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Analog Devices Inc. LTC3646IMSE#TRPBF
- Part No.:
- LTC3646IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3646IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,784
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Product details
Overview
LTC3646IMSE#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. It features a patented controlled on-time architecture, ±1% 0.6V reference, 140µA no-load quiescent current in Burst Mode, and adjustable switching frequency from 200kHz to 3.0MHz - enabling high-efficiency point-of-load regulation for automotive infotainment power rails.
For engineers reviewing the LTC3646IMSE#TRPBF datasheet, LTC3646IMSE#TRPBF pinout, LTC3646IMSE#TRPBF application, or LTC3646IMSE#TRPBF equivalent, key selection criteria include its 4.0V–40V input range, guaranteed 1A output, selectable Burst Mode vs forced continuous operation, internal power FETs, and compatibility with external clock synchronization for EMI-sensitive systems.
Technical Context
The LTC3646IMSE#TRPBF implements current-mode control with valley-current sensing and a programmable on-time controller that calculates tON = VON/(VIN × fO) to maintain constant frequency across wide input-output ratios. Its dual-input supply architecture separates PVIN (power switch rail) and SVIN (control circuitry rail), enabling robust overvoltage protection with independent 43.5V lockout on SVIN.
It integrates both high-side and synchronous low-side MOSFETs with 200mΩ/120mΩ RDS(ON) at 5.5V, supports internal or external compensation via the ITH node, and delivers PGOOD monitoring with 7.5% overvoltage and –5% undervoltage thresholds referenced to the 0.6V feedback comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 40V - supports direct connection to automotive battery (9V–16V) and industrial 24V/36V rails without pre-regulation. |
| Output Current | 1A guaranteed - sustains full load across temperature and line variations per datasheet min/max testing. |
| Reference Voltage | 0.6V ±1% - enables precise output setting from 2.0V to 30V (LTC3646 variant) with minimal resistor-divider error. |
| Quiescent Current | 140µA typical in Burst Mode - extends battery runtime in always-on automotive modules. |
| Switching Frequency | 200kHz–3.0MHz adjustable via RT resistor or external clock - allows optimization of size (high-f) vs efficiency (low-f). |
| Package | 16-Lead MSOP with exposed thermal pad - provides θJA = 38°C/W for reliable 1A operation without heatsink in compact layouts. |
| Protection Features | SVIN/PVIN overvoltage lockout (43.5V), short-circuit current limit (1.2A typ), and PGOOD with 30µs filter - ensures robustness in harsh environments. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE) with exposed PGND pad (Pin 17), rated for –40°C to +125°C operating junction temperature and θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Analog Ground Reference | Low-noise return path for feedback and error amplifier; must be separated from PGND at single-point star ground. |
| VFB (Pin 2) | Feedback Input | Connects to resistor divider; compares output voltage against 0.6V reference to regulate VOUT. |
| ITH (Pin 3) | Error Amplifier Output | Loop compensation node - connect RC network externally or tie to INTVCC for internal compensation. |
| RT (Pin 4) | Oscillator Programming | Resistor-to-ground sets switching frequency (200kHz–3MHz); tie to INTVCC for fixed 2.25MHz. |
| VON (Pin 5) | On-Time Control Input | Connected to VOUT to scale tON proportionally - enables stable operation at high step-down ratios. |
| PGOOD (Pin 6) | Power Good Output | Open-drain signal pulled low if VFB deviates >7.5% from 0.6V; includes 30µs glitch filter. |
| MODE/SYNC (Pin 7) | Operation Mode Control | Tie to INTVCC for Burst Mode, ground for forced continuous, or drive with external clock for sync. |
| PVIN (Pins 9,10) | High-Side Switch Supply | Direct connection to top FET drain; requires ≥10µF low-ESR ceramic decoupling to PGND. |
| SW (Pin 11) | Switch Node | Connects to inductor and boost capacitor; carries high dv/dt switching waveform. |
| BOOST (Pin 12) | Bootstrap Supply | Generated by SW–BOOST capacitor; supplies gate drive for high-side FET (INTVCC to PVIN+INTVCC swing). |
| INTVCC (Pin 13) | Internal 5.0V Regulator | Supplies control circuitry; requires ≥4.7µF low-ESR cap to PGND; disabled when RUN = low. |
