad for rated performance. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE), 4mm × 3mm, exposed thermal pad (Pin 17 = PGND). Requires soldered exposed pad for thermal and electrical integrity per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Analog Ground Reference | Low-noise return for feedback and error amplifier; must be isolated from noisy power ground until joined at single point. |
| VFB (Pin 2) | Feedback Input | Connects to resistor divider; compares output to 0.6V reference; ±20nA input bias minimizes divider error. |
| ITH (Pin 3) | Error Amplifier Output | Compensation node; connects to RC network for loop stability; tied to INTVCC for internal compensation. |
| RT (Pin 4) | Oscillator Programming | Resistor to SGND sets frequency (200kHz–3MHz); floating prohibited; 450kΩ → 200kHz, 30kΩ → 3MHz. |
| VON (Pin 5) | On-Time Scaling Input | Connected to VOUT; enables constant-frequency operation across wide VIN/VOUT ratios via tON = VON/(VIN × fO). |
| PGOOD (Pin 6) | Power Good Indicator | Open-drain output pulled low if VFB deviates >7.5% from 0.6V; includes 15–30µs glitch filter. |
| MODE/SYNC (Pin 7) | Mode Control / Clock Sync | Ground = forced continuous; INTVCC = Burst Mode®; external clock = sync + forced continuous. |
| NC (Pin 8) | No Connect | Not internally bonded; leave unconnected and unpopulated on PCB. |
| SVIN (Pin 16) | Control Circuit Supply | Must match PVIN voltage; decouple with ≥1µF low-ESR capacitor to SGND for accurate on-time calculation. |
| RUN (Pin 15) | Enable Input | Active-high enable; threshold 1.17–1.26V rising; hysteresis 110mV prevents chatter during slow-rising supplies. |
| EXTVCC (Pin 14) | External Bias Input | Accepts 4.5–6.0V supply to power control circuitry; improves efficiency vs. internal INTVCC derivation. |
| INTVCC (Pin 13) | Internal 5.0V Regulator | 5.0V ±4% output; powers internal logic; decouple with ≥4.7µF low-ESR cap to PGND; disabled when RUN = low. |
| BOOST (Pin 12) | Bootstrap Supply | Drives high-side gate; requires ceramic capacitor (10–100nF) between BOOST and SW pins. |
| SW (Pin 11) | Switch Node | Connects to inductor and BOOST capacitor; handles full switching current and fast dV/dt transitions. |
| PVIN (Pins 9,10) | Main Power Input | High-current path to top FET; decouple with ≥10µF low-ESR capacitor directly to PGND. |
| PGND (Exposed Pad) | Power Ground Return | Thermal and electrical ground for both FETs; must be soldered to large PCB copper area for θJA = 38°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Patented Controlled On-Time Architecture | Enables stable 40V-to-0.6V conversion without output overvoltage risk, even with wide input transients. |
| Burst Mode® Operation | Reduces no-load IQ to 140µA while maintaining ±1% VOUT regulation-critical for battery-backed systems. |
| Integrated 200mΩ/120mΩ Power FETs | Eliminates external MOSFETs and drivers; reduces BOM count and layout complexity for compact designs. |
| Programmable Switching Frequency (200kHz–3MHz) | Allows optimization of inductor size (high-freq) vs. efficiency (low-freq); supports EMI spread-spectrum tuning. |
| Robust Protection Suite | Includes SVIN overvoltage lockout (43.5V), short-circuit current limit (1.2A typ), and thermal shutdown (TJ = 150°C). |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 1.2V FPGA core and 3.3V I/O banks in vehicle head units with 12V/24V battery input and cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1A at 1.2V with Burst Mode® for standby current <200µA. Use Value: Maintains regulation during 4.5V battery dips; 0.6V reference enables accurate low-VOUT setting; 40V rating withstands load-dump transients. |
Use Scenario: Generates isolated 5V and 15V rails for analog sensor front-ends and digital logic in factory-floor controllers. IC Role / Device Role / Timing Role: Intermediate bus converter stepping 24V industrial rail down to 15V for downstream LDOs and ADCs. Use Value: Wide 4–40V input accommodates 24V ±20% variation; ±1% reference ensures precision sensor excitation voltage stability. |
| Medical Portable Monitor | Telecom Remote Radio Unit |
|
Use Scenario: Supplies 3.3V microcontroller and 1.8V display driver in battery-powered patient monitors with multi-day runtime. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating in Burst Mode® during sleep cycles. Use Value: 140µA no-load IQ extends battery life; 16-pin MSOP fits space-constrained layouts; PGOOD confirms rail health before wake-up. |
Use Scenario: Provides 5V/1A bias for RF power amplifiers in outdoor small-cell base stations with wide ambient temperature range. IC Role / Device Role / Timing Role: Main DC/DC stage converting 48V backplane to 5V intermediate bus, operating in forced continuous mode. Use Value: 40V max input handles telecom surge standards; 1A output supports PA burst current; -40°C to +85°C rating ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V input, 3.5A output, 2.2MHz fixed freq, 2.5µA IQ in Silent Switcher® mode; no VON pin or adjustable on-time. | Superior EMI performance and higher current; lacks LTC3646EMSE-1#TRPBF's wide VOUT range (0.6–15V) and programmable frequency. | Select LT8610EMSE#TRPBF for noise-sensitive RF systems needing <10mVpp ripple; choose LTC3646EMSE-1#TRPBF for flexible VOUT tuning and cost-sensitive 1A designs. |
| TPS54202DRCT | 28V input, 2A output, 500kHz–2.5MHz sync'able, 2µA IQ; uses voltage-mode control, no integrated BOOT diode drive. | Lower max input voltage limits use in 36V+ automotive systems; different compensation structure requires redesign for stability. | Choose TPS54202DRCT for TI-ecosystem designs with existing 28V rails; retain LTC3646EMSE-1#TRPBF where 40V rating, ±1% reference, or Burst Mode® IQ is mandatory. |
Compared with LT8610EMSE#TRPBF and TPS54202DRCT, the LTC3646EMSE-1#TRPBF uniquely combines 40V input tolerance, 0.6V–15V output programmability, and 140µA Burst Mode® IQ in a thermally optimized MSOP-making it optimal for cost-constrained, wide-input industrial and automotive point-of-load applications where flexibility and low-light-load efficiency are prioritized over ultra-low EMI or >2A output.
