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Analog Devices Inc. LT3680EMSE#PBF
- Part No.:
- LT3680EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3680EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,005
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Product details
Overview
LT3680EMSE#PBF from Analog Devices is a 36V, 3.5A monolithic buck switching regulator with adjustable switching frequency (200kHz–2.4MHz), 75µA quiescent current in Burst Mode, integrated 95mΩ NPN switch and boost Schottky diode, and power good flag. It operates across 3.6V–36V input and delivers 0.79V–30V output voltage, targeting automotive battery regulation and industrial supply systems.
For engineers reviewing the LT3680EMSE#PBF datasheet, LT3680EMSE#PBF pinout, LT3680EMSE#PBF application, or LT3680EMSE#PBF equivalent, key selection criteria include its low-IQ light-load efficiency, thermal protection, soft-start via RUN/SS, synchronization capability (250kHz–2MHz), and MSOP-10 package with exposed pad for enhanced thermal performance.
Technical Context
The LT3680EMSE#PBF employs constant-frequency current-mode control with an internal error amplifier (gm = 500 µ℧), VC pin-based peak-current regulation, and frequency foldback during startup/overload. Its bipolar NPN switch is driven by a BOOST pin voltage higher than VIN, enabled by an external diode-capacitor network.
Burst Mode operation reduces input supply current to 75µA at light loads while maintaining <15mVP-P output ripple; bias current can be drawn from VOUT when >3V to further improve efficiency. The device includes a 0.790V precision feedback reference, open-collector PG flag (91% VFB threshold), and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Max Output Current | 3.5A - sustained delivery with internal 95mΩ switch and thermal protection |
| Quiescent Current | 75µA at 12VIN/3.3VOUT in Burst Mode - enables always-on systems with multi-year battery life |
| Switching Frequency | 200kHz to 2.4MHz - programmable via RT resistor; enables tradeoff between inductor size and efficiency |
| Feedback Reference | 0.790V ±10mV - precise setpoint enabling accurate output voltage programming over temperature |
| Power Good Threshold | 91% of regulated VFB (±65mV offset) - provides reliable system power sequencing signal |
| Shutdown Current | <0.5µA - ensures minimal standby drain in battery-critical applications |
Pinout & Package
LT3680EMSE#PBF is housed in a 10-lead plastic MSOP package with exposed pad (Pin 11) soldered to PCB for low thermal resistance (θJA = 45°C/W, θJC = 10°C/W). The exposed pad is electrically GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Connection | Supplies bias current to internal regulator; connects to Schottky diode anode for BOOST charge pump |
| BOOST (Pin 2) | Switch Drive Voltage Source | Provides >VIN voltage to fully saturate internal NPN switch; requires external capacitor/diode |
| SW (Pin 3) | Switch Node Output | Drives inductor and catch diode; high dv/dt node requiring tight layout and ground plane |
| VIN (Pin 4) | Main Power Input | Supplies internal regulator and switch; must be locally bypassed with ≥10µF ceramic capacitor |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = on); RC ramp sets controlled VOUT rise time |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz clock for EMI reduction; must not float |
| PG (Pin 7) | Power Good Flag | Open-collector output active low until VFB reaches 91% of target; valid only when VIN > 3.6V and RUN/SS high |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider for output voltage programming |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC compensation network stabilizes current-mode loop |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (200kHz–2.4MHz) per published table |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external diode, reducing BOM count and PCB area while enabling efficient high-VIN operation |
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple at light loads with 75µA IQ, avoiding audible noise in ceramic-output designs |
| Output Bias Current Sourcing | Draws bias from VOUT when >3V, improving light-load efficiency without external circuitry |
| Synchronizable Switching | Locks to external clock (250kHz–2MHz) to eliminate beat frequencies and simplify EMI filtering |
| Thermally Enhanced MSOP | 10-lead MSOP with exposed pad achieves θJC = 10°C/W, supporting 3.5A continuous operation at 125°C ambient |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rails to stable 3.3V/5V for infotainment ECUs and ADAS sensors under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role: Primary step-down regulator with wide VIN tolerance, thermal protection, and robust start-up under low-VIN transients. Use Value: Eliminates need for external surge protection or pre-regulators; 75µA IQ extends battery life during vehicle sleep mode. |
Use Scenario: Providing isolated 12V/15V rails from 24V/48V factory automation bus to PLC I/O modules and fieldbus transceivers. IC Role / Device Role: High-efficiency point-of-load converter with programmable frequency to avoid noise coupling into sensitive analog signal chains. Use Value: Adjustable fSW enables optimal inductor sizing for space-constrained DIN-rail enclosures; PG flag enables system-level power sequencing. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Converting 9V–36V universal AC/DC adapter outputs to 3.3V for handheld test equipment with multi-day battery backup requirements. IC Role / Device Role: Main DC-DC regulator with ultra-low IQ and soft-start to prevent inrush into large capacitive loads. Use Value: 75µA Burst Mode IQ enables >1-year shelf life on primary lithium batteries; RUN/SS-controlled ramp prevents brownout during wake-up. |
