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Analog Devices Inc. LT3682IDD#TRPBF
- Part No.:
- LT3682IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3682IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,324
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Product details
Overview
LT3682IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1A, adjustable-frequency (250kHz–2.2MHz) monolithic buck switching regulator supporting 3.6V–36V input and delivering 0.8V–20V output. It integrates a 0.5Ω bipolar NPN switch, boost diode, current-mode control, soft-start, power-good flag, and overvoltage lockout up to 60V transients-designed for automotive battery regulation and industrial supplies requiring high efficiency at light loads.
For engineers reviewing the LT3682IDD#TRPBF datasheet, LT3682IDD#TRPBF pinout, LT3682IDD#TRPBF application, or LT3682IDD#TRPBF equivalent, key selection criteria include its Low Ripple Burst Mode operation (75μA IQ, <15mVP-P ripple), SYNC-controlled mode selection, thermal shutdown, short-circuit protection via DA-pin sensing, and 12-pin 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LT3682IDD#TRPBF employs constant-frequency current-mode PWM control with slope compensation, enabling fast transient response and stable loop behavior across wide duty cycles. Its oscillator frequency is set externally via RT-to-ground resistor and synchronizable from 300kHz to 2.2MHz using the SYNC pin.
Operation combines dual bias paths (VIN or BD pin), active VC-clamp current limiting, frequency foldback during startup/overload, and catch-diode current monitoring via the DA pin to enforce inductor current safety limits. Power-good signaling occurs when FB reaches 90% of 0.8V reference, with hysteresis of 12mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V nonrepetitive transients-enables direct connection to 24V/36V automotive and industrial rails. |
| Output Current | 1A maximum; current limit varies with duty cycle and SYNC state (1.45A min at low DC with SYNC grounded). |
| Feedback Reference | 0.8V ±12mV over temp-supports precise output programming from 0.8V to 20V using standard resistor dividers. |
| Quiescent Current | 75μA in Low Ripple Burst Mode (12VIN→3.3VOUT)-maintains high efficiency at microamp load levels. |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor; synchronizable to external clock-allows EMI optimization and inductor size reduction. |
| Output Ripple | <15mVP-P in Burst Mode-meets low-noise requirements for sensitive analog or RF circuitry without added filtering. |
| Thermal Protection | Internal thermal shutdown with automatic recovery-prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
The LT3682IDD#TRPBF is housed in a thermally enhanced 12-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 13), which must be soldered to PGND on the PCB for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output | Controls peak switch current; requires RC compensation network to ground for loop stability. |
| FB (Pin 2) | Feedback input | Regulated to 0.8V; connects to resistor divider tap for output voltage setting. |
| PG (Pin 3) | Power good open-collector output | Asserts low until VOUT reaches 90% of target; requires external pull-up for system monitoring. |
| GND (Pin 4) | Analog ground reference | Reference for internal circuitry; must connect to local ground plane with low impedance. |
| BD (Pin 5) | Bias diode anode | Connects to boost Schottky anode; supplies bias current to internal regulator-improves efficiency when powered from VOUT. |
| BOOST (Pin 6) | Boost capacitor node | Drives internal switch gate above VIN via external 0.22μF capacitor to SW-ensures full saturation of bipolar NPN switch. |
| DA (Pin 7) | Catch diode current sense | Monitors external catch diode current to trigger frequency foldback and protect against inductor overcurrent. |
| SW (Pin 8) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor-carries high di/dt switching current. |
| RUN/SS (Pin 9) | Enable & soft-start control | Shuts down device when <0.2V; ramps output voltage via external R-C network when pulled high. |
| RT (Pin 10) | Oscillator frequency set | Resistor to ground programs switching frequency from 250kHz to 2.2MHz per published table. |
| SYNC (Pin 11) | External clock input | Selects operating mode: grounded = Burst Mode; ≥0.8V = pulse-skipping; clock signal = synchronization. |
| VIN (Pin 12) | Main power input | Supplies internal regulator and switch; requires local ceramic bypass capacitor near pin. |
| Exposed Pad (Pin 13) | Power ground (PGND) | Must be soldered to PCB thermal pad-serves as return path for catch diode current and lowers thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode | Maintains 75μA quiescent current and <15mVP-P output ripple at light loads-eliminates need for secondary LDO in always-on systems. |
| Overvoltage Lockout | Disables switching above 39V typical (36V min), safely tolerating 60V transients-protects downstream circuitry in automotive cold-crank or load-dump events. |
| Integrated Boost Diode | On-chip Schottky diode powers internal regulator from BD pin-enables higher efficiency when BD is tied to regulated output instead of VIN. |
| DA-Pin Current Sensing | Detects catch diode current to enforce 1.6A nominal valley-current limit-prevents inductor saturation and enables robust short-circuit recovery. |
| Programmable Soft-Start | Controlled voltage ramp on RUN/SS pin via external R-C-limits inrush current and prevents output overshoot during power-up. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rail to 3.3V or 5V for infotainment ECUs under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary step-down regulator with overvoltage lockout, burst-mode efficiency, and power-good signaling for MCU reset sequencing. Use Value: Eliminates need for external TVS and pre-regulator stages while maintaining <15mVP-P ripple for noise-sensitive audio codecs. | Use Scenario: Providing isolated 12V-to-5V conversion for PLC I/O modules operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability buck controller with thermal shutdown, short-circuit protection, and 125°C junction-rated operation. Use Value: Delivers 1A continuous output with no derating up to 125°C ambient-reduces need for forced air cooling in enclosed enclosures. |