| EXTVCC (Pin 14) | External Bias Input | Accepts 4.5V–6.0V supply to improve efficiency; tie to SGND if unused. |
| RUN (Pin 15) | Enable Input | Active-high enable with 1.21V threshold and 110mV hysteresis; supports sequencing and UVLO coordination. |
| SVIN (Pin 16) | Control Circuit Supply | Must match PVIN voltage to ensure accurate on-time calculation and stable frequency. |
| PGND (Exposed Pad) | Power Ground Return | Thermal and electrical ground for low-side FET and inductor; must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 140µA while maintaining ±1% VOUT regulation - critical for always-on automotive ECUs. |
| Controlled On-Time Architecture | Enables stable 2.0V–30V output from 40V input without risk of overvoltage during light loads or transients. |
| Integrated Power FETs | 200mΩ high-side + 120mΩ low-side MOSFETs eliminate external switches and reduce BOM count and layout complexity. |
| Programmable Frequency & Sync | RT resistor or external clock input allows EMI reduction via spread-spectrum or fixed-frequency alignment with system clocks. |
| Robust Protection Suite | Includes SVIN overvoltage lockout (43.5V), valley-current limiting (1.2A), and PGOOD with filtered fault reporting. |
| Thermally Enhanced MSOP | Exposed PGND pad and 38°C/W θJA support 1A continuous operation in space-constrained automotive modules. |
Applications
| Automotive Infotainment Core Rail | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Powers SoC cores and DDR memory in head-unit systems requiring stable 1.2V/3A (using parallel converters) with cold-crank tolerance down to 4.0V. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage; operates in Burst Mode during standby to meet ISO 16750-2 quiescent current requirements. Use Value: 140µA IQ and 40V max input withstand 12V battery transients up to 40V, eliminating need for upstream TVS or pre-regulator. |
Use Scenario: Generates isolated 5V/1A supply for digital I/O conditioning circuits in DIN-rail mounted controllers exposed to 24V industrial bus noise. IC Role / Device Role / Timing Role: Point-of-load regulator with PGOOD signaling to FPGA supervisor logic; uses forced continuous mode to minimize output ripple near sensitive ADC references. Use Value: ±1% reference and 0.6V FB enable precise 5.0V output; SVIN/PVIN OV lockout prevents latch-up during 24V bus surges. |
| Telecom Remote Radio Unit (RRU) | Test Equipment Auxiliary Supply |
Use Scenario: Provides 3.3V/1A bias for RF front-end ICs in outdoor base station radios where ambient temperature reaches +85°C. IC Role / Device Role / Timing Role: High-voltage buck converter operating from 48V intermediate bus; synchronized to system clock to suppress conducted EMI into RF bands. Use Value: 3.0MHz max frequency allows use of 2.2µH inductors; 125°C-rated MSOP package ensures reliability without derating. |
Use Scenario: Supplies clean 12V/800mA for analog front-end op-amps in portable oscilloscope channels requiring low noise and fast transient response. IC Role / Device Role / Timing Role: Secondary regulator fed from main 24V supply; configured with external compensation (ITH) for optimized phase margin at 1.5MHz. Use Value: Internal 5V INTVCC rail powers precision error amplifier; 0.6V reference minimizes divider resistor thermal drift impact on output accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRNXTQ1 | 4.5V–65V input, 1A, 500kHz–2.2MHz, no integrated low-side FET (requires external diode/sync FET) | Requires external synchronous rectification; lacks Burst Mode - higher IQ (26µA sleep, but no true zero-load sleep) | Choose for ultra-wide VIN (65V) or AEC-Q100 Grade 1 automotive qualification; avoid if lowest IQ or integrated sync is required. |
| TPS54240DGQR | 3.5V–40V input, 2.5A, 100kHz–2.5MHz, no integrated low-side FET, 75µA IQ in Eco-mode | Eco-mode approximates light-load efficiency but lacks true discontinuous conduction control; no PGOOD or VON pin | Choose for higher current (2.5A) or lower cost; avoid when precise light-load regulation, PGOOD monitoring, or high step-down ratio stability is needed. |
Compared with LM5164QWRNXTQ1 and TPS54240DGQR, the LTC3646IMSE#TRPBF delivers superior light-load efficiency via true Burst Mode, eliminates external sync FET requirement, and provides dedicated VON and PGOOD pins for high-ratio and safety-critical designs - making it optimal for automotive and industrial applications demanding low IQ, robust protection, and design simplicity.
