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Analog Devices Inc. LT3682EDD#TRPBF
- Part No.:
- LT3682EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3682EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,155
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Product details
Overview
LT3682EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1A, adjustable-frequency (250kHz–2.2MHz) monolithic buck switching regulator supporting 3.6V to 36V input and delivering 0.8V to 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 transient-designed for automotive battery regulation and industrial supplies.
For engineers reviewing the LT3682EDD#TRPBF datasheet, LT3682EDD#TRPBF pinout, LT3682EDD#TRPBF application, or LT3682EDD#TRPBF equivalent, key selection considerations include its Low Ripple Burst Mode operation (75μA IQ, <15mVP-P ripple), SYNC-enabled mode selection (Burst vs. PWM), thermal shutdown, frequency foldback, and 12-pin 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LT3682EDD#TRPBF uses current-mode control with slope compensation for stable loop response across wide duty cycles and fast transient recovery. Its oscillator is resistor-programmable (RT pin) and synchronizable (SYNC pin) between 300kHz and 2.2MHz, enabling EMI reduction and multi-rail coordination.
Protection includes cycle-by-cycle switch current limiting (1.45A min, duty-cycle dependent), DA-pin-based catch-diode current sensing for frequency foldback, thermal shutdown, and VIN overvoltage lockout (39V typ, 60V transient tolerant). The VC pin serves as error amplifier output with active clamp for current limit and soft-start coupling via RUN/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients-enables direct connection to 24V/36V automotive or industrial rails. |
| Output Current | 1A maximum continuous; current limit varies with duty cycle (1.45A min at low DC, down to 1.1A at 90% DC when SYNC grounded). |
| Switching Frequency | 250kHz to 2.2MHz, set by RT resistor; supports compact magnetics and EMI optimization via synchronization. |
| Quiescent Current | 75μA in Low Ripple Burst Mode (12VIN→3.3VOUT); enables micropower operation in battery-backed systems. |
| Feedback Reference | 0.8V ±12mV over temp; allows precise output programming from 0.8V to 20V using standard resistor dividers. |
| Power Good Threshold | 90% of regulated VOUT (±12mV hysteresis); open-collector PG signal validates regulation before system enable. |
| Thermal Package | 12-pin 3mm × 3mm DFN with exposed PGND pad (θJA = 43°C/W); supports high-power density layouts with low thermal resistance. |
Pinout & Package
LT3682EDD#TRPBF is housed in a thermally enhanced 12-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 13), which must be soldered to PCB for PGND connection and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (12) | Main power input | Supplies internal regulator and switch; bypass locally; rated to 60V transient. |
| SYNC (11) | External clock interface | Selects operating mode: ground = Burst Mode; ≥0.8V = PWM; external clock = synchronized switching. |
| RT (10) | Oscillator frequency setting | Resistor-to-ground sets switching frequency from 250kHz to 2.2MHz (e.g., 40.2kΩ = 800kHz). |
| RUN/SS (9) | Enable & soft-start control | ≥2.5V enables operation; RC network here provides controlled output voltage ramp during startup. |
| SW (8) | Switch node | Connects to inductor, catch diode anode (via DA), and BOOST capacitor; carries high di/dt switching current. |
| DA (7) | Catch diode current sense | Monitors valley current in external Schottky diode; triggers frequency foldback above ~1.6A to prevent overload. |
| VC (1) | Error amplifier output | Controls peak switch current; clamped to RUN/SS for soft-start; RC compensation required for stability. |
| FB (2) | Feedback input | Regulated to 0.8V; connects to resistor divider tap; bias current flows out (5–80nA). |
| PG (3) | Power good flag | Open-collector output asserts high when VOUT reaches 90% of target; requires external pull-up. |
| GND (4) | Analog ground reference | Ground for internal circuitry; separate from PGND (exposed pad) to minimize noise coupling. |
| BD (5) | Bias diode anode | Connects to boost diode anode; supplies bias current to internal regulator-improves efficiency when tied to VOUT. |
| BOOST (6) | Boost drive node | Capacitor (0.22μF typical) between BOOST and SW generates >VIN voltage to saturate bipolar switch. |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode | Maintains 75μA quiescent current and <15mVP-P output ripple at light loads-ideal for always-on automotive modules. |
| Wide Input Range with OVL | Operates from 3.6V to 36V; shuts down switching above 39V (typ) but survives 60V transients-no external TVS needed for ISO 7637-2 pulses. |
| Synchronizable Switching | Accepts external clock (300kHz–2.2MHz) or logic-level SYNC input to eliminate beat frequencies in multi-regulator systems. |
| Integrated Boost Diode | On-chip Schottky diode supplies bias to internal regulator from BD pin-reduces component count and improves light-load efficiency. |
| Robust Protection Suite | Includes cycle-by-cycle current limit, DA-pin foldback, thermal shutdown, and overvoltage lockout-enables unattended industrial deployment. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
|
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 micropower sleep, and power-good sequencing. Use Value: Eliminates need for external TVS and pre-regulator stages; maintains regulation down to 3.6V input and survives ISO 16750-2 transients. |
Use Scenario: Providing stable 12V or 15V bias for PLC I/O modules in factory automation environments with noisy 24VDC distribution rails. IC Role / Device Role / Timing Role: High-input-voltage buck controller with thermal shutdown and frequency foldback for overload resilience. Use Value: Delivers full 1A output across –40°C to 125°C junction range; exposed pad ensures reliable thermal performance in sealed enclosures. |
| Portable Product Power | Distributed Supply Regulation |
|
