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Analog Devices Inc. LT3680HMSE#PBF
- Part No.:
- LT3680HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3680HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,933
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Product details
Overview
LT3680HMSE#PBF from Analog Devices is a 36V, 3.5A monolithic buck switching regulator with adjustable 200kHz–2.4MHz switching frequency, 75µA quiescent current in Burst Mode, and integrated 95mΩ NPN switch and boost Schottky diode. It delivers regulated DC power in automotive battery regulation, industrial supplies, and portable product power systems.
For engineers reviewing the LT3680HMSE#PBF datasheet, LT3680HMSE#PBF pinout, LT3680HMSE#PBF application, or LT3680HMSE#PBF equivalent, this page provides verified thermal grade (–40°C to 150°C), soft-start capability via RUN/SS, power good flag, and low-ripple (<15mVP-P) light-load operation - all critical for high-reliability embedded power design.
Technical Context
The LT3680HMSE#PBF implements constant-frequency current-mode control with RT-programmable oscillator (200kHz–2.4MHz), internal error amplifier (500µMho gm), and VC-pin-based peak-current loop compensation. Its bipolar NPN switch uses BOOST-pin-driven gate drive for full saturation at high input voltages.
It features frequency foldback during startup/overload, active VC clamp for current limiting, and bias sourcing from BD pin when VOUT > 3V to reduce VIN quiescent draw. Power Good asserts at 91% of FB-set output voltage with 65mV threshold offset and 10mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Max Output Current | 3.5A - sustained delivery with thermal derating up to 150°C junction temperature. |
| Quiescent Current | 75µA at 12VIN→3.3VOUT in Burst Mode - enables multi-year battery life in always-on portable systems. |
| Switch On-Resistance | 95mΩ - minimizes conduction loss and thermal rise under full load at high duty cycles. |
| Feedback Reference | 0.790V ±15mV - precise setpoint enabling accurate output regulation from 0.79V to 30V via resistor divider. |
| Power Good Threshold | 91% of programmed VOUT - provides reliable system enable signaling with 10mV hysteresis to prevent chatter. |
| Thermal Rating | –40°C to 150°C (H-grade) - qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT3680HMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package with exposed pad (Pin 11) soldered to PCB for low θJC = 10°C/W. Package dimensions: 3mm × 3mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Interface | Connects to Schottky diode anode; supplies bias current to internal regulator when VOUT > 3V - improves light-load efficiency. |
| BOOST (Pin 2) | Switch Gate Drive Boost Supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external capacitor/diode network. |
| SW (Pin 3) | Switch Node Output | Drives inductor and catch diode; carries high di/dt switching current - requires tight layout and ground plane coupling. |
| VIN (Pin 4) | Main Input Power Supply | Supplies internal regulator and switch driver; must be locally bypassed with ≥10µF X7R ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≥2.5V for operation; tie RC network to generate controlled VOUT ramp - prevents inrush and overshoot. |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz external clock for EMI reduction; grounded for Burst Mode operation. |
| PG (Pin 7) | Open-Collector Power Good | Sinks current when VOUT < 91% of target; requires external pull-up for system sequencing or fault indication. |
| FB (Pin 8) | Feedback Voltage Sense | Regulated to 0.790V; connects to resistor divider tap - sets output voltage with ±1.9% accuracy over temp. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC compensation network here stabilizes current-mode loop without ESR dependency. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (200kHz–2.4MHz); enables tradeoff between size, efficiency, and dropout. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75µA from VIN - eliminates need for secondary LDO in standby. |
| Integrated Boost Diode | On-die Schottky reduces BOM count and layout area; reverse leakage <2µA at 10V - preserves efficiency at high ambient temperatures. |
| Thermally Enhanced H-Grade | Rated for –40°C to 150°C junction operation - validated for automotive engine bay and industrial motor drive applications. |
| Soft-Start with RUN/SS | RC-controlled voltage ramp on RUN/SS pin limits inrush current and prevents output overshoot during power-up sequences. |
| Power Good Flag | Open-collector PG output signals stable regulation at 91% of target VOUT - enables safe processor reset and peripheral enable timing. |
| Frequency Synchronization | SYNC pin accepts external clock (250kHz–2MHz) to align switching edges - reduces conducted EMI in multi-rail systems. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment MCU, CAN transceivers, and sensor hubs under cold-crank (4.5V) and load-dump (40V transient) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC supply with thermal robustness and power-good sequencing. Use Value: H-grade 150°C rating ensures reliability during prolonged under-hood operation; 36V absolute max VIN withstands ISO 7637-2 pulse 5a transients. |
