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Analog Devices Inc. LTC3646EDE-1#TRPBF
- Part No.:
- LTC3646EDE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3646EDE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,299
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Product details
Overview
LTC3646EDE-1#TRPBF from Analog Devices (formerly Linear Technology) is a 40V input, 1A synchronous step-down DC/DC converter in a 14-lead 3mm × 4mm DFN package, featuring ±1% reference accuracy, 0.6V to 15V output voltage range, and selectable Burst Mode® or forced continuous operation. It delivers up to 95% efficiency at full load and maintains regulation with only 140µA quiescent current in Burst Mode - ideal for automotive intermediate bus and industrial point-of-load supplies.
For engineers reviewing the LTC3646EDE-1#TRPBF datasheet, LTC3646EDE-1#TRPBF pinout, LTC3646EDE-1#TRPBF application, or LTC3646EDE-1#TRPBF equivalent, key selection criteria include its 4.0V–40V input range, 200kHz–3.0MHz adjustable switching frequency, internal power FETs, 0.6V feedback reference, and thermal performance in –40°C to +85°C ambient.
Technical Context
The LTC3646EDE-1#TRPBF implements a current-mode, controlled-on-time architecture with valley-current sensing and an internal 0.6V reference. Its on-time calculation tON = VON/(VIN·fO) enables stable operation across wide input-output ratios without overvoltage risk.
It integrates high-side and synchronous low-side MOSFETs (RDS(ON) = 200mΩ/120mΩ at 5.5V), supports external frequency programming via RT resistor or synchronization via MODE/SYNC pin, and includes soft-start (250–500µs), PGOOD monitoring with 7.5% window, and short-circuit protection with 1.2A valley current limit.
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 - enables direct core supply for low-voltage processors and FPGAs. |
| Max Output Current | 1A - guaranteed across temperature with valley-current limiting and thermal shutdown. |
| Quiescent Current | 140µA in Burst Mode - extends battery life in always-on systems like telematics or sensor nodes. |
| Switching Frequency | 200kHz to 3.0MHz - adjustable via RT resistor or external clock; 2.25MHz default when RT = INTVCC. |
| Reference Accuracy | ±1% (0.594V to 0.606V) - ensures tight output regulation under line/load/temperature variation. |
| Package | 14-lead 3mm × 4mm DFN with exposed PGND pad - provides 43°C/W θJA for high-power density layouts. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 15 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| 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 single-point connection. |
| VFB (Pin 2) | Feedback Input | Connects to resistor divider from VOUT; compares against 0.6V reference to regulate output voltage. |
| ITH (Pin 3) | Error Amplifier Output | Loop compensation node; connects to RC network for stability or ties to INTVCC for internal compensation. |
| RT (Pin 4) | Oscillator Programming | Resistor-to-ground sets switching frequency (200kHz–3MHz); floating not allowed. |
| VON (Pin 5) | On-Time Scaling Input | Connected to VOUT to enable constant-frequency operation across wide VIN/VOUT ratios. |
| PGOOD (Pin 6) | Power-Good Status | Open-drain output pulled low if VFB deviates >7.5% from 0.6V; includes 15–30µs filtering. |
| MODE/SYNC (Pin 7) | Operating Mode Control | Ground = forced continuous; INTVCC = Burst Mode; external clock = synchronized forced continuous. |
| PVIN (Pin 8) | Main Power Input | High-voltage supply for top MOSFET; requires ≥10µF low-ESR ceramic decoupling to PGND. |
| SW (Pin 9) | Switch Node | Connects to inductor and boost capacitor; carries high di/dt; layout critical for EMI control. |
| BOOST (Pin 10) | Bootstrap Supply | Generates gate drive voltage for top FET via SW–BOOST capacitor; swing = INTVCC to PVIN + INTVCC. |
| INTVCC (Pin 11) | Internal 5.0V Regulator | Supplies control circuitry; decouple with ≥4.7µF low-ESR cap; disabled when RUN = low. |
| EXTVCC (Pin 12) | External Bias Input | Optional 4.5V–6.0V supply for lower quiescent current; tie to SGND if unused. |
| RUN (Pin 13) | Enable Input | Active-high enable; threshold = 1.21V (typical); hysteresis = 110mV prevents chatter during slow-rising supplies. |
| SVIN (Pin 14) | Signal Supply Input | Must match PVIN voltage to ensure accurate on-time calculation; decouple with ≥1µF low-ESR cap to SGND. |
| PGND (Pin 15) | Power Ground | Exposed thermal pad; mandatory solder connection to PCB ground plane for thermal dissipation and noise control. |
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, even at extreme duty cycles. |
| Integrated Power FETs | 200mΩ/120mΩ RDS(ON) MOSFETs eliminate external switch losses and simplify BOM for compact designs. |
| Programmable Switching Frequency | 200kHz–3.0MHz adjustment via RT resistor allows optimization of inductor size vs. efficiency trade-off. |
| Robust Protection Suite | Includes SVIN/PVIN overvoltage lockout (43.5V trip), short-circuit current limiting (1.2A typ), and thermal shutdown (TJ = 150°C). |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supplies 3.3V/1A to MCU, CAN transceiver, and display controller in vehicle head unit with 9V–16V battery input and cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated intermediate rail; operates in Burst Mode during sleep states to meet ISO 16750 quiescent current requirements. Use Value: 140µA IQ and 40V absolute max rating withstand load-dump transients; integrated FETs reduce board area by >30% vs. controller+external MOSFET solution. |
Use Scenario: Generates 5V/1A from 24V industrial bus for digital I/O isolation, ADC reference, and microcontroller logic in programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load regulator with forced continuous mode selected to minimize output ripple for precision analog circuitry. Use Value: ±1% reference and 0.6V feedback enable <±10mV output tolerance; 40V input range accommodates 24V ±20% bus variation and surge events. |