| Portable Product Power | Wide-Input Industrial Supply |
Use Scenario: Powering FPGA core voltage (1.2V) and I/O banks (3.3V) from a single Li+ battery pack (3.0–4.2V) or USB PD source (5–20V). IC Role / Device Role / Timing Role: Adjustable-output buck regulator with programmable frequency and soft-start-enables dynamic voltage scaling and inrush control. Use Value: Achieves >85% efficiency at 100mA load in Burst Mode, extending battery runtime without compromising transient response. | Use Scenario: Converting unregulated 24–36V DC from industrial power supplies to stable 5V/3.3V for sensor nodes and wireless gateways. IC Role / Device Role / Timing Role: Input-transient-hardened buck converter with frequency synchronization capability to avoid beat frequencies in multi-rail systems. Use Value: SYNC pin allows alignment with master clock-reducing conducted EMI in dense PCB layouts with multiple switching regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 42V max input, 1.5A output, integrated MOSFETs, no boost diode, fixed 500kHz/1MHz options | Higher current, lower IQ (25μA), but lacks SYNC and Burst Mode ripple control | Choose LTC3631 for higher output current and ultra-low IQ where <15mVP-P ripple is not required. |
| MP2451DT-LF-Z | 36V max input, 0.6A output, 2.2MHz fixed frequency, no PG or soft-start, smaller 8-pin SOIC | Lower cost, smaller footprint, but no power-good flag, no Burst Mode, limited thermal performance | Choose MP2451 for space-constrained, cost-sensitive designs accepting reduced protection and monitoring features. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT3682IDD#TRPBF uniquely balances 1A output, 60V transient tolerance, Low Ripple Burst Mode, and comprehensive fault protection-making it optimal for automotive and industrial applications demanding both reliability and low-noise operation.
Availability
LT3682IDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable product power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3682IDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3682 belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for ruggedized power conversion in automotive, industrial, and avionics systems where input transients, thermal stress, and low-noise operation are critical.
FAQ
What is the minimum input voltage required for LT3682IDD#TRPBF to start switching?
The LT3682IDD#TRPBF requires a minimum input voltage of approximately 3.6V to operate continuously, determined by its internal bias circuitry and BD pin voltage threshold. Below this, the device cannot sustain regulation-even if RUN/SS is asserted-because the internal regulator fails to power up. Startup may occur at slightly lower voltages during transient conditions, but reliable operation begins at 3.6V.
How does the SYNC pin affect maximum output current in LT3682IDD#TRPBF?
The SYNC pin directly modulates the LT3682IDD#TRPBF's current limit: when grounded, switch current limit is ≥1.45A at low duty cycles; when tied to ≥0.8V or an external clock, it drops to ≥1.18A. This trade-off enables lower ripple in Burst Mode (SYNC grounded) versus better EMI control in synchronized PWM (SYNC active), with corresponding impact on achievable output current under heavy load.
Can LT3682IDD#TRPBF be used without an external catch diode?
No-the LT3682IDD#TRPBF requires an external Schottky catch diode connected between DA (Pin 7) and GND (or PGND). The DA pin senses current through this diode to enable frequency foldback and short-circuit protection. Omitting the diode disables critical fault protection and risks inductor saturation and thermal runaway during overload.
What is the purpose of the BD pin on LT3682IDD#TRPBF, and how should it be connected?
On the LT3682IDD#TRPBF, the BD pin connects to the anode of the external boost Schottky diode and supplies bias current to the internal regulator. When tied to the regulated output (e.g., 5V), it improves efficiency by reducing VIN current draw. If unused, it must be left floating-never tied directly to VIN or GND-as improper connection disrupts internal biasing and may cause startup failure.
Does LT3682IDD#TRPBF support adjustable output voltage, and what is the lowest achievable value?
Yes-the LT3682IDD#TRPBF supports adjustable output voltage from 0.8V to 20V using a resistor divider from VOUT to FB (Pin 2). The 0.8V feedback reference is trimmed to ±1.5% over temperature, enabling accurate low-voltage outputs such as 1.2V for FPGA cores or 1.8V for memory interfaces-provided external resistors are 1% tolerance and layout minimizes FB node leakage.
LT3682IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 1A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3682IDD#TRPBF FAQ
1.How can I place an order for LT3682IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3682IDD#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 LT3682IDD#TRPBF reliable?
The price and inventory of LT3682IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3682IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3682IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3682IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3682IDD#TRPBF?
LT3682IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3682IDD#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 LT3682IDD#TRPBF?
For technical support, including LT3682IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3682IDD#TRPBF requirements.
6.How does Aetrix verify that LT3682IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3682IDD#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 LT3682IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3682IDD#TRPBF?
All LT3682IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3682IDD#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 LT3682IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3682IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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