Use Scenario: Local point-of-load conversion in PLC I/O modules, where 24V field bus powers isolated 5V logic rails and 3.3V FPGA cores across multiple slots. IC Role / Device Role / Timing Role: High-efficiency, thermally resilient step-down regulator delivering stable output despite ambient temperatures up to 85°C and variable load profiles. Use Value: 75µA Burst Mode IQ extends uptime in low-power monitoring states; SYNC pin enables synchronized switching across multiple LT3680HMSE#PBF units to suppress beat frequencies. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Powering handheld medical devices (e.g., ultrasound probes) from dual-cell Li-ion (6V–8.4V) with strict battery-life requirements and minimal heat dissipation. IC Role / Device Role / Timing Role: Main system regulator managing dynamic load steps from 10mA sleep to 3.5A imaging burst mode. Use Value: BD-pin bias sourcing from VOUT >3V reduces VIN supply current by >50% at light loads - directly extending battery runtime. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters supplying 5V/3A to USB-C PD accessories, where efficiency and thermal management are critical. IC Role / Device Role / Timing Role: High-current buck controller converting rectified 9V–12V DC to tightly regulated 5V with minimal heatsink requirement. Use Value: 95mΩ switch RDS(on) and integrated boost diode achieve >92% efficiency at 2A, reducing adapter surface temperature by >15°C vs. legacy solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3680EMSE#PBF | E-grade (–40°C to 125°C) MSOP variant; identical electrical specs and pinout. | Not rated for continuous operation above 125°C ambient - unsuitable for under-hood or enclosed industrial enclosures. | Select when thermal margin exceeds 25°C and cost sensitivity favors standard grade. |
| LT3680IMSE#PBF | I-grade (–40°C to 125°C) MSOP variant; same performance but different temperature screening and traceability. | Qualified for extended industrial temperature range but lacks H-grade validation for automotive AEC-Q100 stress testing. | Prefer for non-automotive industrial designs requiring tighter parametric binning than E-grade. |
Compared with LT3680EMSE#PBF and LT3680IMSE#PBF, the LT3680HMSE#PBF uniquely supports continuous operation up to 150°C junction temperature - making it the only choice for high-ambient automotive and industrial applications where thermal headroom is constrained.
Availability
LT3680HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable product power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3680HMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT3680HMSE#PBF belongs to Analog Devices' Power by Linear™ buck regulator family, engineered for high-voltage, high-current DC/DC conversion in thermally demanding environments with minimal external components.
FAQ
What is the maximum operating junction temperature for LT3680HMSE#PBF?
The LT3680HMSE#PBF is specified for continuous operation from –40°C to 150°C junction temperature. This H-grade rating is validated per Analog Devices' internal qualification standards and enables use in under-hood automotive and high-ambient industrial applications where standard E- or I-grade parts would thermally throttle or fail.
Does LT3680HMSE#PBF require an external catch diode?
No, the LT3680HMSE#PBF integrates a boost Schottky diode and does not require an external catch diode. The BD pin connects to the anode of the internal diode, and the BOOST pin drives the switch using the generated boosted voltage - eliminating one external component and simplifying layout.
How does the LT3680HMSE#PBF achieve 75µA quiescent current?
The LT3680HMSE#PBF achieves 75µA quiescent current through Low Ripple Burst Mode operation: during light loads, it disables switching circuitry between bursts while maintaining regulation, and draws bias current from the BD pin when VOUT exceeds 3V - reducing VIN supply current significantly.
Can LT3680HMSE#PBF synchronize to an external clock?
Yes, the LT3680HMSE#PBF supports external clock synchronization via the SYNC pin, accepting TTL/CMOS-compatible signals from 250kHz to 2MHz. This allows EMI reduction through frequency alignment in multi-rail systems and eliminates beat frequencies between independent converters.
What is the purpose of the exposed pad on the LT3680HMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3680HMSE#PBF MSOP package is electrically and thermally connected to GND. It must be soldered to a PCB thermal pad to achieve θJC = 10°C/W - essential for dissipating heat at full 3.5A load and maintaining safe junction temperature in high-ambient environments.
LT3680HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3680HMSE#PBF FAQ
1.How can I place an order for LT3680HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3680HMSE#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 LT3680HMSE#PBF reliable?
The price and inventory of LT3680HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3680HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3680HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3680HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3680HMSE#PBF?
LT3680HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3680HMSE#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 LT3680HMSE#PBF?
For technical support, including LT3680HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3680HMSE#PBF requirements.
6.How does Aetrix verify that LT3680HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3680HMSE#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 LT3680HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3680HMSE#PBF?
All LT3680HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3680HMSE#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 LT3680HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3680HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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