Availability
LTC3646EMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC I/O modules, and medical portable monitors requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LTC3646EMSE-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 full product support, datasheets, and design tools for all Linear ICs including the LTC3646 family.
The LTC3646 series was designed for high-voltage, high-efficiency point-of-load conversion in automotive, industrial, and medical systems where wide input range, precise low-VOUT regulation, and ultra-low quiescent current are essential.
FAQ
What is the maximum input voltage rating for the LTC3646EMSE-1#TRPBF?
The LTC3646EMSE-1#TRPBF has an absolute maximum PVIN/SVIN rating of 45V, with guaranteed operation up to 40V. Its overvoltage lockout triggers at 43.5V (rising) with 2.5V hysteresis, protecting internal FETs during load-dump transients common in automotive 24V systems. This 40V operational ceiling makes LTC3646EMSE-1#TRPBF suitable for 12V, 24V, and 36V industrial rails without external clamping.
Does the LTC3646EMSE-1#TRPBF support output voltages below 1.0V?
Yes, the LTC3646EMSE-1#TRPBF supports output voltages as low as 0.6V due to its precise 0.6V ±1% internal reference and dedicated VON pin for on-time scaling. When configured with appropriate resistor dividers and external compensation, LTC3646EMSE-1#TRPBF reliably regulates 0.6V, 0.8V, and 1.0V outputs-enabling direct powering of modern low-voltage processors and FPGAs without post-regulation LDOs.
How does the Burst Mode® operation of the LTC3646EMSE-1#TRPBF reduce power consumption?
In Burst Mode®, the LTC3646EMSE-1#TRPBF disables both power FETs during light loads, reducing quiescent current to 140µA typical while maintaining output regulation. The controller wakes only when output droop triggers the error amplifier, delivering discrete energy packets to the output capacitor. This discontinuous conduction significantly lowers power loss in battery-powered or always-on systems-extending runtime in applications like telematics and portable diagnostics where LTC3646EMSE-1#TRPBF operates for hours in standby.
Can the LTC3646EMSE-1#TRPBF be synchronized to an external clock?
Yes, the LTC3646EMSE-1#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven with a clean CMOS clock signal between 200kHz and 3.0MHz, the device locks its switching frequency to the external source and operates in forced continuous mode. An RT resistor must still be connected to set internal oscillator gain-ensuring stable phase alignment. This capability allows LTC3646EMSE-1#TRPBF to avoid beat frequencies in multi-rail systems and meet strict EMI timing requirements.
What thermal considerations apply to the LTC3646EMSE-1#TRPBF in MSOP package?
The LTC3646EMSE-1#TRPBF in 16-lead MSOP has θJA = 38°C/W, achievable only when the exposed PGND pad (Pin 17) is fully soldered to a minimum 200mm² copper area on the PCB. Without proper thermal pad connection, junction temperature rise exceeds specifications, risking premature thermal shutdown or reduced lifetime. For 1A continuous operation at 40V input, a 4-layer board with internal ground planes and 2oz copper is recommended to maintain TJ < 125°C per LTC3646EMSE-1#TRPBF datasheet guidelines.
LTC3646EMSE-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
LTC3646EMSE-1#TRPBF FAQ
1.How can I place an order for LTC3646EMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3646EMSE-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 LTC3646EMSE-1#TRPBF reliable?
The price and inventory of LTC3646EMSE-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 LTC3646EMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3646EMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3646EMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3646EMSE-1#TRPBF?
LTC3646EMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3646EMSE-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 LTC3646EMSE-1#TRPBF?
For technical support, including LTC3646EMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3646EMSE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3646EMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3646EMSE-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 LTC3646EMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3646EMSE-1#TRPBF?
All LTC3646EMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3646EMSE-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 LTC3646EMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3646EMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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