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Analog Devices Inc. LT3682IDD#PBF
- Part No.:
- LT3682IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3682IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LT3682IDD#PBF from Analog Devices (formerly Linear Technology) is a 1A monolithic step-down switching regulator with adjustable frequency (250kHz–2.2MHz), 3.6V–36V input range, and 0.8V–20V programmable output voltage. 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.
For engineers reviewing the LT3682IDD#PBF datasheet, LT3682IDD#PBF pinout, LT3682IDD#PBF application, or LT3682IDD#PBF equivalent, key selection criteria include its Low Ripple Burst Mode operation (75μA IQ, <15mV 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#PBF uses constant-frequency current-mode control with slope compensation, enabling fast transient response and stable loop behavior across wide duty cycles. Its oscillator is resistor-programmable (RT pin) and synchronizable (SYNC pin) between 300kHz and 2.2MHz, supporting both PWM and Low Ripple Burst Mode based on external logic level or clock signal.
Protection includes VIN overvoltage lockout (36V continuous / 60V transient), thermal shutdown, frequency foldback during overload, and dual-current-limit architecture: internal switch current limit (1.45A min at low duty cycle, reduced with duty cycle) plus DA-pin–monitored catch diode current limiting (≥1.6A nominal), ensuring robustness in short-circuit and startup conditions.
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 continuous-supports mid-power point-of-load conversion without external pass devices. |
| Switching Frequency | 250kHz to 2.2MHz, set by RT resistor-allows optimization of inductor size (e.g., 10μH at 800kHz) vs. efficiency and EMI. |
| Feedback Reference | 0.8V ±12mV over temperature-enables 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 light-load efficiency while holding output ripple below 15mVP-P. |
| Power Good Threshold | 90% of programmed VOUT with 12mV hysteresis-provides reliable system sequencing and fault detection without external comparators. |
| Package Thermal Resistance | θJA = 43°C/W (12-lead 3mm × 3mm DFN with exposed PGND pad)-supports 1A operation at ≤125°C junction temperature with minimal PCB copper. |
Pinout & Package
LT3682IDD#PBF is housed in a thermally enhanced 12-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 13), which must be soldered to PGND for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (12) | Main power input | Supplies bias and switch current; rated to 60V transient; requires local ceramic bypassing. |
| SW (8) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current. |
| BOOST (6) | Bootstrap drive | Provides >VIN voltage to fully saturate internal NPN switch; requires 0.22μF capacitor to SW. |
| BD (5) | Bias diode anode | Accepts external bias source (>3V) to improve efficiency; also powers internal regulator when VBD > 3V. |
| DA (7) | Catch diode current sense | Monitors valley current in external Schottky diode to trigger frequency foldback and overload protection. |
| FB (2) | Feedback input | Regulated to 0.8V; connects to resistor divider tap for output voltage programming. |
| PG (3) | Power good open-collector | Sinks current when VOUT reaches 90% of target; requires external pull-up for system monitoring. |
| RUN/SS (9) | Enable & soft-start control | Shuts down device when <0.2V; enables operation ≥2.5V; RC network here sets output voltage ramp rate. |
| RT (10) | Frequency setting | Resistor to GND programs switching frequency from 250kHz to 2.2MHz per published table. |
| SYNC (11) | Mode control & synchronization | GND = Low Ripple Burst Mode; ≥0.8V = pulse-skipping; external clock = synchronized operation. |
| VC (1) | Error amplifier output | Controls peak switch current; RC compensation network required for loop stability. |
| GND (4) | Analog ground | Reference for internal circuitry; separate from PGND but tied to it on PCB via low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode | Maintains 75μA quiescent current and <15mVP-P output ripple at light loads-eliminates need for external LDO post-regulation in battery-powered systems. |
| Overvoltage Lockout | Disables switching above 39V typical (36V min) VIN-protects downstream circuitry during load dump without external TVS. |
| Integrated Boost Diode | On-chip Schottky diode supplies BD pin-reduces BOM count and PCB area versus discrete bootstrap solutions. |
| DA-Pin Current Sensing | Detects catch diode current to enforce frequency foldback before inductor saturation-prevents destructive peak currents during short-circuit events. |
| Thermally Enhanced DFN | 3mm × 3mm footprint with exposed PGND pad (θJA = 43°C/W)-delivers full 1A output in compact space without heatsink or airflow. |
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 buck converter with overvoltage lockout, soft-start, and power good signaling for microcontroller reset coordination. Use Value: Eliminates need for external TVS and pre-regulator stages; maintains regulation through 3.6V–36V input range and survives 60V transients. |
Use Scenario: Generating stable 12V or 15V from unregulated 24V/48V factory bus for PLC I/O modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with thermal shutdown, short-circuit protection, and SYNC pin for EMI reduction in noise-sensitive environments. Use Value: Delivers full 1A output with <43°C/W thermal resistance and no derating up to 125°C junction temperature. |
| Portable Product Power | Distributed Supply Regulation |