| Medical Sensor Node | Test Equipment Auxiliary Rail |
Use Scenario: Powers low-noise analog front-end and BLE radio in portable patient monitor using single-cell Li-ion (3.0V–4.2V) boosted to 12V input via external charge pump. IC Role / Device Role / Timing Role: Secondary buck stage stepping 12V down to 1.8V/1A for RF SoC; configured for Burst Mode to extend battery runtime. Use Value: 95% peak efficiency and 140µA IQ maximize usable battery capacity; 0.6V reference simplifies feedback network for tight 1.8V tolerance. |
Use Scenario: Provides clean 12V/1A auxiliary supply in automated test equipment where main 28V rail powers high-current actuators. IC Role / Device Role / Timing Role: Isolated intermediate bus converter; synchronized to system clock via MODE/SYNC pin to reduce beat-frequency EMI. Use Value: External clock sync eliminates variable-frequency noise; 3.0MHz max frequency enables use of 2.2µH inductor for compact, low-profile design. |
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 |
|---|---|---|---|
| LT8610ACDE#TRPBF | 42V input, 3.5A output, 2.2MHz fixed frequency, 2.5µA IQ in Silent Switcher mode | Higher current, lower IQ, but no adjustable frequency or VON-based on-time scaling | Choose LT8610ACDE#TRPBF for ultra-low-noise, higher-current applications where EMI compliance is critical. |
| TPS54240DGQR | 40V input, 2.5A output, 100kHz–2.5MHz adjustable frequency, 145µA IQ, no integrated bottom FET | Requires external low-side MOSFET; lacks Burst Mode; wider temp range (–40°C to 150°C) | Choose TPS54240DGQR when higher output current and extended temperature operation are required, and external FET layout is acceptable. |
Compared with LT8610ACDE#TRPBF and TPS54240DGQR, the LTC3646EDE-1#TRPBF offers unique VON-based on-time control for stable wide-ratio conversion, integrated synchronous FETs for minimal BOM, and precise 0.6V reference - making it optimal for space-constrained, medium-current applications demanding high accuracy and low standby power.
Availability
LTC3646EDE-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 long lifecycle support.
Supply support for LTC3646EDE-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 aerospace, industrial, automotive, and communications markets.
The LTC3646 family was designed as a monolithic, high-input-voltage synchronous buck regulator targeting space-constrained, high-reliability applications needing wide VIN range, low IQ, and robust protection - especially where discrete FET solutions add cost and complexity.
FAQ
What is the maximum input voltage rating for the LTC3646EDE-1#TRPBF?
The LTC3646EDE-1#TRPBF has an absolute maximum input voltage rating of 45V on PVIN and SVIN pins, with recommended operating range from 4.0V to 40V. Its overvoltage lockout triggers at 43.5V (typical) with 2.0V hysteresis, protecting internal FETs during load-dump transients common in automotive environments.
How does the LTC3646EDE-1#TRPBF achieve high step-down ratios without output overvoltage risk?
The LTC3646EDE-1#TRPBF uses a patented controlled on-time architecture where tON = VON/(VIN·fO). Since VON is tied to VOUT, on-time scales inversely with input voltage - preventing excessive duty cycle and output overvoltage even at VIN = 40V and VOUT = 0.6V.
Can the LTC3646EDE-1#TRPBF operate with an external clock signal?
Yes - the LTC3646EDE-1#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven with a 200kHz–3.0MHz square wave, it locks its switching frequency to the external source and operates in forced continuous mode, reducing EMI beat frequencies in noise-sensitive systems.
What is the purpose of the VON pin on the LTC3646EDE-1#TRPBF?
The VON pin on the LTC3646EDE-1#TRPBF feeds the output voltage into the on-time controller, enabling the device to maintain constant switching frequency across wide input-output voltage ratios. Connecting VON directly to VOUT ensures tON adjusts proportionally to maintain regulation stability.
Does the LTC3646EDE-1#TRPBF require external compensation components?
No - the LTC3646EDE-1#TRPBF supports internal compensation by tying the ITH pin to INTVCC. For optimized transient response or specific stability margins, external Type II or III compensation networks can be connected to ITH, with design guidance provided in the datasheet's Applications Information section.
LTC3646EDE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LTC3646EDE-1#TRPBF FAQ
1.How can I place an order for LTC3646EDE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3646EDE-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 LTC3646EDE-1#TRPBF reliable?
The price and inventory of LTC3646EDE-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 LTC3646EDE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3646EDE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3646EDE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3646EDE-1#TRPBF?
LTC3646EDE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3646EDE-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 LTC3646EDE-1#TRPBF?
For technical support, including LTC3646EDE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3646EDE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3646EDE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3646EDE-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 LTC3646EDE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3646EDE-1#TRPBF?
All LTC3646EDE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3646EDE-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 LTC3646EDE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3646EDE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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