Use Scenario: Powering FPGA core or microcontroller subsystems in handheld test equipment powered by Li-ion (3.0–4.2V) or 9V alkaline batteries. IC Role / Device Role / Timing Role: Adjustable-output buck converter with soft-start and low-noise Burst Mode for sensitive analog circuits. Use Value: Achieves >85% efficiency at 10mA load (3.6VIN→1.8VOUT); 15mVP-P ripple avoids interference with ADC references. |
Use Scenario: Local point-of-load conversion in telecom line cards where 48V backplane must be stepped down to 3.3V/5V for ASICs and SerDes. IC Role / Device Role / Timing Role: Synchronizable buck regulator enabling phase-aligned switching across multiple rails to reduce input capacitance. Use Value: SYNC pin allows alignment with master clock-lowers RMS input current ripple by up to 40% versus free-running operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRPBF | 42V input, 2A, Silent Switcher architecture; 2.2MHz fixed freq; lower EMI; no BD pin or integrated boost diode. | Better for noise-sensitive RF/analog systems; lacks BD-driven efficiency boost at light loads. | Choose LT8609S for EMI-critical designs; LT3682EDD#TRPBF preferred when BD-bias efficiency or wider frequency tuning is required. |
| TPS54202DRCT | 6V–36V input, 2A, integrated MOSFETs; 500kHz–2.5MHz sync; no boost diode; 1.2V ref; smaller 10-pin WSON. | Higher current, lower IQ (18μA), but lacks overvoltage lockout >36V and robust 60V transient tolerance. | Choose TPS54202 for cost-sensitive, space-constrained 2A apps; LT3682EDD#TRPBF remains superior for automotive transients and micropower Burst Mode. |
Compared with LT8609SIV#TRPBF and TPS54202DRCT, the LT3682EDD#TRPBF uniquely combines 60V transient survivability, integrated boost diode for BD-bias efficiency, and Low Ripple Burst Mode with sub-15mV ripple-making it optimal for automotive and industrial applications demanding both ruggedness and micropower sleep.
Availability
LT3682EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and distributed supply regulation requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for LT3682EDD#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 precision instrumentation, automotive, and industrial markets.
The LT3682 belongs to Linear's micropower monolithic buck regulator product line, engineered for high-voltage input, low-quiescent-current operation, and robust protection in harsh environments like automotive and factory automation.
FAQ
What is the absolute maximum input voltage rating for LT3682EDD#TRPBF?
The LT3682EDD#TRPBF has an absolute maximum VIN rating of 60V for non-repetitive 1-second transients, and 36V for continuous operation. Its overvoltage lockout activates at ~39V (typical), halting switching to protect downstream circuitry while sustaining the transient-making LT3682EDD#TRPBF suitable for ISO 7637-2 load-dump testing without external clamping.
How does the BD pin improve efficiency in LT3682EDD#TRPBF?
The BD pin on the LT3682EDD#TRPBF connects to the anode of the internal boost Schottky diode and supplies bias current to the IC's internal regulator. When tied to the regulated output (e.g., 5V), it shifts bias sourcing from VIN to VOUT-reducing input current and improving light-load efficiency. This feature is unique to LT3682EDD#TRPBF among comparable buck regulators and directly enables its 75μA quiescent current spec.
Can LT3682EDD#TRPBF operate in forced PWM mode, or is Burst Mode mandatory?
The LT3682EDD#TRPBF supports both modes via the SYNC pin: grounding SYNC enables Low Ripple Burst Mode for micropower operation, while applying ≥0.8V or an external clock forces pulse-skipping (PWM-like) operation. Unlike some competitors, LT3682EDD#TRPBF does not require external components to disable Burst Mode-mode selection is purely pin-controlled and fully documented in the datasheet.
What is the purpose of the DA pin on LT3682EDD#TRPBF, and how does it affect reliability?
The DA pin on LT3682EDD#TRPBF senses current through the external catch diode and triggers frequency foldback when valley current exceeds ~1.6A. This prevents inductor saturation and thermal runaway during short-circuit or startup events-complementing the main switch current limit. It enhances reliability in fault conditions without requiring additional current-sense resistors or controllers, a capability confirmed in LT3682EDD#TRPBF's electrical characteristics table and block diagram.
Is the exposed pad of LT3682EDD#TRPBF electrically connected, and how must it be handled on the PCB?
Yes-the exposed pad (Pin 13) of LT3682EDD#TRPBF is electrically connected to PGND (power ground), not signal GND. It must be soldered to a dedicated thermal pad on the PCB with ≥6 thermal vias to an internal ground plane. Failure to connect it compromises thermal performance (θJA degrades from 43°C/W) and may cause PGND noise coupling into analog sections-both requirements are explicitly specified in the LT3682EDD#TRPBF Absolute Maximum Ratings and Package Description.
LT3682EDD#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)
LT3682EDD#TRPBF FAQ
1.How can I place an order for LT3682EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3682EDD#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 LT3682EDD#TRPBF reliable?
The price and inventory of LT3682EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3682EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3682EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3682EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3682EDD#TRPBF?
LT3682EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3682EDD#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 LT3682EDD#TRPBF?
For technical support, including LT3682EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3682EDD#TRPBF requirements.
6.How does Aetrix verify that LT3682EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3682EDD#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 LT3682EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3682EDD#TRPBF?
All LT3682EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3682EDD#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 LT3682EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3682EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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