Use Scenario: Powering FPGA core voltage (1.2V) and I/O banks (3.3V) from single-cell Li-ion (3.0–4.2V) or two-cell pack (6–8.4V) in handheld test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with Low Ripple Burst Mode for ultra-low standby power and clean sleep-state supply. Use Value: Achieves 75μA IQ and <15mV ripple at 1mA load-extends battery life while meeting FPGA VCCIO noise requirements. |
Use Scenario: Local point-of-load conversion on dense server backplanes where 12V intermediate bus must be stepped down to 0.8V–5V for ASICs, memory, and PHYs. IC Role / Device Role / Timing Role: Synchronizable buck controller enabling phase-aligned switching across multiple rails to minimize input capacitance and system-level EMI. Use Value: SYNC pin accepts external clock up to 2.2MHz-allows coordinated switching across multiple LT3682IDD#PBF units to suppress beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8#PBF | 42V input, 2.5A, Silent Switcher architecture, 2.2μA IQ in Burst Mode, integrated MOSFETs | Superior EMI performance and higher current; requires larger layout due to dual-exposed-pad package | Choose for noise-sensitive applications (e.g., RF modules) where EMI compliance is critical and 2.5A output is needed. |
| TPS54202DRCT | 28V input, 2A, 2.5μA shutdown IQ, integrated FETs, 500kHz–2.5MHz sync range, no BD pin | Lacks BD pin for external bias and overvoltage lockout beyond 28V; lower max input voltage limits automotive use | Choose for cost-sensitive industrial supplies with ≤28V input and where external bias optimization is unnecessary. |
Compared with LT8609SIS8#PBF and TPS54202DRCT, the LT3682IDD#PBF uniquely combines 36V continuous input, 60V transient tolerance, BD-pin–enabled efficiency boost, and 12-pin DFN thermal performance-making it optimal for ruggedized 24V/36V systems requiring reliability over raw current or EMI specs.
Availability
LT3682IDD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade authenticity.
Supply support for LT3682IDD#PBF 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 technical and manufacturing continuity for all Linear power products, including rigorous AEC-Q100 stress testing for automotive-grade variants.
The LT3682IDD#PBF belongs to Linear's micropower buck regulator family, engineered specifically for high-input-voltage industrial and automotive applications demanding robust transient immunity, low-light-load IQ, and integrated protection without external components.
FAQ
What is the maximum input voltage the LT3682IDD#PBF can handle continuously and during transients?
The LT3682IDD#PBF operates continuously from 3.6V to 36V input. Its absolute maximum rating allows nonrepetitive 1-second transients up to 60V at VIN and RUN/SS pins. During transients exceeding 39V (typical overvoltage lockout threshold), the LT3682IDD#PBF disables switching to protect itself and downstream circuitry while sustaining the overvoltage safely.
How does the LT3682IDD#PBF achieve low output ripple in Burst Mode?
The LT3682IDD#PBF uses proprietary Low Ripple Burst Mode operation that minimizes output voltage deviation during burst cycles. In this mode, the LT3682IDD#PBF maintains <15mVP-P ripple at typical loads while drawing only 75μA quiescent current from VIN-achieved through controlled gate drive and optimized internal timing, not external filtering.
Can the LT3682IDD#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LT3682IDD#PBF supports external synchronization via its SYNC pin. When driven by a clean clock signal with rise/fall times <1μs, it locks to frequencies from 300kHz to 2.2MHz. Grounding SYNC selects Low Ripple Burst Mode; applying ≥0.8V enables pulse-skipping mode-giving designers full control over operating mode and EMI profile.
What protection features are built into the LT3682IDD#PBF?
The LT3682IDD#PBF integrates six protection mechanisms: (1) VIN overvoltage lockout (36V continuous / 60V transient), (2) thermal shutdown, (3) internal switch current limiting (1.45A min), (4) DA-pin–based catch diode current sensing for frequency foldback, (5) power good flag with 90% threshold and hysteresis, and (6) minimum on/off time enforcement to prevent instability at extreme duty cycles.
Is the LT3682IDD#PBF pin-compatible with other members of the LT368x family?
No, the LT3682IDD#PBF is not pin-compatible with LT3680 or LT3681. While sharing functional similarities, each variant has distinct pin assignments-for example, the LT3682IDD#PBF places BOOST on Pin 6 and DA on Pin 7, whereas LT3680 uses different pin mapping. Always verify pinout against the specific device's datasheet before board reuse.
LT3682IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3682IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3682IDD#PBF 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#PBF reliable?
The price and inventory of LT3682IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3682IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3682IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3682IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3682IDD#PBF?
LT3682IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3682IDD#PBF 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#PBF?
For technical support, including LT3682IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3682IDD#PBF requirements.
6.How does Aetrix verify that LT3682IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3682IDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3682IDD#PBF?
All LT3682IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3682IDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3682IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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