Availability
LTC3646IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, telecom remote radio units, and test equipment auxiliary supplies requiring stable component supply across extended temperature ranges.
Supply support for LTC3646IMSE#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 semiconductors, serving aerospace, automotive, industrial, and communications markets.
The LTC3646IMSE#TRPBF belongs to Linear's monolithic high-voltage buck regulator product line, designed specifically for robust, high-efficiency point-of-load conversion in automotive and industrial environments with wide input transients and strict low-IQ requirements.
FAQ
What is the maximum input voltage rating for the LTC3646IMSE#TRPBF?
The LTC3646IMSE#TRPBF has an absolute maximum PVIN and SVIN rating of 45V, with guaranteed operation up to 40V. Its SVIN overvoltage lockout triggers at 43.5V (typical) with 2.0V hysteresis, providing robust protection against automotive load-dump transients. This rating applies directly to the LTC3646IMSE#TRPBF in its specified –40°C to +125°C operating junction temperature range.
Does the LTC3646IMSE#TRPBF support output voltages below 2.0V?
No - the LTC3646IMSE#TRPBF is the standard variant with a 2.0V to 30V output voltage range. For outputs down to 0.6V, the pin-compatible LTC3646-1 variant (e.g., LTC3646IMSE-1#TRPBF) must be used. The LTC3646IMSE#TRPBF's internal reference and control loop are optimized for ≥2.0V outputs; attempting lower settings violates datasheet specifications and risks regulation instability.
How does the VON pin function in the LTC3646IMSE#TRPBF?
The VON pin in the LTC3646IMSE#TRPBF feeds the output voltage directly into the on-time controller to compute tON = VON/(VIN × fO). When connected to VOUT, it enables constant-frequency operation across wide input-output ratios and prevents overvoltage during startup or light loads. This function is mandatory for stable regulation and is explicitly required in the LTC3646IMSE#TRPBF datasheet for all applications.
Can the LTC3646IMSE#TRPBF be synchronized to an external clock?
Yes - the MODE/SYNC pin of the LTC3646IMSE#TRPBF accepts an external clock signal (0.2MHz–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. An RT resistor must still be connected to set the internal oscillator's target frequency for proper PLL lock behavior.
What thermal performance can be expected from the LTC3646IMSE#TRPBF in a 1A application?
The LTC3646IMSE#TRPBF in its 16-lead MSOP package has a θJA of 38°C/W. At 1A output, 12V input, and 3.3V output (70% efficiency), power dissipation is ~1.4W, resulting in ~53°C junction rise above ambient. With a 25°C ambient and proper PCB copper pour under the exposed PGND pad, junction temperature remains well within the +125°C rating - confirmed by datasheet thermal characterization for the LTC3646IMSE#TRPBF grade.
LTC3646IMSE#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):
- 2V
- Voltage - Output (Max):
- 30V
- 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#TRPBF FAQ
1.How can I place an order for LTC3646IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3646IMSE#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#TRPBF reliable?
The price and inventory of LTC3646IMSE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3646IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3646IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3646IMSE#TRPBF?
LTC3646IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3646IMSE#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#TRPBF?
For technical support, including LTC3646IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3646IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3646IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3646IMSE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3646IMSE#TRPBF?
All LTC3646IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3646IMSE#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3646IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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