Use Scenario: Replacing linear regulators in 12V wall adapters powering IP cameras and VoIP phones, where heat dissipation and efficiency are critical. IC Role / Device Role: High-current buck converter replacing inefficient 78xx series, operating directly from unregulated rectified AC output. Use Value: 3.5A capability supports dual-port PoE+ devices; integrated BOOST diode simplifies design versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V input, 3.5A, 2MHz sync capability, 2.5µA IQ; uses MOSFET switch instead of bipolar; no integrated boost diode | Superior light-load efficiency and higher max input voltage; requires external bootstrap diode/capacitor | Preferred for ultra-low-IQ battery systems; not drop-in due to different pinout and external BOOST requirement |
| TPS54360DGQR | 60V input, 3.5A, 100kHz–2.5MHz, 145µA IQ; external MOSFET driver; no PG flag or integrated BOOST diode | Higher VIN rating for 48V industrial systems; lacks power good signaling and internal diode | Selected when >36V input or higher thermal margin needed; requires additional components for PG and BOOST functions |
Compared with LT3680EMSE#PBF, LT8610EMSE#PBF offers significantly lower quiescent current but requires external BOOST components, while TPS54360DGQR supports higher input voltage but adds design complexity for PG and bias generation-making LT3680EMSE#PBF optimal for cost-sensitive, thermally constrained 36V applications needing integrated features.
Availability
LT3680EMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and portable product power applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT3680EMSE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3680EMSE#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-voltage, high-current industrial and automotive power conversion with integrated protection and ease of use.
FAQ
What is the maximum input voltage rating for LT3680EMSE#PBF?
The absolute maximum input voltage for LT3680EMSE#PBF is 36V on the VIN pin. During normal regulation, transient spikes up to 36V are acceptable regardless of switching frequency. However, under startup, short-circuit, or overload conditions, the safe maximum input voltage depends on switching frequency and minimum on-time; for example, at 2.4MHz, VIN(MAX) is reduced to ~24V to avoid violating tON(MIN). Always verify against the input voltage range equation in the datasheet for your specific fSW and VOUT.
Does LT3680EMSE#PBF require an external boost diode?
No, LT3680EMSE#PBF integrates the boost Schottky diode internally-pin BD connects directly to the anode of this on-chip diode. An external diode is not required, simplifying layout and reducing component count. However, an external capacitor must still be connected between BOOST and SW pins to form the charge pump that drives the internal bipolar switch.
How does the power good (PG) flag on LT3680EMSE#PBF operate?
The PG pin on LT3680EMSE#PBF is an open-collector output that remains low until the FB pin voltage reaches 91% of its regulated value (i.e., 0.790V × 0.91 ≈ 0.719V). PG becomes valid only when VIN exceeds 3.6V and RUN/SS is asserted high. An external pull-up resistor (typically 10kΩ to 5V) is required; the PG signal enables reliable power sequencing in multi-rail systems using LT3680EMSE#PBF.
Can LT3680EMSE#PBF synchronize to an external clock?
Yes, LT3680EMSE#PBF supports external synchronization via the SYNC pin (Pin 6), accepting clock signals from 250kHz to 2MHz. The SYNC input has defined logic thresholds (0.5V low, 0.7V high) and requires fast edge rates (<1µs rise/fall). This feature allows LT3680EMSE#PBF to align switching edges with other converters in the system, reducing beat frequencies and easing EMI filter design.
What thermal considerations apply to LT3680EMSE#PBF in MSOP package?
LT3680EMSE#PBF in the 10-lead MSOP package (MSE) features an exposed pad (Pin 11) that must be soldered to a PCB thermal pad for effective heat dissipation. With θJA = 45°C/W and θJC = 10°C/W, full 3.5A output requires adequate copper area and vias under the pad. Derating is necessary above 85°C ambient; at 125°C junction, continuous output current drops to ~2.8A. Thermal shutdown activates at ~165°C junction temperature.
LT3680EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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):
- 0.79V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 230kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3680EMSE#PBF FAQ
1.How can I place an order for LT3680EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3680EMSE#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 LT3680EMSE#PBF reliable?
The price and inventory of LT3680EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3680EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3680EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3680EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3680EMSE#PBF?
LT3680EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3680EMSE#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 LT3680EMSE#PBF?
For technical support, including LT3680EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3680EMSE#PBF requirements.
6.How does Aetrix verify that LT3680EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3680EMSE#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 LT3680EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3680EMSE#PBF?
All LT3680EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3680EMSE#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 LT3680EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3680EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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